How is a right bundle branch block (RBBB)distinguished from a left bundle branch block (LBBB)?
A)Monitor lead V1. If the majority of the ventricular depolarization is positively deflected, it is RBBB; if the QRS is negative, it is LBBB
B)Monitor lead V1. If the majority of the ventricular depolarization is positively deflected, it is LBBB; if the QRS is negative, it is RBBB
C)Monitor leads V1 to V6 and measure the PR interval
D)Monitor leads I, II, and III and observe the P wave configuration

Question

Quizplus · Accepted Answer

Monitoring lead V1 is the best lead to distinguish between RBBB and LBBB based on the majority of the ventricular depolarization being positively or negatively deflected. The PR interval and P wave configuration are not reliable indicators for differentiating between RBBB and LBBB.

How Is a Right Bundle Branch Block (RBBB)distinguished from a Left