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a wave |
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a wave A component of a normal jugular phlebogram produced by retrograde transmission of the pressure pulse, corresponding to atrial systole; the a wave begins before the first heart sound peaking at the moment the first sound begins;
abnormalites of the a wave indicate cardiopulmonary disease; it may disappear in A Fib, be 'swallowed' in the v-y descent of a prolonged P-Q interval, it may be very large–giant when the atrium is contracting against
resistance–eg tricuspid valve stenosis or atresia, pulmonary HTN or pulmonary edema or bear a presystolic 'notch'–pulmonary edema. Cf Cannon wave. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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