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In an older child, a sign of aortic stenosis is:

An ill-appearing 9-week-old baby girl is brought to the emergency room. She is pale and dyspneic with a respiratory rate of 80 breaths per minute. Heart rate is 195 beats per minute, heart sounds are distant, a gallop is heard, and she has cardiomegaly on x-ray. An echocardiogram demonstrates poor ventricular function, dilated ventricles, and dilation of the left atrium. An ECG shows ventricular depolarization complexes that have low voltage. Which of the following is the most likely diagnosis based on this clinical picture?

All of the following are patterns of bone destruction indicative of a bone tumor EXCEPT?

Eight-year-old Elena who has cystic fibrosis comes to the ER with a persistent cough and fever. Her physical exam reveals diffuse crackles throughout her lower bases. Her chest x-ray reveals scattered perihilar infiltrates. Which one of the following organisms is most likely the cause of her pneumonia?

An adolescent with type 1 diabetes returns for a follow-up visit after his annual check-up last week. You note that his serum glucose is elevated and his glycosylated hemoglobin (hemoglobin A1C) is 16.7%. This finding suggests poor control of his diabetes over at least which of the following time periods?

Chest pain in children is usually:

What causes numbness and tingling in the fingers of individuals with untreated pernicious anemia?

What recommendation has been made to screen newborns for undetected congenital heart disease prior to discharge home?

A 2-year-old boy is brought into the emergency room with a complaint of fever for 6 days and the development of a limp. On examination, he is found to have an erythematous macular exanthema over his body, conjunctivitis, dry and cracked lips, a red throat, and cervical lymphadenopathy. There is a grade 2/6 vibratory systolic murmur at the lower left sternal border. A white blood cell count and differential show predominant neutrophils with increased platelets on smear. Which of the following is the most likely diagnosis?

A 57-year-old male presents to his primary care provider for red face, hands, feet, ears, and headache and drowsiness. A blood smear reveals an increased number of erythrocytes, supporting the diagnosis of: