Orthodromic AVRT has what kind of QRS?

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Multiple Choice

Orthodromic AVRT has what kind of QRS?

Explanation:
In orthodromic AVRT, the impulse travels antegrade through the AV node and retrograde through the accessory pathway. This keeps ventricular activation using the heart’s normal His-Purkinje system, so the QRS complexes stay narrow (roughly under 120 ms). If the antegrade conduction used the accessory pathway (as in antidromic AVRT), the ventricles would be activated abnormally and the QRS would be wide due to preexcitation.

In orthodromic AVRT, the impulse travels antegrade through the AV node and retrograde through the accessory pathway. This keeps ventricular activation using the heart’s normal His-Purkinje system, so the QRS complexes stay narrow (roughly under 120 ms). If the antegrade conduction used the accessory pathway (as in antidromic AVRT), the ventricles would be activated abnormally and the QRS would be wide due to preexcitation.

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