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Psychoses 01

Topic: Anatomy

Created on Friday, December 29 2006 by

Last modified on Friday, December 29 2006.

A 33 year-old male beet supplier is brought by ambulance to the emergency room.
He is cooperative and well-groomed. In the course of discussing his history, he calmly mentions that the Illuminati is trying to kill him.
He is accompanied by his second cousin twice removed, who states that he has held this belief for at least 5 months. The second cousin twice removed asks if there isn't anything you can do about this behavior, since it has the rest of the family worried.
The patient feels well otherwise, and continues to do well in his job as a beet supplier.
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) Psychotic disorder due to a general medical condition

B) Schizophreniform disorder

C) Psychotic disorder NOS

D) Delusional disorder

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) 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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B) schizophreniform disorder

This answer is incorrect.

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 psychotic, in that he has delusions, but he remains funcitonal and has no other psychotic symptoms, such as hallucinations, disorganized speech, or grossly disorganized behavior. A greater degree of psychosis is required for a diagnosis of schizophrenia or schizophreniform disorder. (See References)


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C) psychotic disorder NOS

This answer is incorrect.

Psychotic disorder NOS is only made when a patient is psychotic, but does not meet the criteria for another diagnosis. This patient's symptoms meet the criteria for delusional disorder. (See References)


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D) delusional disorder

This answer is correct.

In delusional disorder, the patient is delusional for at least 1 month, but has no other marked impariment of function. This patient is displaying psychotic symptoms of delusions. There are no hallucinations or mood symptoms. His psychosis has no obvious organic cause. He has had delusions for more than 1 month. (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