ECG Question #15

Question

A nurse caring for a client on telemetry interprets the electrocardiogram (ECG) as having a bundle branch block based on the following characteristics:

Answers

  1. A narrow QRS segment
    • Rationale:
  2. A wide QRS segment
    • Rationale:
  3. An inverted PR interval
    • Rationale:
  4. A spiked PR interval
    • Rationale:

Overview

Explanation

Bundle branch block occurs when an impulse is blocked as it travels through the bundle branches. Electrical impulses travel down the right and left bundle branches at the same speed. A block in one of the branches causes the electrical impulse to travel to the ventricle via an alternate route. The ventricle still contracts; however, it will take longer and the impulse will be slower. One ventricle contracts a fraction of a second slower than the other ventricle. Blocks can be either right or left. A bundle branch block does not cause a narrow QRS segment, an inverted PR interval, or a spiked PR interval.

Learning Outcomes

Test Taking Tip

Video Rationale