An echocardiogram usually will show the defect and can measure the pressure in the right ventricle and the lungs. Heart catheterization, a procedure in which a narrow flexible tube called a catheter is threaded through the blood vessels into the heart, may be used to determine the size of the hole and to measure pressure within the heart.
UCSF Health medical specialists have reviewed this information. It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.