Myocardial Scar on Surface ECG: Selvester Score, but Not Fragmentation, Predicts Response to CRT

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	value vs baseline	Nonresponders, baseline	Nonresponders, 6 months	value vs baseline
LVEDD (mm)	68.3 ± 9.4	63.1 ± 11.9	0.005	70.7 ±	67.9 ± 8.3	0.089
LVESD (mm)	57.4 ± 10.8	49.3 ± 13.5	0.001	58.5 ±	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. n.s. versus responders; versus responders; versus responders; ^!! versus responders.