A mechanical prosthetic heart valve can become acutely obstructed despite a
nticoagulation therapy. This can be a life-threatening complication. We rep
ort the case of a 38-year-old woman who survived obstruction of her Sorin p
rosthetic mitral valve. She was admitted to the hospital because of severe
pulmonary edema. On auscultation, mechanical valve sounds were absent. Tran
sthoracic echocardiography showed an immobile mechanical valve. The patient
suffered a cardiac arrest while being prepared for surgery, but she underw
ent successful mitral valve replacement after cardiopulmonary resuscitation
. When patients with prosthetic mitral valves present with acute dyspnea, t
he possibility of an obstructed prosthetic valve must be considered in the
differential diagnosis.