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Zorluk: ZorSchizophrenia and Psychotic Disorders

An occupational health physician is reviewing the records of a 29-year-old woman currently hospitalized for psychiatric stabilization. A detailed collateral history is obtained from her husband. The patient first experienced psychiatric symptoms 5 years ago, characterized by a 2-month period of profound sadness, anhedonia, and severe insomnia, accompanied by auditory hallucinations commanding her to harm herself. She received treatment and was completely asymptomatic for the next two years. Three years ago, she developed a persistent belief that her neighbors were surveilling her and began hearing two voices conversing about her behavior. She has experienced these psychotic symptoms continuously for the last 36 months. However, during this 36-month period, her mood, energy, and sleep were entirely normal until 2 weeks ago. Over the past 2 weeks, she abruptly developed severe euphoria, pressured speech, and a decreased need for sleep, while still experiencing the paranoia and auditory hallucinations. Medical workup and urine toxicology are unremarkable. Which of the following is the most accurate diagnosis?

  1. SchizophreniaCevap
  2. B
    Schizoaffective disorder, bipolar type
  3. C
    Bipolar I disorder with psychotic features
  4. D
    Schizophreniform disorder
  5. E
    Delusional disorder

Cevap

Schizophrenia
The correct diagnosis is Schizophrenia. This patient has a lifetime history of psychotic symptoms (hallucinations, delusions) meeting Criterion A for schizophrenia, as well as distinct major mood episodes (depression and mania). A common pitfall is to automatically diagnose schizoaffective disorder when a patient has a history of both mood episodes and periods of pure psychosis lasting >2>2 weeks. However, DSM-5 Criterion C for schizoaffective disorder explicitly requires that symptoms meeting the criteria for a major mood episode be present for the *majority* of the total duration of the active and residual portions of the illness. In this case, the patient has 3838 total months of active psychotic illness, but only 2.52.5 total months of mood episodes. Because the mood symptoms are present for a minority of the illness duration, the diagnosis defaults to schizophrenia (with superimposed mood episodes).

Adım Adım Çözüm

1
Identify the total duration of the active and residual portions of the psychotic illness.
The patient had 22 months of psychosis initially, followed by a continuous 3636-month period, yielding a total active illness duration of 3838 months.
To evaluate diagnostic criteria for schizoaffective disorder, the denominator (total illness duration) must first be established.
2
Identify the total duration of major mood episodes.
The patient had 22 months of major depression and 0.50.5 months (22 weeks) of mania, yielding a total of 2.52.5 months of mood symptoms.
The numerator (duration of mood episodes) is required to determine the proportion of the illness accompanied by mood symptoms.
3
Compare the duration of mood episodes to the total duration of the psychotic illness.
The mood episodes (2.52.5 months) represent a small minority (<10%<10\%) of the total illness duration (3838 months).
DSM-5 Criterion C for schizoaffective disorder requires mood symptoms to be present for the majority (>50%>50\%) of the total illness duration.
4
Determine the correct diagnosis based on the timeline findings.
Because the criterion for the predominance of mood symptoms is not met, the diagnosis defaults to Schizophrenia.
Periods of pure psychosis lasting ≥2\geq 2 weeks rule out bipolar disorder with psychotic features, while the lack of predominant mood symptoms over the illness course rules out schizoaffective disorder.

Anahtar Kavram

To diagnose schizoaffective disorder, mood symptoms must be present for the majority of the total duration of the active and residual portions of the illness; otherwise, the diagnosis remains schizophrenia.
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Konular

Schizophrenia and Psychotic Disorders

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