What is considered the upper limit of the normal QRS interval?

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Multiple Choice

What is considered the upper limit of the normal QRS interval?

Explanation:
The main concept is that the QRS interval shows how long ventricular depolarization takes. A normal, rapid spread of impulse through the His-Purkinje system yields a narrow QRS complex. The upper limit of normal for the QRS duration is about 120 milliseconds. So a QRS duration less than 120 ms is considered normal. If the QRS is longer than 120 ms, it suggests intraventricular conduction delay, such as a bundle-branch block or other slowed ventricular activation. In many references, a typical normal range is roughly 80–100 ms, but up to 120 ms is still within the normal upper limit.

The main concept is that the QRS interval shows how long ventricular depolarization takes. A normal, rapid spread of impulse through the His-Purkinje system yields a narrow QRS complex. The upper limit of normal for the QRS duration is about 120 milliseconds. So a QRS duration less than 120 ms is considered normal. If the QRS is longer than 120 ms, it suggests intraventricular conduction delay, such as a bundle-branch block or other slowed ventricular activation. In many references, a typical normal range is roughly 80–100 ms, but up to 120 ms is still within the normal upper limit.

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