Here are some snippets/links which Elisa sent me:
We report a 6 year old girl who developed acute chorea following cardiac surgery using hypothermia and total cardiopulmonary bypass. Rheumatic disease, cerebral embolism or hemorrhage were excluded. Cerebral hypoperfusion during surgery is the most probable cause for this neurologic event. Treatment with Tiaprid (Tiapridex) resulted in a rapid resolution of symptoms.
Choreoathetosis is a rare complication after surgery on congenital heart malformations with cardiopulmonary bypass and profound hypothermia. We reviewed the hospital course and follow-up of 3 patients, who developed acute chorea during the early postoperative period (within 3-6 days after surgery). CTscan of the brain and/or MRI were completely normal in all patients. Medical treatment with tiapride was administered in patient 1 and 2. In patient 2 symptoms resolved within several weeks; patient 1 and 3 showed residual choreiform movements for 48 and 14 months, respectively.
Discussion: Acute chorea after cardiopulmonary bypass surgery occurs with clinical symptoms varying from mild to severe. This complication has been described in association with profound hypothermia and hypothermic criculatory arrest; however, additional factors are supposed to be responsible for lesions causing choreoathetosis as found by reviewing the present literature.