May Be Caused by

 Common

Aortopulmonary window

Complete AV communis

High-output heart function

Partial AV communis

Systemic-to-pulmonary vascular shunt

 Uncommon

Aorta-pulmonary artery fistula

Aortic atresia

Common atrium

Cor biloculare

Coronary artery fistula

Double outlet right ventricle without PS

Eisenmenger syndrome

Pulmonary arteriovenous malformation

Rupture of sinus of Valsalva aneurysm

Single ventricle without PS

Taussig-Bing syndrome

Transposition of great vessels with large VSD

Tricuspid atresia without PS

Truncus arteriosus