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Drug-eluting stent
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<h2 id="design">Design</h2> <p>A drug-eluting stent (DES) is a small mesh tube that is placed in the arteries to keep them open in the treatment of <a href="/facts/Vascular_disease/0ckNa44L">vascular disease</a>. The stent slowly releases a drug to block <a href="/facts/Cell_proliferation/Jp3hWo2t">cell proliferation</a> (a biological process of cell growth and division), thus preventing the arterial narrowing (<a href="/facts/Stenosis/X0x2tAk7">stenosis</a>) that can occur after stent implantation. While such stents can be used in various arteries throughout the body, they are commonly placed in the <a href="/facts/Coronary_arteries/Xsx1dekd">coronary arteries</a> to treat <a href="/facts/Coronary_artery_disease/szCt0nVx">coronary heart disease</a>.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a><a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a><a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a><a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> DES products are integrated medical devices and are part of a <a href="/facts/Percutaneous_coronary_intervention/2zlAdul0">percutaneous coronary intervention</a> (PCI) delivery system.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a><a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a><a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a><a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> </p><p>DES is a medical device with several key properties: it functions as a structural scaffold, physically keeping an artery open to ensure blood flow; the device has specific drug delivery features, and the chosen drug is critical for its effectiveness. The drug, the hallmark compenent of the device, is selected for its suitability in inhibiting <a href="/facts/Restenosis/cKNYGX9z">restenosis</a> and its <a href="/facts/Pharmacokinetics/x4CUUnle">pharmacokinetics</a>. Apart from the drug, the materials used in the fabrication of the device are also essential and are carefully chosen for their <a href="/facts/Biocompatibility/UbGXs4XW">biocompatibility</a> and durability in a biological environment, such as human blood; these materials must also withstand the constant motion of the heart's beat and be suitable for future patient imaging using <a href="/facts/Magnetic_resonance_imaging/Vh9yG9qq">magnetic resonance imaging</a> (MRI) technologies, which employ high <a href="/facts/Magnetic_field/Ta8Ev588">magnetic fields</a>.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a><a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a><a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> </p><p>Other components, such as the catheter design, also play significant roles in the device's overall functionality and effectiveness.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a><a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a><a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a><a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> </p><p>DES are typically composed of metal alloys, most commonly <a href="/facts/Stainless_steel/IDdo8bEx">stainless steel</a> or <a href="/facts/Cobalt-chrome/k0jkxBys">cobalt-chromium</a>, but can also be made of other materials such as platinum-chromium or <a href="/facts/Nickel-titanium_alloy/dWInaJpt">nickel-titanium</a>. The stent is often coated with a <a href="/facts/Polymer/eF32E50K">polymer</a> to control the release of drugs. The role of polymers in drug delivery is significant as they regulate the rate at which the drug is released into the surrounding tissue.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a><a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> There are also polymer-free stents where the drug is directly coated on the stent or contained in reservoirs within the stent.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a><a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a><a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> </p><p>The design of the stent includes <a href="/facts/Strut/49lYbdrE">struts</a>, which are thin wire structures that make up the stent frame. The strut thickness can influence the stent's performance, with thinner struts generally being associated with lower <a href="/facts/Restenosis/cKNYGX9z">restenosis</a> rates and reduced <a href="/facts/Thrombosis/8Y3wh2UX">thrombosis</a> risk.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a><a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> </p><p>Most DES are balloon-expandable, meaning they are mounted on a balloon catheter and expand when the balloon is inflated.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a><a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> There are also self-expanding stents, which automatically expand when deployed. The very first stent, introduced in 1986, was of this type.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a><a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a><a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> </p><p>The stent tube mesh is initially collapsed onto the catheter—in this collapsed state, it is small enough to be passed though relatively narrow arteries and then expanded in its destination place, pushing firmly to the diseased artery wall.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a><a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> </p><p>The pharmaceutical compounds that DES emit are <a href="/facts/Antiproliferative/3FRUk2e2">antiproliferative</a> agents such as <a href="/facts/Sirolimus/9hdLP135">sirolimus</a>, <a href="/facts/Everolimus/nKvnvSD8">everolimus</a>, <a href="/facts/Zotarolimus/ptvQRe5c">zotarolimus</a>, <a href="/facts/Paclitaxel/sGxTE647">paclitaxel</a> and <a href="/facts/Biolimus_A9/CWV7hSMw">biolimus</a>. These drugs help prevent the arterial narrowing that can occur after stent implantation.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a><a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a><a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> These drugs are also used for other purposes, that involve moderating the <a href="/facts/Immune_system/HRCTf1pb">immune system</a> or treating cancer. They work by inhibiting cell growth. In DES, they are used in very small amounts and for a short time, and only in the area where the stent is placed.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> </p><p>There is a distinction between <a href="/facts/Coronary_stent/DnL2WCJV">coronary stents</a> and peripheral stents.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> While both are used to prevent the narrowing of arteries, coronary stents are specifically for the <a href="/facts/Coronary_arteries/Xsx1dekd">coronary arteries</a>, while peripheral stents are for any other arteries in the body.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a><a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a><a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> Peripheral stents are mostly <a href="/facts/Bare-metal_stent/vjRJfGLp">bare metal</a> ones; some peripheral DES, of the self-expanding type, are used in arteries of the legs.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a> </p><p><a href="/facts/Bioresorbable_stent/T0B8VVkp">Bioresorbable</a> DES are made of materials that can be absorbed by the body over time, potentially reducing potential long-term complications associated with permanent stents.<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> </p> <h2 id="uses">Uses</h2> <h3>Atherosclerosis: a general background</h3> <p>Atherosclerosis is a chronic disease that affects the large and medium-sized arteries. It is characterized by the accumulation of calcium, fats (such as cholesterol) and other substances in the innermost layer of the endothelium, a layer of cells that line the interior surface of blood vessels. Atherosclerosis is considered to be the most common form of arteriosclerosis, which refers to the loss of arterial elasticity caused by thickening and stiffening of blood vessels.