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Routine examination of a 16-year-old boy revealed the presence of three heart sounds on auscultation. The third sound is low and occurs in early diastole, there is no additional murmur. In history: pneumonia six months ago. The patient presents no problems. Examination revealed hyposthenia, underdevelopment of muscles. Laboratory and instrumental studies reveald no peculiarities. What is the origin of the additional heart sound?

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