dystonia
Pronunciation: dis-TOE-nee-ah
Involuntary muscle contractions causing abnormal postures or twisting movements, often medication-induced in psychiatric patients.
Full Definition
Dystonia refers to involuntary, sustained muscle contractions that result in repetitive twisting movements or abnormal postures. In psychiatric settings, dystonia most commonly occurs as an acute extrapyramidal side effect of antipsychotic medications, typically appearing within hours to days of medication initiation or dose increases. Acute dystonic reactions can affect various muscle groups, including cervical muscles (torticollis), facial muscles (oculogyric crisis, trismus), laryngeal muscles (potentially life-threatening), or truncal muscles (opisthotonus). These reactions are more common in younger patients, males, and with high-potency typical antipsychotics. Treatment involves immediate anticholinergic medications such as benztropine or diphenhydramine, and prevention strategies include prophylactic anticholinergics in high-risk patients.
Usage
Usage note: Distinguish from other movement disorders - dystonia involves sustained contractions, not restlessness (akathisia) or repetitive movements (dyskinesia).
In Context
- "The patient developed acute cervical dystonia 6 hours after haloperidol administration, requiring emergency benztropine injection." — emergency department report
- "Prophylactic benztropine was initiated to prevent dystonia in this young male patient starting high-dose antipsychotic therapy." — medication management plan