A pateint of Schizophrenia treated for 5 years developed perioral movem-ents. Likely diagnosis is:
**Core Concept**
Tardive Dyskinesia (TD) is a side effect of long-term antipsychotic medication use, characterized by involuntary, repetitive movements. It is a form of neuroleptic-induced movement disorder.
**Why the Correct Answer is Right**
The patient's 5-year history of schizophrenia treatment with antipsychotics increases the risk of developing TD. This condition is thought to be related to dopamine receptor supersensitivity in the basal ganglia, particularly in the nigrostriatal pathway. The perioral movements, such as lip smacking, puckering, or tongue protrusion, are classic symptoms of TD. The pathophysiology involves an imbalance in the dopaminergic and cholinergic systems, leading to abnormal motor control.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Acute Dystonia is a different movement disorder that typically occurs within the first few weeks of antipsychotic treatment, not after years of treatment.
**Option B:** This option is incorrect because Parkinsonism is another side effect of antipsychotics, but it is characterized by tremors, rigidity, bradykinesia, and postural instability, not perioral movements.
**Option C:** This option is incorrect because Akathisia is a movement disorder that presents with subjective feelings of restlessness and an urge to move, often accompanied by fidgeting or pacing, but it does not typically cause perioral movements.
**Clinical Pearl / High-Yield Fact**
Tardive Dyskinesia can be irreversible and may persist even after discontinuation of antipsychotic medication. Early recognition and treatment are crucial to prevent its development.
**Correct Answer:** C.