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TOXICOLOGIC EMERGENCIES

TOXICOLOGIC EMERGENCIES. Toxicologic Emergencies. Signs will vary depending on character of toxic compound Toxicity can result from exposure via many routes Ingestion Inhalation Skin contact Injection. Toxicologic Emergencies. Top 10 Toxicoses (2005)

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TOXICOLOGIC EMERGENCIES

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  1. TOXICOLOGIC EMERGENCIES

  2. Toxicologic Emergencies • Signs will vary depending on character of toxic compound • Toxicity can result from exposure via many routes • Ingestion • Inhalation • Skin contact • Injection

  3. Toxicologic Emergencies • Top 10 Toxicoses (2005) • Human medication (ibuprofen, acetominophen, anti-depressants) • Insecticides—flea and tick • Rodenticides—anticoagulants • Veterinary medication • Household cleaners—bleach, detergents • Plants—sago palm, lily, azalea • Herbicides • Chocolate—highest in food category • Home improvement products—solvents, adhesives, paint, wood glue • Fertilizers

  4. Toxicologic Emergencies • HISTORY • ASSESS • STABILIZE • Administer oxygen • Control seizures • Correct cardiovascular abnormalities • DECONTAMINATION • Emetics • Activated charcoal • Gastointestinal protectants • CONTROL CLINICAL SIGNS • GOOD NURSING CARE • PREVENT FURTHER EXPOSURE

  5. Ocular exposure Rinse eyes with copious saline for 20-30 min Chemical burns treated with lubricating ointment and suture lids closed Use corticosteroids only if corneal epithelium is intact Skin exposure Bathe with mild detergent (liquid dish soap) Bather should wear protective clothing (gloves, goggles) Toxicologic Emergencies: external exposure

  6. Toxicologic Emergencies • Ingestion • Induce vomiting—if chemical not caustic; animal conscious, not seizing • Syrup of ipecac, apomorphine, Xylazine, H2O2 (not reliable), salt (not recommmended) • Dilute caustic substances with milk, water • Gastric lavage—large bore stomach tube; light anesthesia w/ endotracheal tube • Administer absorbents—activated charcoal inhibits GI absorption • Give orally or via stom tube • Enemas/cathartics to eliminate toxins more rapidly

  7. Toxicological Emergencies ACTIVATED CHARCOAL WITH OR WITHOUT A CATHARTIC

  8. Toxicologic Emergencies • Methylxanthines (caffeine, theobromine, theophylline • Found in: coffee, tea, chocolate, other stimulants • Toxic Dose of caffeine and theobromine in dogs: 100-200 mg/kg; (other sources: 250-500mg) • Milk Chocolate—44-60 mg/oz Dark chocolate-150 mg/oz Baking Chocolate—390-450 mg/oz

  9. Toxicologic Emergencies • Clinical signs of methylxanthine/chocolate toxicosis (caffeine, theobromine) • Increased HR, RR • Anxiety • Vomiting/diarrhea • Seizures, coma • Cardiac arrhythmias • Treatment • Induce vomiting • Activated charcoal • Control seizues • Fluid therapy

  10. Toxicologic Emergencies • Rodenticides 1. Anticoagulants (warfarin, pindone, bromadiolone, brodifacoum) • Work by binding Vit K, which inhibits synthesis of factors II, VI, IX, X • This effect occurs within 6-40 h in a dog; effect may last 1-4 wk

  11. Toxicological Emergencies • Clinical signs (occur after depletion of clotting factors) • Lethargy • Vom/dia with blood; melena • Anorexia • Ataxia • Dyspnea • Epistaxis, scleral hemorrhage, pale mm • Treatment • Vit K: 3-5 mg/kg PO for up to 21 d depending on anticoagulant used • Induce vomiting; activated charcoal • Whole blood transfusion if anemic

