Nonatherosclerotic causes of acute coronary syndrome: recognition and management

Area of Science:

• Cardiology
• Internal Medicine
• Vascular Medicine

Background:

• Acute coronary syndromes (ACS) are often linked to vulnerable plaque rupture and thrombosis.
• However, ACS can occur with angiographically normal coronary arteries, sometimes masking silent atherosclerosis or nonatherosclerotic causes.
• Nonatherosclerotic coronary artery disease (NA-CAD) encompasses diverse etiologies leading to ACS.

Purpose of the Study:

• To review diagnostic approaches for ACS in the context of NA-CAD.
• To discuss current evidence on treatment strategies for NA-CAD-related ACS.
• To differentiate NA-CAD from typical atherosclerotic ACS.

Main Methods:

• Review of current evidence on diagnostic and treatment strategies.
• Analysis of etiologies including coronary spasm, embolism, Kounis syndrome, Takotsubo cardiomyopathy, drug use, spontaneous coronary artery dissection, and intramural hematoma.
• Emphasis on intracoronary imaging for detecting subtle atherosclerotic changes.

Main Results:

• NA-CAD presents with diverse mechanisms, including coronary spasm, embolic phenomena, allergic reactions (Kounis syndrome), and structural abnormalities.
• Intracoronary imaging can reveal subtle atherosclerotic disease in some patients with initially normal-appearing arteries.
• Younger patients may develop ACS due to illicit drug use or spontaneous coronary artery dissection.

Conclusions:

• Accurate diagnosis of NA-CAD is crucial for appropriate management of ACS.
• Treatment strategies must be tailored to the specific underlying cause of NA-CAD.
• Further research is needed to optimize diagnostic and therapeutic interventions for NA-CAD-related ACS.