Paramedics arrive at the emergency department with a 24-year-old male who was found severe… — USMLE Step 2 CK

Paramedics arrive at the emergency department with a $24$ -year-old male who was found severely agitated and disoriented outside a music festival. Bystanders reported seeing him consume a crystalline powder they believed to be "Molly" (MDMA) several hours prior. The patient's roommate, who accompanied him in the ambulance, notes that the patient has a history of major depressive disorder and recently began taking a daily medication prescribed through an online telehealth service.

Upon evaluation in the trauma bay, the patient is combative and profoundly confused. Vital signs demonstrate a temperature of $39.6^\circ\text{C}$ ( $103.3^\circ\text{F}$ ), pulse of $142/\text{min}$ , respiratory rate of $24/\text{min}$ , and blood pressure of $175/105\text{ mm Hg}$ . The physical examination is notable for excessive diaphoresis, bilateral pupillary dilation, and extreme muscle rigidity in the lower extremities accompanied by spontaneous ankle clonus.

Which of the following represents the most appropriate next step in patient care?

Administer intravenous lorazepamCevap
B
Administer intramuscular haloperidol
C
Initiate empiric intravenous ceftriaxone and vancomycin
D
Arrange immediate transfer for inpatient psychiatric admission
E
Notify local law enforcement regarding the illicit drug ingestion

Cevap

The most appropriate next step is to administer intravenous lorazepam.

The patient exhibits classic manifestations of Serotonin Syndrome, which is characterized by the triad of altered mental status, autonomic hyperactivity (fever, tachycardia, hypertension, diaphoresis), and neuromuscular abnormalities (hyperreflexia, clonus). This was precipitated by the synergistic serotonergic effect of MDMA (which increases presynaptic serotonin release) and a newly prescribed medication for depression (likely a selective serotonin reuptake inhibitor). The most appropriate initial step in management is the administration of intravenous benzodiazepines, such as lorazepam. Benzodiazepines reduce agitation, blunt the hyperadrenergic response, and decrease muscle contractions, which is the primary mechanism for lowering body temperature in these patients. If symptoms are refractory to benzodiazepines and supportive care, cyproheptadine (a serotonin antagonist) can be administered.

Adım Adım Çözüm

Analyze the patient's symptoms and vital signs.

The patient presents with hyperthermia, tachycardia, hypertension, altered mental status, diaphoresis, mydriasis, and marked hyperreflexia with ankle clonus.

Identifying the specific pattern of autonomic instability and neuromuscular hyperactivity is crucial for distinguishing between various toxidromes.

Incorporate the patient's history and medication exposures.

The ingestion of MDMA (a synthetic amphetamine that promotes serotonin release) combined with a newly prescribed antidepressant (likely an SSRI or MAOI) strongly supports a diagnosis of Serotonin Syndrome.

MDMA combined with other serotonergic agents classically triggers Serotonin Syndrome.

Determine the optimal acute management for the identified toxidrome.

The first-line therapy for Serotonin Syndrome focuses on supportive care and the administration of intravenous benzodiazepines.

Benzodiazepines safely mitigate the hyperadrenergic state, control agitation, and reduce the muscle rigidity that drives the dangerous hyperthermia.

Anahtar Kavram

Diagnosis and acute management of Serotonin Syndrome triggered by MDMA and antidepressants.

Tahmini Süre:1m 30s

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