Table 2.

Comparison of patients with PICM pre- and postupgrade to CRT

	Preupgrade	Postupgrade	P Value
Full cohort (N = 43)
Paced QRS, ms	186.1 ± 23.3	158.1 ± 25.9	.022
Left ventricular end-diastolic diameter, cm	5.9 ± 0.9	5.4 ± 0.9	.003
Left ventricular ejection fraction, %	28.7 ± 8.4	44.3 ± 9.4	<.001
NYHA functional class	2.4 ± 0.5	1.3 ± 0.5	<.001
Severe PICM (n = 37)
Paced QRS, ms	186.3 ± 21.2	163.5 ±19.2	<.001
Left ventricular end-diastolic diameter, cm	6.2 ± 0.8	5.6 ± 0.9	.006
Left ventricular ejection fraction, %	26.4 ± 6.5	42.6 ± 9.2	<.001
NYHA functional class	2.4 ± 0.5	1.3 ± 0.5	<.001
Mild-to-moderate PICM (n = 6)
Paced QRS, ms	176.0 ± 36.1	139.8 ± 43.7	.031
Left ventricular end-diastolic diameter, cm	4.7 ± 0.5	4.7 ± 0.5	.946
Left ventricular ejection fraction, %	43.3 ± 2.6	55.8 ± 2.04	<.001
NYHA functional class	2.3 ± 0.6	1.3 ± 0.6	.051

Values are mean ± SD.

NYHA = New York Heart Association; PICM = pacing-induced cardiomyopathy.