Unit 3 - Pharmaceuticals and Human Foods Flashcards
What were the top 2 pet toxins of 2019?
Over the counter medications and human prescription medications
What are the typical scenarios of OTC medication toxicosis?
Accidental ingestion, misuse, under the table dealings
What drug is tylenol?
Acetaminophen
What type of drug is tylenol?
analgesic and antipyretic
What is the most common source of tylenol posioning?
Purposeful use to treat the pet
T/F: There is no margin of safety with use of acetaminophen in cats, but there is a small one in dogs.
True
Where is acetaminophen absorbed? Metabolized? Secreted?
Absorbed in the GI tract
Metabolized in the liver
Secreted in the urine
What is the MOA of acetaminophen toxicosis?
- APAP metabolized to NAPQI: dogs conjugate & excrete, cats can’t conjugate
- Non-conjugated NAPQI binds to proteins & causes lipid peroxidation
- RBC lysis & hepatic necrosis
- Death
What enzyme do cats lack that don’t allow them to metabolize/excrete the toxic metabolite from acetaminophen metablolism (NAPQI)?
Glucuronosyltransferase
What clinical signs do cats exhibit with acetaminophen toxicosis?
Hematological effects - cyanosis (due to methemoglobinemia), hemolytic anemia, hematuria/ hemoglobinuria
**Metabolic (skin)** - **facial edema & swollen paws,** prurirtus Hepatic complications (high dose) - encephalopathy, coagulopathy
What clinical signs do dogs exhibit with acetaminophen toxicosis?
GI - anorexia, nausea, vomiting, diarrhea
Hepatic associated - hemolysis, icterus
Hematological effects (high dose) - methemoglobinemia
How is acetaminophen toxicosis diagnosed?
Serum - ↑ APAP, Clin path
Whole blood - Clin path
Liver - histopath
Kidney - histopath
History of exposure
What clin path results are consistent with acetaminophen toxicosis?
↑ALT, ↑ AST, ↑ Bilirubin
↓ PCV w/ Heinz bodies- cats
What lesions are associated with acetaminophen toxicosis?
Centrilobular to diffuse hepatic necrosis
+/- renal tubular necrosis
How is acetaminophen toxicosis treated?
Antidote
Decontamination - induce emesis as necessary, activated charcoal, +/- cathartic
Antioxidant administration
RBCs or oxyglobin
Blood transfusion
Methylene blue - last resort
What is the antidote for acetaminophen toxicosis?
N-Acetylcysteine (Mucomyst) - needs to be administered immediately
What drug is aspirin?
Acetylsalicylic acid
What does aspirin do?
NSAID and anti-pyretic - COX inhibitor
Analgesic properties - osteoarthritis
Antithrombotic
T/F: Aspirin can be used therapeutically in cats.
True
Is the half-life of aspirin longer in cats or dogs?
Cats
Where is aspirin absorbed? Metabolized? Excreted?
Aborbed rapidly in GI tract
Metabolized in the liver
Excreted in the urine in a conjugated form
What is the MOA of aspirin toxicosis?
- Aspirin metabolized to metabolites
- Salicylate inhibits COX → ↓ Prostacyclin, ↓ Thromboxane, uncoupling of oxidative phosphorylation
- GI & renal necrosis +/- bleeding
When is the onset of clinical signs for aspirin toxicosis?
1 hour to days
What clinical signs are associated with aspirin toxicosis?
Predominantly GI
complications - anorexia, vomiting (+/- blood), diarrhea, melena
Anuria
Muscle weakness
Respiratory depression
CNS depression - coma, death
How is aspirin toxicosis diagnosed (samples and their purpose)?
Whole blood - clin path
Serum - clin path, aspirin
Urine - aspirin
Histopath - liver, kidney, stomach, & intestines
What clin path results are consistent with aspirin toxicosis?
