electrical alternans


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e·lec·tri·cal al·ter·nans

electrical alternation of the heart.

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

e·lec·tri·cal al·ter·nans

(ĕ-lek'tri-kăl awl-ter'nanz)
Alternation in the amplitude of P waves, QRS complexes, or T waves as observed by electrocardiography.

electrical alternans

Beat-to-beat changes in one or more portions of the electrocardiogram.
References in periodicals archive ?
Electrical alternans and vulnerability to ventricular arrhythmias.
His electrocardiogram revealed atrial fibrillation with a rapid ventricular rate (RVR) and electrical alternans. Chest radiograph showed enlargement of the cardiac silhouette.
Percentage No finding 1 Increased R amplitude 23 20.36 2 Deep S wave 03 2.66 3 Increased P wave 07 6.20 amplitude 4 Electrical alternans and 05 4.42 deep S wave 5 Deep S and Wide P wave 05 4.42 6 Deep Q wave 08 7.08 7 Wide P wave 04 3.54 8 Low voltage QRS 08 7.08 complexes 9 Ventricular tachycardia 08 7.08 10 Absence of P wave 04 3.54 11 ST coving 10 8.85 12 Ventricular pre mature 05 4.42 complexes 13 Fine atrial fibrillation 06 5.31 14 Wide QRS 06 5.31 15 Electrical alternans 06 5.31 16 Elevated T wave 05 4.42 Total 113 100 Table 8.
* The 12-lead ECG may reveal small-voltage QRS complexes with electrical alternans due to swinging of the heart within a large collection (Fig.
Karma, "Electrical alternans and spiral wave breakup in cardiac tissue," Chaos, vol.
Cohen, "Electrical alternans and cardiac electrical instability," Circulation, vol.
(7) Typical ECG changes (e.g., electrical alternans) may be found in cases with cardiac tamponade.
The two most common findings are low voltage, due to impaired transmission across the pericardial fluid, and electrical alternans, a phenomenon caused by swinging of the heart from beat to beat
In terms of ECG findings, pneumomediastinum presents in various ways such as electrical alternans, T-wave inversions, poor R-wave progression, and low voltage QRS other than ST elevation [9, 10].
There was no associated electrical alternans. Lab tests revealed negative troponin, INR of 1.3, and PTT of 28 s.
PR segment depressions, electrical alternans, and low QRS voltage were absent.
Chang, "Hyperkalemia-induced Brugada pattern with electrical alternans," Annals of Noninvasive Electrocardiology, vol.

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