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> </p><p>Atherosclerosis can begin as early as childhood with the development of small "fatty streaks" within arteries. These streaks are essentially deposits of fat. Over time, these initial lesions grow larger and become thicker, forming atheromas (atherosclerotic plaques).<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> </p><p>Drug-eluting stents (DESs) are used in the treatment of atherosclerosis in both coronary interventions and peripheral arterial interventions:<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> </p> <ul><li>In coronary interventions, DESs are used to treat coronary artery disease, which is primarily caused by atherosclerosis.<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> The stents are inserted into narrowed coronary arteries and then expanded to open up the narrowed artery. The drug compound released by the stents suppresses cellular growth in the newly stented area, reducing the potential for blockage within the stent area itself.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a><a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a><a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></li> <li>In peripheral arterial interventions, DESs have established themselves as the go-to choice for addressing symptomatic peripheral arterial disease (PAD).<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a><a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a><a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a><a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a><a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a> These highly effective stents are deployed in the treatment of peripheral arterial occlusive disease (PAOD), a condition that shares resemblances with coronary artery disease but specifically affects the peripheral arteries.<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> By employing DESs, healthcare professionals can provide optimal care and intervention to manage PAOD, ultimately improving patient outcomes and mitigating associated complications.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a></li></ul> <p>DESs are used in the management of atherosclerosis in both coronary and peripheral arterial interventions.<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> They help improve blood flow and reduce the risk of restenosis, thereby improving patient outcomes. The use of DESs is accompanied by appropriate medical therapy and lifestyle modifications to manage atherosclerosis effectively.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> </p> <h3>Stenosis and restenosis of blood vessels</h3> <p>Stenosis of blood vessels refers to the narrowing of the blood vessels, which can restrict blood flow to the organs and tissues.<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a> This condition is often caused by the buildup of fatty deposits in the arteries, a process also called atherosclerosis.<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a> </p><p>In the context of stents, stenosis is a significant concern. Stents are inserted into a narrowed artery during a procedure known as angioplasty. The stents help to open up the narrowed artery and improve blood flow. However, over time, the treated artery can close up again, a condition known as restenosis.<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> </p><p>Restenosis, or in-stent restenosis, is a blockage or narrowing that comes back in the portion of the artery previously treated with a stent.<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a> Restenosis tends to happen three to six months after the procedure.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a> Restenosis is even more likely to occur if a stent would not have been used.<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a> </p><p>When restenosis occurs, another procedure may be needed to correct the problem, such as the placement of a DES<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a><a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> that gradually release a drug compound that suppresses cellular growth, thereby reducing the potential for blockage within the stent area itself.<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a><a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> This therapy significantly reduces the occurrence of adverse events post-stenting.<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a><a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a> </p><p>Technically, a DES in a mesh tube implant devices that is used in angioplasty procedures to treat stenosis of blood vessels and prevent restinosis: the stent, which elutes drugs, is implanted into the blood vessel to help keep the vessel open and improve blood flow.<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a><a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a><a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> Specifically, drug-eluting stents are used in the treatment of various medical conditions usually at the site of stenotic or occlusive arterial lesions, but one of the primary medical uses is in the treatment of coronary artery disease.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> Stents are inserted into narrowed coronary arteries, where the narrowing is primarily caused by atherosclerosis. Stents are then expanded to open up the narrowed artery. Such stents gradually release a drug compound that suppresses <a href="/facts/Cell_growth/wbArMaJU">cellular growth</a>, into the newly stented area, thereby reducing the potential for blockage within the stent area itself.<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a> Such blockage is termed in-stent restenosis (ISR). This in-stent blockage is most often caused by excessive <a href="/facts/Cell_proliferation/Jp3hWo2t">cell proliferation</a> or <a href="/facts/Thrombus/vH6FDIQG">thrombi</a> (blood clots). <a href="/facts/Anticoagulation_therapy/cARpjm0G">Anticoagulation therapy</a> (blood thinners), has become a standard treatment following the placement of DES. This therapy significantly reduces the occurrence of adverse events post-stenting.<a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a><a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a><a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> </p> <h3>Coronary interventions</h3> <p>DESs have played a transformative role in the management of coronary artery disease. These stents are tiny, flexible mesh tubes employed during percutaneous coronary intervention (PCI) to address narrowed coronary arteries. What sets them apart is their special coating, which incorporates a drug delivery system that enables controlled release of medication over a specific period, typically within the first 30 to 45 days following implantation. This medication aids in inhibiting the formation of scar tissue within the stent and subsequent re-narrowing of the blood vessel.<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a><a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a> </p><p>PCI is a minimally invasive procedure. It involves the placement of a drug-eluting stent (DES) in a coronary artery. This procedure, previously known as <a href="/facts/Angioplasty/j2ausFmb">angioplasty</a> with a stent, is considered non-surgical as it is performed through a small puncture in a peripheral artery, avoiding the need to open the chest wall. While bleeding from the puncture site was once a concern, advancements in PCI practices have mitigated this issue through the use of pressure bands and arterial closure systems. Modern DES/PCI procedures are generally painless, although some mild discomfort may be experienced.<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a><a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a><a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> In PCI, multiple DES are sometimes implanted within a single patient; the decision to use multiple stents is typically contingent on the extent of the coronary artery disease present and the number of diseased coronary arteries that require treatment.