Psychosis due to medical conditions

Psychosis due to medical conditions

Psychosis due to medical conditions

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Core Concepts - Not Just Delirium

  • Distinguished from delirium by a clear sensorium and normal level of consciousness. Psychotic symptoms are the core feature, not a consequence of attentional deficits.
  • Requires evidence from history, physical exam, or labs that hallucinations/delusions are a direct physiological result of a specific medical condition.
  • A close temporal association between the medical illness (onset, exacerbation) and psychotic symptoms is essential for diagnosis.
  • Common etiologies:
    • Neurologic: Seizures (post-ictal), CNS tumors, stroke, Huntington's disease
    • Endocrine: Cushing's syndrome, thyroid/parathyroid disorders
    • Autoimmune/Inflammatory: SLE, anti-NMDA receptor encephalitis

⭐ Visual hallucinations are more common than auditory ones, a key feature distinguishing it from primary psychotic disorders like schizophrenia.

Common Culprits - The Body's Rebellion

  • Neurologic Causes

    • CNS Infections (e.g., HSV encephalitis, neurosyphilis)
    • Cerebrovascular Disease (Strokes, vasculitis)
    • Degenerative Disorders (Huntington's, Lewy Body Dementia)
    • Seizure-related (ictal, post-ictal)
    • Space-occupying lesions (neoplasms)
    • Autoimmune (e.g., Anti-NMDA receptor encephalitis, SLE cerebritis)
    • Traumatic Brain Injury (TBI)
  • Endocrine & Metabolic

    • Thyroid dysfunction (thyrotoxicosis, myxedema madness)
    • Adrenal disorders (Cushing's, Addison's)
    • Electrolyte imbalance (↓Na+, ↑Ca2+)
    • Hypoglycemia
    • Organ failure (uremia, hepatic encephalopathy)
  • Systemic & Nutritional

    • Infections (HIV, sepsis)
    • Vitamin deficiencies (B12, B1, B3)

Anti-NMDA Receptor Encephalitis: A critical diagnosis to consider in young patients (especially women) with new-onset psychosis, seizures, dyskinesias, and autonomic instability. Frequently paraneoplastic, associated with ovarian teratomas.

Workup & Management - Sleuthing & Soothing

  • Core Principle: Identify and treat the underlying medical etiology. Psychosis should resolve as the medical condition improves.

  • Initial Workup:

    • History & Physical: Focus on new medications, substance use, and systemic signs of illness.
    • Labs: CBC, CMP, TSH, Vitamin B12/folate, urinalysis, urine drug screen.
    • Targeted Tests: RPR/VDRL (syphilis), HIV screen, ANA (lupus), ceruloplasmin (Wilson's), LP (if CNS infection/inflammation suspected).
    • Imaging/Function: Brain CT/MRI, EEG.
  • Management:
    • Primary: Address the root medical cause (e.g., antibiotics for infection, steroids for autoimmune).
    • Symptomatic: Use low-dose, short-term antipsychotics (e.g., Haloperidol, Risperidone) for agitation/psychosis.
    • Environment: Ensure patient safety and provide a calm, structured setting.

Exam Favorite: Always consider anti-NMDA receptor encephalitis in young women presenting with new-onset psychosis, psychiatric symptoms, and subtle neurological signs (e.g., seizures, dyskinesias).

Brain MRI: FLAIR hyperintensity in limbic encephalitis

High-Yield Points - ⚡ Biggest Takeaways

  • This is a diagnosis of exclusion, requiring a thorough workup to rule out other causes.
  • A clear temporal relationship between the general medical condition and the psychosis is essential for diagnosis.
  • Be suspicious with atypical features like late age of onset, visual hallucinations, or fluctuating consciousness.
  • Key causes include CNS disease (tumors, seizures), endocrinopathies, autoimmune disorders (SLE), and metabolic disturbances.
  • Management priority is to treat the underlying medical condition first and foremost.

Practice Questions: Psychosis due to medical conditions

Test your understanding with these related questions

A 45-year-old man presents to a psychiatrist by his wife with recent behavioral and emotional changes. The patient’s wife says that her husband’s personality has completely changed over the last year. She also says that he often complains of unpleasant odors when actually there is no discernible odor present. The patient mentions that he is depressed at times while on other occasions, he feels like he is ‘the most powerful man in the world.’ The psychiatrist takes a detailed history from this patient and concludes that he is most likely suffering from a psychotic disorder. However, before prescribing an antipsychotic medication, he recommends that the patient undergoes brain imaging to rule out a brain neoplasm. Based on the presence of which of the following clinical signs or symptoms in this patient is the psychiatrist most likely recommending this imaging test?

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Flashcards: Psychosis due to medical conditions

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Cluster A personality disorders lack _____, which is a distinguishing feature from schizophrenia

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Cluster A personality disorders lack _____, which is a distinguishing feature from schizophrenia

psychosis

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