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Difficulty: MediumDepressive Disorders

A 65-year-old man comes to the clinic accompanied by his husband. He has a history of early-stage colon cancer that was surgically resected 6 months6 \text{ months} ago. For the past two months, the patient has experienced pervasive sadness, a 6 kg6 \text{ kg} (13.2 lb13.2 \text{ lb}) weight loss, severe insomnia, and a complete lack of energy. He has also developed the conviction that his cancer is a direct punishment for his past mistakes. He states, "I just need an antidepressant to get my life back." His only current medication is lisinopril for hypertension. Laboratory studies reveal a low free thyroxine (T4) level and a normal thyroid-stimulating hormone (TSH) level of 1.2 mIU/L1.2 \text{ mIU/L}. Which of the following is the most appropriate next step in the evaluation and management of this patient?

  1. Screen the patient for a lifetime history of abnormally elevated mood and decreased need for sleepAnswer
  2. B
    Initiate citalopram monotherapy and schedule a follow-up appointment in four weeks
  3. C
    Prescribe sertraline and advise the patient to discontinue the medication immediately upon symptom resolution
  4. D
    Diagnose brief psychotic disorder and refer for inpatient psychiatric admission
  5. E
    Diagnose primary hypothyroidism based on the low free thyroxine level and initiate levothyroxine

Answer

Screen the patient for a lifetime history of abnormally elevated mood and decreased need for sleep
The correct answer is to screen the patient for a lifetime history of abnormally elevated mood and decreased need for sleep. This patient presents with a major depressive episode (MDE) characterized by severe melancholic and mood-congruent psychotic features (delusions of punishment). Before initiating any antidepressant therapy for an MDE, it is mandatory to screen for a history of manic or hypomanic episodes. Identifying a past manic episode changes the diagnosis from Major Depressive Disorder (unipolar depression) to Bipolar I Disorder. Prescribing antidepressant monotherapy to a patient with bipolar disorder carries a significant risk of inducing a manic switch. Therefore, careful history-taking regarding periods of elevated energy, impulsivity, and decreased need for sleep is the most critical next step.

Step-by-Step Solution

1
Analyze the patient's clinical presentation.
The patient meets the criteria for a major depressive episode (depressed mood, weight loss, insomnia, anergia, excessive guilt) that has lasted for 2 months.
Establishing the current syndromic diagnosis is the first step in psychiatric evaluation.
2
Evaluate the medical workup provided in the stem.
The patient has laboratory findings consistent with euthyroid sick syndrome or secondary hypothyroidism (low T4, normal TSH), but primary hypothyroidism is explicitly ruled out.
Medical causes of depression must be considered, but his severe vegetative and mood-congruent psychotic symptoms point to a primary psychiatric etiology requiring specific psychiatric management.
3
Determine the necessary prerequisite before treating a major depressive episode.
A history of mania or hypomania must be ruled out through direct screening.
Antidepressant monotherapy can precipitate a manic switch in patients with underlying bipolar disorder. Therefore, screening for elevated mood and decreased sleep is mandatory before prescribing any antidepressant.

Key Concept

All patients presenting with a major depressive episode must be carefully screened for a lifetime history of manic or hypomanic episodes to rule out bipolar disorder prior to initiating antidepressant monotherapy.
Estimated Time:1m 30s
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Topics

Depressive Disorders

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