  12. Toxicologic Emergencies • Rodenticides • Cholecalciferol—Vit D3; used in Quintox, rampage, Rat-Be-Gone -causes Ca++ reabsorption from bone, intestine, kidneys causing hypercalcemia (>11.5 mg/dl) and cardiotoxicity • Clinical signs (12-36 h after ingestion) • Kidney failure • Anorexia • Vomiting • Tissue mineralization • Cardiovascular abnormalities • Muscle weakness • arrhythmias

  13. Toxicological Emergencies • Diagnosis • Hx of exposure • Usually discovered on routine Chem panel (↑blood Ca++) • Treatment • Induce vom/activated charcoal if ingestion occurred with 2 h • Furosemide x 2-4 wk; increases Ca++ excretion in urine • Prednisone x 2-4 wk; decreases Ca++ reabsorption from bones/intesine • Calcitonin to lower blood Ca++ concentration

  14. Toxicologic Emergencies • Rodenticides • Bromethalin -uncoupler of oxidative phosphorylation in CNS (stops production of ATP) -Causes cerebral edema -found in Assault, Vengence, Trounce -Toxic Dose Dog: 4.7 mg/kg Cats: 1.8 mg/kg Clinical signs (>24 h after ingestion of high dose; 1-5 d--low dose) • Excitement, tremors, seizures • Depression, ataxia • Rx (will take 2-3 wk to know if animal will survive) • Purge GI tract if exposure recent • Reduce cerebral edema with Mannitol and glucocorticoids • Seizure control with Diazepam and Phenobarbital

  15. Toxicologic Emergencies • Acetaminophen • Common OTC drug for analgesia • Toxic dose: Dog—160-600 mg/kg Cat—50-60 mg/kg (2 doses in 24 h is almost always fatal) • Clinical signs (starts within 1-2 h of ingestion) • Vomiting, salivation • Facial and paw edema • Depression • Dyspnea • Pale mm • Cyanosis due to methemoglobinemia • Px—poor • Rx • Induce vom/activated charcoal • Antidote: N-Acetylcysteine (loading dose of140-280 mg/kg PO, IV, then at 70 mg/kg PO, IV QID x 2-3 d

  16. Toxicological Emergencies

  17. Toxicologic Emergencies • Metals • Lead toxicity more common in dogs than cats • Source • Lead paint (prior to 1970’s) is primary source • Batteries, linoleum, plumbing supplies, ceramic containers, lead pipes, fishing sinkers, shotgun pellets • Clinical signs (Usually involves signs of GI and nervous systems) • Anorexia • Vom/dir • Abd pain -CNS signs do not show initially • Blindness, seizures, ataxia, tremors, unusual behavior

  18. Toxicologic Emergencies • Metals • Lead toxicity • Dx • Large # nucleated RBC’s; basophilic stipling • Blood lead conc >35 μg/ml • Rx • Remove lead from GI tract (cathartic, Sx) • Chelators (to bind the Pb in blood stream and hasten its removal) -Calcium EDTA (ethylene diamine tetra acetic acid) -Penicillamine • IV fluids for dehydration and to speed removal via kidneys • Diazepam, Phenobarbital to control seizures

  19. Toxicologic Emergencies • Metals • Zinc Toxicosis • Usually from ingested pennies, galvanized metal, zinc oxide ointment • Clinical signs • Vomiting • CNS depression • Lethargy • Dx • Hx of exposure • Clinical signs • Rx • Remove metal objects endoscopically or surgically • IV fluid therapy • Ca EDTA chelation

  20. Toxicologic Emergencies • Ethylene Glycol (antifreeze; sweet taste) • Lethal dose: Cat—1.5 ml/kg Dog—6.6 ml/kg • Signs (onset within 12 h of ingestion) • CNS depression, ataxia (may appear intoxicated) • Vomiting • PD/PU • Seizures, coma, death • Acute renal failure • Dx • Hx, signs • Ethylene Glycol Poison Test—an 8 min test used in cats and dogs • Calcium oxalate crystals • Rx • Emesis, adsorbents if ingestion within 3 h of presentation • IV fluids, NaBicarb for acidosis • Ethanol inhibits ethylene glycol metabolism Dogs (Cats): 20% ethanol—5.5 (5.0) ml/kg q6h x 5, then q8h x 4 • 4-methylpyrazole has been shown to be effective

