â– LECTURE OVERVIEW: Schizophrenia is a chronic, heterogeneous psychiatric disorder characterized by a disintegration of thought processes and emotional responsiveness.
â– DOPAMINERGIC PATHWAYS & RECEPTORS:
1. Positive Symptoms (Excess/distortion of normal function):
- Manifestations: Hallucinations, delusions, disorganized speech, and grossly disorganized behavior.
- Pathway: Driven by dopamine hyperactivity at D2 receptors selectively in the Mesolimbic pathway of the brain.
2. Negative Symptoms (Loss of normal function):
- Manifestations: Apathy, flat affect, alogia (poverty of speech), anhedonia, and social withdrawal.
- Pathway: Driven by relative dopamine hypoactivity at D1 receptors in the Mesocortical pathways.
â– SURGICAL LANDMARKS & ANATOMICAL BOUNDARIES:
Intraoperative access requires meticulous dissection along defined tissue planes. Avoid excessive traction near neurovascular bundles and look for key bony landmarks or fascial reflections to secure margins.
â– CLINICAL CASE SUMMARY:
A 45-year-old patient presented with acute clinical deterioration. Aggressive initial stabilization, molecular monitoring, and specialized pathology screening confirmed the classic disease hallmarks.
[HY-BOARD-1033]
🌟 Dynamic Clinical Key:
First-generation antipsychotics (e.g., Haloperidol, Chlorpromazine) are potent D2 blockers that treat positive symptoms but can worsen negative symptoms and cause extrapyramidal side effects. Second-generation atypical antipsychotics (e.g., Aripiprazole, Clozapine, Olanzapine) block 5-HT2A receptors alongside D2, offering better management of negative symptoms. Never divide or ligate any vessel before clearly isolating and confirming its origin and termination. Clinical vigilance during early presentation prevents progression along the severe outcome pathway.