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Author Spotlight: Enhancing Coronary Artery Revascularization
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Physiologic significance of coronary collaterals in chronic total occlusions

Minh N Vo1, Emmanouil S Brilakis2, Malek Kass1

  • 1a University of Manitoba, Section of Cardiology, St. Boniface Hospital, 409 Tache Ave., Winnipeg, MB R2H 2A6, Canada.

Canadian Journal of Physiology and Pharmacology
|August 18, 2015
PubMed

Insights

Chronic total occlusions (CTOs) involve collateral vessels that protect against heart muscle death but not exercise-induced ischemia. This review examines collateral flow evidence and clinical significance in CTO patients, challenging outdated beliefs against revascularization.

Area of Science:

  • Cardiovascular Medicine
  • Interventional Cardiology

Background:

  • Chronic total occlusions (CTOs) are prevalent in coronary artery disease patients.
  • Collateral vessels are present in most CTO patients, preventing myocardial necrosis but not ischemia during exertion.

Purpose of the Study:

  • To review the evidence for coronary collateral flow.
  • To assess the clinical significance of collateral flow in patients with CTOs.
  • To address misconceptions regarding collateral function and CTO revascularization.

Main Methods:

  • Literature review of studies on coronary collateral flow.
  • Analysis of research utilizing coronary pressure and flow velocity measurements.
  • Evaluation of the physiological significance of collateral circulation in CTOs.

Main Results:

  • Collateral vessels, while protective against necrosis, are insufficient to prevent exercise-induced myocardial ischemia.
  • Recent studies have advanced the understanding of coronary collateral physiology.
  • Evidence supports the clinical significance of collateral flow in CTO patients.

Conclusions:

  • The presence of well-developed collaterals does not negate the indication for CTO revascularization.
  • Increased knowledge of collateral physiology refutes the notion that patients are "protected" by collaterals.
  • CTO revascularization remains a critical consideration for improving outcomes in relevant patient populations.

Keywords:
angioplastieangioplastychronic total occlusionscoronaropathiecoronary artery diseaseinterventions coronariennes percutanéesocclusions totales chroniquespercutaneous coronary interventions

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