quadrigeminal rhythm

qua·dri·gem·i·nal rhyth·m

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.
Synonym(s): quadrigeminy

quad·ri·gem·i·nal rhythm

(kwahd'ri-jem'i-năl ridh'ŭm)
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.