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Difficulty: MediumBipolar and Related Disorders

A 48-year-old male postal worker is brought to the outpatient clinic by his sister due to a one-month history of profound sadness, severe lack of energy, and sleeping up to 14 hours a day. The patient states he feels constantly sluggish, has gained 5 kg (11 lbs) over the last month, and struggles to maintain concentration while sorting mail at work. He has no significant past medical history and takes no medications. Vital signs are within normal limits. Physical examination reveals no abnormalities. On mental status examination, the patient exhibits notable psychomotor retardation, a depressed mood, and a restricted affect. He denies suicidal ideation as well as auditory or visual hallucinations. When specifically asked about his past psychiatric history, his sister notes that three years ago, he experienced a three-week period where he was unusually talkative, slept only 2 to 3 hours a night without feeling tired, and relentlessly painted both his entire house and the neighbor's fence, claiming to possess "limitless energy." This previous episode resolved without medical intervention. Which of the following is the most appropriate next step in pharmacotherapy?

  1. Prescribe lithium carbonateAnswer
  2. B
    Prescribe citalopram
  3. C
    Prescribe duloxetine
  4. D
    Prescribe amitriptyline
  5. E
    Prescribe mirtazapine

Answer

Prescribe lithium carbonate.
The patient is currently experiencing a major depressive episode but has a clear history of a manic episode (characterized by decreased need for sleep, increased goal-directed activity, and expansive mood), firmly establishing a diagnosis of bipolar I disorder. In patients with bipolar depression, standard treatment must avoid unopposed antidepressants. First-line agents include mood stabilizers (such as lithium or valproate) or specific second-generation antipsychotics. Lithium carbonate is a highly effective, classical first-line agent for both acute bipolar depression and long-term maintenance therapy.

Step-by-Step Solution

1
Analyze the current clinical presentation.
The patient meets the criteria for a major depressive episode.
The patient exhibits depressed mood, hypersomnia, weight gain, fatigue, and poor concentration lasting for at least two weeks (one month in this case).
2
Evaluate the past psychiatric history provided by the collateral source (sister).
The patient has a history of a manic episode.
Three years ago, the patient had a distinct three-week period characterized by a decreased need for sleep, increased goal-directed activity, pressured speech, and grandiosity, which confirms a diagnosis of bipolar I disorder.
3
Select the appropriate pharmacotherapy for a patient with bipolar I disorder currently in a depressive episode.
A mood stabilizer such as lithium carbonate is the correct treatment.
Using antidepressant monotherapy in patients with bipolar disorder can precipitate a manic switch. First-line treatments for acute bipolar depression include lithium, specific second-generation antipsychotics, or lamotrigine.

Key Concept

Management of acute depression in Bipolar I Disorder and avoidance of antidepressant monotherapy.
Estimated Time:1m 30s
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Topics

Bipolar and Related Disorders

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