Snapshot A 7-month infant presents with his mother for episodes of turning blue. The mother reports that his lips turn blue when he is crying or when he has fevers. The baby was born via a spontaneous vaginal delivery without any complications. His mother did not undergo routine prenatal care while pregnant with him. On physical exam, the infant is underweight. Cardiac exam reveals a harsh systolic ejection murmur. He starts crying in the middle of the exam and becomes cyanotic. The physician puts him in a knee-chest position, and the cyanosis resolves. Introduction Clinical definition login to view 6 more bullets Epidemiology login to view 6 more bullets Etiology login to view 1 more bullet Pathogenesis login to view 5 more bullets Associated conditions login to view 2 more bullets Prognosis login to view 2 more bullets Presentation Symptoms login to view 5 more bullets Physical exam login to view 5 more bullets Imaging Radiography login to view 7 more bullets Echocardiogram login to view 7 more bullets Studies Electrocardiogram login to view 3 more bullets Making the diagnosis login to view 2 more bullets Differential Transposition of the great vessels login to view 3 more bullets Truncus arteriosus login to view 3 more bullets Treatment Medical login to view 9 more bullets Operative login to view 6 more bullets Complications Thrombosis Infective endocarditis Heart failure