  21. Toxicological Emergencies THE PROBLEM THE SOLUTION

  22. Toxicologic Emergencies • Snail Bait (Metaldehyde, methiocarb) • Metaldehyde mechanism unknown • Methiocarb is a carbamate and parasympathomimetic • Signs • Hypersalivation • Incoordination • Muscle fasciculations • Hyperesthesia • Tachycardia • Seizures • Rx • Emesis and absorbents • Pentobarbital, muscle relaxants to control CNS hyperactivity

  23. Toxicologic Emergencies • Garbage Toxicity • Common in dogs; not in cats • Enterotoxin-producing bacteria include Strep, Salmonella, Bacillus • Signs (within min to h after ingestion) • Anorexia, lethargy • Vom/dia • Ataxia, tremors • Enterotoxic shock can cause death • Rx • IV Fluid therapy • Broad-spec antibiotics • Intestinal protectants • Muscle relaxers or Valium may be needed to control tremors • Corticosteroids to counter endotoxic shock

  24. Toxicologic Emergencies • Insecticides • Pyrethrins, Pyrethroids, Permethrins • Common ingredients of flea/tick sprays, dips, shampoos, etc • If used according to instructions, toxicity rarely occurs; if overused, toxicity can result • Signs • Hypersalivation • Vom/dia • Tremors, hyperexcitability or lethargy • Later, dyspnea, tremors, seizures can occur • Rx • Bathe animal to remove excess • Induce vomiting/charcoal/cathartics for ingestion • Diazepam may be necessary for mild tremors • Methocarbamol, a muscle relaxer, for moderate-severe tremors • Atropine for hypersalivation and bradycardia

  25. Toxicologic Emergencies • Insecticides • Organophosphates and Carbamates • Inhibit cholinesterase activity (break down of Ach is inhibited) • Highly fat-soluble; easily absorbed from skin and GI tract • Found in dips, sprays, dusts, etc for fleas and ticks, and flys • Signs • Salivation • Lacrimation • Urinary incontinence • Diarrhea • Dyspnea • Emesis, gastrointestinal cramping -May progress to • Seizures, coma, resp depression, death • Rx • Bathe animal • Charcoal if ingested • Atropine (0.2-0.4 mg/kg; half IV, half IM or SQ) • Praloxime chloride (20 mg/kg BID till signs subside)—reactivates cholinesterase

  26. Toxicologic Emergencies • Plant Toxicity • Most common in confined and juvenile animals • Usually from ornamental, indoor plants • Severity varies with plants • ID scientific plant name (florist, greenhouse) • Araceae family (most from this family) • Dumb cane, split-leaf philodendron • Contain calcium oxalate crystals • Signs • Hypersalivation, oral mucosal edema, local pruritis -Large amount of plant may cause: • Vomiting, dysphagia, dyspnea, abd pain, vocalization, hemorrhage • Rx • Rinse mouth with milk or water to remove Ca Oxalate crystals • GI decontamination (protectants) may be needed

  27. Dumb Cane (Dieffenbachia) aka Mother-in-law’s tongue Oral irritation; intense burning, excess salivation

  28. Split Leaf Philodendron Oxalate crystals like Dieffenbachia Oral irritation; intense burning, excess salivation

  29. Lily of the Valley Contains cardiac glycosides Cardiac arrythmias, death

  30. Azalea (Rhododendron) Hypotension, cardiovascular collapse, death

  31. Sago Palm ALL PARTS OF THE PLANT ARE TOXIC Coagulopathy Liver failure

  32. Toxicologic Emergencies • Phone advice to give owners (legal issues) • Protect yourself from exposure before handling animal • Gloves, protective clothing • Protect yourself from animal because poisoned animals may act strangely • Protect animal from further exposure by removing pet from source • Bring sample of vomit, feces, urine • Bring container/package that toxin was in and a sample of the toxin (plant material, rat bait, etc)

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