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Related Experiment Video

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Quantitative Autonomic Testing
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Unexplained syncope evaluated by electrophysiologic studies and head-up tilt testing.

J S Sra1, A J Anderson, S H Sheikh

  • 1Sinai Samaritan Medical Center, Milwaukee, Wisconsin.

Annals of Internal Medicine
|June 15, 1991
PubMed
Summary

Electrophysiologic studies and head-up tilt testing identify syncope causes in 74% of patients. Tailored therapies based on these diagnostic results effectively prevent recurrent syncope.

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Area of Science:

  • Cardiology
  • Clinical Electrophysiology

Background:

  • Unexplained syncope presents a diagnostic challenge.
  • Identifying the cause is crucial for effective management and preventing recurrence.

Purpose of the Study:

  • To characterize patient subgroups with unexplained syncope.
  • To evaluate the diagnostic yield of electrophysiologic studies and head-up tilt testing.
  • To assess the efficacy of therapies guided by these investigations.

Main Methods:

  • Retrospective study of 86 patients with unexplained syncope.
  • Electrophysiologic studies were performed on all patients.
  • Head-up tilt testing was conducted for patients with negative electrophysiologic results.

Main Results:

  • Electrophysiologic studies identified causes in 34% of patients (Group 1), often related to ventricular tachycardia and structural heart disease.
  • Head-up tilt testing diagnosed causes in 40% of patients (Group 2), with successful management using beta-blockers or disopyramide.
  • Syncope remained unexplained in 26% of patients (Group 3).
  • Overall, syncope recurred in 10% of patients during follow-up.

Conclusions:

  • The combined use of electrophysiologic evaluation and head-up tilt testing diagnoses the cause of syncope in up to 74% of unexplained cases.
  • Therapeutic strategies based on these diagnostic findings are effective in preventing syncope recurrence.