EKG Question #17

Question

On the electrocardiogram, which complex indicates both ventricular depolarization and repolarization?

Answers

  1. QT interval
    • Rationale:
  2. PR interval
    • Rationale:
  3. QS interval
    • Rationale:
  4. R-R interval
    • Rationale:

Overview

Explanation

The QT interval represents the time of ventricular activity including both depolarization and repolarization and is measured from the beginning of the QRS complex to the end of the T wave. The QT interval is between 0.36 – 0.44 or approximately 9-11 small boxes. The QT interval varies with gender, age, heart rate, medical condition, and may vary are a result of medication adverse side effects.

Learning Outcomes

Test Taking Tip

Video Rationale