Rattlesnake bites and surgical decompression: results using a laboratory model

Area of Science:

• Toxicology
• Veterinary Medicine
• Surgical Research

Background:

• Pit viper envenomation can lead to significant tissue damage and increased compartment pressures.
• Fasciotomy is a surgical procedure sometimes used to relieve pressure in envenomated limbs.
• The efficacy of fasciotomy in preventing necrosis and managing compartment syndrome in pit viper bites requires further investigation.

Purpose of the Study:

• To evaluate the effect of fasciotomy on tissue pressure and muscle necrosis following pit viper envenomation in canine hind limbs.
• To determine if fasciotomy can prevent muscle necrosis or reduce compartment pressures after envenomation.
• To assess the utility of intracompartment pressure measurements in differentiating venom injection sites.

Main Methods:

• Southern Pacific rattlesnake venom was injected into canine hind limbs: subcutaneous tissues, intact anterolateral compartment, or anterolateral compartment post-fasciotomy.
• Interstitial fluid pressure, limb girth, and surface temperature were monitored for 48 hours.
• Microscopic examination of compartment contents was performed post-mortem.

Main Results:

• Intracompartment pressure elevations occurred only with intracompartment venom injections.
• Fasciotomy did not prevent muscle necrosis but did reduce maximum compartment pressures.
• Microscopic pressure measurements effectively distinguished between subcutaneous and intramuscular envenomations.

Conclusions:

• Tissue pressure measurements are valuable for assessing rattlesnake envenomations.
• Fasciotomy alone may not prevent muscle necrosis but can reduce compartment pressures.
• Objective pressure monitoring is essential for determining the need for surgical decompression in pit viper envenomations.