Table 3.

Electrocardiographic Indices and Electrophysiologic Data in C57BL/6J Wildtype Sham and Paced Mice

	Sham-Paced, 6 hr	Paced, 6 hr
QRS Duration, ms	11.1 ± 0.7 (-1.3 ± 0.7)	14.1 ± 1.0 (0.9 ± 1.1)
RR Interval, ms	144.6 ± 8.0 (12.6 ± 8.3)	144.6 ± 4.7 (0.9 ± 7.0)
QTc, ms	97.7 ± 4.2 (-6.7 ± 5.7)	106.2 ± 2.3 (0.6 ± 4.1)
VERP100, ms	34.3 ± 4.5	34.2 ± 3.0
VERP80, ms	36.3 ± 4.3	35.0 ± 3.6

Post-pacing data (and changes from pre-pacing baseline) are presented as group means ± SEM. Comparisons between groups were performed with unpaired T-tests. For electrocardiographic indices, n = 8 sham and 14 paced; for electrophysiologic data (VERP), n = 5 in each group. VERP, ventricular effective refractory period.