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 Dajer, Discover, March 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. Verrier, The New England Journal of Medicine, 15 Feb. 1996 — see pulsus alternans

Comments on alternans

What made you want to look up alternans? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to deposit or conceal in a hiding place

Get Word of the Day daily email!

Test Your Vocabulary

Name that Food Quiz

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!