Table 2.

Pacing measurements at baseline and after 18 months according to LVEF level

Group		R-wave amplitude (V)	P	Capture threshold (mV)	P	Lead impendence (Ω)	P	QRS duration (ms)	P	Ventricular pacing (%)	P
Low LVEF (35%–40%)
Baseline	Septal	11.0±3.5	0.398	0.7±0.2	0.162	778±211	0.041	144±23	0.023
	Apical	12.7±6.9		0.6±0.2		913±130		165±26
18 months	Septal	14.4±7.9	0.165	0.7±0.3	0.754	566±201	0.019	134±32	<0.001	91±20	0.875
	Apical	11.2±4.6		0.7±0.4		732±170		173±22		95±17
High LVEF (40%–50%)
Baseline	Septal	11.5±5.7	0.381	0.7±0.3	0.417	680±96	0.002	149±23	0.022
	Apical	12.7±4.5		0.6±0.2		807±192		164±25
18 months	Septal	12.3±5.4	0.408	0.7±0.2	0.538	610±120	0.013	153±18	<0.001	93±16	0.925
	Apical	11.3±3.7		0.7±0.4		711±175		175±20		94±21

Data are expressed as mean±SD