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Reference.org
Collapsing pulse
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<p>Watson's water hammer pulse, also known as Corrigan's pulse or collapsing pulse, is the medical <a href="/facts/Sign_(medicine)/BzP6MrTN">sign</a> (seen in aortic regurgitation) which describes a <a href="/facts/Pulse/Bg8EUcWL">pulse</a> that is bounding and forceful, rapidly increasing and subsequently collapsing, as if it were the sound of a <a href="/facts/Water_hammer/z4coe4cN">water hammer</a> that was causing the pulse. </p>