WolffParkinsonWhite syndrome and persistent azygous drainage of the inferior vena cava.

A 33-year old man with a history of transient palpitations presented to casualty with sustained tachycardia. His ECG showed pre-excited atrial fibrillation, with a left-sided accessory pathway. He was cardioverted to sinus rhythm, and transferred for electrophysiological treatment. A quadrupolar lead was advanced from the right femoral vein under fluoroscopy, and it was noted that despite …