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Zorluk: ZorSchizophrenia and Psychotic Disorders

A 28-year-old woman is accompanied to an initial psychiatric evaluation by her sister. The patient has been experiencing persistent auditory hallucinations of two voices conversing about her behavior, along with the fixed belief that neighbors are using radar to monitor her thoughts. According to the sister, these symptoms began insidiously 9 months ago and have been continuously present since. The sister also notes that 4 months ago, the patient developed a markedly depressed mood, significant fatigue, poor appetite, and passive suicidal ideation. This distinct period of low mood lasted for precisely 4 weeks before completely resolving. However, the patient's hallucinations and paranoid beliefs remained completely unchanged before, during, and after this 4-week period of depression. She currently exhibits a blunted affect but denies any sadness or anhedonia. The patient takes no medications, and her physical examination and basic laboratory studies are unremarkable. Urine toxicology is negative. Which of the following is the most likely diagnosis?

  1. A
    Brief psychotic disorder
  2. B
    Major depressive disorder with psychotic features
  3. C
    Schizoaffective disorder, depressive type
  4. SchizophreniaCevap
  5. E
    Schizophreniform disorder

Cevap

Schizophrenia
The correct answer is Schizophrenia. The patient demonstrates core psychotic symptoms (delusions, auditory hallucinations) and negative symptoms (blunted affect) that have persisted for a total duration of >6 months (9 months in this vignette), satisfying the diagnostic timeline for schizophrenia. While she experienced a concurrent major depressive episode, it is crucial to apply the proportional timeline criteria: in schizophrenia, mood episodes may occur as long as they are present for only a minority of the total duration of the active and residual periods of the illness. Her mood symptoms lasted 4 weeks out of a 36-week (9-month) illness. Because the mood symptoms were not present for the majority of the illness, the diagnosis is schizophrenia, not schizoaffective disorder.

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1
Analyze the core psychotic symptoms and their total duration.
The patient exhibits delusions, auditory hallucinations, and negative symptoms (blunted affect) that have been continuously present for 9 months.
Establishing the core symptom cluster and total timeline is the first step in differentiating primary psychotic disorders.
2
Identify the presence, duration, and relationship of any mood episodes to the psychotic symptoms.
A discrete 4-week major depressive episode occurred during the 9-month illness. Psychotic symptoms were present both during and outside of this mood episode.
The relationship between mood and psychotic symptoms differentiates schizophrenia, schizoaffective disorder, and mood disorders with psychotic features.
3
Apply the proportional duration criteria for mood episodes within a psychotic illness.
The 4-week mood episode represents a very small minority (approximately 11%) of the total 9-month duration of the psychotic illness.
DSM-5 requires mood symptoms to be present for the 'majority' of the total illness duration for a diagnosis of schizoaffective disorder. Because it is a minority, the diagnosis defaults to schizophrenia.

Anahtar Kavram

Differentiating schizophrenia from schizoaffective disorder requires calculating the proportion of time the patient has experienced mood symptoms relative to the total duration of the psychotic illness.
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Konular

Schizophrenia and Psychotic Disorders

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