In atrial fibrillation, what is the QRS duration?

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Multiple Choice

In atrial fibrillation, what is the QRS duration?

Explanation:
QRS duration shows how long ventricular depolarization takes. In atrial fibrillation the issue is in the atria, while the ventricles typically respond through the normal conduction system. That means the QRS complexes stay narrow, reflecting normal ventricular depolarization timing, unless there’s an additional conduction abnormality like a bundle-branch block. So the usual description is normal QRS duration, less than 0.10 seconds. Prolonged or wide QRS would indicate a ventricular conduction delay or block, and variable QRS duration isn’t a characteristic finding of atrial fibrillation.

QRS duration shows how long ventricular depolarization takes. In atrial fibrillation the issue is in the atria, while the ventricles typically respond through the normal conduction system. That means the QRS complexes stay narrow, reflecting normal ventricular depolarization timing, unless there’s an additional conduction abnormality like a bundle-branch block. So the usual description is normal QRS duration, less than 0.10 seconds. Prolonged or wide QRS would indicate a ventricular conduction delay or block, and variable QRS duration isn’t a characteristic finding of atrial fibrillation.

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