V wave

V wave

a large pressure wave visible in recordings from either atrium or its incoming veins, normally produced by venous return but apparently becoming very large when blood regurgitates through the AV valve beyond the chamber from which the recording is made. This regurgitant wave is not a true V wave, which is a passive (filling) wave.
Farlex Partner Medical Dictionary © Farlex 2012

v wave

Cardiology The wave in the normal jugular phlebogram which corresponds to the atrial diastole
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

V wave

(wāv)
A large pressure wave visible in recordings from either atrium or its incoming veins, normally produced by venous return but becoming very large when blood regurgitates through the atrioventricular valve beyond the chamber from which the recording is made.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012