[Various forms of presystolic murmur].
D004562:Electrocardiography; D006326:Heart Auscultation; D006339:Heart Rate; D006801:Humans; D008944:Mitral Valve Insufficiency; D008946:Mitral Valve Stenosis; D010701:Phonocardiography
Razlichnye formy presistolicheskogo shuma.