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

Table 4 Receiver operating characteristic analysis of ECG variables to identify LVSD in LBBB_pEF

Variables	AUC (95% CI)	P-value	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	LR+	LR-
QRS duration	0.75(0.66–0.83)	<0.001	75.00	72.88	70.9	76.8	2.77	0.34
Presence of QS	0.65(0.55–0.73)	<0.001	73.08	55.93	59.4	70.2	1.66	0.48
Discordant LBBB*	0.68(0.58–0.76)	<0.001	71.15	64.41	63.8	71.7	2.00	0.45
QRS duration + Presence of QS	0.78(0.69–0.85)	<0.001	59.62	86.44	79.5	70.8	4.40	0.47
QRS duration + Discordant LBBB	0.79(0.71–0.86)	<0.001	80.77	72.88	72.4	81.1	2.98	0.26
QRS duration + Presence of QS + Discordant LBBB	0.82(0.74–0.89)	<0.001	80.77	81.36	79.2	82.8	4.33	0.24

Abbreviations: LVSD left ventricle systolic dysfunction, LBBB left bundle branch block
* Discordant LBBB T-wave orientation discordant with QRS complex in leads I, V5, and V6

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