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RUSVM Toxicology > Toxicology Exam II Material > Flashcards

Toxicology Exam II Material Flashcards

1
Q

What species is most susceptible to urea toxicosis?

A

Ruminants

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2
Q

What domestic species is most sensitive to ethylene glycol toxicity?

A

Cats

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2
Q

When is chelation therapy indicated in the case of iron toxicity?

A

Only in severe toxicosis within 12 hours of ingestion

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2
Q

Glycerol monoacetate (Monacetin) is an antidote for:

A

fluoroacetate

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3
Q

Which of the following chelators is most commonly used to treat acute zinc toxicosis?

  • Succimer
  • EDTA
  • D-Penacillamine
  • None of the above
A

none of the above

In canines, zinc levels fall very quickly after the source is removed. Chelation therapy is not typically used in the case of zinc toxicosis

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4
Q

T/F: Ionophore toxicity is associated with ↑ CPK, ↑ AST, ↑ LDH, and ↑ ALP

A

True

  • Ionophore toxicity is associated with ↑ creatine phosphokinase (CPK), ↑ Aspartate transaminase (AST), ↑ Lactic dehydrogenase (LDH), and ↑ Alkaline phosphatase (ALP)*
  • It is also associated with ↑ PCV*
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4
Q

Ingestion of a plant that has been sprayed with a 2,4-D herbicide may cause poisoning in livestock mainly because of accumulation of toxic levels of what toxicants?

A

Nitrate or cyanide

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4
Q

What is the treatment protocol for urea toxicosis in cattle?

A

Acetic acid or vinegar

Followed by a large volume of cold water. Normal saline for dehydration, and sodium bicarbonate IV for acidosis.

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5
Q

What is the mechanism of action (MOA) of pentachlorophenol (PCP) toxicosis?

A

Uncouples oxidative phosphorylation and blocks or decreases ATP

This leads to an increased oxygen demand in an effort to produce ATP. The oxygen demand is more than the oxygen supply, resulting in overheating, metabolic acidosis, and dehydration

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5
Q

T/F: Reduced cytochrome oxidase in cattle can be used as a diagnostic test in molybdenum toxicosis

A

True

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5
Q

What species is most susceptible to molybdenum toxicosis?

A

cattle

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5
Q

What species is the most sensitive to phenoxy derivatives of fatty acids (2,4-D herbicides)?

A

dogs

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5
Q

Describe the characteristic lesions associated with urea toxicosis

A

None

There are no characteristic lesions associated with urea toxicosis. However, dead animals are usually very bloated. The pH of the rumen would likely be very alkalotic. There may also be an ammonia odor

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6
Q

What chelator is typically used to treat copper toxicosis?

A

D-Penacillamine

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7
Q

Which of the following body systems is least likely to show clinical signs in chronic lead toxicosis?

  • Renal systen
  • Neurological system
  • GI system
  • Hematopoietic system
A

Renal system

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8
Q

In what breed do we typically observe chronic copper toxicosis?

A

Bedlington Terriers

This is due to an autosomal recessive disorder at 2-6 years of age

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8
Q

T/F: Hematologic signs including hemolytic anemia, icterus, and hemoglobinuria are commonly associated with zinc toxicosis

A

True

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9
Q

What are the preferred specimens for chemical detection of strychnine in a live animal?

A

stomach contents, bait, serum, urine

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9
Q

Serum and CSF (or ocular fluid) sodium concentrations above _______ mEq/L support diagnosis of water deprivation-sodium ion toxicosis

A

Serum and CSF (or ocular fluid) sodium concentrations above 160 mEg/L support diagnosis of water deprivation-sodium ion toxicosis

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10
Q

In what stage of acute iron toxicity do we expect to see the most serious clinical cardiovascular and metabolic effects?

