Therapy Efficacy of Idiopathic Ventricular Extrasystoles: A Real Life Study

Table 3

Interpretation of ECG [8, 9].

Site of origin	BBB	Precordial transition	Lead I	Lead V1	Other specific criteria
RVOT	LBBB	V3–V6	Missing S waves	RS or QS
Anterior wall	LBBB	V4–V6	Dominant R waves	Deeper S waves	Wider QRS > 140 ms, notching
Septum	LBBB	V3-V4	QS	Smaller S waves
LVOT	RBBB or atypical LBBB	V1–V3	S waves can be present
AMC	RBBB, rarely LBBB	V2-V3	rS	qR	RS pattern in lead V2
LCC	RBBB	V1-V2			R wave amplitude lead III/lead II > 0.9
RCC	LBBB	V2-V3	QS		R wave amplitude lead III/lead II < 0.9

BBB, bundle branch block; RVOT, right ventricular outflow tract; LVOT, left ventricular outflow tract; AMC, aortomitral continuity; LCC, left coronary cusp; RCC, right coronary cusp.