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The disappearance of a third heart sound in a case of calcific pericarditis after surgery together with a quantitative study of the time and frequency relations of the third heart sound in 70 cases suggests that the tensing of the pericardium is a factor in its production. The frequency characteristics of the third heart sound are such that it may be identified in the presence of a diastolic murmur.

Third Heart Sound: Possible Role of Pericardium in its Production