A

Stage 3 (12-96 hours PI)

Vomiting, diarrhea, GI hemorrhage, metabolic acidosis, coagulation disorders, hepatic failure, cardiovascular collapse

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11
Q

T/F: Activated charcoal is highly effective for treatment of iron toxicity

A

False

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12
Q

Do younger patients have less or greater oral absorption of lead?

A

Greater

Younger patients have greater oral absorption of lead than adult patients. Younger patients are also more sensitive to lead toxicity because of their immature BBB.

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14
Q

T/F: Anorexia is a common clinical sign associated with arsanilic acid toxicosis in swine

A

False

Anorexia IS a clinical sign associated with arsanilic acid toxicosis in poultry

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14
Q

T/F: Onset of clinical signs of paraquat toxicity typically occur very rapidly

A

False

Signs may not be observed until 3 days after exposure to paraquat

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15
Q

Serum iron values above _______ mcg/dL are consistent with iron toxicity

A

> 300 mcg/dL

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16
Q

T/F: Cats that recover the acute phase of metaldehyde toxicosis develop liver failure within 2-3 days of exposure

A

False

DOGS that recover the acute phase of metaldehyde toxicosis develop liver failure within 2-3 days of exposure.

This has not been reported in cats

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17
Q

T/F: Enlarged yellow liver, enlarged friable and hemorrhagic kidneys, enlarged black spleen, and red wine-colored urine are lesions most likely associated with acute copper toxicosis

A

False

Enlarged yellow liver, enlarged friable and hemorrhagic kidneys, enlarged black spleen, and red wine-colored urine are lesions most likely associated with chronic copper toxicosis

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18
Q

T/F: Clinical signs of subacute selenium toxicosis in pigs are generally similar to toxicosis with arsanilic acid

A

True

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19
Q

What clinical signs predominate in the dog in the case of fluoroacetate (Compound 1080) toxicosis?

A

CNS stimulation and GI signs

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20
Q

T/F: Metaldehyde toxicity is associated with metabolic alkalosis

A

False

Metaldehyde toxicity causes metabolic acidosis

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20
Q

The most likely pathognomonic evidence of water deprivation/sodium ion toxicosis in swine is:

A

eosinophilic meningoencephalitis

This is only present in pigs and is only present during the first 24 hours!

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22
Q

What species is most sensitive to strychnine toxicity?

A

Horses, Cattle, Pigs

The toxic dose for these species is ~0.5 mg/kg. However, it is important to remember that while dogs are less sensitive (Toxic dose = 0.5 - 1.2 mg/kg), dogs are most frequently poisoned.

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24
Q

T/F: Methylene blue IV is the antidotal treatment for 2,4-D

A

False

Methylene blue IV is the antidotal treatment for nitrates

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24
Q

For treatment of seizures associated with metaldehyde toxicity, why is phenobarbital recommended after initial control with diazepam?

A

enzyme induction

Phenobarbital is an enzyme inducer, so it may also accelerate elimination of the toxin

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25
Q

What rodenticide has a characteristic acetylene odor?

A

Zinc Phosphide

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27
Q

What organic arsenical is mainly used as a feed additive in poultry?

A

Roxarsone

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28
Q

What signs are typically associated with acute paraquat toxicosis?

A

vomiting, anorexia, CNS depression

High doses may cause ataxia, dyspnea, and seizures. Signs may not be observed until 3 days after exposure

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28
Q

A dog presents to your clinic with compulsive hypermotility, abdominal pain, and vomits (the vomit smells like dead fish). Which of the following would you include in your treatment?

  • Antacids
  • Activated charcoal
  • Ammonium chloride
  • Methionone IV
A

antacids, activated charcoal

  • If the GI contents smell like dead fish, you’re likely dealing with Zinc Phosphide toxicity. Antacids are administered because acid enhances toxicity (leads to hydrolysis to phosphine gas - occurs at pH 4 and lower).*
  • The efficacy of activated charcoal isn’t super well documented but what the hell; why not*
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29
Q

T/F: The diagnosis of lead toxicosis in dogs is best established on the basis of the occurrence of basophilic stippling of erythrocytes

A

False

Basophilic stippling may occur on erythrocytes in dogs and rabbits associated with lead toxicity, but the best diagnostic sign is presence of lead in the blood

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30
Q

Approximately how long does strychnine persist in the environment?

