title: [Sound spectrographic studies in mitral valve defects].
mesh_terms: D004452:Echocardiography / Q000379:methods; D006326:Heart Auscultation / Q000379:methods; D006801:Humans; D008944:Mitral Valve Insufficiency / Q000175:diagnosis*; D008946:Mitral Valve Stenosis / Q000175:diagnosis*; D013057:Spectrum Analysis / Q000379:methods; D014463:Ultrasonography
vernacular_title: Schallspektrographische Untersuchungen bei Mitralklappenvitien