title: Letter: A disagreement over an echocardiogram.
mesh_terms: D002305:Cardiac Tamponade / Q000175:diagnosis* / Q000503:physiopathology; D004452:Echocardiography / Q000379:methods; D006352:Heart Ventricles; D006801:Humans; D008943:Mitral Valve / Q000503:physiopathology