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.
1. occurrence in fours.
2. the occurrence of four beats of the pulse followed by a pause.
A cardiac arrhythmia in which every fourth beat is a premature contraction.
[L. quadrigeminus, fourfold]