What is the maximum normal duration for the QRS complex?

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Multiple Choice

What is the maximum normal duration for the QRS complex?

Explanation:
QRS duration shows how long ventricular depolarization takes. Because the impulse travels quickly through the His-Purkinje system, a normal QRS is narrow. In adults, a QRS lasting up to about 0.12 seconds (120 milliseconds) is considered normal. If the duration is longer than this, it indicates slowed intraventricular conduction, such as a bundle-branch block or a ventricular-originating rhythm. Short durations around 0.08 seconds are typical of normal conduction, while durations near 0.16 or 0.20 seconds are clearly prolonged and require evaluation. So, the maximum normal duration is 0.12 seconds.

QRS duration shows how long ventricular depolarization takes. Because the impulse travels quickly through the His-Purkinje system, a normal QRS is narrow. In adults, a QRS lasting up to about 0.12 seconds (120 milliseconds) is considered normal. If the duration is longer than this, it indicates slowed intraventricular conduction, such as a bundle-branch block or a ventricular-originating rhythm. Short durations around 0.08 seconds are typical of normal conduction, while durations near 0.16 or 0.20 seconds are clearly prolonged and require evaluation. So, the maximum normal duration is 0.12 seconds.

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