Tetrabenazine-Responsive Choreo-Ballism and Akathisia After Cardioversion and Coronary Angiography: A Case Report.

Hyperkinetic movement disorders after routine cardiac procedures are rare yet disabling and often misdiagnosed. We report the case of a 76-year-old man who developed abrupt, generalized choreo-ballism with severe akathisia one day after coronary angiography. Metabolic and inflammatory serum studies were unremarkable, brain magnetic resonance imaging (MRI) demonstrated no acute causative lesion, including no basal ganglia abnormality, and cerebrospinal fluid (CSF) analysis was non-inflammatory with negative infectious, autoimmune, and paraneoplastic testing. Low-dose tetrabenazine produced rapid (>80%) and sustained remission, permitting drug discontinuation after 16 months without relapse. When choreo-ballism emerges after cardiac interventions, transient basal ganglia dysfunction related to peri-procedural hypoxia or contrast neurotoxicity may be considered as a possible mechanism, and early vesicular monoamine transporter type 2 (VMAT-2) inhibition may facilitate recovery.