↑ Anion gap - metabolic acidosis
↑ ALT, ↑ AST, ↑ Bilirubin - hepatic damage
↓ PCV - secondary anemia, blood loss
↑PT/PTT - loss of clotting factors & platelets
Azotemia - renal dysfunction
What lesions does aspirin toxicosis cause?
Gastric ulceration and perforation - gastric bleeding
Hepatic and renal necrosis
How is aspirin toxicosis treated?
Decontamination - emesis (if indicated), activated charcoal, cathartics
Supportive care - IV fluids (Na bicarb), assisted ventilation as needed, blood transfusions, GI protectants
What drugs are Advil and Motrin?
Ibuprofen
What type of drug is ibuprofen?
Analgesic, anti-inflammatory, and antipyretic
What is the most common source of ibuprofen poisoning?
Purposeful use to treat a pet
T/F: The toxic dose of ibuprofen is 1/2 in dogs than that in cats.
False - other way around
Where is ibuprofen absorbed? Metabolized? Excreted?
Rapidly absorbed in GI tract
Metabolized in liver
Excreted in urine
What is the MOA of ibuprofen toxicosis?
- Metabolized in liver
- Enters enterohepatic circulation
- Inhibits COX
- ↓ Prostaglandin → ↓blood flow, ↓ Epithelial flow
- GI & renal necrosis
What organ systems are targeted with ibuprofen toxicosis?
Gastrointestinal
Renal
Neurologic
When is the onset of GI clinical signs caused by ibuprofen toxicosis ? What are they?
Onset: 1-2 hrs
Anorexia, nausea, vomiting, abdominal pain, diarrhea, melena
When is the onset of renal clinical signs caused by ibuprofen toxicosis? What are they?
Onset: 12 hrs - 5 days
Oliguria, anuria, painful renal palpation, uremic breath
When is the onset of neurologic clinical signs caused by ibuprofen toxicosis? What are they?
Onset: 1-2 hrs
Depression, stupor, ↓ PLR, respiratory depression, coma
How is ibuprofen toxicosis diagnosed (samples and purpose)?
Whole blood - CBC
Serum - chemistry, ibuprofen levels
Urine - UA, renal baseline values
Histopath - kidney, stomach, intestines
What clin path results are consistent with ibuprofen toxicosis?
↑ Anion gap - metabolic acidosis
↑ALT, ↑ AST, ↑Bilirubin - hepatic damage
↓ PCV - secondary anemia, blood loss
Azotemia - renal dysfunction
What lesions are associated with ibuprofen toxicosis?
GI - erosions, ulcerations, perforations, and mucosal edema
Renal necrosis - papillary, cortical, and coagulative with tubule dilation
How is ibuprofen toxicosis treated?
Decontamination - emesis, activated charcoal, cathartics
Supportive care - IV fluids (Na bicarb), assisted ventilation, blood transfusions
Gastro protectants - Misoprostol, Sucralfate, H2 blockers, PPIs
How often should renal values be monitored in patients with ibuprofen toxicosis?
They should be monitored every 24 hours for 3 days
What is the common cause of 5-fluorouracil toxicosis in pets?
Accidenta consumption (it is an antineoplastic used for skin tumors)
T/F: 5-fluorouracil is an extremely toxic compound. Cats are more susceptible than dogs.
True
Where is 5-fluorouracil absorbed? Distributed?
Rapid absorption - oral, dermal
Wide distribution
What is the MOA of 5-Fluorouracil?
Inhibits RNA function
Tissue with high metabolic turnover affected
When is the onset of clinical signs due to 5-Fluorouracil toxicosis?
Rapid
What clinical signs are associated with 5-Fluorouracil toxicosis?
GI - bloody vomit, bloody diarrhea (GI sloughing)
CNS (30-45 mins) - Depression, tremors, seizures
Bone marrow suppression: Anemia, ↓ Immune system fx
Death in 7 hrs
How is 5-fluorouracil toxicosis diagnosed?
History of exposure and clinical signs
How is 5-fluorouracil toxicosis treated?
