What is the normal QRS duration for sinus rhythm?

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Multiple Choice

What is the normal QRS duration for sinus rhythm?

Explanation:
QRS duration shows how long ventricle depolarization takes. In a normal sinus rhythm, the impulse travels rapidly through the His-Purkinje system, giving a short, narrow QRS complex. The typical normal upper limit is about 0.10 seconds (100 ms). So a QRS duration of 0.10 seconds or less is considered normal. If the QRS widens beyond this, especially around 0.12 seconds or more, it points to a conduction delay such as bundle branch block, which isn’t normal. That’s why the option stating 0.10 seconds or less is the best answer. The other ranges describe longer, abnormal QRS durations.

QRS duration shows how long ventricle depolarization takes. In a normal sinus rhythm, the impulse travels rapidly through the His-Purkinje system, giving a short, narrow QRS complex. The typical normal upper limit is about 0.10 seconds (100 ms). So a QRS duration of 0.10 seconds or less is considered normal. If the QRS widens beyond this, especially around 0.12 seconds or more, it points to a conduction delay such as bundle branch block, which isn’t normal. That’s why the option stating 0.10 seconds or less is the best answer. The other ranges describe longer, abnormal QRS durations.

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