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a><a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> </p> <h3>Peripheral arterial interventions</h3> <p>DESs have emerged as the primary therapeutic approach for managing symptomatic peripheral arterial disease (PAD). These specialized stents are now widely utilized in the treatment of peripheral arterial occlusive disease (PAOD), a condition that shares similarities with coronary artery disease but affects the peripheral arteries. By deploying DESs, healthcare professionals can effectively address and alleviate the complications associated with PAOD, enhancing patient outcomes and quality of life.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a><a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a><a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a> The use of DESs in peripheral arterial interventions has shown encouraging results in terms of primary patency (PP) and target lesion <a href="/facts/Revascularization/uv0oykqB">revascularization</a> (TLR) compared with bare-metal stents (BMSs).<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a><a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a><a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a><a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a> </p><p>Different types of DESs are available on the market, each with different concentrations of drugs and showing varying efficacy.<a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a><a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a> Among the different DESs, <a href="/facts/Sirolimus/9hdLP135">sirolimus</a>-eluting stents and <a href="/facts/Everolimus/nKvnvSD8">everolimus</a>-eluting stents were found to be more effective than <a href="/facts/Paclitaxel/sGxTE647">paclitaxel</a>-eluting stents.<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a><a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a> </p> <h3>Clinical indications</h3> <p>PCI and stent placement are considered when someone shows signs of reduced blood flow in the arteries that supply the heart or when tests, such as different types of coronary artery imaging, show a blockage in those arteries.<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a><a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a> </p><p>Symptoms can include: </p> <ul><li>severe, pressure-like <a href="/facts/Chest_pain/QFUzPBsT">chest pain</a> unrelieved by rest;</li> <li>shortness of breath, fatigue, lightheadedness;</li> <li><a href="/facts/Palpitations/2wACMY49">palpitations</a>;</li> <li>atypical symptoms: <a href="/facts/Nausea/dyhkcbeD">nausea</a>, <a href="/facts/Vomiting/R2vQkHqV">vomiting</a>, <a href="/facts/Indigestion/axnCu0gn">indigestion</a>, confusion, back pain.<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a></li></ul> <p>In a medical setting, it's not very useful for doctors to rely solely on what people say about where their pain comes from or how it feels, because the way people describe chest pain caused by reduced blood flow to the heart can vary greatly and may not match what is typically taught in medical education or described in books and articles.<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a><a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a> </p> <h3>Contraindications</h3> <p>DES is not recommended in some cases as it may do more harm than good. DES is not suitable: </p> <ul><li>when individuals have a bleeding tendency;<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a></li> <li>when a coronary artery has no clear and identifiable narrowing;<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a></li> <li>when only one diseased coronary artery supplies oxygenated blood to the heart muscle. During stent placement, there is a short period of blood flow blockage by the balloon inflation. This blockage time is often longer than twenty seconds to allow the DES to expand and embed into the arterial wall. In this case, this time may be too long and cause serious events due to lack of blood to the heart muscle.<a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a></li></ul> <p>Bleeding disorders make DES unsuitable because of the need for anticoagulation drugs (blood thinners) during the procedure and in post-stenting aftercare. Other factors that could rule out the use of stents include a history of in-stent blockage, bleeding problems, complex or unsuitable coronary anatomy, or a short life expectancy due to other serious medical conditions.<a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a> </p> <h3>Risks and complications</h3> <h4>Risks from the procedure</h4> <p>Stent placement risks include bleeding, allergic reactions to the contrast agents used to visualize the coronary arteries, and myocardial infarction. With <a href="/facts/Percutaneous_coronary_intervention/2zlAdul0">percutaneous coronary intervention</a> (PCI), the requirement for emergency <a href="/facts/Coronary_artery_bypass_surgery/DDTF1jaB">coronary artery bypass graft (CABG) surgery</a> has decreased as better practices have been introduced.<a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a> In some situations, coronary stenting is permitted in hospitals without cardiac surgery facilities,<a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a> but such permission remains controversial because of the rare but unpredictable risk of coronary artery perforation.<a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a> </p> <h4>Stent thrombosis risks</h4> <p>A complication of coronary stenting is stent thrombosis (blood clots). This occurs when a new clot forms within the stent and occludes blood flow, causing a heart attack.<a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a><a class="footnote-ref" id="fnref:123" href="#fn:123"><sup>123</sup></a><a class="footnote-ref" id="fnref:124" href="#fn:124"><sup>124</sup></a> </p> <h4>In-stent restenosis risks (ISR)</h4> <p>DES were designed to specifically combat issues of restenosis that occurred with older bare-metal stents (BMS).<a class="footnote-ref" id="fnref:125" href="#fn:125"><sup>125</sup></a><a class="footnote-ref" id="fnref:126" href="#fn:126"><sup>126</sup></a> Though less frequent with drug-eluting stents, restenosis can still occur.<a class="footnote-ref" id="fnref:127" href="#fn:127"><sup>127</sup></a> </p><p>Since the advent of DES technology, the incidence of ISR has significantly decreased.<a class="footnote-ref" id="fnref:128" href="#fn:128"><sup>128</sup></a><a class="footnote-ref" id="fnref:129" href="#fn:129"><sup>129</sup></a> </p> <h3>Usage outside the scope of typical regulatory approval</h3> <p>DES have been shown to be superior to BMS in reducing short-term complications of stenting in <a href="/facts/Great_saphenous_vein/A1AtxFLK">saphenous vein</a> grafts.<a class="footnote-ref" id="fnref:130" href="#fn:130"><sup>130</sup></a> However, the use of DESs in <a href="/facts/Bypass_grafting/DDTF1jaB">bypass grafts</a> was not their originally intended use nor within the scope of originally regulatory approval (<a href="/facts/US_FDA/rCEnh9WB">US FDA</a>, <a href="/facts/European_Medicines_Agency/h9FTtCYc">European Medicines Agency</a>, etc.). The practice of using a medical device or drug in a way not specified in the original or current approved labeling is often referred to as "<a href="/facts/Off-label/0PDs5VWS">off-label</a>" use.<a class="footnote-ref" id="fnref:131" href="#fn:131"><sup>131</sup></a> </p><p>In regions were cardiac stenting has become commonplace, think tanks and advocacy groups express concern about the overzealous use of stents,<a class="footnote-ref" id="fnref:132" href="#fn:132"><sup>132</sup></a> because patients who received stents for unapproved reasons<a class="footnote-ref" id="fnref:133" href="#fn:133"><sup>133</sup></a><a class="footnote-ref" id="fnref:134" href="#fn:134"><sup>134</sup></a> often have worse outcomes compared to patients who received stents for approved uses.