Decontamination ASAP (gastric lavage)
Seizure control - Phenobarbital (addn’l Propofol or pentobarbital)
IV fluids - maintain perfusion & hydration, colloids & blood products
GI protectants - H2 blockers, omeprazole
Broad spectrum abx
Bone marrow stimulation - Neupogen
For how long post 5-fluorouracil toxicosis should pateints be closely monitored?
For 4 weeks
What TCAs are common antidepressents in toxicosis cases?
Amitriptyline (Elavil), Clomipramine, Desiparamine, Imipramine (Tofranil), and Nortriptyline
What SSRIs are common toxicants?
Bupropion, Fluoxetine (Prozac), Paroxetine, Sertraline (Zolof), Trazadone
What are the toxicokinetics for antidepressent toxicosis?
Rapid absorption
Protein bound
Metabolized in the liver
Wide volume of distribution
Excretion - bile (TCA) and urine (SSRi)
What is the MOA of TCA toxicosis?
5-HT Reuptake inhibited
NE Reuptake inhibited - hypotension
Muscarinic binding of Ach inhibited - anticholinergic effects
Histamine blocked - sedation
When is the onset of clinical signs for TCA toxicosis?
30 minutes
What clinical signs are associated with small TCA overdoses?
Mild sedation and anorexia
What clinical signs are associated with large overdoses of TCAs?
Histamine blockade - profound sedation
Alpha adrenergic blockade - Arrhythmias, tachycardia, CV collapse, hypotension
Anticholinergic effects - Mydriasis, dry mouth, tachycardia, urinary retention, ↓ GI motility
What is the leading cause of death due to TCA toxicosis?
Cardiovascular collapse
How is TCA toxicosis treated?
Decontamination - emesis, activated charcoal
EKG - monitor for widening QRS
IV fluids @ 1.5-2x maintenance
Control seizures - Diazepam/Benzo
Physostigmine (cholinesterase inhibitor)
What is the MOA of SSRIs?
5-HT reuptake inhibited
Increase of 5-HT in synapse
Development of serotonin syndrome
What clinical signs are associated with SSRI toxicosis?
CNS stimulation: excitation, tremors, seizures, hyperthermia
GI: vomiting, colic, diarrhea
What samples are collected for the diagnosis of SSRI toxicosis?
Blood - detection by GC/MS
What lesions are associated with SSRI toxicosis?
There are no lesions
How is SSRI toxicosis diagnosed?
Detection of compound
Clinical signs
History of exposure/consumption
How is SSRI toxicosis treated?
Decontamination - emesis, activated charcoal
Supportive care - Phenobarbital, cyproheptadine (5-HT antagonist), cool IV fluids, antiemetics
What is serotonin syndrome?
Drug induced syndrome due to elevated serotonin levels in the CNS
What are the contributing factors that may induce serotonin syndrome?
Decrease re-uptake of 5-HT
Increased synthesis
Decreased breakdown of 5-HT
5-HT agonists
When is the onset of clinical signs associated with serotonin syndrome?
30 minutes to 12 hours
What are the clinical signs of serotonin syndrome?
CNS - agitation, vocalization, confusion, seizures
GI - vomiting, abdominal pain, diarrhea, salivation
Neuromuscular - tremoring, ataxia
CV - tachycardia, hypertension
Hyperthermia
Blindness
What are the toxicokinetics of amphetamines?
Rapid GI absorption
Wide distribution (lipid soluble) - liver, lung, kidney, brain
Very little metabolism
Excreted in the urine (acidic increases excretion)
What is the MOA of amphetamines?
↑ Catecholamine release
↓ Reuptake - norepinephrine, serotonin, dopamine
When is the onset of clinical signs for amphetamine toxicosis?
Minutes to hours
What clinical signs are associated with amphetamine toxicosis?
