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Difficulty: Very hardDepressive Disorders

A 72-year-old woman is brought to the emergency department by her husband due to a progressive physical decline over the past week. She has a history of persistent depressive disorder since her late 40s and was diagnosed with a superimposed major depressive episode 6 months ago following her husband's stroke. During the current episode, she sequentially failed 8-week trials of sertraline and venlafaxine at maximum tolerated doses. Four weeks ago, her psychiatrist initiated a combination of fluoxetine 40 mg and bupropion 150 mg daily. Over the past 7 days, she has entirely refused to eat or drink, stating that her "stomach has been replaced by a block of ice" and that eating is a sin. On examination, she is mute, exhibits severe psychomotor retardation, and avoids eye contact. Her temperature is 37.0°C (98.6°F), pulse is 110/min, and blood pressure is 105/65 mm Hg. Her mucous membranes are extremely dry, and skin turgor is poor. Laboratory results show a blood urea nitrogen (BUN) of 48 mg/dL and a serum creatinine of 1.9 mg/dL (baseline 4 weeks ago was 0.8 mg/dL). Which of the following is the most appropriate next step in management?

  1. A
    Discontinue the current antidepressants and initiate monotherapy with olanzapine
  2. B
    Discontinue the current antidepressants due to lack of efficacy and initiate duloxetine
  3. Admit for medical stabilization and initiate electroconvulsive therapyAnswer
  4. D
    Discontinue the current antidepressants and initiate tranylcypromine
  5. E
    Maintain the current regimen and screen for a history of past hypomania or mania

Answer

The most appropriate next step is to admit the patient for medical stabilization (including intravenous fluids) and initiate electroconvulsive therapy.
Electroconvulsive therapy (ECT) is the first-line treatment of choice for patients with major depressive disorder who develop life-threatening complications such as severe suicidality, severe malnutrition, or dehydration due to food and fluid refusal. This patient is suffering from unipolar psychotic depression (characterized by the mood-congruent nihilistic delusion that her stomach is a 'block of ice') and has subsequently developed an acute kidney injury from severe dehydration. In this scenario, ECT provides a rapid, life-saving response, whereas waiting 4 to 6 weeks for oral psychopharmacological medications to take effect would likely be fatal. Medical stabilization with intravenous fluids must be initiated concurrently with the psychiatric admission for ECT.

Step-by-Step Solution

1
Identify the primary psychiatric diagnosis.
The patient has Major Depressive Disorder, severe, with psychotic features, specifically demonstrating a nihilistic somatic delusion (Cotard syndrome).
She believes her stomach is a 'block of ice' and eating is a sin, which are classic mood-congruent psychotic features.
2
Assess the medical severity and acuity of the presentation.
The patient has life-threatening inanition (refusal to eat or drink), resulting in severe dehydration, tachycardia, and acute kidney injury (BUN 48 mg/dL, Cr 1.9 mg/dL).
Her physical decline and lab values indicate she is medically unstable and cannot wait weeks for oral medications to take effect.
3
Determine the optimal treatment algorithm for this acute presentation.
Urgent electroconvulsive therapy (ECT) is the gold standard for severe, life-threatening psychotic depression, especially in the geriatric population.
ECT provides the most rapid and effective response when a patient's food and fluid refusal creates a life-threatening medical emergency.
4
Evaluate alternative psychopharmacological interventions.
Oral antidepressant-antipsychotic combinations are too slow, and monoamine oxidase inhibitors (MAOIs) are contraindicated due to the recent fluoxetine use.
Fluoxetine's long half-life necessitates a mandatory 5-week washout period before an MAOI can be safely initiated.

Key Concept

Emergency indications for electroconvulsive therapy (ECT) in Major Depressive Disorder, specifically targeting psychotic depression accompanied by life-threatening inanition.
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Topics

Depressive Disorders

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