Table 1.

Mouse ECG measurements

Variable	Tbx5+/+	Tbx5del/+	Tbx5vdel/+
Heart rate (min−1)	623 ± 39	571 ± 51	660 ± 71
P width	10.8 ± 0.5	17.7 ± 0.4*	10.2 ± 0.3
PQ interval (ms)	31.2 ± 1.9	40.0 ± 0.9*	31.7 ± 1.9
QRS width	12.7 ± 0.91	11.5 ± 1.3	12.4 ± 1.19
Arrhythmias	None	1,2 AVB, sinus pause	None

Telemetry electrocardiogram measurements at 8–10 weeks of age (mean ± SEM); n = 10–12;

*, P < 0.05 vs.WT.