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Difficulty: MediumDepressive Disorders

A 2828-year-old woman, who is at 1010 weeks gestation in her first pregnancy, presents to the psychiatric clinic with a 44-week history of overwhelming sadness, excessive sleeping up to 14 hours14\text{ hours} a day, and a sensation that her arms and legs are "weighed down by lead." She experiences daily crying spells and profound guilt over her lack of excitement regarding the pregnancy. She mentions that her primary care physician prescribed fluoxetine 33 weeks ago, but she discontinued it yesterday because she felt it was completely ineffective. Vital signs are within normal limits. Laboratory studies show a thyroid-stimulating hormone (TSH) level of 0.2 \muU/mL0.2\text{ \mu U/mL} (normal non-pregnant: 0.50.5-5.0 \muU/mL5.0\text{ \mu U/mL}) and a free thyroxine (T4) level of 1.1 ng/dL1.1\text{ ng/dL} (normal: 0.90.9-1.7 ng/dL1.7\text{ ng/dL}). Which of the following is the most appropriate next step in the management of this patient?

  1. Assess for a history of episodes characterized by racing thoughts and excessive energyAnswer
  2. B
    Initiate sertraline therapy to replace the discontinued medication
  3. C
    Prescribe phenelzine to specifically target her atypical depressive symptoms
  4. D
    Reassure her that her emotional lability and fatigue are expected pregnancy adaptations
  5. E
    Consult endocrinology for the treatment of subclinical hyperthyroidism

Answer

Assess for a history of episodes characterized by racing thoughts and excessive energy
This patient is experiencing a major depressive episode with atypical features (hypersomnia, leaden paralysis). A critical standard of care in psychiatry is to screen every patient presenting with depression for a past history of manic or hypomanic episodes before initiating antidepressant therapy. Atypical depressive features are highly correlated with bipolar depression. Prescribing antidepressant monotherapy to a patient with unrecognized bipolar disorder can precipitate a severe manic switch or rapid cycling.

Step-by-Step Solution

1
Analyze the patient's psychiatric presentation.
The patient meets criteria for a major depressive episode with atypical features (hypersomnia, leaden paralysis).
Establishing the current syndromic diagnosis guides the pharmacological approach.
2
Evaluate the patient's medication history.
The patient engaged in premature drug discontinuation of fluoxetine after only 33 weeks, which has a very long half-life.
Recognizing the short trial duration prevents incorrectly labeling the episode as treatment-resistant, and noting the specific drug (fluoxetine) informs future drug interaction risks.
3
Interpret the laboratory findings in the context of her pregnancy.
The mildly suppressed TSH with normal free T4 is a normal physiologic finding at 1010 weeks gestation due to hCG cross-reactivity.
This rules out an underlying endocrine pathology as the cause of her symptoms.
4
Determine the necessary diagnostic prerequisite before prescribing a new treatment.
The physician must screen for a history of mania or hypomania.
Antidepressant monotherapy in an unrecognized bipolar patient can precipitate a severe manic switch.

Key Concept

In patients presenting with a major depressive episode, particularly those with atypical features, screening for a history of manic or hypomanic episodes is a mandatory prerequisite before prescribing antidepressant therapy.
Estimated Time:1m 30s
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Topics

Depressive Disorders

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