title: Pacing techniques in the management of supraventricular tachycardias. Part 2. An implanted atrial synchronous pacemaker with a short atrioventricular delay for the prevention of paroxysmal supraventricular tachycardias.
abstract: An implanted atrial synchronous pacemaker with an atrioventricular delay of 30 msec is described. This pacemaker was implanted into a patient with paroxysmal supraventricular tachycardia due to an intra AV nodal reciprocal mechanism. The pacemaker was able to trigger from atrial potentials following atrial premature beats down to a coupling time of 300 msec. Following each triggering atrial potential, a ventricular stimulus was applied 30 msec later thereby producing a ventricular premature beat in response to each sinus beat or each atrial premature beat. Retrograde conduction from this atrial premature beat blocked the re-entry mechanism within the AV node and prevented the initiation of tachycardia. A detailed discussion on all parameters of function of this pacemaker is presented.
mesh_terms: D000200:Action Potentials; D001283:Atrioventricular Node / Q000503:physiopathology; D004562:Electrocardiography; D006325:Heart Atria / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D009203:Myocardial Infarction / Q000150:complications; D010138:Pacemaker, Artificial / Q000379:methods; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology / Q000628:therapy*