Incidental diagnosis of right-to-left atrial shunt by computed tomography

Area of Science:

• Cardiology
• Diagnostic Imaging
• Congenital Heart Disease

Background:

• Atrial shunts are typically diagnosed using echocardiography.
• Atrial septal defects (ASDs) are common congenital heart diseases, often asymptomatic in adulthood.
• Right-to-left atrial shunts are an uncommon finding in patients with ASDs.

Observation:

• A right-to-left atrial shunt was incidentally discovered during a routine computed tomography angiography scan.
• Transthoracic echocardiography was performed to verify the presence and direction of the atrial shunt.
• Intravenous agitated saline injected during transthoracic echocardiography demonstrated microbubbles entering the left side of the heart.

Findings:

• The study presents a case where a right-to-left atrial shunt was identified unexpectedly via computed tomography angiography.
• Transthoracic echocardiography confirmed the shunt, visualizing microbubble transit from the right to the left atrium.
• This case highlights an uncommon direction of blood flow in an atrial septal defect.

Implications:

• Incidental findings of atrial shunts on computed tomography angiography may warrant further echocardiographic investigation.
• Understanding uncommon shunt directions is crucial for accurate diagnosis and management of congenital heart disease.
• This case underscores the importance of considering echocardiography for evaluating unexpected findings suggestive of intracardiac shunting.