<a class="footnote-ref" id="fnref:135" href="#fn:135"><sup>135</sup></a><a class="footnote-ref" id="fnref:136" href="#fn:136"><sup>136</sup></a><a class="footnote-ref" id="fnref:137" href="#fn:137"><sup>137</sup></a> </p> <h2 id="clinical-procedure">Clinical procedure</h2> <h3>DES placement</h3> <p>People who receive a coronary stent have different needs depending on their medical condition. Some patients are actually having a heart attack and need immediate life-saving emergency care. Other patients are at high risk of having a heart attack in the very near future. For people from each of these groups, PCI procedures may vary slightly, with particular modifications as to how they are sedated, pain management, and broader <a href="/facts/Intensive_care_medicine/lbc92jbH">intensive care</a> issues such as breathing support.<a class="footnote-ref" id="fnref:138" href="#fn:138"><sup>138</sup></a> </p><p>Many people who are not in critical care situations are usually fully awake during the PCI procedure and DES placement, but they receive local anesthetic at the site of catheter entry, to ensure there is no pain. Different sedation and pain management practices are used by different medical institutions and practitioners, but patient comfort is always a primary consideration.<a class="footnote-ref" id="fnref:139" href="#fn:139"><sup>139</sup></a> </p><p>The catheter/stent system is inserted into the body by piercing a peripheral artery (an artery in the arm or leg) and moved through the arterial system to deliver the DES into the blocked coronary artery. The stent is then expanded to widen (open) blocked or narrowed coronary arteries (narrowed by plaque buildup), caused by a condition called atherosclerosis. Peripheral arterial access is usually through the femoral (upper leg) or the radial artery (arm/wrist) and less often done through the brachial or ulnar artery (wrist/arm).<a class="footnote-ref" id="fnref:140" href="#fn:140"><sup>140</sup></a><a class="footnote-ref" id="fnref:141" href="#fn:141"><sup>141</sup></a> In the past, controlling bleeding at the point of arterial access after the procedure was a problem. Modern arterial pressure bands and arterial closure systems now exist, which have helped control bleeding after the procedure, but it is still a concern.<a class="footnote-ref" id="fnref:142" href="#fn:142"><sup>142</sup></a><a class="footnote-ref" id="fnref:143" href="#fn:143"><sup>143</sup></a><a class="footnote-ref" id="fnref:144" href="#fn:144"><sup>144</sup></a> </p><p>Modern catheter/stent systems are integrated medical devices, made of a guidewire, catheter, balloon, and stent. The stent tube mesh is initially collapsed onto the balloon of the device, and it is small enough to be passed through relatively narrow peripheral arteries. When in position, the balloon is inflated by introducing physiological saline, and this pushes the overlaying stent firmly into the diseased artery wall, inflation time and pressure are recorded during this placement procedure. After placement, the balloon is deflated, and the device is removed from the body, leaving the expanded stent in place and opening up the artery.<a class="footnote-ref" id="fnref:145" href="#fn:145"><sup>145</sup></a><a class="footnote-ref" id="fnref:146" href="#fn:146"><sup>146</sup></a> </p><p>The interventional cardiologist decides how to treat the blockage in the best way during the PCI/DES placement, based on real-time data. The cardiologist uses imaging data provided by both <a href="/facts/Intravascular_ultrasound/yGCYly34">intravascular ultrasound</a> (IVUS), and <a href="/facts/Fluoroscopy/ySerh62e">fluoroscopic</a> imaging (combined with a <a href="/facts/Radiopaque/TakP45NW">radiopaque</a> dye). During the procedure, the information obtained from these two sources enables the cardiologist to track the path of the catheter-DES device as it moves through the arterial blood vessels. This information also helps determine both the location and characteristics of any plaque causing narrowing in the arteries. Data from these two techniques is used to correctly position the stent and to obtain detailed information relating to the coronary arterial anatomy. Given that this anatomy varies greatly among individuals, having this information becomes a prerequisite for effective treatment. The obtained data is recorded on video and may be used in cases when further treatment is needed.<a class="footnote-ref" id="fnref:147" href="#fn:147"><sup>147</sup></a><a class="footnote-ref" id="fnref:148" href="#fn:148"><sup>148</sup></a><a class="footnote-ref" id="fnref:149" href="#fn:149"><sup>149</sup></a> </p> <h3>Post-stenting recovery and rehabilitation</h3> <p>For many people the stenting procedure does not require staying in the hospital for any extended time period, most people leave the hospital the same day. Much of the time immediately after the stenting is spent in a recovery area to make sure the access site is not bleeding and to ensure vital signs are stable.<a class="footnote-ref" id="fnref:150" href="#fn:150"><sup>150</sup></a> </p><p>In most hospital settings, the interventional cardiologist who performed the procedure will speak directly with the patient/family and give them information about how things went, and follow-up instructions. The nursing staff will keep an eye on the person's condition and use tools like ECG to monitor their heart. To prevent a blood clot from forming in the stent, medications are given right after the procedure. One common medication is <a href="/facts/Plavix/8CTCEKV1">plavix</a>, which is a potent blood thinner that comes as a pill. Other medicines that thin the blood are also used, and it's typical to combine <a href="/facts/Aspirin/opMK4qLk">aspirin</a> with <a href="/facts/Plavix/8CTCEKV1">plavix</a>.<a class="footnote-ref" id="fnref:151" href="#fn:151"><sup>151</sup></a> For people who have had a heart attack, the length of hospitalization is dependent on the degree of heart muscle damage caused by the event.<a class="footnote-ref" id="fnref:152" href="#fn:152"><sup>152</sup></a> </p><p>A catheter with DES is a medical device, so people who receive it are given a medical device card. This card has information on the implanted DES and a medical device serial number. This information is important for future medical procedures, because it helps the doctors to know what type of device is in the person's body. Some arterial closure systems, which are devices that help to seal the access site after the procedure, are also medical devices and have their own informational cards.<a class="footnote-ref" id="fnref:153" href="#fn:153"><sup>153</sup></a> </p><p>The access site is the place where the catheter enters the artery in the arm or leg. There is usually soreness and bruising at this site. This bruising and soreness usually get better after a week or so. People are advised to rest for a week or two and not to lift heavy things. This is mainly to make sure the access site heals well. It is normal to have follow-up appointments with a cardiologist or a primary care provider/general practitioner within a week or two of the procedure.<a class="footnote-ref" id="fnref:154" href="#fn:154"><sup>154</sup></a><a class="footnote-ref" id="fnref:155" href="#fn:155"><sup>155</sup></a> </p><p>People who get a coronary stent usually have more check-ups every three to six months for the first year, but this can vary. They usually do not need to have another <a href="/facts/Coronary_catheterization/qatJzx1X">coronary angiography</a>, which is a test that uses a special dye and X-rays to see the arteries of the heart. If the doctors suspect that the heart disease is getting worse, they can prescribe a stress test, which is a test that measures how the heart works during physical activity. People who have symptoms or show signs of reduced blood flow to the heart in a stress test may need to have a diagnostic cardiac re-catheterization.<a class="footnote-ref" id="fnref:156" href="#fn:156"><sup>156</sup></a> </p><p>After PCI-stenting procedures, physical examinations are important. People who have a high risk of complications or more complex coronary problems may need to have angiography. This may be the case even if the results of non-invasive stress tests, which are tests that measure how the heart works during physical activity, appear normal.