Abstract
A 33-year-old woman presented with an atypical arrhythmia. The electrophysiologic study revealed dual atrioventricular nodal pathways. The difference in conductivity of these tracts enabled simultaneous atrioventricular conduction with a double ventricular response to a single atrial impulse. This disturbance is uncommon. Lack of awareness of the existence of dual nodal pathway can cause diagnostic difficulties and therapeutic errors.
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