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Electrophysiologic evaluation of extrinsic and intrinsic sinus node dysfunction

E Caraşca1, D Dobreanu, C Duşa

  • 1Third Medical Clinic, University of Medicine and Pharmacy 1, Târgu-Mureş, Romania.

Romanian Journal of Internal Medicine = Revue Roumaine De Medecine Interne
|July 1, 1996
PubMed
Summary

Electrophysiologic testing helped identify sick sinus syndrome (SSS) in patients. Autonomic blockade differentiated extrinsic from intrinsic sinus node dysfunction, guiding pacemaker implantation for intrinsic cases.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Sick sinus syndrome (SSS) presents with diverse clinical and electrocardiogram (ECG) findings.
  • Accurate diagnosis of SSS is crucial for appropriate patient management.

Purpose of the Study:

  • To investigate the utility of electrophysiologic studies in diagnosing sick sinus syndrome.
  • To differentiate between extrinsic and intrinsic sinus node dysfunction using autonomic blockade.

Main Methods:

  • Electrophysiologic investigation was performed on ten patients meeting clinical and ECG criteria for SSS.
  • Sinus node function was assessed using corrected sinus node recovery time (CSNRT) and sinoatrial conduction time (SACT).
  • Autonomic blockade (AB) was achieved using intravenous propranolol and atropine.

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Main Results:

  • Four patients with normal electrophysiologic parameters pre-AB were excluded from the SSS diagnosis.
  • Three patients exhibited extrinsic sinus node dysfunction, with normalized CSNRT and SACT post-AB.
  • Two patients demonstrated intrinsic sinus node dysfunction, necessitating pacemaker implantation.

Conclusions:

  • Electrophysiologic studies, particularly after autonomic blockade, are valuable in diagnosing sick sinus syndrome.
  • Autonomic blockade effectively distinguishes extrinsic from intrinsic sinus node dysfunction.
  • Intrinsic sinus node dysfunction identified through these methods warrants pacemaker implantation.