A patient presents with immediate pain and paresthesias after a sting, a positive tap test, tachycardia, nausea/vomiting, roving eye movements, muscle spasms, vision impairment, and dysphagia. Dx and treatment?

A patient presents with immediate pain and paresthesias after a sting, a positive tap test, tachycardia, nausea/vomiting, roving eye movements, muscle spasms, vision impairment, and dysphagia. Dx and treatment?

• A. Scorpion venom
• B. Black Widow bite
• C. Lice infestation
• D. Chiggers

Answer: (A)

This presentation reflects a neurotoxic envenomation from a scorpion sting, producing a rapid autonomic storm and neuromuscular hyperexcitability. Scorpion venom alters ion channel function in nerves and muscles, leading to widespread symptoms beyond the local sting site. The patient’s immediate pain and paresthesias, a positive tapping sign over a nerve, tachycardia, nausea/vomiting, and cranial/bulbar signs such as roving eye movements, muscle spasms, vision impairment, and dysphagia all fit this pattern. These features point to systemic venom effects rather than a simple local reaction or a non-neurotoxic arthropod bite. Treatment centers on removing the venom’s effects with a specific antivenom, which can blunt the autonomic and neuromuscular symptoms. Supportive care is essential: ensure airway and breathing, monitor cardiovascular status, provide IV fluids, and treat pain and muscle spasms with appropriate medications such as benzodiazepines. Intensive monitoring is warranted for progression to respiratory compromise, and escalation to ICU care may be needed if symptoms are severe. Other bites such as black widow typically cause intense muscle cramping and generalized pain but less often involve cranial nerve–related signs like roving eye movements or dysphagia. Lice infestation and chiggers cause only localized itching and dermatitis, not these systemic neurotoxic features.

This presentation reflects a neurotoxic envenomation from a scorpion sting, producing a rapid autonomic storm and neuromuscular hyperexcitability. Scorpion venom alters ion channel function in nerves and muscles, leading to widespread symptoms beyond the local sting site. The patient’s immediate pain and paresthesias, a positive tapping sign over a nerve, tachycardia, nausea/vomiting, and cranial/bulbar signs such as roving eye movements, muscle spasms, vision impairment, and dysphagia all fit this pattern. These features point to systemic venom effects rather than a simple local reaction or a non-neurotoxic arthropod bite.

Treatment centers on removing the venom’s effects with a specific antivenom, which can blunt the autonomic and neuromuscular symptoms. Supportive care is essential: ensure airway and breathing, monitor cardiovascular status, provide IV fluids, and treat pain and muscle spasms with appropriate medications such as benzodiazepines. Intensive monitoring is warranted for progression to respiratory compromise, and escalation to ICU care may be needed if symptoms are severe.

Other bites such as black widow typically cause intense muscle cramping and generalized pain but less often involve cranial nerve–related signs like roving eye movements or dysphagia. Lice infestation and chiggers cause only localized itching and dermatitis, not these systemic neurotoxic features.