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Diastolic (presystolic) murmur often heard in the second stage of mitral stenosis

The murmur occurs throughout diastole, with a gradual increase in intensity as it approaches the first heart sound (S1). No second sound is audible at the apex. (Source: Cabot RC. Physical Diagnosis of Diseases of the Chest. Second edition. New York: William Wood and Company, 1903. Public domain.)

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