A 28-year-old man is brought to the emergency department by police after he was found runn… — USMLE Step 2 CK

A 28-year-old man is brought to the emergency department by police after he was found running through traffic, shouting that he is "being hunted by assassins." He is highly agitated, uncooperative, and combative. The patient has a history of major depressive disorder. Medical records indicate he takes citalopram. A friend who arrives at the ED reports the patient recently started taking an over-the-counter herbal supplement for mood enhancement and was also prescribed linezolid for a skin infection at an urgent care clinic two days ago. His temperature is $39.6^\circ\text{C}$ ( $103.3^\circ\text{F}$ ), pulse is $134/\text{min}$ , respirations are $24/\text{min}$ , and blood pressure is $172/98\text{ mm Hg}$ . Physical examination reveals severe diaphoresis and mydriasis. Neurological examination is notable for hyperreflexia and sustained bilateral ankle clonus. The patient is delirious, disoriented to time and place, and violently resists examination, screaming, "You're not touching me! I'm leaving!" as he attempts to climb off the stretcher. Which of the following is the most appropriate next step in the management of this patient?

A
Withhold pharmacological intervention until surrogate consent is obtained from his next of kin
B
Administer intramuscular haloperidol to manage acute agitation
C
Administer oral bromocriptine to reverse the medication-induced toxidrome
Administer intravenous lorazepam under emergency implied consentAnswer
E
Contact the patient's employer to warn them of his severe psychotic state

Answer

Administer intravenous lorazepam under emergency implied consent

The correct answer involves recognizing both the psychiatric/medical emergency and the ethical doctrine required to manage it. This patient presents with the classic triad of Serotonin Syndrome (altered mental status, autonomic instability, and neuromuscular hyperactivity) triggered by the interaction of citalopram, linezolid (which has weak MAOI activity), and likely St. John's wort. Specifically, the presence of hyperreflexia and sustained ankle clonus distinguishes Serotonin Syndrome from Neuroleptic Malignant Syndrome (NMS), which typically presents with lead-pipe rigidity and hyporeflexia. The initial treatment for severe agitation and autonomic instability in Serotonin Syndrome is supportive care and intravenous benzodiazepines, such as lorazepam. Ethically, because the patient is delirious and lacks decision-making capacity in a life-threatening scenario, physicians are authorized to provide immediate, life-saving interventions under the principle of emergency implied consent, bypassing the immediate need for surrogate authorization.

Step-by-Step Solution

Diagnose the acute medical condition based on the clinical vignette.

The combination of citalopram (SSRI), linezolid (MAOI properties), and an herbal supplement (likely St. John's wort) has precipitated Serotonin Syndrome, characterized by altered mental status, autonomic instability, and neuromuscular hyperactivity (clonus/hyperreflexia).

Recognizing the toxidrome is required to select the correct pharmacological intervention.

Assess the patient's decision-making capacity and legal status.

The patient is actively delirious, disoriented, and experiencing psychotic symptoms; therefore, he lacks the capacity to refuse medical treatment.

Capacity must be determined before overriding a patient's refusal of care.

Determine the appropriate ethical and legal framework for treatment.

Because this is a life-threatening emergency (severe hyperthermia and autonomic instability) and the patient lacks capacity, the physician must act immediately under the doctrine of emergency implied consent.

Waiting for a surrogate or court order in a true emergency leads to preventable mortality.

Key Concept

Diagnosis of Serotonin Syndrome and the application of emergency implied consent in life-threatening psychiatric/medical emergencies.

Estimated Time:1m 30s

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Topics

More questions from this topic