It’s part 2 of “Name that Poisonous Beast!”. Here we go!
Name this poisonous beast!
A)
And his slithery friend…
B)
And what about this guy?
C)
- A) Rattlesnake (pit viper) [Crotalinae]: venom with digestive enzymes and spreading factors
- In family with Cottonmouths and Copperheads
- Local effects: pain and edema progress to ecchymosis and bullae (mark borders)
- Systemic effects:
- Nausea/vomiting/diarrhea, weakness, lightheadedness, diaphoresis, chills
- Hypotension, tachycardia, tachypnea
- Coagulopathy: elevated PT/INR, dec platelets, dec fibrinogen, inc FSP
- Neurotoxicity: oral paraesthesia (metallic), fasciculations, AMS, seizures
- Rare complications: compartment syndrome, rhabdomyolysis, shock, direct cardiotoxicity/allergy to venom
- Treatment:
- Pre-hospital: supportive care/extremity in functional position at level of heart
- NOT recommended: tourniquets, incision and oral suction of venom
- ED: supportive care, wound care/tetanus, antivenom (Crofab) for mod/severe envenomation and/or bite site close to airway; transfusion (pRBC, FFP, platelets) only if sig bleeding s/p antivenom
- Start with 4-6 vials, then either maintenance therapy (2 vials q6h x3) or continued dosing based on symptom resolution; prep for allergic rxn
- Pre-hospital: supportive care/extremity in functional position at level of heart
- B) Coral Snake (Elapidae) [Micrurus]: neurotoxic venom (competitive inhibition of muscarinic acetylcholine receptors; pre- and/or post-synaptic binding)
- Local effects: no pain to mild pain/swelling, paraesthesia
- Systemic effects:
- Nausea/vomiting, abdominal pain, dizziness
- Within 12 hours neurotoxicity: bulbar paralysis (ptosis, opthalmoplegia, dysphagia, dysarthria) generalized weakness—>resp depression/failure, rarely seizures
- Rare: local tissue damage, coagulopathy (with Micrurus lemniscatus halleri)
- Treatment:
- Prehospital: supportive care/extremity in functional position below level of heart
- NOT recommended: tourniquets, incision and oral suction of venom
- ED: Wound care/tetanus, respiratory support, antivenom for all envenomations
- North American snake: 3-5 vials antivenom but up to 10+ vials; prep for allergic rxn
- If no antivenom available, atropine/glycopyrrolate prior to neostigmine (only works if blockade is post-synaptic)
- Prehospital: supportive care/extremity in functional position below level of heart
- C) King Snake: harmless!
- “Red on yellow, kill a fellow; red on black, venom lack”