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Antivenom Administration After Rattlesnake Envenoming in Arizona Does Not Directly Diminish Pain.
Vance G Nielsen1, Darien L Stratton2, Tyler M Hoelscher3
1Department of Anesthesiology, The University of Arizona College of Medicine, Tucson, AZ 85724, USA.
Toxins
|December 27, 2024
Summary
Antivenom may offer minimal pain relief for rattlesnake bites. Even high doses of antivenom (Anavip and Crofab) did not significantly reduce severe or opioid-refractory pain in envenomation patients.
Area of Science:
- Toxicology
- Pharmacology
- Emergency Medicine
Background:
- Rattlesnake envenomation causes variable pain, often resistant to opioids.
- The direct analgesic effect of antivenom is not well understood.
Purpose of the Study:
- To evaluate the efficacy of antivenom in managing pain following rattlesnake envenomation.
- To compare pain control between Anavip and Crofab antivenoms.
Main Methods:
- Retrospective chart review of 289 rattlesnake envenomation patients (2018-2022).
- Patients categorized by pain severity: no pain, controlled pain, or opioid-refractory pain.
- Analysis of antivenom type (Anavip vs. Crofab) and dosage in relation to pain control.
Main Results:
- Higher antivenom doses were used in patients with more severe pain (opioid-refractory group).
- Despite increased doses, antivenom alone showed minimal analgesic benefit in severe pain cases.
- No significant difference in Anavip vials used between controlled and refractory pain groups.
Conclusions:
- Antivenom administration alone appears to have limited direct analgesic effects for rattlesnake bite-induced pain.
- Further research is needed to optimize pain management strategies in envenomation.
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