Medical Dictionary

alternans

noun al·ter·nans \ ˈȯl-tər-ˌnanz \

medical Definition of alternans

:alternation in the pattern of activity (such as that produced by the heartbeat)
  • Her electrocardiogram showed small spikes that alternated in shape—a classic sign of cardiac tamponade called electrical alternans.
  • —Tony DajerDiscoverMarch 2002
  • The noninvasive detection of an increased risk of ventricular fibrillation may be made possible by the identification of T-wave alternans, a beat-to-beat fluctuation in the area under the T wave that is associated with an increased risk of lethal arrhythmia.
  • —James E. Muller and Richard L. VerrierThe New England Journal of Medicine15 Feb. 1996
— see pulsus alternans

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