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An 8-yr-old girl presents with chest pain of 1 day's duration. Five days before onset of the pain, she had fever, chills, and myalgias. Physical examination reveals an uncomfortable, anxious, afebrile patient with tachycardia, no murmur, and distant heart sounds. The chest radiograph shows cardiomegaly without pulmonary edema. There is a paradoxical pulse of 22 mm Hg. The most likely diagnosis is:  

a) Myocarditis  

b) Cardiomyopathy  

c) Kawasaki disease  

d) Pericarditis  

e) Sepsis

in Pediatrics by

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d) Pericarditis