Relationship between electrocardiographic characteristics and subclinical left ventricular systolic dysfunction in isolated left bundle branch block patients

Table 2 ECG characteristics according to the presence of LVSD in LBBB_pEF

Variables	LBBB with GLS>-20% N = 52	LBBB with GLS ≤ -20% N = 59	P- value
QRS duration, ms	159.6 ± 10.2	150.1 ± 12.1	< 0.001
PR duration, ms	165.7 ± 22.0	166.0 ± 19.7	0.94
QTC duration, ms	480.4 ± 27.1	472.2 ± 31.1	0.14
Notching R-wave in leads I and aVL, n (%)	37 (71.2)	35 (59.3)	0.23
Notching R-wave in leads V5 and V6, n (%)	33 (63.5)	31 (52.5)	0.26
Notching R-wave in leads inferior, n (%)	22 (42.3)	31 (52.5)	0.34
Number of leads with notching R-wave	3.5 ± 1.3	2.9 ± 1.1	0.20
Presence of QS, n (%)	38 (73.1)	26 (44.1)	0.002
Discordant LBBB*, n (%)	37 (71.2)	21 (35.6)	< 0.001

Data are presented as mean ± SD or percentage
Abbreviations: GLS global longitudinal strain, LVSD left ventricle systolic disfunction, LBBB left bundle branch block
* Discordant LBBB T-wave orientation discordant with QRS complex in leads I, V5, and V6

ISSN: 1476-7120