A

Up to ~40 days

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31
Q

What species is most sensitive to monensin toxicosis?

A

Horses

Ionophores are rapidly metabolized by P-450 oxidative demethylation enzymes in the liver and excreted mainly in bile. Horses have the lowest levels of oxidative demethylases out of the other domestic species, so the compound is metabolized slowly

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33
Q

T/F: Arsanilic acid may produce peripheral and optic nerve degeneration

A

True

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34
Q

Which is more toxic: pentavalent arsenic or trivalent arsenic?

A

Trivalent arsenic

  • Inorganic trivalent is more toxic than pentavalent, which is more toxic than organic*
  • Trivalent > Pentavalent > Organic*
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34
Q

In what organs do we observe the most rapid accumulation and turnover of zinc?

A

pancreas, liver, kidney, spleen, male reproductive organs

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35
Q

T/F: Blindness may develop with arsanilic acid as well as with roxarsone

A

False

Blindness may develop with arsanilic acid but not with roxarsone

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35
Q

A feedlot steer that survived an overdose of monensin in the feed was found dead 3 weeks later.

T/F: The most likely cause of death, if related to the monensin toxicosis is persistent depolarization and arrhythmias as a result of the sodium and calcium channel effects

A

False

The most likely cause of death in this case, if related to the monensin toxicosis is cardiac fibrosis and insufficiency as a result of cardiac muscle necrosis during acute monensin toxicosis

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36
Q

What sample do you think is most appropriate for antemortem testing for lead toxicosis?

  • Serum
  • Plasma
  • Whole Blood
  • Brain tissue
A

Whole Blood

  • > 90% of circulating lead is bound to erythrocyte membranes*
  • Blood lead more than 0.4 ppm along with clinical signs is considered diagnostic (Blood lead >0.6 ppm are considered diagnostic regardless of correlation with clinical signs)*
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37
Q

The specimen of choice for analysis of nitrate poisoning in an animal that has been dead for several hours is:

A

ocular fluid

38
Q

Brain sodium concentrations above _______ ppm support diagnosis of water deprivation-sodium ion toxicosis

A

Brain sodium concentrations above 2200 ppm support diagnosis of water deprivation-sodium ion toxicosis

39
Q

Disruption of the citric acid cycle by inhibition of the aconitase enzyme is the mechanism of action for what toxicant?

A

Fluoroacetate

40
Q

What is the most efficient chelator for binding lead?

A

Calcium disodium EDTA

  • It is diluted and given in multiple doses IV (Used IM or SQ in large animals - painful!). Treat for a maximum of 5 days (renal injury is primary concern)*
  • Make sure to remove and lead from the gut before chelation, as chelation may enhance absorption further*
  • Or mayonnaise?*
40
Q

Fomepizole (4-methyl pyrazole) is not recommended for treatment of ethylene glycol poisoning in cats because it causes methemoglobinemia and Heinz body anemia

A

False

It does not do those things

42
Q

What is the mechanism of action for strychnine?

A

Blocks the post-synaptic effect of glycine in the spinal cord

  • Glycine is an important inhibitory neurotransmitter to motor neurons and interneurons in the spinal cord/brainstem/thalamus*
  • This leads to highly exaggerated reflex arcs, muscle spasms, severe extensor rigidity, and tonic seizures*
43
Q

Washing samples for laboratory diagnosis is generally contraindicated, however in __________ toxicosis it is recommended

A

selenium toxicosis

Specimens in chronic toxicosis are hair and hoof and must be washed before analysis

45
Q

T/F: You’re more likely to see reticulocytosis associated with zinc toxicity than with lead toxicity

A

True

46
Q

T/F: Toxicity of paraquat is enhanced by selenium-vitamin E deficiency, depletion of tissue glutathione, and oxygen therapy

A

True

47
Q

T/F: Seizures associated with strychnine toxicosis and water deprivation/sodium ion toxicosis are elicited by external stimuli

A

False

  • Seizures associated with strychnine toxicosis are elicited by external stimuli.*
  • Seizures associated with water deprivation/sodium ion toxicosis are not elicited by external stimuli!!*
48
Q

What is the common name for the poisonous plant Senna occidentalis?

