Tox 2 Flashcards
Gossypol- tox type
Cardiac/hematopoietic
Gossypol- source
Cotton seed
Gossypol- MOA
Binds and inhibits dehydrogenase in oxidative stress response and less energy and protein production; chelates iron causing anemia and reduces protein availability
Gossypol- species
Non-ruminants more sensitive, horses less effected
Gossypol- CS
Anemia, general weight loss, weakness; end result- myocardial necrosis and CHF
Gossypol- dx
History, chemical analysis
Gossypol- necropsy lesions
Cardiac necrosis, edematous, pale, mottled heart with vaculoization
Gossypol- tx
High protein diet with vitamin A, iron, lysine
Blister beetle- toxic agent
Cantharidin
Cantharidin- species effected
Horses
Cantharidin- lethal dose
6-250 beetles
Cantharidin- tox type
Heart and GI
Cantharidin- MOA
Inhibition of protein phosphatases leading to cardiac toxicity, mucosal irritant
Cantharidin- CS
Colic, PU, diaphragm contraction with heartbeat, severe iritation/ulceration of epithelia, cardiac toxicity
Cantharidin- dx
Presence of bugs; ulceration of MM; labs: hypocalcemia, increased BUN; cardiac necrosis
Cantharidin- tx
GI decontamination and protection (sucralfate), antibiotics
What is the most common toxicity site
Kidney- proximal convoluted tubule
Why is the proximal convoluted tubule most susceptible to toxicity
p450 and cysteine conjugation of B-lyase- leads to bioactivation of metabolites which cause damage; loose epithelium allows compounds to enter cells; increased anion, cation, metal transport can lead to accumulation and ischemic injury.
Describe acute kidney injury (AKI)
Decreased GFR, renal azotemia from damage to tubule/GFR/vasculature
AKI- CS
V, GI bleed, PUPD leading to olig/anuria
Chronic renal failure (CRF)- describe
Related to secondary compensatory changes in response to initial injury
CRF- CS
edema, hypocalcemia, PTH activity, reduced RBC count
Ethylene glycol- tox type
Renal, CNS
Ethylene glycol- MOA
Metabolites made by alcohol dehydrogenase: glycolic acid- acidosis; glyoxylic acid- CNS; oxalate- binds Ca to cause renal damage via calcium oxalate
Ethylene glycol- stage 1
30 min-3 hours- ataxia, CNS depression, nausea/V, PUPD in dogs
Ethylene glycol- stage 2
12-24 hours- cardiopulmonary effects-tachypnea, tachycardia
Ethylene glycol- stage 3
12-72 hours (where most animals present) - PU leading to anuria, lethargy, anorexia, vomiting, seizures, oral ulcers, dehydration, enlarged kidneys
Ethylene glycol- dx
Concentration in blood (peak at 1-6 hours); gone from urine at 24 hours, cats below detectable; isosthenuria in 3 hours, crystalluria in 6. Hyperglycemia, hypocalcemia, anion gap, osmolal gap
Ethylene glycol- tx
Competitive inhibition of acohol dehydrogenase with 20% ethanol+sodium bicarb; 4MP or antizol
When is ethanol contraindicated in ethylene glucol
Renal failure
Eth glyc- charcoal?
Wont bind well
Cholicalciferol- tox type
kidney
Cholicalciferol- MOA
Increases Ca via all sources, choli–> 1,25 dehydrox
Cholicalciferol- organ effected most
Kidneys- then all others calcify
Cholicalciferol- Dx
Increased P then increased Ca, low PTH, azotemia, low USG, calciuria, multiple organ calcification
Cholicalciferol- tx
Saline/furosemide, prednisolone (blocks Ca absorb), calcitonin/pamidronate (SEs), sucralfate for ulcer, phos binder
Grape/raisin- tox type
kidney
Grape/raisin- CS
initial V then AKI
Grape/raisin- labs
hyper Ca, P, BUN
Grape/raisin- tx
Furosemide, fluids, Dopamine (renal blood flow), mannitol (osmoreg)
Acetaminophen- tox type
liver
Acetaminophen- species
Cats (gluc) pigs (sulf)
Acetaminophen- MOA
Formation of NAPQI which after glutathione gone binds to proteins to cause liver necrosis and methemoglobin
Acetaminophen- CS cats
Methemoglobin, paw/face edema
Acetaminophen- CS dogs.rats
hepatic necrosis
Acetaminophen- tx
NAC glutathione precursor, ascorbic acid for metHg, cimetidine/ranitidine for less abs
NSAID- tox type
Liver
NSAID- MOA
