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291. Regarding MI, the levels of which one of the listed begin to increase 4 to 6 h after the onset of chest pain, reach maximal serum concentration in about 12 to 24 h, and remain elevated for about 3 to 10 days?
292. If a patient has a crescendo-decrescendo midsystolic ejection murmur with a paradoxically split second heart sound (S2) and the left ventricular pressure during systole is markedly greater than the aortic pressure, what is the correct diagnosis?
294. If a 27-year-old female with a history of rheumatic fever during childhood presents with an early diastolic opening snap with a rumbling late diastolic murmur, what will be the possible diagnosis?
295. Acute rheumatic fever classically develops in children 1 to 4 weeks after a group A hemolytic streptococcal (Streptococcus pyogenes) infection of which of the following organs?