Bundle Branch Blocks

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    78 year old female with heart palpitations.

    78 year old female with heart palpitations.

    Questions

    Question 1: Why do some of the QRS complexes look different than others in the rhythm strip (Lead II)?

    Question 2: What is the electrophysiological explanation for the different QRS complexes?

    Key Findings

    -Atrial fibrillation

    -Left bundle branch block

    -Left axis deviation

    Coding for the Boards

    -Atrial fibrillation

    -Left bundle branch block

    -Left axis deviation

    Answers

    Question 1: Some of the QRS complexes exhibit rate-related aberrancy

    Question 2: Phase 3 Block