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Toxicology – Scorpion Envenomation
Source
Venomous scorpions are found in various regions worldwide. In North America, the bark scorpion is the most clinically significant species, commonly found in the southwestern United States and Mexico. Other dangerous species exist in parts of Africa, India, and the Middle East.
Typical Presentation
Patients typically present after a sudden, painful sting. In more severe cases, symptoms may rapidly progress to systemic toxicity, especially in vulnerable individuals such as children or the elderly.
Clinical Features
Most stings in North America cause localized pain, redness, and swelling. More severe envenomations may produce systemic symptoms including tachycardia, abnormal heart rhythms, elevated blood pressure, hyperthermia, excessive sweating, drooling, dilated pupils, abnormal eye movements (nystagmus), muscle twitching, clonus, and respiratory distress. Severe cases may also be associated with complications such as pancreatitis or coagulopathy.
Mechanism of Action
Scorpion venom contains a combination of neurotoxic and cytotoxic components. It affects ion channels, particularly by activating sodium channels and inhibiting potassium channels, leading to prolonged nerve and muscle excitation and autonomic instability.
Management
Treatment is primarily supportive. Pain is managed with analgesics, often including opioids. Benzodiazepines are used for muscle spasms and agitation. In cases of significant systemic toxicity, antivenom (such as Centruroides-specific antivenom) may be administered when available.
Key Points
Source
Venomous scorpions are found in various regions worldwide. In North America, the bark scorpion is the most clinically significant species, commonly found in the southwestern United States and Mexico. Other dangerous species exist in parts of Africa, India, and the Middle East.
Typical Presentation
Patients typically present after a sudden, painful sting. In more severe cases, symptoms may rapidly progress to systemic toxicity, especially in vulnerable individuals such as children or the elderly.
Clinical Features
Most stings in North America cause localized pain, redness, and swelling. More severe envenomations may produce systemic symptoms including tachycardia, abnormal heart rhythms, elevated blood pressure, hyperthermia, excessive sweating, drooling, dilated pupils, abnormal eye movements (nystagmus), muscle twitching, clonus, and respiratory distress. Severe cases may also be associated with complications such as pancreatitis or coagulopathy.
Mechanism of Action
Scorpion venom contains a combination of neurotoxic and cytotoxic components. It affects ion channels, particularly by activating sodium channels and inhibiting potassium channels, leading to prolonged nerve and muscle excitation and autonomic instability.
Management
Treatment is primarily supportive. Pain is managed with analgesics, often including opioids. Benzodiazepines are used for muscle spasms and agitation. In cases of significant systemic toxicity, antivenom (such as Centruroides-specific antivenom) may be administered when available.
Key Points
- Scorpions fluoresce under ultraviolet (Wood’s lamp) light, aiding identification.
- Severe toxicity is more likely in children and older adults.
- Antivenom should be considered in patients with systemic symptoms.
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