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Difficulty: HardAnxiety, OCD, and Trauma-Related Disorders

A 32-year-old woman is evaluated in the psychiatric clinic for severe, persistent anxiety and intrusive thoughts. Over the past 6 months, she has been consumed by an overwhelming fear that her hands are contaminated with deadly environmental bacteria. This has led her to wash her hands up to 50 times a day, with her daily washing routines occupying nearly 4 hours. She has a past psychiatric history of bipolar I disorder, which has been stable on valproate for the last 3 years. Recently, she was diagnosed with a complex skin and soft tissue infection and was started on a 14-day course of oral linezolid 3 days ago. She is deeply distressed by her psychiatric symptoms and is requesting immediate treatment. Vital signs are within normal limits, and physical examination is unremarkable except for dry, cracked skin on her hands. Which of the following is the most appropriate next step in the management of this patient's psychiatric symptoms?

  1. Initiate exposure and response prevention therapyAnswer
  2. B
    Initiate fluoxetine
  3. C
    Discontinue valproate and initiate clomipramine
  4. D
    Delay intervention for 6 months to rule out a psychotic disorder
  5. E
    Contact her employer to recommend a mandatory medical leave

Answer

Initiate exposure and response prevention therapy
The correct approach is to initiate exposure and response prevention (ERP) therapy. The patient's clinical presentation of intrusive thoughts and time-consuming, repetitive behaviors confirms the diagnosis of Obsessive-Compulsive Disorder (OCD). First-line treatments for OCD include serotonergic medications (such as SSRIs or clomipramine) and ERP, a specialized form of cognitive-behavioral therapy. However, this patient is currently taking linezolid for a skin infection. Linezolid possesses reversible monoamine oxidase inhibitor (MAOI) activity. Co-administering an MAOI with an SSRI or a serotonergic TCA risks precipitating life-threatening serotonin syndrome. Furthermore, the patient has a history of Bipolar I Disorder; utilizing antidepressant monotherapy risks inducing a manic episode. ERP is a highly efficacious, non-pharmacological first-line treatment that safely avoids both medication interactions and mood destabilization.

Step-by-Step Solution

1
Identify the primary psychiatric diagnosis based on the clinical presentation.
The patient has ego-dystonic obsessions (fear of contamination) and compulsions (excessive hand washing) lasting >1 hour/day, confirming Obsessive-Compulsive Disorder (OCD).
Accurate diagnosis is required to select evidence-based treatment pathways.
2
Evaluate for pharmacological contraindications based on current medications.
The patient is taking linezolid, which is a reversible, non-selective MAOI. This strictly contraindicates the use of serotonergic drugs (SSRIs, SNRIs, TCAs) due to the risk of serotonin syndrome.
First-line pharmacotherapy for OCD typically involves SSRIs, which must be ruled out in this scenario.
3
Evaluate the patient's psychiatric history for treatment limitations.
The patient has Bipolar I Disorder. Antidepressant monotherapy carries a high risk of inducing a manic switch.
Treatment must not destabilize her underlying, well-controlled bipolar disorder.
4
Select the safest and most effective first-line intervention.
Exposure and response prevention (ERP) therapy is selected.
ERP is a highly effective, first-line treatment for OCD that avoids both the risk of serotonin syndrome and manic switch.

Key Concept

Management of Obsessive-Compulsive Disorder in the setting of complex pharmacological and psychiatric comorbidities.
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Topics

Anxiety, OCD, and Trauma-Related Disorders

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