<a class="footnote-ref" id="fnref:157" href="#fn:157"><sup>157</sup></a> </p><p>Cardiac rehabilitation activities depend on many factors, but mainly on how much the heart muscle was damaged before the PCI/DES procedure. Many people who have this procedure have not had a heart attack, and their hearts may be fine. Others may have had a heart attack and their hearts may have trouble pumping oxygen-rich blood to the body. Rehabilitation activities are tailored to each person's needs.<a class="footnote-ref" id="fnref:158" href="#fn:158"><sup>158</sup></a> </p> <h2 id="efficacy">Efficacy</h2> <h3>Benefits</h3> <p>DES are an improvement over older BMS devices as they reduce the chances of in-stent blockages. This reduces the incidence of serious post-stenting events such as, angina occurrence or recurrence, heart attacks, and death. They also reduce the likelihood of requiring another PCI procedure to open a blockage caused by the actual stent.<a class="footnote-ref" id="fnref:159" href="#fn:159"><sup>159</sup></a> </p><p>The major benefit of drug-eluting stents (DES) when compared to bare-metal stents (BMS) is the prevention of in-stent restenosis (ISR).<a class="footnote-ref" id="fnref:160" href="#fn:160"><sup>160</sup></a> Restenosis is a gradual re-narrowing of the stented segment that occurs most commonly between 3–12 months after stent placement.<a class="footnote-ref" id="fnref:161" href="#fn:161"><sup>161</sup></a> High rates of restenosis associated with BMS prompted the development of DES, which resulted in a reduction of ISR incidence to around 5-10%.<a class="footnote-ref" id="fnref:162" href="#fn:162"><sup>162</sup></a> Continued development of newer generation DES have resulted in the near-elimination of BMS from clinical practice.<a class="footnote-ref" id="fnref:163" href="#fn:163"><sup>163</sup></a> </p> <h3>Procedure outcomes</h3> <p>A key benefit of DES usage compared to BMS is a lower incidence of repeat revascularization procedures (re-stenting, invasive bypass surgeries etc.). Revascularization procedures are treatments that restore blood flow to parts of the heart that are not getting enough blood, a problem called ischemia. This can happen because of plaque buildup in the arteries of the heart, which can narrow or block them.<a class="footnote-ref" id="fnref:164" href="#fn:164"><sup>164</sup></a> Rates of repeat revascularizations and stent thrombosis (blood clots) are significantly lower in those who received DES compared to BMS.<a class="footnote-ref" id="fnref:165" href="#fn:165"><sup>165</sup></a> </p><p>Newer generations of DES devices have substantially improved safety outcomes, specifically regarding stent thrombosis, recurrent <a href="/facts/Myocardial_infarction/xoGw0qcG">myocardial infarctions</a>, and death.<a class="footnote-ref" id="fnref:166" href="#fn:166"><sup>166</sup></a> </p> <h2 id="considerations-for-regulatory-submission-assessment-and-approval">Considerations for regulatory submission, assessment and approval</h2> <p>There are a number of very detailed medical device design considerations for DES products, these considerations are included in submissions for approval to regulatory authorities such as the US FDA:<a class="footnote-ref" id="fnref:167" href="#fn:167"><sup>167</sup></a> </p> <ul><li>Aspects of the design that relate to a DES as structural devices that keep an artery open by purely physical means.</li> <li>Choice of the construction materials, with a particular focus on <a href="/facts/Biocompatibility/UbGXs4XW">biocompatibility</a>, longevity in the human body, mechanical stress resistance and the suitability of the chosen material for future patient imaging using <a href="/facts/Magnetic_resonance_imaging/Vh9yG9qq">MRI</a> technologies, due to the high magnetic fields used in such imaging.<a class="footnote-ref" id="fnref:168" href="#fn:168"><sup>168</sup></a></li> <li>Choice of a mechanism of the drug release: how long the drug lasts, and how to make the stent release the drug in a manner that inhibits in-stent restenosis.</li> <li>Choice of chemical agent the stent will deliver.</li> <li>Choice of the stent delivery technology as an integrated system: catheter design, placement visualization and assessment of the success of artery reperfusion (is the treated artery actually supplying cardiac muscle with sufficient <a href="/facts/Oxygenated_blood/03zEulkj">oxygenated blood</a>).</li> <li><a href="/facts/Quality_assurance/BhDeyhel">Quality assurance</a> considerations such as those defined in <a href="/facts/ISO_13485/oCWA8vWz">ISO 13485</a>.</li> <li><a href="/facts/Quality_control/lnXbvqvp">Quality control</a> considerations: what testing can be performed on each manufactured unit prior to release for sale to demonstrate its usage suitability.<a class="footnote-ref" id="fnref:169" href="#fn:169"><sup>169</sup></a><a class="footnote-ref" id="fnref:170" href="#fn:170"><sup>170</sup></a><a class="footnote-ref" id="fnref:171" href="#fn:171"><sup>171</sup></a></li> <li>Traceability issues, can a single stent be traced from the manufacturer to the patient it was implanted in. In the case of a recall of a product it is critical to be able to trace the stent from design, manufacture, and distribution to the patient.</li></ul> <p>The drug choice is a critical design element and determining its true effectiveness in inhibiting <a href="/facts/Neointimal_hyperplasia/JGD7j1p2">neointimal</a> growth due to the proliferation of smooth muscle cells that would cause restenosis can be a design challenge. Much of the <a href="/facts/Neointimal_Hyperplasia/JGD7j1p2">neointimal hyperplasia</a> seems to be caused by inflammation.<a class="footnote-ref" id="fnref:172" href="#fn:172"><sup>172</sup></a> </p><p>Vascular stents are classified by the US as class III medical devices,<a class="footnote-ref" id="fnref:173" href="#fn:173"><sup>173</sup></a> meaning that they pose the highest risk to patients and are subject to both general and <a href="/facts/Premarket_approval/2WIHtPjC">premarket approval</a>, which requires clinical trials and scientific evidence of safety and effectiveness, as well as rigorous mechanical testing.<a class="footnote-ref" id="fnref:174" href="#fn:174"><sup>174</sup></a> During the mechanical testing process, universal testing machines induce bending, stretching, twisting, and putting pressure on vascular stents from various angles.<a class="footnote-ref" id="fnref:175" href="#fn:175"><sup>175</sup></a> </p><p>The specific properties of each type of stent and its intended use depend on the results of testing, and vice versa: different types of stents may need different or additional tests based on where they will be placed in the body and what they will be used for. Some of these additional tests might include checking how well the stent can withstand being crushed or bent out of shape, its resistance to getting kinks in it, whether it resists corrosion or damage over time, as well as making sure any coatings on the device remain intact.<a class="footnote-ref" id="fnref:176" href="#fn:176"><sup>176</sup></a> </p> <h2 id="alternatives-to-stenting-procedures">Alternatives to stenting procedures</h2> <p><a href="/facts/Pharmacological_therapy/bEX4Xo3y">Pharmacological therapy</a> for coronary artery disease may be indicated instead of or in addition to invasive treatment. For those requiring <a href="/facts/Percutaneous_coronary_intervention/2zlAdul0">percutaneous coronary intervention</a> or surgery, medical therapy should be viewed as complementary to revascularization procedures, rather than an opposing strategy. <a href="/facts/Coronary_artery_bypass_graft/DDTF1jaB">Coronary artery bypass graft</a> (CABG) surgery is an alternative to percutaneous coronary intervention (PCI) with drug-eluting stents (DES) for patients with ischemic left ventricular systolic dysfunction (LVSD). CABG is associated with lower risks of all-cause mortality, repeat revascularization, and myocardial infarction compared to PCI.