Q:

A 27-year-old surgery resident has had multiple episodes of supraventricular tachycardia (SVT) and on EP study is felt to have WPW syndrome. The following is/are true:

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A 27-year-old surgery resident has had multiple episodes of supraventricular tachycardia (SVT) and on EP study is felt to have WPW syndrome. The following is/are true: 


  1. The pathophysiology of WPW is a single bundle of Kent
  2. Dangerous ventricular responses in WPW are due to the shorter refractory period of the accessory pathway
  3. Identification of the accessory pathway of WPW is an indication for its interruption
  4. Approximately half of the patients who have successful division of accessory pathways demonstrate VA block postop
  5. Both radiofrequency catheter and surgical ablation offer excellent results with low morbidity

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b. Dangerous ventricular responses in WPW are due to the shorter refractory period of the accessory pathway

d. Approximately half of the patients who have successful division of accessory pathways demonstrate VA block postop

e. Both radiofrequency catheter and surgical ablation offer excellent results with low morbidity

The pathophysiology of WPW is the Kent bundle of which 10–20% are multiple rather than single. The shorter refractory periods permit rapid and dangerous ventricular responses to atrial flutter or fibrillation. In 0.25% of the population, accessory pathways of WPW can be identified, but in the absence of a history of SVT, they have a normal life expectancy. Approximately half the patients who have successful division of accessory pathways demonstrate VA block postop. Both radiofrequency catheter and surgical ablation offer excellent results with low morbidity and the catheter technique is less costly.

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