Plaque volume and occurrence and location of periprocedural myocardial necrosis after percutaneous coronary...

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiovascular Imaging

Background:

• Myocardial necrosis can occur during percutaneous coronary intervention (PCI) despite optimal medical therapy and technique.
• Investigating the mechanisms of procedural infarction is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate the mechanisms of myocardial infarction occurring during percutaneous coronary intervention (PCI).
• To differentiate between adjacent and distal myocardial necrosis post-PCI using advanced imaging techniques.

Main Methods:

• Utilized a combination of angiography, intravascular ultrasound (IVUS), and delayed-enhancement magnetic resonance imaging (DE-MRI).
• Analyzed 52 patients (64 vessels) undergoing complex PCI, assessing plaque volume reduction and myocardial enhancement patterns.
• Correlated imaging findings with procedural characteristics like microvasculature perfusion and side branch occlusion.

Main Results:

• Fifteen vessels (23%) showed new myocardial hyperenhancement post-PCI, with 8 (12%) classified as distal and 7 (11%) as adjacent.
• Distal hyperenhancement was significantly associated with greater plaque volume reduction (P < 0.001) and closed microvasculature (P = 0.02).
• Adjacent hyperenhancement was linked to side-branch occlusion (P < 0.001).

Conclusions:

• Distal embolization of plaque material is a significant contributor to myocardial necrosis in contemporary PCI.
• Strategies to minimize procedural infarction should consider side branch anatomy and potential use of distal protection devices.
• Further research into preventing plaque embolization during PCI is warranted.