The Association between Hypoperfused Myocardium and Systolic Function in Patients With AMI Undergoing Complete...

Area of Science:

• Cardiology
• Medical Imaging
• Myocardial Reperfusion Injury

Background:

• Restoring coronary blood flow in acute myocardial infarction (AMI) is crucial for reducing mortality.
• Epicardial blood flow restoration does not always parallel myocardial reperfusion.
• This study investigates myocardial perfusion dynamics and left ventricular (LV) function post-revascularization.

Purpose of the Study:

• To examine temporal changes in myocardial perfusion after complete revascularization in AMI patients.
• To assess the association between myocardial perfusion and LV systolic function.
• To identify predictors of persistent hypoperfusion and its impact on cardiac function.

Main Methods:

• Prospective study of 55 AMI patients treated with complete revascularization.
• Hybrid positron emission tomography/magnetic resonance imaging (PET/MR) performed at 2 months and 1 year post-procedure.
• Hypoperfused myocardium defined as reduced perfusion with preserved metabolism.

Main Results:

• 45.5% of patients had hypoperfused myocardium at 2 months post-AMI.
• Higher hs-CRP and lower T2 values predicted baseline hypoperfusion.
• At 1 year, hypoperfusion reversal in some patients correlated with female sex, lower diabetes/overweight prevalence, and better baseline global longitudinal strain (GLS).
• Significant LV ejection fraction improvement observed in patients with hypoperfusion reversal (Group A), but not in those without (Group B).

Conclusions:

• Myocardial hypoperfusion can persist and evolve over time even after complete revascularization in AMI patients.
• Reversal of myocardial hypoperfusion is associated with improved LV systolic function.
• These findings highlight the importance of assessing myocardial perfusion beyond epicardial flow restoration.