Clinical and Prognostic Significance of Idiopathic Left Bundle-Branch Block in Young Adults

Table 2

Echocardiographic parameters on enrollment and during follow-up. Data during follow-up do not include those of the patient who developed a dilated cardiomyopathy. Abbreviations: LVEDVi = indexed left ventricular end-diastolic volume; LVESVi = indexed left ventricular end-systolic volume; LVEF = left ventricular ejection fraction; E cm/s = early mitral inflow velocity; A cm/s = late-diastolic mitral inflow velocity; Longitudinal LVdys = left ventricular dyssynchrony index; IVMD = interventricular mechanical delay; SPMWD = septal to posterior wall motion delay; P non-significant (NS) when >0.05

	Basal echocardiogram; N = 57	Echocardiogram during follow-up; N = 56
LVEDVi (Ml/m^2)	78 ± 15	80 ± 14	NS
LVESVi (Ml/m^2)	33 ± 8	34 ± 7	NS
LVEF (%)	59 ± 6	58 ± 9	NS
E (cm/s)	54 ± 16	53 ± 15	NS
A (cm/s)	81 ± 16	80 ± 15	NS
Longitudinal LV (dys)	39 ± 28	30 ± 26	NS
Pre-ejection interval of LV (ms)	225 ± 24	223 ± 27	NS
IVMD (ms)	62 ± 21	61 ± 20	NS
SPMWD (ms)	71 ± 27	70 ± 26	NS