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Advanced Technical IVT

TIMI myocardial perfusion grade

Also written as: TMPG — TIMI Myocardial Perfusion Grade

A classification system assessing tissue-level perfusion after coronary intervention, distinct from epicardial flow assessment.

Full Definition

The TIMI myocardial perfusion grade (TMPG) is a standardized scoring system that evaluates microvascular perfusion at the tissue level following coronary intervention. Unlike TIMI flow grade which assesses epicardial coronary flow, TMPG focuses on contrast opacification and clearance patterns in the myocardium. The grade ranges from 0 (no perfusion) to 3 (normal perfusion), with impaired microvascular perfusion associated with worse clinical outcomes despite successful epicardial recanalization. This assessment is crucial for predicting patient prognosis and identifying cases of microvascular obstruction.

Usage

Usage note: Always specify when referring to tissue-level rather than epicardial perfusion assessment.

In Context

  • "Despite achieving TIMI 3 flow, the patient demonstrated TIMI myocardial perfusion grade 1, indicating significant microvascular dysfunction." — Catheterization laboratory report
  • "Assessment of TIMI myocardial perfusion grade provides additional prognostic information beyond epicardial flow evaluation." — Clinical research protocol

Also known as

TMPG myocardial perfusion grade

Don't confuse with

TIMI flow grade myocardial blush grade

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