Impact of Coronary Microvascular Dysfunction on Functional Left Ventricular Remodeling and Diastolic Dysfunction

Area of Science:

• Cardiology
• Cardiovascular Research
• Interventional Cardiology

Background:

• Coronary microvascular dysfunction (CMD) is a known complication following ST-segment-elevation myocardial infarction (STEMI).
• The association between CMD and subsequent functional left ventricular remodeling (FLVR) and diastolic dysfunction after STEMI remains under-investigated.

Purpose of the Study:

• To investigate the relationship between CMD, left ventricular (LV) diastolic dysfunction, and FLVR in patients with STEMI.
• To assess the impact of CMD on major adverse cardiac events (MACE) at 12-month follow-up.

Main Methods:

• A prospective, observational study involving 210 patients with STEMI and multivessel disease.
• Coronary microvascular function was assessed at 3 months post-STEMI using coronary flow reserve and index of microcirculatory resistance.
• CMD was defined by specific thresholds for these microvascular parameters.

Main Results:

• Approximately 27% of patients developed CMD at 3 months post-STEMI.
• Patients with CMD showed significantly poorer LV systolic function recovery, higher rates of LV diastolic dysfunction (73% vs 1%), and adverse FLVR compared to those without CMD at 12 months.
• CMD was independently associated with LV diastolic dysfunction and adverse FLVR, and was linked to a substantially higher incidence of MACE (50.9% vs 9.8%).

Conclusions:

• Coronary microvascular dysfunction is a prevalent complication after STEMI, affecting roughly one in four patients.
• CMD is significantly associated with adverse LV remodeling, diastolic dysfunction, and an increased risk of major adverse cardiac events within 12 months post-STEMI.