Thrombolysis in myocardial infarction (TIMI) flow grading system

Grade 0 - Complete occlusion of the infarct-related artery

Grade 1 - Some penetration of contrast material beyond the point of obstruction but without perfusion of the distal coronary bed

Grade 2 - Perfusion of the entire infarct vessel into the distal bed but with delayed flow compared with a normal artery

Grade 3 - Full perfusion of the infarct vessel with normal flow

TIMI_flow_grades.htm

From Chesebro JH, Knatterud G, Roberts R, et al. Thrombolysis in Myocardial Infarction (TIMI) Trial, Phase I: A comparison between intravenous tissue plasminogen activator and intravenous streptokinase. Clinical findings through hospital discharge. Circulation 1987; 76:142.

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Thrombolysis in myocardial infarction (TIMI) flow grading system