BBB

Specialties Cardiac

Published

how can I tell the difference between left and right bundle branch block

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Specializes in STICU, MICU.

a 12 lead

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Specializes in EP/Cath Lab, E.R. I.C.U, and IVR.

Check out Lead 1 and you get your answer right away.

LBBB you will see a deep rapid S wave in V1 and will almost always see a wide QRS in Lead 1.

RBBB you will see a terminal R wave in lead aVR and terminal S waves in leads I, aVL, V5 and V6

This is an excellent website with more information than you can take. Analysis and Interpretation of the Electrocardiogram

Jonathan Coleman

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Look in V1. If the QRS is wider than normal and theres a P wave and a T wave it's a bundle branch block. No find your J point. Back track to the first deflection before the Jo point. If the deflection is up, it's right sided. If its down, it's left sided.

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Specializes in Critical Care, Emergency Medicine, Flight.

wow thats a great website. really breaks it down and goes into the nitty gritty! Thanks!

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