I'm trying to understand something about ECG readings. In a normal person, when you look at the R wave in the V3 and V4 chest leads, is it due to major ventricular depolarization or septal depolarization? I could really use some help figuring this out.

Answered by 1 Apollo Doctors

Dr Dhankecha Dineshbhai

General Practitioner

MBBS
6+ Yrs

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In a normal person, the R wave in V3 and V4 chest leads is primarily due to major ventricular depolarization. This is a normal electrical activity of the heart during the cardiac cycle.

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Answered 04/07/2025

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