A

Coffee Senna

50
Q

T/F: Cats are more sensitive to metaldehyde toxicosis than dogs

A

True

Cats are more sensitive than dogs, but dogs are more likely to ingest

51
Q

T/F: Oxygen therapy is used in severe cases of paraquat toxicity

A

False

Oxygen is contraindicated because it may increase lung damage

53
Q

T/F: Arsenic increases biliary excretion of selenium

A

True

54
Q

A patient with suspected toxin exposure presents to your clinic and vomits. The vomitus has a fishy/garlic/acetylene odor to it. You open the windows and ventilate the room immediately because you suspect this is what toxin?

A

Zinc phosphide

55
Q

Toxicity of urea is due to:

A

ammonia

Ammonia inhibits citric acid cycle resulting in lack of energy and decreased cellular respiration and tissue damage

56
Q

T/F: Urea toxicosis is associated with ↑ ammonia, ↑ blood urea nitrogen (BUN), ↑ blood glucose, ↑ blood lactate, ↑ blood pH, ↑ transaminases (ALT, AST), and ↑ PCV

A

False

Urea toxicosis is associated with ↑ ammonia, ↑ blood urea nitrogen (BUN), ↑ blood glucose, ↑ blood lactate, ↑ transaminases (ALT, AST), and ↑ PCV

Urea toxicosis is NOT associated with ↑ blood pH. Blood pH will decrease due to the circulating acids.

Rumen pH is expected to increase (>7.5 is highly suggestive of urea toxicosis)

57
Q

What is the mechanism of action of ionophore toxicosis?

A

Disruption of transmembrane electrochemical gradients

The main targets are the mitochondria of highly energetic tissues (myocardium, skeletal muscles, and the kidney)

58
Q

T/F: The clinical signs associated with water deprivation/sodium ion toxicosis in swine are thought to be mainly caused by cerebral edema and overhydration of nerve cells

A

True

59
Q

What is the drug of choice for treatment of mycoplasmosis in large animals?

A

Tetracycline

If Tetracycline does not work, Tiamulin is a good alternative in large animals.

60
Q

T/F: Ketamine may be used for treatment of strychnine toxicity

A

False

In general, you want to avoid dissociative anesthetics in the case of strychnine toxicity

61
Q

What is the principle behind chelation therapy?

A

The chelator binds a metal and forms a complex that is excreted

63
Q

What is the primary transport protein for iron?

A

transferrin

65
Q

When would you expect to observe respiratory signs associated with paraquat toxicity?

A

2-7 days

Respiratory signs include tachypnea, dyspnea, harsh respiratory sounds, cyanosis, and reduced pulmonary compliance

67
Q

What abnormal coloration of the urine may be considered normal in a patient that is undergoing chelation therapy with Deferoxamine?

A

reddish-brown

68
Q

What is the most toxic form of selenium?

A

Organic selenium in plants

Whereas synthetic organoselenium compounds are the least toxic

70
Q

What species is most frequently affected by marijuana toxicosis?

A

Dogs

Cats are also susceptible

71
Q

T/F: Repeated exposure to small amounts of strychnine over time is more toxic than a large single exposure

A

False

Most of the toxin is eliminated within ~24 hours and it does not accumulate in any particular tissue

72
Q

What is the chelating agent of choice for inorganic arsenic?

