Coronary Artery Fistula and Severe Coronary Artery Stenosis: A Case Report and an Insight for Potential Pathogenesis...

Area of Science:

• Cardiology
• Vascular Biology

Background:

• Coronary artery fistulae (CAF) are uncommon anomalies connecting coronary arteries to heart chambers or great vessels.
• Most patients with CAF are asymptomatic, but they are at risk for severe complications like heart failure.

Observation:

• A 46-year-old male presented with a right coronary artery (RCA) to right atrium (RA) fistula.
• The patient exhibited a severe 99% stenosis in the RCA proximal to the fistula.
• He also had six conventional cardiovascular risk factors: age, male gender, hypertension, diabetes, smoking, and hypertriglyceridemia.

Findings:

• The case illustrates "accelerating damage" and "retarding renewal" in atherosclerosis.
• Factors like shear stress, smoking, and hypertension may accelerate endothelial damage.
• Aging and diabetes might impair endothelial cell renewal and repair.

Implications:

• This case introduces the "Double Endothelial Healings" hypothesis for coronary artery atherosclerosis pathogenesis.
• It suggests a complex interplay between endothelial damage and repair mechanisms in disease progression.
• Understanding these dual processes may offer new therapeutic targets for coronary artery disease.