<a class="footnote-ref" id="fnref:177" href="#fn:177"><sup>177</sup></a> </p> <h2 id="history">History</h2> <p class="note">See also: <a href="/facts/History_of_invasive_and_interventional_cardiology/2E5Mx38A">History of invasive and interventional cardiology</a></p> <p>The first procedure to treat blocked <a href="/facts/Coronary_artery/Xsx1dekd">coronary arteries</a> was <a href="/facts/Coronary_artery_bypass_graft/DDTF1jaB">coronary artery bypass graft</a> surgery (CABG), wherein a section of vein or artery from elsewhere in the body is used to bypass the diseased segment of the coronary artery. In 1977, <a href="/facts/Andreas_Gr%C3%BCntzig/EA6Kzbk4">Andreas Grüntzig</a> introduced <a href="/facts/Percutaneous_transluminal_coronary_angioplasty/2zlAdul0">percutaneous transluminal coronary angioplasty</a> (PTCA), also called balloon angioplasty, in which a catheter was introduced through a peripheral artery and a balloon expanded to dilate the narrowed segment of the artery.<a class="footnote-ref" id="fnref:178" href="#fn:178"><sup>178</sup></a> </p><p>As equipment and techniques improved, the use of PTCA rapidly increased, and by the mid-1980s, PTCA and CABG were being performed at equivalent rates.<a class="footnote-ref" id="fnref:179" href="#fn:179"><sup>179</sup></a> Balloon angioplasty was generally effective and safe, but restenosis was frequent, occurring in about 30–40% of cases, usually within the first year after dilation. In about 3% of balloon angioplasty cases, failure of the dilation and acute or threatened closure of the coronary artery (often because of dissection) prompted emergency CABGs.<a class="footnote-ref" id="fnref:180" href="#fn:180"><sup>180</sup></a> </p><p><a href="/facts/Charles_Theodore_Dotter/cyNbm4lE">Charles Theodore Dotter</a> and <a href="/facts/Melvin_Judkins/HH7n8WHI">Melvin Judkins</a> had proposed using prosthetic devices inside arteries in the leg to maintain blood flow after dilation as early as 1964.<a class="footnote-ref" id="fnref:181" href="#fn:181"><sup>181</sup></a> In 1986, Puel and Sigwart implanted the first coronary stent in a human patient.<a class="footnote-ref" id="fnref:182" href="#fn:182"><sup>182</sup></a> Several trials in the 1990s showed the superiority of stent placement over balloon angioplasty. Restenosis was reduced because the stent acted as a scaffold to hold open the dilated segment of the artery. Acute closure of the coronary artery (and the requirement for emergency CABG) was reduced, because the stent repaired dissections of the arterial wall. By 1999, stents were used in 84% of <a href="/facts/Percutaneous/nzRyKveF">percutaneous</a> coronary interventions (i.e., those done via a catheter, and not by open-chest surgery).<a class="footnote-ref" id="fnref:183" href="#fn:183"><sup>183</sup></a> </p><p>Early difficulties with coronary stents included a risk of early <a href="/facts/Thrombosis/8Y3wh2UX">thrombosis</a> (clotting) resulting in occlusion of the stent.<a class="footnote-ref" id="fnref:184" href="#fn:184"><sup>184</sup></a> Coating stainless steel stents with other substances such as platinum or gold did not eliminate this problem.<a class="footnote-ref" id="fnref:185" href="#fn:185"><sup>185</sup></a> High-pressure balloon expansion of the stent to ensure its full apposition to the arterial wall, combined with drug therapy using aspirin and another inhibitor of <a href="/facts/Platelet/I0xrDVGa">platelet</a> aggregation (usually <a href="/facts/Ticlopidine/5QtjvYF9">ticlopidine</a> or clopidogrel) nearly eliminated this risk of early stent thrombosis.<a class="footnote-ref" id="fnref:186" href="#fn:186"><sup>186</sup></a><a class="footnote-ref" id="fnref:187" href="#fn:187"><sup>187</sup></a> </p><p>Though it occurred less frequently than with balloon angioplasty or other techniques, stents nonetheless remained vulnerable to restenosis, caused almost exclusively by neointimal tissue growth (tissue formation in the inner 'tube' structure of the artery). To address this issue, developers of drug-eluting stents used the devices themselves as a tool for delivering medication directly to the arterial wall. While initial efforts were unsuccessful, the release (elution) of drugs with certain specific physicochemical properties from the stent was shown in 2001 to achieve high concentrations of the drug locally, directly at the target lesion, with minimal systemic side effects.<a class="footnote-ref" id="fnref:188" href="#fn:188"><sup>188</sup></a> As currently used in clinical practice, "drug-eluting" stents refers to metal stents that elute a drug designed to limit the growth of neointimal scar tissue, thus reducing the likelihood of stent <a href="/facts/Restenosis/cKNYGX9z">restenosis</a>.<a class="footnote-ref" id="fnref:189" href="#fn:189"><sup>189</sup></a> </p><p>The first type of DES to be approved by the <a href="/facts/European_Medicines_Agency/h9FTtCYc">European Medicines Agency</a> (EMA) and the <a href="/facts/US_Food_and_Drug_Administration/rCEnh9WB">US Food and Drug Administration</a> (FDA) were sirolimus-eluting stents (SES), which release a natural product called <a href="/facts/Sirolimus/9hdLP135">sirolimus</a>,<a class="footnote-ref" id="fnref:190" href="#fn:190"><sup>190</sup></a> an immunosuppressant drug.<a class="footnote-ref" id="fnref:191" href="#fn:191"><sup>191</sup></a> SES were shown to reduce the need for repeat procedures and improve the outcomes of patients with coronary artery disease.<a class="footnote-ref" id="fnref:192" href="#fn:192"><sup>192</sup></a><a class="footnote-ref" id="fnref:193" href="#fn:193"><sup>193</sup></a><a class="footnote-ref" id="fnref:194" href="#fn:194"><sup>194</sup></a> The sirolimus-eluting Cypher stent received CE mark approval in Europe in 2002, and then underwent a larger trial to demonstrate its safety and effectiveness for the US market.<a class="footnote-ref" id="fnref:195" href="#fn:195"><sup>195</sup></a><a class="footnote-ref" id="fnref:196" href="#fn:196"><sup>196</sup></a><a class="footnote-ref" id="fnref:197" href="#fn:197"><sup>197</sup></a> The trial, published in 2003, enrolled 1058 patients with more complex lesions and confirmed the superiority of SES over bare metal stents in terms of angiographic and clinical outcomes.<a class="footnote-ref" id="fnref:198" href="#fn:198"><sup>198</sup></a><a class="footnote-ref" id="fnref:199" href="#fn:199"><sup>199</sup></a><a class="footnote-ref" id="fnref:200" href="#fn:200"><sup>200</sup></a><a class="footnote-ref" id="fnref:201" href="#fn:201"><sup>201</sup></a> Based on these results, the Cypher stent received FDA approval and was released in the US in 2003.<a class="footnote-ref" id="fnref:202" href="#fn:202"><sup>202</sup></a> The FDA approval process for DES involves submitting an investigational device exemption (IDE) application to conduct clinical trials under 21 CFR Part 812, and then a premarket approval (PMA) application to obtain marketing authorization under 21 CFR Part 8144. The FDA assigns the primary review responsibility to the Center for Devices and Radiological Health (CDRH), but also consults with the Center for Drug Evaluation and Research (CDER) for the drug component of the combination product. </p><p>The second type of DES to be approved by the EMA and the FDA were paclitaxel-eluting stents (PES), which release another natural product called <a href="/facts/Paclitaxel/sGxTE647">paclitaxel</a>. PES also reduced the need for repeat procedures and improved the outcomes of patients with different types of lesions and risk factors. The paclitaxel-eluting Taxus stent received FDA approval and was launched in the US in 2004,<a class="footnote-ref" id="fnref:203" href="#fn:203"><sup>203</sup></a> after a series of trials that compared it with a bare metal stent in various settings. The trials showed a significant reduction in target lesion revascularization and major adverse cardiac events with the Taxus stent at 9 and 12 months. Both SES and PES use natural products as the active agents to prevent the recurrence of blockages in the arteries.<a class="footnote-ref" id="fnref:204" href="#fn:204"><sup>204</sup></a> These DES have changed the practice of interventional cardiology and have become the preferred treatment for many patients with coronary artery disease.