A

Dimercaprol (BAL)

73
Q

T/F: Fomepizole (4-methyl pyrazole) is used in the treatment of ethylene glycol in dogs and cats and acts by competitive inhibition of alcohol dehydrogenase

A

True

Alcohol dehydrogenase is the enzyme that catalyzes the initial steps in the metabolism of ethylene glycol and methanol to their toxic metabolites

75
Q

What is the mechanism of action (MOA) of trivalent arsenic?

A

Binds to 2-SH groups of lipoic acid

This binding results in inhibition of glycolysis and the citric acid cycle

76
Q

What toxicant is most likely to cause degeneration & pale areas in the myocardium and skeletal muscles, as well as damage in liver & kidney in most species?

A

Monensin

77
Q

What signs should you expect to see in Stage I acute iron toxicosis?

A

Nausea, vomiting, diarrhea, GI hemorrhage

79
Q

Which of the following metal toxicoses causes inhibition of the activity of several enzymes in heme synthesis?

  • iron
  • zinc
  • inorganic arsenic
  • lead
A

lead

80
Q

What are the preferred specimens for post-mortem chemical detection of strychnine?

A

stomach contents, liver

81
Q

What species is most susceptible to cocaine toxicosis?

A

Dogs

Especially police dogs

82
Q

T/F: Sucralfate may be used in the treatment of iron toxicity

A

True

Sucralfate is a GI protectant

83
Q

Methylene blue IV is the antidotal treatment for

A

Nitrate

84
Q

T/F: In chronic organic arsenical (Arsanilic Acid) toxicosis in swine, there is gradual onset of blindness and partial paralysis, but pigs still eat and drink

A

True

85
Q

How quickly would you expect to observe clinical signs associated with urea toxicosis?

A

0.5 - 3 hours (rapid onset)

Signs include restlessness, aggression, muscle tremors, salivation, teeth grinding, colic, bloat, rumen stasis, sternal recumbency while standing on the hind limbs, usually no diarrhea, convulsions and death within 1-2 hours

86
Q

Animals less than one year old are more sensitive to nonprotein nitrogen (NPN) toxicosis, but animals of what age are more tolerant?

A

Animals less than one year old are more sensitive to nonprotein nitrogen (NPN) toxicosis, but very young animals (3-6 weeks) are more tolerant

87
Q

Generally animals can tolerate more than _____% salt in feed as long as they have free access to water

A

Generally animals can tolerate more than 10% salt in feed as long as they have free access to water

88
Q

T/F: With regard to the toxicokinetics of monensin, ruminants absorb ~50% of the toxin, whereas horses/monogastrics absorb ~100%

A

True

89
Q

T/F: Ionophore toxicity is associated with ↑ serum Ca2+ and K+

A

False

Ionophore toxicity is associated with ↓ serum Ca2+ and K+

90
Q

Chronic diarrhea, depigmentation, emaciation, and lameness in cattle suggests toxicosis with:

  • inorganic arsenic
  • lead
  • molybdenum
  • copper
  • zinc
A

molybdenum

91
Q

Signs manifested in propylene glycol toxicity are due to the accumulation of __________ acid, resulting in metabolic acidosis

A

D-Lactic Acid

L-lactic acid is used by the TCA cycle. D-lactic acid is not readily used and accumulates. High concentrations of D-lactic acid may cause lactic acidosis

93
Q

What toxicant is associated with elevated citrate levels in the blood and kidneys?

A

Fluoroacetate

94
Q

What clinical signs predominate in the horse in the case of fluoroacetate (Compound 1080) toxicosis?

A

cardiac signs

95
Q

The most common source of lead toxicosis in animals is:

A

lead-based paints

A thumbnail sized chip of lead-based paint may contain 50-200 mg of lead. WOAH.

96
Q

What species is most sensitive to fluroacetate toxicity?

A

Dogs

  • Dogs: LD50 = 0.06 - 0.2 mg/kg*
  • Cats: LD50 = 0.5 mg/kg*
  • Livestock: LD50 = 0.15-0.7 mg/kg*
  • Rodents: LD50 = 5-8 mg/kg*
97
Q

What clinical signs predominate in cats and pigs in the case of fluoroacetate (Compound 1080) toxicosis?

