Which of the following describes QRS duration in a normal sinus rhythm?

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Multiple Choice

Which of the following describes QRS duration in a normal sinus rhythm?

Explanation:
QRS duration shows how long ventricular depolarization takes. In a normal sinus rhythm, the impulse moves quickly through the His-Purkinje system, so the QRS complex is narrow. The widely accepted upper limit of normal is 0.10 seconds (100 ms), so describing the QRS duration as “0.10 seconds or less” best captures normal conduction. Durations like 0.12–0.20 seconds or 0.14–0.22 seconds indicate some delay in ventricular conduction, such as bundle branch blocks or other abnormalities. Even though a range like 0.08–0.10 seconds falls within normal, the simple cutoff “0.10 seconds or less” is the standard, concise way to express normal QRS duration.

QRS duration shows how long ventricular depolarization takes. In a normal sinus rhythm, the impulse moves quickly through the His-Purkinje system, so the QRS complex is narrow. The widely accepted upper limit of normal is 0.10 seconds (100 ms), so describing the QRS duration as “0.10 seconds or less” best captures normal conduction. Durations like 0.12–0.20 seconds or 0.14–0.22 seconds indicate some delay in ventricular conduction, such as bundle branch blocks or other abnormalities. Even though a range like 0.08–0.10 seconds falls within normal, the simple cutoff “0.10 seconds or less” is the standard, concise way to express normal QRS duration.

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