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Difficulty: MediumAnxiety, OCD, and Trauma-Related Disorders

A 32-year-old male accountant presents to the psychiatric clinic for evaluation of worsening anxiety. For the past 6 months, he has been overwhelmingly preoccupied with the intrusive thought that he might accidentally send confidential client financial data to the wrong email address. To prevent this, he spends 2 to 3 hours every evening repeatedly checking his outbox and reading every sent email multiple times. He recognizes these thoughts are irrational and excessive, but he states he cannot stop the checking behavior. His performance at work has declined significantly, and his manager has recently issued a formal warning. He was diagnosed with atypical depression by another provider and started on phenelzine 2 weeks ago; however, he abruptly stopped taking it 5 days ago due to severe orthostatic hypotension. He asks the physician to provide a medical note explaining his diagnosis to his employer to prevent termination.

Which of the following are the most appropriate next steps in the management of this patient? (Select 2)

  1. Refer the patient for exposure and response prevention therapyAnswer
  2. Postpone the initiation of a selective serotonin reuptake inhibitor for at least 9 more daysAnswer
  3. C
    Initiate fluvoxamine immediately to aggressively target his compulsive behaviors
  4. D
    Call the patient's manager directly to explain the diagnosis and advocate for leniency
  5. E
    Diagnose brief psychotic disorder and begin treatment with a second-generation antipsychotic

Answer

The most appropriate next steps are to refer the patient for exposure and response prevention therapy and to postpone the initiation of a selective serotonin reuptake inhibitor for at least 9 more days.
The patient's clinical presentation of intrusive, distressing thoughts combined with time-consuming repetitive behaviors is highly characteristic of obsessive-compulsive disorder (OCD). First-line treatments for OCD include high-dose selective serotonin reuptake inhibitors (SSRIs) and a specific form of cognitive-behavioral therapy known as exposure and response prevention (ERP). Therefore, referring the patient for ERP is an indicated next step. However, pharmacotherapy must be managed carefully due to his recent medication history. The patient discontinued phenelzine, an irreversible monoamine oxidase inhibitor (MAOI), just 5 days ago. Irreversible MAOIs permanently deactivate the MAO enzyme, and it takes approximately two weeks for the body to synthesize new enzymes. Consequently, a mandatory 14-day washout period is required after discontinuing an MAOI before any serotonergic medication (like an SSRI) can be safely initiated. Administering an SSRI sooner can precipitate serotonin syndrome, a potentially fatal condition characterized by autonomic instability, altered mental status, and neuromuscular hyperactivity. Since 5 days have already passed, the physician must wait a minimum of 9 more days before prescribing an SSRI.

Step-by-Step Solution

1
Identify the primary psychiatric diagnosis based on the clinical presentation.
The patient has obsessive-compulsive disorder (OCD), characterized by egodystonic obsessions (fears of sending wrong emails) and time-consuming compulsions (checking the outbox for hours) that cause significant impairment.
Establishing the correct diagnosis dictates the evidence-based first-line treatment options.
2
Determine the appropriate non-pharmacological treatment for the diagnosis.
Exposure and response prevention (ERP) therapy is the psychotherapy of choice for OCD.
ERP is a specialized type of cognitive behavioral therapy with the strongest evidence for efficacy in OCD.
3
Evaluate the patient's medication history to determine pharmacological options.
The patient took phenelzine, an irreversible monoamine oxidase inhibitor (MAOI), and discontinued it 5 days ago.
MAOIs interact dangerously with many psychiatric medications, necessitating careful transition planning.
4
Calculate the required washout period before starting first-line pharmacotherapy for OCD (SSRIs).
Irreversible MAOIs require a strict 14-day washout period before starting serotonergic agents. Since 5 days have elapsed, the physician must wait at least 9 more days.
Concomitant use or inadequate washout of an MAOI and an SSRI can precipitate life-threatening serotonin syndrome.

Key Concept

First-line treatments for OCD include ERP and SSRIs, but initiating an SSRI requires a strict 14-day washout period after discontinuing an irreversible MAOI to prevent serotonin syndrome.
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Topics

Anxiety, OCD, and Trauma-Related Disorders

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