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surgery & anesthesia
injectable anesthetics
Question | Answer |
---|---|
what are the 3 type of injectable anesthetics? | Barbiturates, propofol, and etomidate |
injectable anesthetics don't do what? | Don’t provide analgesia or muscle relaxation |
can injectable anesthetics be used with other agents? | YES. |
Barbiturates are a derivative of __________. | barbituric acid |
Barbiturates are controlled or non-controlled? | CONTROLED. |
What are the subclasses of barbiturates based on duration? | ultra-short, short, intermediate, & long-acting |
3 ultra-short barbiturates: | Thiopental sodium, methohexital, and thiamylal |
what species is ultra-short barbiturates used on? | cats, dogs, & horses |
what do ultra-short barbiturates do? | induce general anesthesia |
a short acting barbiturate: | Pentobarbital |
what is a benefit of pentobarbital? | can treat epilepsy |
short acting barbiturates do what? | induce general anesthesia |
an intermediate barbiturate: | Secanol, treats tetanus & epilespy |
a long acting barbiturate is: | phenobarbital |
the 2 subclasses based on chemical structure: | OXYBARBITURATES (Phenobarbital, pentobarbital, & methohexital) & THIOBARBITURATES (Thiopental and thiamylal) |
Action of barbiturates: | Mimics the inhibitory neurotransmitter GABA --> Depresses nerve impulses to cerebral cortex --> CNS depression --> loss of consciousness |
Ionization: | Is in both polar (ionized) & nonpolar (nonionized) forms |
Nonpolar (nonionized) forms can: | pass through the cell membrane |
Increased nonpolarization, increased drug amounts to brain, exaggerated patient response, lower dose to anesthetize an animal are an indication of what? | Acidosis (blood pH <7.4) |
c/s of metabolic acidosis: | diarrhea, ketosis, severe infection, admin. Of acidic drugs (cholorphenicol & aminoglycosides) , shock! Increased resp. |
c/s of metabolic alkalosis: | vomiting, corticosteroid overdose, decreased resp. |
Resp. Acidosis = | hypoventilation |
Retention CO2 = | hypercapnia |