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Question

Difficulty: HardAnxiety, OCD, and Trauma-Related Disorders

During a scheduled appointment at the university health center, the parents of a 20-year-old undergraduate student express deep concern regarding their son's recent behavior. Over the previous 16 weeks, the student has dedicated up to 5 hours every evening to vigorously washing his hands and disinfecting his living space. When questioned about the necessity of this routine, the patient becomes visibly agitated and insists, 'My room is covered in microscopic parasites. If I don't eliminate them completely, they will infest my family and cause a fatal disease.' The evaluating physician probes further, asking if there is any chance this fear might be disproportionate. The patient responds, 'Absolutely not. It is an undeniable reality; I can feel them crawling on my epidermis.' He denies experiencing any auditory or visual hallucinations, and his thought process remains linear and goal-directed. Despite the extensive time consumed by these rituals, he has sustained excellent academic performance. Physical examination is notable only for severe erythema and desquamation on both hands. Urine toxicology is negative.

Which of the following is the most appropriate initial pharmacological therapy for this patient's condition?

  1. FluoxetineAnswer
  2. B
    Risperidone
  3. C
    Sertraline combined with phenelzine
  4. D
    Lorazepam
  5. E
    Buspirone

Answer

Fluoxetine
The correct answer is Fluoxetine because the patient's clinical picture is classic for obsessive-compulsive disorder (OCD) featuring the 'absent insight/delusional beliefs' specifier. This specifier is used when a patient is completely convinced that their obsessive beliefs are true. Despite the psychotic-like intensity of the belief, the presence of prominent compulsions (washing for 5 hours) and the absence of other psychotic symptoms (e.g., disorganized speech, auditory hallucinations) confirm OCD. The first-line pharmacological treatment for OCD, regardless of the level of insight, remains a Selective Serotonin Reuptake Inhibitor (SSRI) such as fluoxetine.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and their impact.
The patient exhibits severe, time-consuming repetitive behaviors (washing for 5 hours daily) driven by an intrusive, distressing thought regarding parasitic contamination.
To identify the core psychiatric symptom cluster, which in this case is obsessions and compulsions.
2
Evaluate the nature of the patient's fixed belief and functional status.
The patient possesses 100% conviction that the parasites are real, representing 'absent insight'. However, the delusion is restricted entirely to the OCD theme, and his academic functioning is preserved without other psychotic symptoms.
To differentiate a primary psychotic disorder (e.g., schizophrenia or delusional disorder) from OCD with the 'absent insight/delusional beliefs' specifier.
3
Determine the most appropriate initial pharmacological treatment for the established diagnosis.
First-line pharmacotherapy for Obsessive-Compulsive Disorder is an SSRI, such as fluoxetine, typically required at higher doses than used for depression.
To select the standard of care based on current psychiatric guidelines, avoiding the trap of prescribing antipsychotics for the delusional specifier.

Key Concept

Obsessive-compulsive disorder can present with absent insight (delusional beliefs). Unlike primary psychotic disorders, OCD with absent insight is treated primarily with high-dose SSRIs and exposure and response prevention therapy, rather than antipsychotic monotherapy.
Estimated Time:1m 15s
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Topics

Anxiety, OCD, and Trauma-Related Disorders

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