<a class="footnote-ref" id="fnref:205" href="#fn:205"><sup>205</sup></a><a class="footnote-ref" id="fnref:206" href="#fn:206"><sup>206</sup></a><a class="footnote-ref" id="fnref:207" href="#fn:207"><sup>207</sup></a> </p><p>The initial rapid acceptance of DES led to their peak usage in 2005, accounting for 90% of all stent implantations, but concerns about late stent thrombosis led to a decrease in DES usage in late 2006. Subsequent studies reassured the medical community about their safety, showing that while DES may have a slightly higher risk for very late stent thrombosis, they significantly reduce target vessel revascularization without increasing the incidence of death or myocardial infarction; these reassurances led to a resurgence in DES utilization, although it did not reach the peak usage rates seen in early 2006.<a class="footnote-ref" id="fnref:208" href="#fn:208"><sup>208</sup></a><a class="footnote-ref" id="fnref:209" href="#fn:209"><sup>209</sup></a> </p><p>The concept of using absorbable (also called biodegradable, bioabsorbable or bioresorbable)<a class="footnote-ref" id="fnref:210" href="#fn:210"><sup>210</sup></a> materials in stents was first reported in 1878 by Huse who used magnesium wires as ligatures to halt the bleeding in vessels of three patients. Despite extensive search, the full name of this pioneer in the field remains elusive.<a class="footnote-ref" id="fnref:211" href="#fn:211"><sup>211</sup></a><a class="footnote-ref" id="fnref:212" href="#fn:212"><sup>212</sup></a> In 20th century, a resorbable stent tested in humans was developed by the Igaki Medical Planning Company in Japan and was constructed from poly-L-lactic acid (a form of <a href="/facts/Polylactic_acid/QHoY2H5I">polylactic acid</a>); they published their initial results in 2000.<a class="footnote-ref" id="fnref:213" href="#fn:213"><sup>213</sup></a> The German company <a href="/facts/Biotronik/ns5eHctf">Biotronik</a> developed a <a href="/facts/Magnesium/XyIhd2FG">magnesium</a> absorbable (bioresorbable) stent and published clinical results in 2007.<a class="footnote-ref" id="fnref:214" href="#fn:214"><sup>214</sup></a> </p><p>The first company to bring a bioresorbable stent to market was <a href="/facts/Abbott_Laboratories/G0uWjHK9">Abbott Vascular</a> which received European marketing approval in September 2012; the second was Elixir which received its CE mark in May 2013.<a class="footnote-ref" id="fnref:215" href="#fn:215"><sup>215</sup></a><a class="footnote-ref" id="fnref:216" href="#fn:216"><sup>216</sup></a><a class="footnote-ref" id="fnref:217" href="#fn:217"><sup>217</sup></a> </p><p>Despite the initial promise, the first-generation bioresorbable stents, such as the Absorb bioresorbable stent by Abbott, faced significant challenges in their performance. In comparison to current-generation drug-eluting stents, numerous trials revealed that these first-generation bioresorbsble stents exhibited poor outcomes. Specifically, they showed high rates of stent thrombosis (cases where an implanted coronary stent caused a thrombotic occlusion), target-lesion myocardial infarction (heart attack occurring at the site of the treated lesion), and target vessel revascularization (the need for further procedures to restore blood flow in the treated artery). In 2017, Abbott pulled its bioabsorbable stent, Absorb, from the European market after negative press regarding the device.<a class="footnote-ref" id="fnref:218" href="#fn:218"><sup>218</sup></a> <a href="/facts/Boston_Scientific/XmyKQUA5">Boston Scientific</a> also announced termination of its Renuvia bioresorbable coronary stent program as studies showed higher risk of serious adverse events.<a class="footnote-ref" id="fnref:219" href="#fn:219"><sup>219</sup></a> </p><p>Currently, fully bioresorbable stents do not play a significant role in coronary interventions.<a class="footnote-ref" id="fnref:220" href="#fn:220"><sup>220</sup></a><a class="footnote-ref" id="fnref:221" href="#fn:221"><sup>221</sup></a><a class="footnote-ref" id="fnref:222" href="#fn:222"><sup>222</sup></a> While various manufacturers are proposing new stents and continuing their development,<a class="footnote-ref" id="fnref:223" href="#fn:223"><sup>223</sup></a> it remains uncertain whether they will have a substantial impact, unless there will be more data from their clinical trials. As of now, these stents are not widely utilized in practice.<a class="footnote-ref" id="fnref:224" href="#fn:224"><sup>224</sup></a><a class="footnote-ref" id="fnref:225" href="#fn:225"><sup>225</sup></a><a class="footnote-ref" id="fnref:226" href="#fn:226"><sup>226</sup></a> </p><p>Due to challenges in developing resorbable stents, many manufacturers have focused efforts on targeting or reducing drug release through bioabsorbable-polymer coatings. Boston Scientific's Synergy bioabsorbable polymer stent has been shown potential to reduce the length of dual antiplatelet therapy post-implantation.<a class="footnote-ref" id="fnref:227" href="#fn:227"><sup>227</sup></a> <a href="/facts/MicroPort/KeNboQch">MicroPort's</a> Firehawk target eluting stent has been shown to be non-inferior to traditional drug-eluting stents while using one-third of the amount of equivalent drug.<a class="footnote-ref" id="fnref:228" href="#fn:228"><sup>228</sup></a> </p><p>As for the materials used to make a DES, the first DES products available for treating patients were stainless steel alloys composed of iron, nickel, and chromium and were based on existing bare metal stents.<a class="footnote-ref" id="fnref:229" href="#fn:229"><sup>229</sup></a> These stents were hard to visualize with medical imaging, posed a risk of causing allergic responses, and were difficult to deliver. Subsequent new alloys were used, namely <a href="/facts/Cobalt-chrome/k0jkxBys">cobalt-chrome</a> and platinum chrome, with improved performance. <a href="/facts/Bioresorbable_stents/T0B8VVkp">Bioresorbable stents</a> have been developed in which the stent itself dissolves over time.<a class="footnote-ref" id="fnref:230" href="#fn:230"><sup>230</sup></a> Materials explored for use include <a href="/facts/Magnesium/XyIhd2FG">magnesium</a>, <a href="/facts/Polylactic_acid/QHoY2H5I">polylactic acid</a>, <a href="/facts/Polycarbonate/QU8sH1c6">polycarbonate</a> polymers, and <a href="/facts/Salicylic_acid/qz7RRQCR">salicylic acid</a> polymers.<a class="footnote-ref" id="fnref:231" href="#fn:231"><sup>231</sup></a> Resorbable stents have held the promise of providing an acute treatment that would eventually allow the vessel to function normally, without leaving a permanent device behind.<a class="footnote-ref" id="fnref:232" href="#fn:232"><sup>232</sup></a> </p><p>For the coating of DES, one to three or more layers of <a href="/facts/Polymer/eF32E50K">polymer</a> can be used: a base layer for adhesion, a main layer that holds and elutes (releases) the drug into the arterial wall by contact transfer, and sometimes a top coat to slow down the release of the drug and extend its effect. The first few drug-eluting stents to be licensed used durable coatings. The first generation of coatings appears to have caused immunological reactions at times, and some possibly led to thrombosis. This has driven experimentation and the development of new coating approaches.<a class="footnote-ref" id="fnref:233" href="#fn:233"><sup>233</sup></a> </p> <h2 id="research-directions">Research directions</h2> <p>A research direction for a DES is to improve the material from which a device is made. The first-generation DES were made of stainless steel, while contemporary DES mainly consist of different kinds of alloys such as cobalt chromium and platinum chromium. In the current generation DES, thinner struts are employed than in the first-generation DES with preserved radial strength and radio-opacity. The lower strut thickness is believed to be associated with better stent-related outcomes including target lesion revascularization, myocardial infarction, and stent thrombosis.