A 6-month-old is evaluated for failure to thrive and respiratory distress. A chest radiograph reveals cardiomegaly and fluffy perihilar markings suggestive of pulmonary venous congestion. Which serum biomarker, released in response to increased ventricular wall tension, would be most specific for confirming a diagnosis of heart failure?
A 1-month-old infant of a diabetic mother is noted to have a heart murmur. An ECG shows massive QRS voltages and a short P-R interval. An echocardiogram reveals severe, concentric left ventricular hypertrophy. This clinical and electrocardiographic presentation is most characteristic of which condition?
A neonate is diagnosed with Ebstein anomaly of the tricuspid valve and severe cyanosis. Echocardiography shows severe tricuspid regurgitation and a markedly dilated right atrium. The pulmonary valve appears to be immobile, with no forward flow into the pulmonary artery. This phenomenon is best described as?
A 12-year-old with dilated cardiomyopathy and a left ventricular ejection fraction of 35% has persistent New York Heart Association class III symptoms despite treatment with furosemide, enalapril, and carvedilol. A new medication is started that combines an angiotensin receptor blocker with a neprilysin inhibitor. What is the primary beneficial mechanism of the neprilysin inhibitor component in this setting?
A 12-year-old boy with known aortic stenosis undergoes a routine electrocardiogram. The cardiologist measures the S wave in lead V1 as 20 mm and the R wave in lead V6 as 25 mm, for a total of 45 mm. What is this finding indicative of?
An adolescent who received a heart transplant is being counseled on long-term risks associated with his immunosuppressive medications. He is advised to use appropriate precautions when exposed to sunlight. This advice is given to mitigate the increased risk of which specific complication?
An 8-year-old child with obesity is found to have a blood pressure consistently measuring at the 97th percentile for age, sex, and height on three separate office visits. The physical exam is otherwise normal. Before initiating pharmacologic therapy, what is the strongly recommended next step to confirm the diagnosis of sustained hypertension?
A neonate is diagnosed prenatally with pulmonary atresia with an intact ventricular septum. Postnatal cardiac catheterization is performed to guide surgical planning. Which specific finding would most strongly contraindicate an initial attempt at pulmonary valvotomy and favor a single-ventricle palliation pathway?
A 15-year-old female is evaluated for an intermittent apical murmur. On examination, a late systolic murmur preceded by a click is audible. To accentuate these findings and confirm the diagnosis of mitral valve prolapse, which maneuver should be performed?
A 15-year-old is diagnosed with Stage 1 primary hypertension and is overweight. As part of the initial non-pharmacologic management, you counsel the family on therapeutic lifestyle changes. Which named dietary plan is specifically recommended to help lower blood pressure?