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Atrial fibrillation in Wolff-Parkinson-White syndrome.

Atrial fibrillation in Wolff-Parkinson-White syndrome.
Atrial fibrillation in Wolff-Parkinson-White syndrome.

Ventricular response is very fast (RR intervals minimum of 160 msec). Shortly thereafter, ventricular fibrillation develops (lead II continuous rhythm strip at bottom).