<a class="footnote-ref" id="fnref:234" href="#fn:234"><sup>234</sup></a> </p><p>Another area of research for DES focuses on polymers. The current generation DES includes both durable polymer-coated stents and biodegradable polymer-coated stents. It has been reported that the presence of a durable polymer in the body over a long period can lead to chronic inflammation and neoatherosclerosis. To address this potential limitation, researchers have developed biodegradable polymer DES as an alternative solution.<a class="footnote-ref" id="fnref:235" href="#fn:235"><sup>235</sup></a><a class="footnote-ref" id="fnref:236" href="#fn:236"><sup>236</sup></a><a class="footnote-ref" id="fnref:237" href="#fn:237"><sup>237</sup></a> </p><p>Scientists are also studying different drugs that could be used in DES to prevent restenosis. These drugs, which have immunosuppressive<a class="footnote-ref" id="fnref:238" href="#fn:238"><sup>238</sup></a> and anti-cancer properties, aim to inhibit the growth of smooth muscle cells. Additionally, there is a specific type of stent that features an extra layer of anti-CD4 antibodies on its struts. This additional layer is positioned on top of the polymer coating and aims to capture circulating endothelial progenitor cells. The goal behind this design is to promote improved healing of the blood vessel lining, known as the <a href="/facts/Endothelium/L4ENFVnw">endothelium</a>.<a class="footnote-ref" id="fnref:239" href="#fn:239"><sup>239</sup></a><a class="footnote-ref" id="fnref:240" href="#fn:240"><sup>240</sup></a> </p><p>A potential research focus for DES is the application of a polymer-free DES in clinical practice: moving away from polymer-based DES and instead using either a polymer-free DES or a drug-coated coronary stent. In the case of the polymer-free DES, it utilizes an abluminal coating of probucol to control the release of sirolimus. On the other hand, the drug-coated coronary stent has a micro-structured abluminal surface that allows for direct application of an anti-restenotic drug.<a class="footnote-ref" id="fnref:241" href="#fn:241"><sup>241</sup></a><a class="footnote-ref" id="fnref:242" href="#fn:242"><sup>242</sup></a> </p> <h2 id="society-and-culture">Society and culture</h2> <h3>Brand names and manufacturers</h3> <p>As of 2023<a href="https://en.wikipedia.org/w/index.php?title=Drug-eluting_stent&action=edit">[update]</a> there are over 20 different types of drug-eluting stents available, with differences in features and characteristics.<a class="footnote-ref" id="fnref:243" href="#fn:243"><sup>243</sup></a> </p> <h3>Economics</h3> <p>The economic evaluation of DES has been a topic of extensive research.<a class="footnote-ref" id="fnref:244" href="#fn:244"><sup>244</sup></a> In 2007, the overall incremental cost-effectiveness ratio in Europe was €98,827 per quality-adjusted life-years gained. Avoiding one revascularization with DES would cost €4,794, when revascularization with BMS costs €3,2606.<a class="footnote-ref" id="fnref:245" href="#fn:245"><sup>245</sup></a> </p> <h3>Controversies</h3> <p>There were controversies related to the use of DES. In 2012, a <a href="/facts/Meta-analysis/IcfChd8z">meta-analysis</a> of clinical trial data<a class="footnote-ref" id="fnref:246" href="#fn:246"><sup>246</sup></a> showed no benefit of the use of DES for people with stable coronary artery compared to treatment with drugs, yet, <a href="/facts/The_New_York_Times/T9marWVX">The New York Times</a> interviewed David Brown, an author of the analysis, who said that more than half of patients with stable <a href="/facts/Coronary_artery_disease/szCt0nVx">coronary artery disease</a> were implanted with stents without even trying drug treatment and that he believed this happened because hospitals and doctors wanted to make more money.<a class="footnote-ref" id="fnref:247" href="#fn:247"><sup>247</sup></a> </p><p>The interview sparked a debate among cardiologists, researchers, and patients about the appropriateness and effectiveness of DES for stable coronary artery disease: some agreed with the study's findings and questioned the overuse of stents,<a class="footnote-ref" id="fnref:248" href="#fn:248"><sup>248</sup></a><a class="footnote-ref" id="fnref:249" href="#fn:249"><sup>249</sup></a><a class="footnote-ref" id="fnref:250" href="#fn:250"><sup>250</sup></a> while others criticized the study's methods and limitations and defended the benefits of stents, arguing that the interviewee's statement was "outrageous and defamatory" and that he was "insulting the integrity of the entire profession.<a class="footnote-ref" id="fnref:251" href="#fn:251"><sup>251</sup></a><a class="footnote-ref" id="fnref:252" href="#fn:252"><sup>252</sup></a><a class="footnote-ref" id="fnref:253" href="#fn:253"><sup>253</sup></a> </p><p>In 2013 the Times of India reported that DES were widely overused and that Indian distributors used profits from high <a href="/facts/Markup_(business)/pvr8zdNG">markups</a> on DES to bribe doctors to use them.<a class="footnote-ref" id="fnref:254" href="#fn:254"><sup>254</sup></a><a class="footnote-ref" id="fnref:255" href="#fn:255"><sup>255</sup></a> </p><p>In 2014 an investigation by the <a href="/facts/Maharashtra/4hAVYlb4">Maharashtra</a> Food and Drug Administration found that high markups and bribery related to DES was still widespread.<a class="footnote-ref" id="fnref:256" href="#fn:256"><sup>256</sup></a> </p> <h3>Intellectual property disputes</h3> <p>There have been several patent disputes related to drug-eluting stents. In one of them, Boston Scientific Corporation (BSC) has been found guilty of infringing upon a patent awarded to the University of Texas at Arlington in 2003 and licensed to TissueGen.<a class="footnote-ref" id="fnref:257" href="#fn:257"><sup>257</sup></a><a class="footnote-ref" id="fnref:258" href="#fn:258"><sup>258</sup></a><a class="footnote-ref" id="fnref:259" href="#fn:259"><sup>259</sup></a> This patent involves technology developed by TissueGen founder Kevin Nelson, during his time as a faculty member at the university. The technology is designed to deliver drugs through an extruded fiber within an implanted vascular stent. As a result, BSC has been ordered to pay $42 million in lost royalties to both TissueGen and the university<a class="footnote-ref" id="fnref:260" href="#fn:260"><sup>260</sup></a><a class="footnote-ref" id="fnref:261" href="#fn:261"><sup>261</sup></a> </p> <h3>Class action lawsuits</h3> <p>Drug-eluting stents have been associated with legal and ethical controversies, and there have been related class action lawsuits. In 2014, the former owners of St. Joseph Medical Center in Maryland settled a class action lawsuit for $37 million with hundreds of patients who received unnecessary DES implantation. The lawsuit alleged that Dr. Mark Midei, a cardiologist at the center, falsified the degree of coronary artery stenosis to justify the use of DES, exposing the patients to increased risks of thrombosis, bleeding, and infection. Another DES manufacturer, Cordis Corporation, a subsidiary of Johnson & Johnson, was involved in lawsuits from people who suffered adverse events from the Cypher Stent, a stainless-steel DES coated with sirolimus,<a class="footnote-ref" id="fnref:262" href="#fn:262"><sup>262</sup></a><a class="footnote-ref" id="fnref:263" href="#fn:263"><sup>263</sup></a> an immunosuppressant drug.<a class="footnote-ref" id="fnref:264" href="#fn:264"><sup>264</sup></a> The Cypher Stent was approved by the FDA in 2003, but soon after, the FDA issued a Safety Warning following 290 reports of subacute thrombosis and at least 60 deaths related to the device.<a class="footnote-ref" id="fnref:265" href="#fn:265"><sup>265</sup></a><a class="footnote-ref" id="fnref:266" href="#fn:266"><sup>266</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Bioresorbable_stent/T0B8VVkp">bioresorbable stent</a> – medical stent that dissolves or is absorbed by the body;</li> <li><a href="/facts/Coronary_stent/DnL2WCJV">coronary stent</a> – medical stent implanted into coronary arteries;</li> <li><a href="/facts/Drug-eluting_implant/VSfNkU2t">drug-eluting implant</a> – implant for delivering a drug.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Stent: MedlinePlus Medical Encyclopedia". 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