title: [X-ray videodensitometry and its application to the study of mitral valve closure].
mesh_terms: D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D003287:Contrast Media; D003720:Densitometry; D004285:Dogs; D006327:Heart Block / Q000503:physiopathology; D008943:Mitral Valve / Q000503:physiopathology*; D008944:Mitral Valve Insufficiency / Q000503:physiopathology*; D013690:Television
chemical_list: D003287:Contrast Media
vernacular_title: Rentgenovideodensitometriia i ee primenenie dlia izucheniia usloviĭ zakrytiia mitral'nogo klapana.