Table 1.

Incidences of atrial arrhythmic events during programmed electrical stimulation and incremental pacing in young and aged wild‐type (WT) and Pgc1β ^−/− hearts

	S1S2 protocol		Incremental pacing
Experimental group	Atrial tachycardia	Ectopic events	Atrial tachycardia	Ectopic events
Young WT	3/20	8/20	0/20	2/20
Aged WT	4/23	8/23	1/23	4/23
Young Pgc1β −/−	5/23	13/23	1/23	4/23
Aged Pgc1β −/−	11/22*	8/22	1/22	10/22*

Data are represented as arrhythmic over total number studied. ^* P < 0.05 on Fisher exact testing.