Diagnosis and Management of Critical Congenital Heart Disease

Introduction to CCHD Diagnosis

The American Academy of Pediatrics recommends that a difference in pre-ductal and post-ductal oxygen saturation levels may indicate right-to-left shunting through a patent ductus arteriosus, suggesting duct-dependent pulmonary flow lesions such as pulmonary atresia, critical pulmonary stenosis, or severe tetralogy of Fallot 1, 2
Higher pre-ductal saturation (right arm) compared to post-ductal saturation (lower extremities) indicates deoxygenated blood flow from the pulmonary artery through the ductus arteriosus to the descending aorta, characteristic of lesions with right ventricular outflow obstruction or pulmonary atresia 1, 2

The American Heart Association suggests that initiating prostaglandin E1 (PGE1) infusion is a high priority to maintain ductal patency in neonates with suspected CCHD, even before echocardiographic confirmation 3
Target oxygen saturation levels between 75-85% to avoid excessive pulmonary blood flow and ensure adequate systemic perfusion 3

Echocardiography is the gold standard for definitive diagnosis of CCHD and should be performed immediately after clinical suspicion or failed CCHD screening 1, 2
It is essential for evaluating cardiac anatomy, ventricular function, ductal patency, and shunting direction 1, 2

Administering normal saline (10 ml/kg) may be necessary for patients showing signs of hypovolemia, as stated by medical insights 4