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University of Ottawa Heart Institute, H3401, 40 Ruskin St, Ottawa, Ontario K1Y 4W7, Canada
(Email: mboodhwani@ottawaheart.ca).
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Coronary collaterals are present in the human heart at birth and have been shown to exist in the absence of coronary disease. These vessels, in large part, remain physiologically dormant. However, in the setting of coronary artery disease, they can play a crucial role in limiting the burden of myocardial ischemia, thereby reducing the incidence and magnitude of myocardial injury. Coronary collateral reserve has been shown to be associated with a reduction in myocardial events in patients with chronic stable angina and those undergoing percutaneous coronary interventions [1].
The presence of collaterals also has important implications for
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