atrial capture beat

atrial cap·ture beat

the cardiac cycle resulting when, after a period of A-V dissociation, the atria regain control of the ventricles; atrial depolarization results from retrograde transmission from a ventricular ectopic beat or an electronically paced ventricular impulse.

a·tri·al cap·ture beat

(ā'trē-ăl kap'shŭr bēt)
The cardiac cycle resulting when, after a period of atrioventricular dissociation, the atria regain control of the ventricles; atrial depolarization due to retrograde transmission from a ventricular ectopic beat or an electronically paced ventricular impulse.