title: [Use of implantable pacemaker in the treatment of paroxysmal supraventricular tachycardia refractory to pharmacologic therapy].
abstract: OBJECTIVE
  To evaluate the results with the use of an automatic antitachycardia pacemaker in patients with refractory paroxysmal supraventricular tachycardia.
  
  
  METHODS
  Nine patients aged 32 to 63 years with symptoms from 2 to more than 40 years and prophylactic treatment with several antiarrhythmic drugs that had failed to control tachycardia. The frequency of attacks in the year before the implant was from 1 per month to 3 daily and 4 of patients required direct counter current cardioversion at least once. The electrophysiologic studies demonstrated atrioventricular (AV) nodal reentry in 6 and AV reentry utilizing an accessory AV connection in 4 patients (in one patient both mechanisms were present). The patients have been followed from 2 to 18 months.
  
  
  RESULTS
  All patients experienced new episodes of the arrhythmia that were successfully terminated by the pacemaker. Two patients presented episodes of tachycardia not terminated by the pacemaker. These events were successfully treated by reprogramming the unit. The drug treatment was discontinued in 7 patients.
  
  
  CONCLUSIONS
  The antitachycardia pacemaker proved to be an effective therapeutic tool in reentrant supraventricular tachycardia refractory to pharmacologic therapy.
authors.affiliation: Instituto de Cardiologia do Rio Grande do Sul, Fundação Universitária de Cardiologia do RS.
authors.forename: J R
authors.initials: JR
authors.lastname: Sant'Anna
authors.forename: C
authors.initials: C
authors.lastname: Medeiros
authors.forename: C
authors.initials: C
authors.lastname: Halperin
authors.forename: F
authors.initials: F
authors.lastname: Lucchese
authors.forename: R
authors.initials: R
authors.lastname: Kalil
authors.forename: P
authors.initials: P
authors.lastname: Prates
authors.forename: N
authors.initials: N
authors.lastname: Nonohay
authors.forename: I
authors.initials: I
authors.lastname: Nesralla
mesh_terms: D000328:Adult; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D005500:Follow-Up Studies; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013614:Tachycardia, Paroxysmal / Q000628:therapy*; D013617:Tachycardia, Supraventricular / Q000628:therapy*
vernacular_title: Uso de marcapasso implantável no tratamento da taquicardia supraventricular paroxística refratária à terapêutica farmacológica.