Refractory swallowing-induced paroxysmal supraventricular tachycardia.

A 51-year-old female with a two-year history of palpitations associated with swallowing was evaluated by intracardiac electrophysiologic studies. Intracardiac recordings documented the presence of an ectopic left atrial focus induced by swallowing with no evidence of accessory pathway conduction. Gastrointestinal evaluation did not demonstrate any significant disorder. The tachycardia was refractory to all pharmacologic therapy including investigational therapy with mexiletine and amiodarone.