title: Echocardiographic findings at onset of paroxysmal supraventricular tachycardia.
mesh_terms: D004452:Echocardiography; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000503:physiopathology; D013614:Tachycardia, Paroxysmal / Q000175:diagnosis*