"No-Reflow" Phenomenon: A Contemporary Review

Area of Science:

• Cardiology
• Interventional Cardiology
• Vascular Biology

Background:

• Primary percutaneous coronary intervention (pPCI) is the recommended reperfusion strategy for ST-elevation myocardial infarction (STEMI) per European Society of Cardiology guidelines.
• Coronary no-reflow (NR) is defined by slow or absent coronary blood flow without mechanical obstruction, leading to impaired myocardial perfusion.
• NR involves functional and structural changes in the coronary microcirculation.

Purpose of the Study:

• To provide a contemporary overview of the pathogenesis, diagnosis, and treatment of coronary no-reflow.
• To elucidate the pathophysiological mechanisms underlying NR.
• To summarize current management strategies for NR.

Main Methods:

• Literature review of current international guidelines and research on coronary no-reflow.
• Analysis of pathophysiological mechanisms including distal embolization, ischemic damage, reperfusion injury, and individual susceptibility.
• Synthesis of diagnostic criteria and therapeutic approaches for NR.

Main Results:

• Identified four primary pathophysiological mechanisms contributing to NR: distal atherothrombotic embolization, ischemic damage, reperfusion injury, and individual susceptibility.
• Highlighted the importance of understanding microcirculatory alterations in NR.
• Emphasized the need for effective diagnostic and therapeutic strategies.

Conclusions:

• Coronary no-reflow is a complex microcirculatory dysfunction complicating STEMI treatment.
• Understanding the multifaceted pathogenesis of NR is crucial for developing targeted therapies.
• Further research is needed to optimize the diagnosis and management of NR to improve patient outcomes.