A

CNS and cardiac signs

99
Q

The presence of an odor of rotten garlic in a fresh carcass is suggestive of acute __________ toxicosis

A

selenium

100
Q

T/F: Fomepizole is used in the treatment of both ethylene glycol and propylene glycol

A

False

Fomepizole is only used in the treatment of ethylene glycol

101
Q

Identify this selenium indicator plant that is grown widely in the west:

A

Prince’s Plume

Stanleya pinnata

102
Q

T/F: Phenothiazines may be used for treatment of strychnine toxicity

A

False

In general, you want to avoid opioids, phenothiazines, neuromuscular blockers, and dissociative anesthetics in treatment of strychnine toxicity

103
Q

T/F: Tonic-clonic convulsive seizures and opisthotonos are the most predominant signs associated with Fluoroacetate (Compound 1080) toxicity in the horse

A

False

Cardiac signs predominate in the horse. Signs of heart failure, staggering, and arrhythmias may be seen as well as colic and terminal convulsions (from cerebral anoxia). Death may be due to arrhythmias or respiratory failure/anoxia

104
Q

Deferoxamine is the chelating agent of choice for:

A

iron

105
Q

Acute zinc phosphide toxicity is mostly due to:

A

phosphine gas

When zinc phosphide is exposed to acid, phosphine gas (PH3) is released. The gas is toxic, flammable, and is an irritant.

106
Q

Other than freezing, what compound may be used to preserve the rumen for laboratory diagnosis in the case of suspected urea toxicosis?

A

Mercury chloride

107
Q

T/F: Diets low in energy and protein but high in fiber will increase urea toxicity

A

True

108
Q

Which of the following heavy metals require special royal-blue top tube for accurate measurement?

  • Iron
  • Zinc
  • Lead
  • Inorganic Arsenic
A

Zinc

109
Q

What organic arsenical is mainly used as a feed additive in swine?

A

Arsanilic acid

110
Q

T/F: Chronic selenium exposure results in high concentrations in the hair and hooves

A

True

111
Q

A dog that is showing autonomic signs including vomiting, colic, diarrhea, mydriasis, dyspnea; nervous signs including convulsions; locomotor signs including ataxia; then recovers to show signs of liver failure and metabolic acidosis 2-3 days later is most likely intoxicated with:

A

Metaldehyde

112
Q

A dog showing gastrointestinal signs followed by a phase of apparent recovery, which deteriorates into multi-organ failure is most likely poisoned with oral

A

iron

113
Q

Sternal recumbency while standing on the hind limbs is a clinical sign of what food and water related toxicant?

A

NPN (Urea)

Signs include restlessness, aggression, muscle tremors, salivation, teeth grinding, colic, bloat, rumen stasis, sternal recumbency while standing on the hind limbs, usually no diarrhea, convulsions and death within 1-2 hours

114
Q

T/F: If your favorite pig is pivoting on one foot, that behavior is pathognomonic for water deprivation-sodium ion toxicity

A

False

Pivoting on one foot is considered characteristic, but NOT pathognomonic

115
Q

When would you expect to see late signs associated with ethylene glycol toxicity in the cat?

A

12-24 hours post-ingestion

116
Q

When would you expect to see late signs associated with ethylene glycol toxicity in the dog?

A

24-72 hours post-ingestion

117
Q

What drug is considered the “most nephrotoxic drug ever”?

A

Amphotericin B

  • “But that’s not important”*
  • Yes it is. Use of this drug is a differential diagnosis for ethylene glycol toxicosis.*
118
Q

T/F: Ethylene glycol is known to cause heinz body anemia in cats

A

False!

Propylene glycol is known to cause heinz body anemia in cats

….dummy

RUSVM Toxicology (6 decks)

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