Injectable Anesthetics Flashcards
Thiopental (Penthal) drug class
barbiturate injectable anesthetics
Thiopental MOA
GABA-A agonist
Thiopental Therapeutic Use
anesthesia
preferred for patients with CNS diseases
Can thiopental be mixed with other drugs?
can be mized with propofol for synergistic effect
Thiopental Adverse Effects
not reccommended for greyhounds
requires prior sedation in horses to prevent excitement and incoordination
swine: prolonged recoveries
Thiopental Duration of Action
ultrashort 20 min
Phenobarbitol drug class
barbiturate injectable anesthetic
Phenobarbital MOA
GABA-A agonist
Phenobarbital Therapeutic Use
anticonvulsant for long term seizure control
treat strychnine poisoning/tetanus
Phenobarbital duration of action
long acting 12 hours
Methahexital drug class
barbiturate injectable anesthetic
Methohexital MOA
GABA-A agonist
Methohexital duration of action
ultrashort 10-15 min
Methohexital Therapeutic Use
anesthesia
Methohexital Adverse Effects
not for seziure patients
Methohexital Benefits
greyhounds recover faster
Pentobarbital (Nembutal) drug class
barbiturate injectable anesthetics
Pentobarbital MOA
GABA-A agonist
Pentobarbital duration of action
short acting 1-2 hours
Pentobarbital Therapeutic Uses
anesthesia - good for rodents
euthanasia
anticonvulsant
Pentobarbital metabolism
extensive hepatic metabolism
cooking does not inacticate meat of euthanized animals
Propfol MOA
GABA-A agonist
Propofol Therapeutic Uses
anesthesia
anticonvulsant
Propofol Benefits
good for patients with CNS disease
best for dogs with severe liver disease
Propofol Adverse Effects
delayed recovery in cats
pain on injection
wound infection
propofol syndrome
heinz-body formation in cats, followed by anorexia and diarrhea
Does propofol provide analgesia?
NO
What are the specific effects of Propofol in greyhounds and geriatric dogs?
prolonged effects
Etomidate MOA
GABA-A agonist
Etomidate therapeutic use
induction of anesthesia in animals with cardiovascular disease
Etomidate adverse effects
myoclonus - attenuate w BZ or opioid
RBC hemolyisis
supression of adrenal function
Does Etomidate provide analgesia?
NO analgesia
Can Etomidate be used for maintenance of anesthesia?
NO but effects last for 6 hours
Alfaxalone MOA
GABA-A agonist
Alfaxlone Therapeutic Use
induction and maintenance of anesthesia
Benefits of anfaxlone in greyhounds?
alternative to propfol
How is alfazalone used in horses?
induction agent combined with ace, xylazine and guaifenesin
Alfaxalone Adverse Effects
respiratory depression
poor induction and recovery if used alone
CVS depression
Does alfaxalone provide analgesia?
NO
Ketamine drug class
dissociative anesthetic
Ketamine MOA
NMDA anatgonist
multimodal effects
Ketamine Therapeutic Use
induction agent used in large, small and exotic animals
maintenance adjunct
analgesia
Benefits of Ketamine
bronchodilation - good choice for asthamtics/COPD
Ketamine Adverse Effects
emergence delirium
cough and laryngospasm
pain on IM inj
Ketamine Precautions
caution in patients with cardiovascular disease
not for patients with elevated intraocular or intracranial pressure
Is ketamine metabolized to an active metabolite? If so, what is it called?
yes, norketamine
Tiletamine drug class
dissociative injectable anesthetic
Tiletamine MOA
NMDA anatgonist
Tiletamine Onset of Action
rapid onset
Tiletamine Therapeutic Use
induction and maintenace of anesthesia
Common combination with tiletamine?
zolazepam
(telazol)
Species sentivity to tiletamine compared to zolazepam
cats and pigs: zolazepam > tiletamine
dogs and horses:
tiletamine > zolazepam
Concerns/Controversies with Tiletamine
tigers: slow ataxic recoveries, neurological dysfunction, death
white rabbits: lethal renal tubular necrosis (New Zealand)
Precautions when using Tiletamine
never use as the sole agent in horses