Rentrop and Cohen’s Collateral Classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Overview

Angiographic assessment of apparent collaterals is useful to quantify the angiogenic response to interventions designed to enhance myocardial perfusion and function in ischemic myocardium.

• Grade 0: No collateral's present.

• Grade 1: Barely detectable coronary flow. Contrast medium passes through collateral channels but fails to opacify the epicardial vessels at any time.

• Grade 2: Partial collateral flow. Contrast material enters but fails to opacify the target epicardial vessel completely.

• Grade 3: Complete perfusion. Contrast material enters and completely opacifies the target epicardial vessel.

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