Reperfusion Injury: How Can We Reduce It by Pre-, Per-, and Postconditioning

Area of Science:

• Cardiology
• Cardiovascular Research
• Regenerative Medicine

Background:

• Acute ST-elevation myocardial infarction (STEMI) requires early reperfusion, but this can cause ischemia-reperfusion injury (IRI).
• Ischemic conditioning (IC), including remote ischemic conditioning (RIC), is a promising strategy to mitigate IRI.
• RIC involves repetitive cycles of ischemia and reperfusion, often applied non-invasively to a limb.

Purpose of the Study:

• To review the pathophysiological basis of IRI.
• To summarize preclinical and clinical data on IC's efficacy in reducing IRI.
• To highlight the potential of IC in high-risk STEMI patients.

Main Methods:

• Review of preclinical studies on ischemic conditioning (IC) and remote ischemic conditioning (RIC).
• Analysis of clinical trial data investigating the impact of IC/RIC on infarct size and myocardial injury.
• Evaluation of the effectiveness of IC/RIC in various patient cohorts, particularly high-risk STEMI patients.

Main Results:

• Preclinical studies show IC/RIC effectively reduces infarct size and myocardial injury.
• Clinical studies demonstrate reductions in enzymatic infarct size and imaging-based myocardial injury.
• The clinical outcome benefit of IC/RIC in STEMI patients has been limited thus far, though potential exists in high-risk groups.

Conclusions:

• IC, particularly RIC, is a promising approach to reduce ischemia-reperfusion injury (IRI) in acute myocardial infarction.
• While promising in preclinical and some clinical measures, the impact of IC/RIC on hard clinical outcomes requires further investigation.
• Future research should focus on high-risk STEMI populations to better define the clinical utility of IC/RIC.