electrical alternans

electrical alternans
alternating variations in the amplitude of specific electrocardiographic waves over successive cardiac cycles.

Medical dictionary. 2011.

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  • Electrical alternans — is an electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats. It is seen in cardiac tamponade and is thought to be related to changes in the ventricular electrical axis due to fluid in the pericardium.ee… …   Wikipedia

  • alternans — Alternating; often used substantively for alternation of the heart, either electrical or mechanical. Alternating; used as a noun in the sense of pulsus a.. [L.] auditory a. SYN: auscultatory a.. auscultatory a. alternation in the intensity of… …   Medical dictionary

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  • T wave alternans — (TWA) is a periodic beat to beat variation in the amplitude or shape of the T wave in an electrocardiogram (ECG or EKG). T wave of ECG TWA was first described in 1908. At that time, only large variations ( macroscopic TWA) could be detected.… …   Wikipedia

  • alternation of the heart — alternating variation in the intensity of the heartbeat or pulse over successive cardiac cycles of regular rhythm. Called also mechanical alternans. Cf. electrical alternans …   Medical dictionary

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