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In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
Published on: February 16, 2016
TIMI myocardial perfusion grade and ST segment resolution: association with infarct size as assessed by single photon
Brad G Angeja1, Madhavi Gunda, Sabina A Murphy
1Department of Medicine, the University of California, San Francisco, USA.
Circulation
|January 24, 2002
Summary
Early indicators of blood flow, like TIMI myocardial perfusion grade (TMPG) and ST-segment resolution, correlate with smaller infarct sizes after acute myocardial infarction treatment.
Area of Science:
- Cardiology
- Medical Imaging
- Thrombolytic Therapy
Background:
- TIMI myocardial perfusion grade (TMPG) and ST-segment resolution assess perfusion post-thrombolysis for acute myocardial infarction.
- These measures are linked to patient mortality.
- Their association with infarct size, measured by SPECT, was investigated.
Purpose of the Study:
- To determine if TMPG and ST-segment resolution correlate with infarct size.
- To explore the relationship between early perfusion markers and myocardial damage.
Main Methods:
- Utilized data from the LIMIT AMI trial.
- Compared early 90-minute TMPG and ST-segment resolution with SPECT-derived infarct size (Technetium-99 m Sestamibi uptake).
- Analyzed infarct size based on TMPG (0-3) and ST resolution categories.
Main Results:
- Larger infarct sizes were observed with lower TMPG scores (0-1) compared to higher scores (2-3) (median 13% vs. 7%, P=0.004).
- Patients with no or incomplete ST resolution had larger infarcts than those with complete resolution (median 15% or 11% vs. 6%, P=0.0001).
- The association between TMPG and infarct size remained significant even when stratified by ST resolution.
Conclusions:
- Early restoration of tissue-level perfusion may be linked to reduced infarct size.
- These findings suggest a pathophysiological basis for the association between early perfusion markers and long-term survival after acute myocardial infarction.
