A 31-year-old woman comes to the clinic with her husband due to a 4-week history of profou… — USMLE Step 2 CK

A 31-year-old woman comes to the clinic with her husband due to a 4-week history of profound sadness, frequent crying spells, and a feeling of being "completely overwhelmed." She delivered her first child 2 months ago via an uncomplicated vaginal delivery. She states that she sleeps heavily when the infant sleeps but still feels exhausted throughout the day. She has a poor appetite and expresses immense guilt over being a "terrible mother." She denies any thoughts of harming herself or the infant. Her medical history is unremarkable. Vital signs are normal. Laboratory testing shows a thyroid-stimulating hormone (TSH) level of $4.2 \mu U/mL$ (normal: $0.5-5.0 \mu U/mL$ ) and a free T4 of $1.1 ng/dL$ (normal: $0.8-2.8 ng/dL$ ). During the interview, her husband mentions that during her second trimester of pregnancy, she experienced a 3-week period where she "barely slept for days," rapidly renovated their entire house single-handedly, and spoke so quickly that he struggled to follow her train of thought. He had assumed this was a severe case of "pregnancy nesting." Which of the following is the most appropriate next step in pharmacological management?

Initiate quetiapineAnswer
B
Initiate sertraline
C
Initiate venlafaxine
D
Initiate levothyroxine
E
Initiate haloperidol

Answer

Initiate quetiapine

This patient is currently experiencing a major depressive episode. However, the collateral history from her husband regarding a 3-week period during her pregnancy characterized by a decreased need for sleep, increased goal-directed activity (renovating the house), and pressured speech is diagnostic of a past manic episode. Therefore, her correct diagnosis is Bipolar I Disorder, current episode depressed. First-line pharmacological treatments for bipolar depression include quetiapine, lurasidone, and cariprazine. Quetiapine is highly effective for bipolar depression and is also one of the preferred agents during the postpartum and lactation period due to its minimal excretion into breast milk.

Step-by-Step Solution

Identify the current psychiatric presentation.

The patient is currently experiencing a major depressive episode with postpartum onset, characterized by sadness, crying spells, guilt, and fatigue.

Establishing the current mood state is the first step in psychiatric evaluation.

Evaluate the patient's psychiatric history provided by the husband.

The history of a 3-week period of decreased need for sleep, increased goal-directed activity, and pressured speech meets the criteria for a manic episode.

Collateral history is essential to differentiate unipolar major depressive disorder from bipolar disorder.

Synthesize the findings to establish a definitive diagnosis.

A current major depressive episode combined with a past manic episode yields a diagnosis of Bipolar I Disorder, current episode depressed.

The presence of even one manic episode in a patient's lifetime precludes the diagnosis of Major Depressive Disorder.

Select the most appropriate evidence-based pharmacotherapy.

Quetiapine is selected as it is a first-line agent for bipolar depression.

Antidepressant monotherapy must be avoided in bipolar disorder to prevent mood destabilization, and quetiapine provides effective treatment while being acceptable during the postpartum/lactation period.

Key Concept

Patients presenting with depressive episodes must be carefully screened for a history of mania or hypomania to distinguish unipolar depression from bipolar depression; antidepressant monotherapy is contraindicated in bipolar disorder due to the risk of precipitating a manic switch.

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