Remote ischaemic conditioning in ST elevation myocardial infarction: a registry-based randomised trial

Area of Science:

• Cardiology
• Interventional Cardiology
• Regenerative Medicine

Background:

• Reperfusion injury is a significant complication in ST-elevation myocardial infarction (STEMI) patients treated with primary percutaneous coronary intervention (PPCI).
• Remote ischaemic conditioning (RIC) has emerged as a potential strategy to mitigate this injury, but clinical evidence remains inconsistent.
• Previous studies utilizing surrogate outcomes have shown variable effects, lacking direct correlation with clinical benefit.

Purpose of the Study:

• To evaluate the efficacy of RIC as an adjunctive therapy in STEMI patients undergoing PPCI.
• To assess the impact of RIC on myocardial perfusion, infarct size, and left ventricular (LV) performance.
• To determine the effect of RIC on major adverse clinical outcomes at one year.

Main Methods:

• A registry-based randomized study involving 252 STEMI patients undergoing PPCI.
• Patients were allocated to either RIC (four cycles of ischemia/reperfusion) or standard of care (SOC).
• Core laboratory measurements of myocardial perfusion, infarct size (IS), LV dimensions, and ejection fraction via cardiovascular MRI were assessed at 3 and 90 days, alongside 1-year clinical outcomes.

Main Results:

• No significant difference in Sum ST segment deviation resolution (≥50%) between RIC and SOC groups (65.2% vs 55.7%, p=0.269).
• Cardiovascular MRI at 3 and 90 days showed no difference in median infarct size, LV dimensions, or ejection fraction between groups.
• One-year clinical composite outcomes (death, heart failure, cardiogenic shock, recurrent MI) were similar between RIC and SOC (21.7% vs 13.3%, p=0.110).

Conclusions:

• Adjunctive RIC therapy did not improve myocardial perfusion, reduce infarct size, or alter left ventricular performance in STEMI patients undergoing PPCI.
• The study found no significant difference in clinical outcomes at one year for patients receiving RIC compared to standard care.
• These findings suggest RIC may not be an effective strategy for reducing reperfusion injury or improving clinical outcomes in this patient population.