Which symptom might indicate pseudoparkinsonism due to antipsychotic treatment?

Choice A reason: Involuntary lip-smacking and facial grimacing are classic signs of tardive dyskinesia, not pseudoparkinsonism. These symptoms result from dopamine receptor supersensitivity in the nigrostriatal pathway after prolonged blockade and are often irreversible, unlike the symptoms associated with drug-induced parkinsonism. Choice B reason: Acute muscle spasms, particularly those that result in abnormal posturing of the head or trunk, indicate acute dystonia. This is a rapid-onset extrapyramidal reaction that requires immediate intervention with anticholinergic medications like benztropine, whereas pseudoparkinsonism involves more generalized rigidity and slow movement patterns. Choice C reason: The subjective and objective need to move, or the inability to remain seated, defines akathisia. While both are extrapyramidal symptoms caused by dopamine blockade, akathisia is a disorder of movement urgency, whereas pseudoparkinsonism mimics the motor deficits of idiopathic Parkinson’s disease. Choice D reason: Pseudoparkinsonism is characterized by a constellation of symptoms including "lead-pipe" muscle stiffness, a shuffling gait with a narrowed base, and a mask-like facial expression. These symptoms are caused by the blockade of dopamine D2 receptors in the basal ganglia by antipsychotic medications.