When providing care for a client on antipsychotic medication, which symptom should prompt the nurse to suspect acute dystonia?

Choice A reason: Involuntary tremors and bradykinesia are classic signs of pseudoparkinsonism, another type of extrapyramidal side effect caused by dopamine blockade in the nigrostriatal pathway. While also related to antipsychotic use, these symptoms represent a state of motor slowing and rhythmic shaking rather than the acute, painful muscle spasticity seen in dystonia. Choice B reason: Persistent restlessness and the internal urge to move describe akathisia. This condition manifests as an inability to sit still, pacing, or foot-tapping. It is distinct from dystonia because it involves a subjective sense of distress and voluntary-appearing movements to relieve tension, whereas dystonia involves involuntary, fixed muscle contractions. Choice C reason: Involuntary facial tics and grimacing, specifically if they are rhythmic and late-appearing, are characteristic of tardive dyskinesia. This is a potentially irreversible condition resulting from long-term antipsychotic exposure. Acute dystonia, by contrast, occurs very early in treatment, often within the first 48 hours, and involves rigid muscle clamping. Choice D reason: Acute dystonia is characterized by sudden, sustained, and often painful muscle contractions of the head, neck, or torso. Common presentations include torticollis, where the neck twists to one side, or an oculogyric crisis, where the eyes roll upward. It is a medical emergency requiring immediate treatment with intramuscular anticholinergic agents like benztropine.