Sympathomimetic - mydriasis
Cardiac stimulant - tachycardia, arrhythmias
CNS stimulant - hyperactivity, restlessness/ tremors, seizures, hyperthermia
What samples are used for the diagnosis of amphetamine toxicosis?
Urine and stomach contents
How is amphetamine toxicosis treated?
Decontaminate - emesis (w/in 15 minutes), activated charcoal
Supportive care:
Sedatives - phenobarbital, phenothiazine
IV fluids - tx hyperthermia, protect kidneys
Tachycardia - beta blockers
Tremors - methcarbamol
Acidify urine - ammonium chloride (↑ excretion)
What sedative should not be used for the treatment of amphetamines?
Diazepam
What are the toxicokinetics of cocaine?
Rapidly absorbed
Lipophilic - crosses BBB
Metabolized into metabolites….. (next question)
Excreted in the urine
What are the metabolites of cocaine?
Benzoylecgonine
Ecgonine methyl ester
What is the MOA of cocaine toxicosis?
Blocks Na channels - conductance disturbances
Increases catecholamine release - increases vasoconstriction
Increases calcium in cardiac tissue - increases cardiac contractility and thus O2 demand resulting in cardiac failure
When is the onset of clinical signs for cocaine?
minutes to hours
What clinical signs are associated with cocaine toxicosis?
Sympathomimetic - mydriasis
Powerful CNS stimulant - hyperesthesia, hyperactivity, erratic behavior, seizures
Cardiotoxic - tachycardia, arrhythmias, hypertension
How is cocaine toxicosis diagnosed (sample and purpose)?
For detection of parent compound & metabolites - urine, plasma, stomach contents
For histopath - heart & lung
History of exposure
What clin path abnormalities are consistent with cocaine toxicosis?
acidosis, hypoglycemia
What lesions does cocaine toxicosis cause?
Pulmonary and cardiac hemorrhage
Pericardial edema
How is cocaine toxicosis treated?
Decontamination - emesis & AC if possible
Control cardiac arrhythmias - beta blockers
Control seizures - Diazepam/ phenobarbitol
Respiratory support
Control hyperthermia
If necessary - careful removal of ingested bag
What is the toxin of concern in marijuana?
Tetrahydrocannabinol (THC)
What are the sources of THC?
Often mixed with chocolate
Baked goods
Plant material
Concentrated oils/products
CBD oil products
Synthetic cannabinoids (K2)
Why do we have to be extra careful with CBD products?
Because concentrations can vary despite what the label says
How is THC absorbed? Metabolized? Distributed? Excreted?
Rapid absorption - oral and inhalation
Metabolized in the liver
Distributed to brain and fat (lipophilic)
Excreted in bile
What is the MOA of THC?
Acts on CBD receptors in the body
GABA release inhibited - dopamine secretion is uninhibited, euphoria
Norepinephrine & serotonin release also affected
How is THC toxicosis diagnosed (samples and use)?
Gold standard- GC/MS or LC/MS
serum, urine, stomach contents, liver, kidney
How is presence of CBD diagnosed?
CBD - GC flame ionization with source product
T/F: The OTC human urine test is adequate for detection of THC in animals.
False - It can give false negatives
When is the onset of clinical signs for THC/CBD/Cannabinoid toxicosis?
Minutes to hours
What clinical signs are associated with THC toxicosis?
CNS depressant
Vomiting
Euphoria → Depression → Coma
Mydriasis
Urinary incontinence
What clinical signs are associated with CBD toxicosis?
Variable C/S
Asymptomatic
Vomiting
Depression - lethargy, ataxia
Agitated
What clinical signs are associated with synthetic cannabinoid toxicosis?
Severe effects:
CNS stimulation
seizures/ convulsions
Ataxia
Vomiting
How is THC/CBD/Synthetic cannabinoid toxicosis treated?
Slow recovery - clinical effects may last for days
Decontamination - emesis, activated charcoal
Supportive - respiratory support & stimulation
Agitation & seizure control - butorphanol, diazepam, barbiturates
What drug can be used to stimulate and provide respiratory support in patients with THC/CBD/Synthetic cannabinoid toxicosis?
