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[Evaluation of coronary artery fistula using a color Doppler flow imaging technique]
Insights
Color Doppler flow imaging reliably detects coronary artery fistulas. Combining color Doppler with continuous-wave Doppler is essential for evaluating shunt hemodynamics in these rare cases.
Area of Science:
- Cardiovascular Imaging
- Interventional Cardiology
Background:
- Coronary artery fistulas are rare congenital or acquired abnormalities.
- Accurate diagnosis and hemodynamic assessment are crucial for management.
Observation:
- Two unusual cases of coronary artery fistula were diagnosed.
- Color Doppler flow imaging identified abnormal flow patterns.
- Continuous-wave Doppler recorded high velocities at fistula drainage sites.
Findings:
- Color Doppler effectively visualized fistula anatomy and flow.
- Hemodynamic data from continuous-wave Doppler confirmed systemic-to-cardiac shunting.
- Selective coronary angiography and surgical findings validated the Doppler diagnoses.
Implications:
- Color Doppler flow imaging is a reliable non-invasive tool for detecting coronary artery fistulas.
- Combined Doppler techniques are vital for comprehensive hemodynamic evaluation of shunt flow.
- These findings support the integration of Doppler imaging in the diagnostic pathway for coronary artery fistulas.
Abstract:
Two unusual cases with coronary artery fistula were reported. The diagnoses were first made by color Doppler flow imaging and confirmed by selective coronary angiography and operation. In the first case, color Doppler revealed a continuous flow signal within the dilated left coronary artery and a turbulent jet within the right atrium. In the second case, color Doppler showed turbulent flow signals which could be traced from the proximal left coronary artery, along the left ventricular posterior wall and into the left ventricle. The high velocities at the site of drainage of fistula were recorded by the continuous-wave Doppler and the calculated pressure gradient confirmed that the abnormal flow was from the systemic circulation. We are of the opinion that color Doppler flow imaging is a reliable technique for detecting coronary artery fistula and the combination of color Doppler with continuous-wave Doppler is essential for evaluating the hemodynamics of the shunt flow.