ajith-jayasekara-schizophrenia-lecture

Schizophrenia and Related Disorders — Dr. Ajith Jayasekara (Lecture)

Source Info

• Type: Lecture Presentation (Two Parts)
• Author(s): Dr. Ajith Jayasekara
• Date: Ingested 2026-05-05
• Filed at: sources/lectures/ajith-jayasekara-schizophrenia-part-1.pdf and part-2.pdf

Key Takeaways

1. Epidemiology: 1% lifetime risk; Point prevalence 1%; Incidence 15-30/100,000/year. Earlier onset in males. Higher in urban/lower social classes (Social drift vs. Social residue).
2. Aetiology: “Double hit” hypothesis (Genetics + Environment). Lifetime risk: 10% (1st degree), 45% (Identical twins).
3. Pathophysiology: Dopamine overactivity (mesolimbic/mesocortical) and Neurodevelopmental hypothesis (neural dysplasia + synaptic pruning).
4. Clinical Phases:
   • Prodromal: Functional decline is the cardinal feature.
   • Acute: Psychosis (delusions, hallucinations, disorganized behavior).
   • Chronic: Negative symptoms (emotional blunting, apathy, reduced speech) - the “defect state”.
5. Schneider’s First Rank Symptoms: Detailed list (echo, commentary, passivity, etc.) - common but not essential for diagnosis.
6. Diagnosis (ICD-10): Requires minimum 1 month duration. Minimum 1 from Group 1-4 or 2 from Group 5-8.
7. Management:
   • Acute: Atypical antipsychotics preferred; Clozapine for resistance; IM Haloperidol for aggression; ECT for catatonia.
   • Maintenance: Treatment for at least 3 years after 1st episode.
8. Prognosis: Rule of thirds (Recover, Relapse/Remit, Chronic). 10% suicide risk.
9. Related Disorders: Schizoaffective, Acute psychotic disorder (<1 month), Persistent delusional disorder.

Wiki Pages Updated

• schizophrenia
• delusional-disorder
• acute-and-transient-psychotic-disorder
• schizoaffective-disorder
• icd-10-schizophrenia-criteria
• clozapine
• psychiatry-high-yield
• _index.md
• _log.md

Notable Details

• ⚠️ EXAM DETAIL: The cardinal feature of the prodromal phase is unexplained functional decline.
• ⚠️ EXAM DETAIL: First episode psychosis treatment must continue for at least 3 years.
• 💡 FIRST PRINCIPLE: “Social drift” explains higher prevalence in lower classes as a result of the illness causing downward social mobility.