Inhalant Anesthesia Flashcards
4 main vapor inhalants we talk about
halothane, isoflurane, sevoflurane, desflurane
The number of molecules of an anesthetic must be equal in each phase to achieve equilibrium.
False! Equilibrium is reached when partial pressure of the anesthetic is the same phase, but the number of molecules is not equal
Solubility is expressed as a _____.
partition coefficient
T/F: the anesthetic in the alveolar gas represents the brain concentration
True!
What does the blood-gas partition coefficient describe?
amount of anesthetic in blood vs. alveolar gas at equal partial pressure
T/F: anesthetic dissolved in blood is pharmacologically active.
False, it is inactive
Rank from most to least soluble: isoflurane, sevoflurane, halothane, desflurane
HISD
Halothane > isoflurane > sevoflurane > desflurane
T/F: A low blood-gas partition coefficient means less anesthetic dissolved in blood at equal partial pressure resulting in a short induction and long recovery.
True
What is MAC?
Minimum alveolar concentration of an anesthetic that prevents movement in 50% of patients exposed to a noxious stimuli
3 anesthetic related complications of inhalant anesthesia
hypotension, hypoventilation, hypothermia
If a patient is showing signs of hypotension or hypoventilation, what is your first step?
Evaluate patient and turn down the vaporizer
What MAP levels are considered hypotensive?
small animal <60mmHg, large animal <70mmHg
T/F: prevention of hypothermia is more effective than treatment
true
3 possibilities that could cause a CO2 rebreathing waveform (where does not return to baseline/0 between breaths)
1) insp/exp valves stuck
2) exhausted soda lime
3) inadequate O2 flow in a non-rebreathing system
