Table 3.

Differences in echocardiographic variables and QRS duration between baseline and the 6-month follow-up and between responders and nonresponders.

Variables	Responders, baseline	Responders, 6 months	p value vs baseline	Nonresponders, baseline	Nonresponders, 6 months	p value vs baseline
LVEDD (mm)	68.3 ± 9.4	63.1 ± 11.9	0.005	70.7 ± 11.3‡	67.9 ± 8.3 §	0.089
LVESD (mm)	57.4 ± 10.8	49.3 ± 13.5	0.001	58.5 ± 12.3‡	55.1 ± 9.7 †	0.330
LVEDV (mL) ∗	193 (165–229)	140 (105–165)	<0.001	177 (132–227) ‡	184 (146–240)!!	0.014
LVESV (mL) ∗	140 (116–175)	83 (56–108)	<0.001	135 (94–165) ‡	132 (90–166)!!	0.243
LVEF (%)	26.8 ± 5.5	41.8 ± 9.3	<0.001	28.6 ± 5.5§	30.5 ± 6.6!!	0.018
QRS (ms)	163 ± 18	137 ± 28	<0.001	158 ± 18 ‡	141 ± 33‡	<0.001

Continuous variables are expressed as mean ± SD, and compared by Student's t-test for paired samples (baseline vs 6 months) and for independent samples (responder vs nonresponders), or as median and 25°/75° percentiles ( ^∗), and compared by the related samples Wilcoxon signed rank test (baseline vs 6 months) and by the independent samples Mann–Whitney U test, as appropriate. LVEDD, left ventricular end-diastolic diameter; LVESD, left ventricular end-systolic diameter; LVEDV, left ventricular end-diastolic volume; LVESV, left ventricular end-systolic volume; and LVEF, left ventricular ejection fraction; and †Paoletti Perini is the family name.  ^‡p n.s. versus responders;  ^§p < 0.05 versus responders;  ^†p < 0.01 versus responders; ^!!p < 0.001 versus responders.