Letter: Mitral valve reopening.
D000367:Age Factors; D001146:Arrhythmia, Sinus / Q000503:physiopathology; D006326:Heart Auscultation; D006327:Heart Block / Q000503:physiopathology*; D006347:Heart Sounds; D006801:Humans; D008943:Mitral Valve / Q000503:physiopathology*