title: A case report demonstrating spontaneous change in tachycardia terminating window.
abstract: A patient who received a patient-activated pacemaker system for termination of paroxysmal, drug-resistant, ventricular tachycardia is described. During the pre-implant invasive electrophysiological (EP) study and the three post-implant non-invasive EP studies, tachycardias were easily and reproducibly terminated by two stimuli using the interval scanning mode. On the fourth day post-implant, this pacing mode no longer terminated tachycardia at rest. A new pacing mode using more stimuli was then found to terminate the tachycardia reproducibly under various physiological conditions. This case report demonstrated a spontaneous change in the tachycardia terminating window and the usefulness of versatility in antitachycardia pacemaker systems.
mesh_terms: D002304:Cardiac Pacing, Artificial / Q000379:methods; D004562:Electrocardiography; D004594:Electrophysiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology* / Q000628:therapy