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Psychoses 01

Topic: Anatomy

Created on Friday, December 29 2006 by

Last modified on Friday, December 29 2006.

A 34 year-old male police officer is brought by ambulance to the emergency room.
He is uncooperative, disheveled, and insists that he is the head of Scotland Yard.
He complains of hearing voices telling him to feed the kangaroo rats.
He is accompanied by his girlfriend, who states that he was lucid and rational until 6 weeks ago. He has been exhibiting these behaviors fairly consistently since that time.
There is no significant past medical or psychiatric history.
Apart from his mental status, physical exam is unremarkable.
Urine and serum toxicology screens are negative. Other lab work and imaging, including head CT and MRI, are normal.

Of the following, which is the most appropriate diagnosis?

A) Delusional disorder

B) Schizophreniform disorder

C) Schizophrenia

D) Psychotic disorder due to a general medical condition

E) Substance-induced psychotic disorder

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This question was created on December 29, 2006 by .
This question was last modified on December 29, 2006.

ANSWERS AND EXPLANATIONS

A) delusional disorder

This answer is incorrect.

In delusional disorder, the patient is delusional for at least 1 month, but has no other marked impariment of function. This patient's psychotic features are not limited to delusions. He is also hallucinating, and by history is functionally impaired. (See References)


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B) schizophreniform disorder

This answer is correct.

The diagnosis of schizophreniform disorder is made when psychotic symptoms last more than 1 month, but less than 6 months. After 6 months, a diagnosis of schizophrenia can be made. Prior to 1 month, a diagnosis of brief psychotic disorder should be considered. This patient is displaying psychotic symptoms of delusions and hallucinations. His psychosis has no obvious organic cause. He has been psychotic for more than 1 month. The total duration of symptoms has been less than 6 months. (See References)


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C) schizophrenia

This answer is incorrect.

The diagnosis of schizophrenia requires at least 6 months of continuous signs of psychological disturbance. This 6-month period must include at least 1 month of "active-phase" symptoms: delusions, halucinations, disorganized speech, grossly disorganized or catatonic behavior, or negative symptoms (affective flattening, alogia, or avolition). This patient's symptoms have lasted less than a total of 6 months. (See References)


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D) psychotic disorder due to a general medical condition

This answer is incorrect.

The diagnosis of psychotic disorder due to a general medical condition is made when findings of delusions, hallucinations, disorganized speech, or grossly disorganized behavior are attributable to the direct physiological effects of a general medical condition. His psychosis has no obvious organic cause. (See References)


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E) substance-induced psychotic disorder

This answer is incorrect.

The diagnosis of substance-induced psychotic disorder is made when findings of delusions, hallucinations, disorganized speech, or grossly disorganized behavior are attributable to the direct physiological effects of a medication, drug of abuse, toxin, or other substance. His psychosis has no obvious organic cause. (See References)


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References:

1. American Psychiatric Association (2000). Diagnostic and Statistical Manual of Mental Disorders Fourth Edition, Text Revision. American Pyschiatric Association, Washington, DC. (ISBN:0890420254)

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anatomy
Psychoses 01
Question ID: 12290600
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 12/29/2006
Modified: 12/29/2006
Estimated Permutations: 0