Doxapram
What are the opiods of concern for toxicosis?
Morphine, oxycodone, codeine, hydromorphone, fentanyl
Heroin, abused medications
Opiod expsure is often due to what?
Accidental ingestion or inhalation (police dogs)
Where are opiods absorbed? Distributed? Metabolized? Excreted?
Rapid absorption
Wide distribution (lipophilic) - crosses BBB
Metabolized in the liver
Excreted in the urine
What opiods are full agonists?
morphine, codeine, heroin, fentanyl, meperidine
What opiods are agonists/antagonists?
Butorphanol, Nalorphine
What opiods are partial agonists?
Tramadol, buprenorphine
What clinical signs are associated with opioid toxicosis in dogs?
Excitation early
Progression to depression/ stupor, respiratory depression, hypotension, coma,
Death w/in 12 hrs,
Miosis, vomiting, diarrhea, salivation, constipation
What clinical signs are associated with opioid toxicosis in cats and horses?
Excitation
Aggression
Seizures
Mydriasis
How are opioids detected?
In serum or urine
What is the antidote for opioids?
Naloxone (Narcan)
How is opioid toxicosis treated?
Naloxone
Decontamination - emesis, activated charcoal, fluids
Diazepam if seizing
Supportive care - artificial respiration
What can be used in place of naloxone if it is not available?
Butorphanol - it is only a partial antagonist so it will not work as well
What are the sources of ethanol for toxicosis cases?
Alcoholic beverages - wine, beer, liquor
Fermented foods - grains, fruits, bread dough
Commercial cleaning products - isopropyl alcohol
Fuel
What are the toxicokinetics of ethanol toxicosis?
Rapid absorption - absorption slowed by food
Wide distribution
What is the MOA of ethanol toxicosis?
Acts as an anesthetic agent by reversibly binding action potentials of neurons
What clinical signs are associated with ethanol toxicosis?
Onset: W/in 1 hour
Behavioral changes -excitability, vocalizing, incontinence
Ataxia & incoordination
Vomiting
Drowsiness/ depression
Unconsciousness - loss of reflexes
Respiratory & cardiac depression
Coma
Death
How is ethanol toxicosis diagnosed?
History of exposure/consumption, clinical signs, high BAC
How is ethanol toxicosis treated?
Early decontamination - emetics (<15 min), gastric lavage, activated charcoal
Supportive care:
Respiratory support -maintain ventilation, respiratory stimulants, O2
Monitor & control acid/base balance (fluids w/ bicarbonate)
Yohimbine
What are the sources of xylitol?
Chewing gum, mints, sweeteners, and various foods
What are the toxicokinetics of xylitol?
Rapidly absorbed
Metabolized in liver
What is the MOA of xylitol?
Stimulates pancreatic secretion of insulin
Unkown cause of hepatic necrosis
What clinical signs are associated with xylitol toxicosis?
Vomiting
Hypoglycemia (10-60 mins) - weakness, depression, collapse, ataxia, tremoring/seizures
Secondary to hepatic necrosis (9-12 hrs) - DIC, icterus, hemorrhage, melena, diarrhea
Neurologic signs
How is xylitol toxicosis diagnosed?
Blood glucose
Serum chemistry
Post mortem
What blood glucose result is consistent with xylitol toxicosis?
Hypoglycemia
What serum chemistry results are consistent with xylitol toxicosis?
Elevated hepatic enzymes - ALT, ALP, AST
Hyperbilirubinemia
Electrolyte abnormalities - hyper/hypophosphatemia, hypercalcemia
What post mortem lesions are consistent with xylitol toxicosis?
Hepatic necrosis
Widespread icterus and hemorrhage
How is xylitol toxicosis treated?
Decontamination - emesis & activated charcoal
IV crystalloid fluids - recommended even if initial BG is normal
Supportive hepatic care