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Impact of coronary collateral circulation on QT dispersion in patients with coronary artery disease

Izzet Tandogan1, Halil Aslan, Yuksel Aksoy

  • 1Department of Cardiology, Faculty of Medicine, Cumhuriyet University, Sivas, Turkey. izzet@tandogan.tr.tc

Coronary Artery Disease
|October 19, 2006
PubMed

Insights

Coronary collateral circulation (CCC) in coronary artery disease did not decrease QT dispersion (QTD). Instead, patients with well-developed CCC showed higher QTD, suggesting a need for further research.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Coronary Artery Disease

Background:

  • Prolonged QT dispersion (QTD) indicates ventricular repolarization heterogeneity, linked to arrhythmias and poor prognosis in coronary artery disease.
  • Coronary collateral circulation (CCC) is a compensatory mechanism in obstructive coronary artery disease.

Purpose of the Study:

  • To investigate the relationship between coronary collateral circulation (CCC) and QT dispersion (QTD) in patients with coronary artery disease.

Main Methods:

  • Assessed CCC and corrected QT dispersion (QTcD) in patients with significant stenosis in major coronary arteries.
  • Determined left ventricular function score for all participants.

Main Results:

  • Patients with CCC (grade ≥1) exhibited significantly higher mean QTcD compared to those without (grade 0).
  • A significant positive correlation was found between collateral score and QTcD.
  • Higher left ventricular function scores were observed in patients with CCC, and these scores correlated with QTcD.

Conclusions:

  • CCC in chronic coronary artery disease was not found to reduce QTcD; in fact, higher QTcD was observed with developed CCC.
  • Further research with larger cohorts and long-term follow-up is necessary to elucidate this complex relationship.
Abstract

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