title: [Changes in the 3d heart sound in normal pregnancy and labor].
mesh_terms: D000328:Adult; D005260:Female; D006326:Heart Auscultation; D006801:Humans; D007743:Labor, Obstetric; D010701:Phonocardiography; D011247:Pregnancy
vernacular_title: Izmeneniia 3 tona serdtsa u zdorovykh beremennykh i rodil'nits.