A 25-year-old woman is brought to the outpatient psychiatric clinic by her sister due to a… — USMLE Step 2 CK

A 25-year-old woman is brought to the outpatient psychiatric clinic by her sister due to a 4-week history of profound sadness, lack of motivation, and sleeping up to 14 hours daily. For the past week, the patient has been hearing an unfamiliar voice repeatedly telling her she is "hopeless and already dead." Her past psychiatric history is notable for a 3-week hospitalization two years ago when she exhibited extremely rapid speech, required only two hours of sleep per night, and harbored grandiose delusions about being a spiritual prophet. Following her discharge from that hospitalization, she returned to her baseline functioning and experienced no mood or psychotic symptoms until the current episode. The patient currently takes no medications. Vital signs are within normal limits. Laboratory evaluation reveals a thyroid-stimulating hormone (TSH) level of $1.4 \mu U/mL$ (normal: $0.5-5.0 \mu U/mL$ ) and a free thyroxine (T4) level of $0.8 ng/dL$ (normal: $0.9-1.7 ng/dL$ ). Which of the following is the most appropriate next step in management?

Initiate quetiapineAnswer
B
Initiate sertraline
C
Diagnose schizophrenia and initiate risperidone
D
Initiate levothyroxine
E
Initiate citalopram and selegiline

Answer

Initiate quetiapine

The patient has a history of a distinct manic episode (decreased need for sleep, grandiose delusions, severe impairment requiring hospitalization), which establishes a diagnosis of Bipolar I Disorder. She is currently experiencing an acute major depressive episode with mood-congruent psychotic features. The most appropriate treatment for acute bipolar depression includes agents like quetiapine, lurasidone, or cariprazine. Quetiapine is particularly appropriate here as it is a second-generation antipsychotic that effectively treats bipolar depression while also addressing the patient's acute psychotic symptoms (auditory hallucinations).

Step-by-Step Solution

Analyze the patient's psychiatric history.

The history of a manic episode with grandiose delusions two years ago establishes a diagnosis of Bipolar I Disorder.

A single manic episode is sufficient to diagnose Bipolar I Disorder, which dictates all future pharmacological management of mood episodes.

Evaluate the current clinical presentation.

The patient is experiencing a severe major depressive episode with mood-congruent psychotic features (hearing voices saying she is dead).

Identifying the current phase of the bipolar illness (acute depression with psychosis) is necessary to select an agent that targets both mood and psychosis.

Interpret the laboratory findings.

The normal TSH with a borderline low Free T4 rules out primary hypothyroidism as the cause of her severe depression.

Medical causes of depressive symptoms must be ruled out, but misinterpreting minor lab variations can lead to inappropriate treatment.

Select the most appropriate pharmacotherapy.

Quetiapine is selected as it is FDA-approved for bipolar depression and possesses antipsychotic properties.

Standard antidepressants (SSRIs) are contraindicated as monotherapy in Bipolar I due to the risk of manic switch, and the patient requires an agent that treats both depression and psychosis.

Key Concept

Management of acute bipolar depression with psychotic features involves avoiding antidepressant monotherapy and utilizing an atypical antipsychotic like quetiapine or lurasidone.

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