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electrical alternans |
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alternans /al·ter·nans/ (awl-ter´nanz) [L.] 1. alternating; see pulsus alternans. 2. alternation. electrical alternans alternating variations in the amplitude of specific electrocardiographic waves over successive cardiac cycles. mechanical alternans alternation of the heart, particularly in contrast to electrical alternans. pul´sus alternans see under pulsus. total alternans pulsus alternans in which alternating beats are so weak as to be undetected, causing apparent halving of the pulse rate. electrical alternans Cardiology Marked swings in the QRS complex amplitude, which occur every 2 to 3 beats, caused by 'circus movement' in the myocardium Etiology Cardiac tamponade, pericardial effusion, pneumopericardium, cardiac muscle
dysfunction, and paroxysmal SVT; EA may presage sudden cardiac death, and may precede V Fib in Pts undergoing coronary angioplasty or those with Prinzmetal's angina, congenital prolonged QT syndrome, acute MI, catecholamine excess, electrolyte
derangements; EA affecting the ST segment and T wave is common in Pts at risk for ventricular arrhythmias–VAs and may be a noninvasive marker of susceptibility to VAs 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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| ? Mentioned in | ? References in periodicals archive | |
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2) Rosenbaum DS, Jackson LE, Smith JM, Garan H, Ruskin JN, Cohen RJ: Electrical Alternans and Vulnerability to Ventricular Arrhythmias. |
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