Acquired coronary-to-left ventricle fistula: evidence by myocardial contrast echocardiography

Area of Science:

• Cardiology
• Diagnostic Imaging
• Interventional Cardiology

Background:

• Coronary artery fistulas are rare anomalies, often asymptomatic or presenting with complications like myocardial infarction or angina.
• Early diagnosis of coronary fistulas is crucial for appropriate management and prevention of adverse cardiac events.
• Conventional angiography sometimes struggles to detect very small or complex fistulous communications.

Observation:

• A patient with a history of myocardial infarction and postinfarction angina developed a small left coronary-to-left ventricle fistula over several years.
• Initial coronary angiography 4 months post-infarction did not reveal the fistula.
• Repeat cardiac catheterization 3 years later, utilizing myocardial contrast echocardiography, successfully identified the fistula.

Findings:

• Myocardial contrast echocardiography, using microbubbles injected into coronary arteries, clearly visualized contrast entering the left ventricle via the distal interventricular septum.
• Cineangiography, despite careful review, initially failed to show the fistulous communication evident with contrast echocardiography.
• This case highlights the superior sensitivity of myocardial contrast echocardiography for detecting small coronary fistulae.

Implications:

• Myocardial contrast echocardiography is a highly effective tool for diagnosing small coronary artery fistulae, especially when conventional angiography is inconclusive.
• This imaging modality can improve diagnostic accuracy in complex coronary anomalies.
• Enhanced visualization of coronary fistulae can lead to timely intervention and improved patient outcomes.