Mechanisms of myocardial infarction without obstructive coronary artery disease

Area of Science:

• Cardiology
• Internal Medicine
• Pathophysiology

Background:

• Angiography in myocardial infarction (MI) patients frequently shows significant coronary artery narrowing.
• A notable percentage of spontaneous MI cases lack obstructive coronary artery disease (CAD) upon angiography.

Purpose of the Study:

• To review and summarize evidence for hypothesized mechanisms of MI without obstructive CAD.
• To discuss conditions such as tako-tsubo syndrome and myocarditis in the context of MI without obstructive CAD.
• To highlight the need for tailored treatments based on the underlying cause of MI without obstructive CAD.

Main Methods:

• Literature review of evidence for hypothesized mechanisms of MI without obstructive CAD.
• Inclusion of plaque disruption, plaque erosion, vasospasm, embolism, and spontaneous coronary dissection as key mechanisms.
• Discussion of related conditions like tako-tsubo syndrome and myocarditis.

Main Results:

• Several mechanisms are hypothesized for MI without obstructive CAD, including plaque disruption, erosion, vasospasm, embolism, and spontaneous coronary dissection.
• Tako-tsubo syndrome and myocarditis are also considered in the differential diagnosis.
• The optimal treatment strategy for MI without obstructive CAD is likely dependent on the specific underlying etiology.

Conclusions:

• MI without obstructive CAD encompasses a range of underlying causes.
• Accurate diagnosis of the specific mechanism is essential for guiding appropriate therapeutic interventions.
• Further research is required to establish evidence-based treatment guidelines for these patients.