A 4-year-old boy is found to have an asymptomatic cardiac murmur during a routine physical examination. Cardiac auscultation reveals a fixed, widely split S2 with a systolic flow murmur at the left upper sternal border. Chest X-ray shows cardiomegaly with increased pulmonary vascular markings. Which of the following is the most likely diagnosis?
- A)Atrial septal defectGABARITO
- B)Aortic regurgitation
- C)Mitral regurgitation
- D)Pulmonary regurgitation
- E)Ventricular septal defect
Explicação
Atrial septal defect (ASD) is characterized by a fixed, widely split S2 (due to increased right ventricular stroke volume and delayed pulmonary valve closure). The systolic murmur represents increased flow across the pulmonary valve. ASD causes left-to-right s... Ver explicação completa e trilha adaptativa →