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[Sinus node function evaluated by spontaneous atrial premature contractions].

S Yoshida1, A Fujiki, M Tani

  • 1Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University.

Journal of Cardiology
|March 1, 1989
PubMed
Summary
This summary is machine-generated.

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Premature atrial contractions (APC) can indicate sinus node dysfunction. The return cycle minus sinus cycle (RC-SC) interval offers a simple method for detecting sinus dysfunction, with values over 0.30 seconds suggesting potential issues.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Context:

  • Sinus node dysfunction is a common clinical concern.
  • Evaluating sinus node function often involves complex electrophysiological studies.
  • Premature atrial contractions (APC) are frequently observed in 24-hour Holter ECGs.

Purpose:

  • To evaluate sinus node function using spontaneous premature atrial contractions (APC).
  • To assess the utility of the return cycle minus sinus cycle (RC-SC) interval as a simple measure of sinus node conduction time (SACT) and automaticity.
  • To correlate RC-SC with established measures of sinoatrial conduction time (SACT) and categorize patients based on sinus node function.

Summary:

  • Thirty-three patients with >10 APCs in 24-hour Holter ECG underwent SACT measurement using Strauss' method.

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  • The RC-SC interval was measured and correlated with SACT, showing a significant positive correlation (r=0.69).
  • Patients were grouped by SACT and corrected sinus recovery time (CSRT) ranges, with increasing mean and maximum RC-SC values observed in groups with more significant sinus node dysfunction.

    • Impact:

    • The RC-SC interval provides a simpler method for detecting sinus node dysfunction compared to traditional SACT measurements.
    • RC-SC reflects both SACT and sinus node automaticity, offering a more comprehensive assessment.
    • An RC-SC greater than 0.30 seconds may indicate the presence of sinus dysfunction, aiding in clinical diagnosis.