What is the normal QRS duration?

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Study for the EPU Electrophysiology Exam with comprehensive questions and explanations. Enhance your knowledge with flashcards and a variety of question formats to ensure you are prepared to excel!

Multiple Choice

What is the normal QRS duration?

Explanation:
Normal QRS duration reflects how long ventricular depolarization takes, and it’s measured from the start of the Q wave to the end of the S wave in the lead where the QRS is widest. In a healthy heart, this depolarization happens quickly through the His-Purkinje system, so the QRS is narrow. The commonly accepted normal range is about 80 to 120 milliseconds, which is why this option is the best choice. If the QRS widens beyond 120 ms, that indicates slowed intraventricular conduction, such as a bundle-branch block. Some sources cite 60–100 ms as an alternative normal range, but many exam references use 80–120 ms as the standard.

Normal QRS duration reflects how long ventricular depolarization takes, and it’s measured from the start of the Q wave to the end of the S wave in the lead where the QRS is widest. In a healthy heart, this depolarization happens quickly through the His-Purkinje system, so the QRS is narrow. The commonly accepted normal range is about 80 to 120 milliseconds, which is why this option is the best choice. If the QRS widens beyond 120 ms, that indicates slowed intraventricular conduction, such as a bundle-branch block. Some sources cite 60–100 ms as an alternative normal range, but many exam references use 80–120 ms as the standard.

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