Uncouple ox phos - lactic acid, acidosis; cox enzyme GI ulceration, renal tox via prostaglandin inhibition
NSAID- CS acute
Depression, acidosis, nausea, V
NSAID- CS chronic
GI ulceration, metHgbemia, thrombocytopenia, anemia
Naproxen- tox type
liver
Naproxen- CS
Black tarry stool, weakness, pale gums, facial twitch in cats, ulcerative perforation
Naproxen- dx
Anion gap, liver enz, increased clotting, AKI, necrotic macrophages in liver
Naproxen- tx
Emesis, charcoal repeatedly, H2 blockers (ulcer), sucralfate with misoprostol for weeks, symptoms (anion, hyper K)
Arsenic- tox type
Liver
Arsenic- source
Well water
Arsenic- MOA
Penta- metabolized to toxin in rumen; Trivalent- binds to -SH groups to inhibit ox phos, reduce metabolism; GI tox to epithelium leading to shock/enteritis
Arsenic- CS hallmarks
GI, stagger, tremble, PU/PD to anuria, posterior paresis, coled extremeties, hypothermia
Arsenic- lesions
Brick red gut, yellow soft liver, red congested lungs, kidney damage, smell gi contents
Arsenic- tx
Chelation therapy with dimercaprol or sodium thiosulfate before CS
Zinc- tox type
kidney
Zinc- MOA
Zinc + stomach acid- free zinc- zinc salts - corrosion; oxidative damage leading to hemolysis
Zinc- CS acute
hemolytic anemia, jaundice, pancreatitis, neteritis, panc/kid/liv necrosis
Zinc- CS chronic
Cattle- hemolytic anemia, lameness, gastric ulcers, renal necrosis, hepatocye necrosis
Zinc- tx
PPI (omeprazole), H2 blockers to stop absorption, symptomatic
Dishwasher detergent MOA and tx
alkalinity 11, dilution, analgesics, steroids for inflammation
scour/bleach - MOA, CS, Tx
alkalinity, liquefactive necrosis of MM, dilute, cathartics after dilute
Disinfectants- types and MOA
phenol- protein denature; pine oil- MM irritation
Phenol- CS
Burns, shock, arrhythmias, MetHgbemia, liv/kid damage
Phenol tx
milk or eggs, decontam only if large amount or no burns; 1% methylene blue for MHGB
Pine oil CS
respiratory depression, bloody vomit, hpotension, pulmonary edema; cats sensitive
Pine oil tx
milk, egg whites, whater, no emesis/lavage; maintain osmotic balance
Toilet cleaner MOA
Acid or base
Toilet CS
dysphagia, dyspnea, ulcer,
Toilet tx
dilution, steroids for stricture NO DECONTAM
Ammonia- MOA, CS, tx
Alkaline, same as toilet
Zearelanone- tox type
Repro- phytoestrogen, beans
Zearelanone- source
Fusarium DON grains
Zearelanone- species
all but chicken
Zearelanone- hallmark
vulvovaginitis/hyperestrogen syndrome
Zearelanone- ferret/pig CS
all repro depending on sex and maturity
Zearelanone- cattle/sheep
regressed testis/feminization; abortin/pseudopreg
Zearelanone- tx
Remove feed; charcoal, high fber to reduce eliminationt ime?
Bees- tx
Epinephrine
Wasps- MOA
peptides, enzymes, amines for pain- ex. kinins
Fire ants- MOA
Alkaloids: piperidine- dermal necrosis
Ticks- MOA
Decreased Ach at NMJ- weakness
Ticks- CS
Loss of voice, ascending flaccid paralysis, respiratory death
Ticks tx
Abs, antiemetics, atropine
Bufo- MOA
biogenic amines- histamine and serotonin mimicks for vasoconstriction, hallucination; budotoxin- inhibit NaKATPase like glycosides for arrhythmias
Bufo- tx
charcoal, oral decontam, diaz for seizure, propranolol/lidocaine for arry; digoxin immuned Fab
Black widow MOA
alpha-latrotoxin pores in membranes to allow Ca influx to release nuerotrans for muscle spasms (sustained)
Black widow tx
Calcium gluconate for cramps, antivenom, resp support
Brown rec- MOA
sphingomyelinase D necrotizing enzyme - cleaves lipids in membrane = tissue necrosis
Brown rec CS
Hemolytic anemia, bulls eye ulcer
Brown rec tx
Abx, Burrow’s solution on wound, bicarb for hemoglobinuria
Coral MOA
Neurotoxin binds Ach- paralysis (irrev)
Coral CS
Tissue necrosis, myoglobinemia (cat), hemolysis (dog_
Copper tx
antihistamine
rattle/mocc tx
fluids, gluco (shock), cortico (inflamm)
Pit viper CS
Hypotension, shock, tachycardia/pnea, anticoagulation
Enterotoxin- MOA
bind intestinal epi, increase permeability
Endotoxin- MOA
Prvent Ach release at NMJ - paralysis