BBB

What is the duration of the QRS in a Left bundle branch block (LBBB)?

QRS > 0.12 seconds Less than or equal to 0.12 seconds 3 small boxes or less

What is Right bundle branch block (RBBB) QRS duration?

QRS >12 seconds 4 small boxes or more

In a LBBB what is found in lead I and V6 ?

Broad monomorphic R waves in lead I and V6 with no Q waves

In a LBBB what is found in V1?

Broad monomorphic S waves in V1 may have a small r wave

What does it mean if V1 is positive?

It is a right sided issue

In a RBBB what is found in V1

RSR or notched R

What is found in lead I and V6 with a RBBB?

Slurred S wave