The Use of Epicardial Electrogram as a Simple Guide to Select the Optimal Site of Left Ventricular Pacing in Cardiac Resynchronization Therapy

Table 4

Comparison of the value of ED in patients with ischemic and nonischemic cardiomyopathy.

	IDCM		NIDCM
	r	P	r	P
ED versus Δ LVEF	+0.39	.06	+0.20	.17
ED versus Δ NYHA	−0.44	.03	−0.26	.07
Ratio of ED/QRS duration versus Δ LVEF	+0.37	.08	+0.08	.57
Ratio of ED/QRS duration versus Δ NYHA	−0.41	.05	−0.23	.11

Abbreviations: IDCM: ischemic dilated cardiomyopathy, NIDCM: nonischemic dilated cardiomyopathy, ED: electrical delay, Δ LVEF: difference of LVEF between follow-up and baseline, Δ NYHA: difference of NYHA between follow-up and baseline, r: correlation coefficient determined by regression analysis, P: P value.