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Difficulty: HardAnxiety, OCD, and Trauma-Related Disorders

A 29-year-old woman comes to the psychiatry clinic seeking help for severe, distressing thoughts. For the past 6 months, she has experienced recurrent, intrusive images of accidentally leaving the stove on and burning down her house. These thoughts cause intense anxiety. To relieve this anxiety, she feels compelled to check the stove exactly seven times before leaving the house, often making her late for work. She recognizes that these thoughts and behaviors are excessive but feels unable to stop them. A review of her psychiatric history reveals a hospitalization 5 years ago for a 10-day episode of persistently elevated mood, grandiosity, decreased need for sleep, and pressured speech. She is currently prescribed phenelzine for depression, but she states it is not helping her checking behaviors. She is open to both psychological and new pharmacological interventions.

Which of the following statements regarding the diagnosis and management of this patient are correct? (Select all that apply)

  1. Recommend exposure and response prevention therapy as a first-line psychological intervention.Answer
  2. Require a 14-day washout period after discontinuing phenelzine before starting a selective serotonin reuptake inhibitor.Answer
  3. C
    Initiate sertraline immediately alongside phenelzine to achieve a rapid reduction in obsessive-compulsive symptoms.
  4. D
    Initiate selective serotonin reuptake inhibitor monotherapy, as it is the standard pharmacological treatment and avoids the need for a concurrent mood stabilizer.
  5. E
    Diagnose brief psychotic disorder, as the intrusive thoughts represent delusions that have been present for a duration of 6 months.

Answer

The correct statements are recommending exposure and response prevention therapy as a first-line psychological intervention, and requiring a 14-day washout period after discontinuing phenelzine before starting a selective serotonin reuptake inhibitor.
Exposure and response prevention (ERP) is the first-line, evidence-based psychological treatment for OCD. When pharmacological treatment is indicated, SSRIs are the medications of choice. However, because this patient is currently taking phenelzine (an MAOI), she must undergo a strict 14-day washout period after stopping the MAOI before starting any SSRI to avoid life-threatening serotonin syndrome.

Step-by-Step Solution

1
Identify the primary diagnosis based on the patient's current presentation.
The patient has recurrent, intrusive thoughts (obsessions) and repetitive checking behaviors aimed at reducing anxiety (compulsions). Her insight is intact. This confirms Obsessive-Compulsive Disorder (OCD).
Establishing the correct primary diagnosis is necessary to determine the appropriate first-line psychotherapy (ERP).
2
Identify any relevant comorbid psychiatric conditions from the patient's history.
The history of a 10-day episode of elevated mood, grandiosity, and decreased sleep requiring hospitalization indicates a diagnosis of Bipolar I Disorder.
Comorbid bipolar disorder significantly alters the safety profile of standard pharmacological treatments for OCD, specifically the use of antidepressants.
3
Evaluate the patient's current medication regimen and potential pharmacological interactions.
The patient is currently taking phenelzine, which is a monoamine oxidase inhibitor (MAOI).
MAOIs have dangerous interactions with serotonergic agents, dictating strict timeline rules for medication transitions.
4
Synthesize the findings to select appropriate management steps.
ERP is the safest and most effective initial treatment. If transitioning to an SSRI, a 14-day MAOI washout is required, and the risk of a manic switch due to the bipolar history must be mitigated, ruling out SSRI monotherapy.
Management must concurrently address the OCD symptoms while preventing serotonin syndrome and iatrogenic mania.

Key Concept

The management of Obsessive-Compulsive Disorder (OCD) frequently utilizes exposure and response prevention (ERP) and SSRIs, but treatment must be carefully tailored to prevent severe pharmacological interactions (e.g., MAOI to SSRI washout) and mood destabilization in patients with comorbid bipolar disorder.
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Topics

Anxiety, OCD, and Trauma-Related Disorders

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