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