Clinical Presentation of Medetomidine-Involved Opioid Overdoses-Chicago, 2024
Kimberly Gressick1,2, Shawn A Thomas3,4, Amy Nham1,2
1Epidemic Intelligence Service, CDC, Atlanta, GA, USA.
Summary
Medetomidine exposure in opioid overdoses caused severe hypertension and altered mental status, requiring intensive care. This highlights the need for increased clinical awareness of this dangerous drug adulterant.
Area of Science:
- Emergency Medicine
- Toxicology
- Pharmacology
Background:
- Medetomidine, an alpha-2 adrenergic agonist, was identified as a U.S. drug adulterant in 2022.
- A cluster of opioid overdoses with unusual clinical features linked to medetomidine was reported in Chicago in May 2024.
Purpose of the Study:
- To characterize the clinical features and outcomes of patients with suspected opioid-involved overdoses during a medetomidine outbreak.
- To identify the specific toxidrome associated with medetomidine exposure.
Main Methods:
- Retrospective chart review of patients presenting to Chicago emergency departments with suspected opioid overdoses.
- Classification of cases as confirmed, probable, or suspected based on clinical criteria and laboratory results.
- Descriptive statistics and logistic regression to assess outcomes associated with medetomidine exposure.
Main Results:
- 12 laboratory-confirmed cases of medetomidine exposure were identified among 181 suspected opioid overdose patients.
- Confirmed medetomidine exposure was associated with persistent altered mental status, marked hypertension, and bradycardia.
- Confirmed/probable cases had higher odds of elevated blood pressure, hospital admission, and ICU admission compared to suspected cases.
Conclusions:
- Medetomidine exposure presents a distinct toxidrome including hypertension, bradycardia, and prolonged altered mental status.
- The outbreak necessitated increased clinical vigilance and preparedness for medetomidine-related overdoses.
- Heightened awareness and prompt clinical stabilization are crucial for managing medetomidine toxicity.
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