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Coronary collateral circulation.

T J Pellinen1, K S Virtanen, L Toivonen

  • 1First Department of Medicine, Helsinki University Central Hospital, Finland.

Clinical Cardiology
|February 1, 1991
PubMed
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Coronary collateral circulation, vital for heart health, is more prevalent with greater artery obstruction. Collaterals improve left ventricular function and reduce myocardial infarction risk, but don't impact exercise test ST-segment response.

Area of Science:

  • Cardiology
  • Vascular Biology
  • Clinical Investigation

Background:

  • Coronary artery disease (CAD) involves atherosclerosis leading to arterial narrowing or occlusion.
  • Coronary collateral circulation (CCC) represents an alternative blood supply pathway to the myocardium.
  • The role of CCC in mitigating the effects of obstructive CAD is an area of ongoing research.

Purpose of the Study:

  • To investigate the occurrence and influence of CCC in patients with angiographically confirmed CAD.
  • To assess the impact of CCC on left ventricular (LV) contractility, myocardial infarction (MI) prevalence, and exercise tolerance.

Main Methods:

  • A random sample of 286 patients with documented CAD was analyzed.
  • Coronary angiography was used to assess coronary artery obstruction and collateralization.

Related Experiment Videos

  • LV contractility, MI prevalence, and bicycle ergometer test results were evaluated in relation to CCC.

    • Main Results:

    • CCC prevalence increased with the grade of coronary artery obstruction, most frequent in the right coronary artery (60%) and least in the left circumflex artery (21%).
    • Intra-arterial collateral circulation was observed in 42% of cases.
    • Presence of collaterals was associated with preserved LV contractility in cases of total left anterior descending artery occlusion and a lower prevalence of inferior MI with right coronary artery occlusion.

    Conclusions:

    • CCC is a significant compensatory mechanism in obstructive CAD, varying by artery.
    • Collateralization can preserve LV function and reduce MI extent, particularly with right coronary artery occlusion.
    • CCC did not significantly influence ST-segment response during exercise but improved peak work capacity in triple-vessel disease when not compromised.