'TIMI Grade Flow' is a widely adopted scoring system from 0-3 referring to levels of coronary blood flow assessed during percutaneous coronary angioplasty:
- TIMI 0 flow (no perfusion) refers to the absence of any antegrade flow beyond a coronary occlusion.
- TIMI 1 flow (penetration without perfusion) is faint antegrade coronary flow beyond the occlusion, with incomplete filling of the distal coronary bed.
- TIMI 2 flow (partial reperfusion) is delayed or sluggish antegrade flow with complete filling of the distal territory.
- TIMI 3 flow (complete perfusion) is normal flow which fills the distal coronary bed completely
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