Myocardium selective densitometric perfusion assessment after acute myocardial infarction

Area of Science:

• Cardiology
• Medical Imaging
• Biomedical Engineering

Background:

• Myocardial perfusion is a critical prognostic factor in acute myocardial infarction (AMI) patients post-recanalisation.
• Assessing myocardial perfusion is vital for determining treatment efficacy and patient outcomes.
• Current methods may lack precision or real-time feedback during interventions.

Purpose of the Study:

• To introduce and validate a novel computerized densitometric method for assessing myocardial perfusion.
• To evaluate the G(max)/T(max) parameter derived from time-density curves (TDCs) on coronary angiograms.
• To compare this novel method with established clinical and biochemical markers of reperfusion.

Main Methods:

• Quantitative myocardial perfusion was assessed using the G(max)/T(max) parameter from TDCs in infarct-related myocardial regions.
• Coronary arteries were masked to isolate myocardial measurements on X-ray coronary angiograms.
• The method was validated against enzymatic infarct size, ST-segment resolution, and ejection fraction in 62 AMI patients.

Main Results:

• The G(max)/T(max) parameter showed significant correlations with enzymatic infarct size (R=-0.445, P<.001), ST-segment resolution (R=0.364, P=.004), and ejection fraction (R=0.278, P=.029).
• Bland and Altman analysis confirmed good interobserver agreement for the G(max)/T(max) measurements.
• The method provides a reliable quantitative assessment of myocardial reperfusion.

Conclusions:

• The G(max)/T(max) parameter derived from TDCs is a reliable indicator of myocardial reperfusion in AMI patients.
• This method allows for immediate assessment of recanalisation success at the tissue perfusion level during coronary interventions.
• The G(max)/T(max) parameter can serve as an objective endpoint in clinical trials for new interventional devices and drugs.