The Role of Electrophysiologic Studies in the Management of Patients with Unexplained Syncope


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34 Scopus citations


We evaluated the frequency and type of electrophysiologic abnormalities in an unselected population of consecutive patients with unexplained syncope. Fifty patients were entered in the study; all had 24‐hour dynamic electrocardiographs (Holter) recordings and underwent complete electrophysiological studies. An abnormal electrophysiologic study was found in 74% of the patients. Sinus node abnormality was observed in 30%, abnormal AV node function in 14%, long HV in 10%, block distal to H during rapid atrial pacing in 6%, paroxysmal supraventricular tachycardia in 12%, ventricular tachycardialfibrillation in 8%, and hypersensitive carotid sinus syndrome in 24%. There was no correlation between Holter and electrophysiologic study findings except for the presence of paroxysmal sustained supraventricular tachycardia. Based on clinical, Holter monitoring, and electrophysiologic findings, 38% were treated by antiarrhythmic drugs, 40% received permanent pacemakers, and. 22% were not treated at all. During follow‐up (23 ± 13 months), 9 patients (18%) experienced recurrent syncope or death.

Original languageEnglish (US)
Pages (from-to)424-435
Number of pages12
JournalPacing and Clinical Electrophysiology
Issue number3
StatePublished - Jan 1 1985


  • antiarrhythmic drugs
  • electrophysiology study
  • Holter recording
  • pacing
  • syncope

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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