a cardiac arrhythmia in which the heartbeats are grouped in fours, each usually composed of one sinus beat followed by three extrasystoles, but a repetitive group of four of any composition is quadrigeminal.
Farlex Partner Medical Dictionary © Farlex 2012
A cardiac arrhythmia in which every fourth beat is a premature contraction.
[L. quadrigeminus, fourfold]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012