title: Doppler echocardiographic profiles in obstructive right and left atrial myxomas.
abstract: Previous reports have suggested that atrioventricular (AV) flow disturbances accompanying atrial myxomas mimic mitral stenosis. Two patients complaining of orthostatic syncope and positional intolerance had a large right and left atrial myxoma, respectively. Doppler flow records showed abrupt early diastolic flow cessation and normal velocity half-times, unlike AV valve stenosis. Large, obstructing atrial myxomas may behave as ball valves.
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity; D004452:Echocardiography; D005260:Female; D006325:Heart Atria; D006338:Heart Neoplasms / Q000150:complications / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000503:physiopathology; D009232:Myxoma / Q000150:complications / Q000503:physiopathology* / Q000601:surgery; D012039:Regional Blood Flow; D014262:Tricuspid Valve Insufficiency / Q000150:complications / Q000503:physiopathology