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Difficulty: MediumNeurocognitive Disorders

A 69-year-old man is evaluated in the hospital after being admitted for urosepsis. Over the past 24 hours, he has become profoundly confused and agitated, attempting to strike the nursing staff and pull out his intravenous lines. His medical history is significant for an 11-month history of progressive cognitive decline. His wife reports that over the past year, he has had episodes of staring blankly for prolonged periods, recurrently claims to see small animals running across the living room floor, and frequently kicks and thrashes while asleep. Physical examination earlier in the admission revealed increased resistance to passive movement in all four extremities and a slow, shuffling gait. The primary team decides that pharmacological intervention is urgently necessary to prevent the patient from harming himself and staff. Administration of which of the following medications is most likely to provoke a severe, potentially fatal deterioration characterized by extreme rigidity and autonomic dysfunction in this patient?

  1. A
    Quetiapine
  2. B
    Diphenhydramine
  3. HaloperidolAnswer
  4. D
    Lorazepam
  5. E
    Donepezil

Answer

Haloperidol
The correct answer is haloperidol. The patient's baseline history of fluctuating cognition (staring blankly), formed visual hallucinations (seeing small animals), REM sleep behavior disorder (kicking/thrashing while asleep), and parkinsonism (rigidity, shuffling gait) is highly characteristic of Dementia with Lewy Bodies (DLB). Currently, he is experiencing delirium secondary to urosepsis. Patients with DLB have a profound, well-documented sensitivity to neuroleptic medications, particularly typical antipsychotics with strong dopamine (D2) receptor antagonism. Administration of haloperidol in these patients can precipitate a severe, potentially fatal neuroleptic sensitivity reaction. This reaction is characterized by irreversible worsening of parkinsonism, extreme rigidity, impaired consciousness, and severe autonomic dysfunction (resembling neuroleptic malignant syndrome).

Step-by-Step Solution

1
Identify the patient's underlying primary neurocognitive disorder based on the historical and physical findings.
The patient has an 11-month history of fluctuating cognition, visual hallucinations, REM sleep behavior disorder, and parkinsonism, which firmly points to a diagnosis of Dementia with Lewy Bodies (DLB).
Accurately diagnosing the baseline neurocognitive condition is essential to guide safe pharmacological management of the superimposed acute delirium.
2
Recognize the specific pharmacological contraindications uniquely associated with this baseline diagnosis.
Patients with DLB have a profound, potentially fatal sensitivity to dopamine D2 receptor antagonists, particularly first-generation (typical) antipsychotics.
Exposure to these agents can precipitate irreversible motor deterioration, severe rigidity, and autonomic instability resembling neuroleptic malignant syndrome.
3
Evaluate the given medication options to identify the contraindicated agent.
Haloperidol is a high-potency typical antipsychotic and carries the highest risk of causing this severe neuroleptic sensitivity reaction.
Identifying the most dangerous medication ensures patient safety and avoids iatrogenic morbidity during acute behavioral disturbances.

Key Concept

Patients with Dementia with Lewy Bodies (DLB) have an extreme sensitivity to neuroleptics, particularly typical antipsychotics like haloperidol, which can precipitate life-threatening motor and autonomic deterioration.
Estimated Time:1m 15s
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Topics

Neurocognitive Disorders

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