Table 2.

Electrocardiographic Data

	RR (ms)		PR (ms)		QRS (ms)		QT (ms)		QT index (%)
	Base	4w	Base	4w	Base	4w	Base	4w	Base	4w
C (n=9)	313 (11)	324 (17)	76 (5)	81 (4)	39 (3)	36 (5)	177 (7)	175 (8)	116 (3)	111 (2)
RV (n=11)	271 (14)	295 (12)	76 (3)	87 (4)	44 (1)	39 (3)	159 (8)	174 (5)	112 (2)	112 (3)
BIV (n=13)	313 (12)	298 (10)	76 (2)	78 (3)	41 (2)	36 (2)	174 (5)	156 (3)*	112 (3)	102 (3)†

All measurements are represented as mean (standard error)

Base = baseline pre-surgery value

4w = 4 weeks after surgery

QT index is the percentage of the ratio of the QT measured to the QT expected based on the heart rate. QT expected is calculated using the equation: QT exp = 86 + 0.22 × RR where RR is the cardiac cycle length.

^*p<0.01 for the comparison of BIV group versus C and RV groups

^†p<0.05 for the comparison of BIV group versus C and RV group