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Effects of isolated coronary artery ectasia on electrocardiographic parameters reflecting ventricular heterogeneity

Osman Karakaya1, Mustafa Saglam, Irfan Barutcu

  • 1Department of Cardiology, Kosuyolu Heart Education and Research Hospital, Istanbul, Turkey.

Journal of Electrocardiology
|April 25, 2006
PubMed

Insights

Coronary artery ectasia (CAE) is linked to prolonged QT intervals and increased QT dispersion, suggesting potential microvascular dysfunction or ischemia. This finding highlights a significant association in patients with this rare coronary anomaly.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Coronary Artery Disease

Background:

  • Coronary artery ectasia (CAE) is an infrequent angiographic finding characterized by dilated, ectatic epicardial coronary arteries.
  • The impact of isolated CAE on cardiac electrical activity, specifically QT interval parameters, remains incompletely understood.

Purpose of the Study:

  • To investigate whether coronary artery ectasia (CAE) is associated with alterations in QT interval duration and dispersion.
  • To compare electrocardiographic parameters between patients with isolated CAE and a control group.

Main Methods:

  • A study population of 24 patients with isolated CAE and 24 age- and sex-matched controls with normal coronary arteries was recruited.
  • Standard 12-lead surface electrocardiograms were recorded at rest to calculate QT dispersion (QTd), corrected QT (QTc), and corrected QT dispersion (QTcd).

Main Results:

  • Patients with isolated CAE exhibited significantly higher QTd, QTcd, and QTc compared to the control group.
  • Mean heart rate, age, sex distribution, BMI, and cardiac risk factors were similar between the groups, indicating CAE as the primary differentiating factor.

Conclusions:

  • Coronary artery ectasia (CAE) is associated with a prolonged QT interval and increased QT dispersion.
  • Potential underlying mechanisms include microvascular dysfunction and/or myocardial ischemia in patients with CAE.

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