Breathing Circuits and Mask/Chamber Induction Flashcards
(28 cards)
a non-precision vaporizer is considered what kind of vaporizer (in or out of circuit)
vaporizer-in-circuit (VIC)
what type of vaporizer: O2 flows into breathing circuit from flow meter, circulates before entering vaporizer
Vaporizer-in-Circuit (non-precision vaporizer)
how to estimate % of anes gas given when using a non-precision vaporizer ( what factors to look at)
look at respiration rate and depth, if increasing=more gas is passing
or consider room temp, the higher the room temp the more vaporization of gas is occurring
a non-precision vaporizer is safe to use w what anes gas
methoxyflurane (bc low VP)
a precision vaporizer is considered what kind of vaporizer (in or out of circuit)
vaporizer-out-of-circuit (VOC)
what type of vaporizer: O2 flows into vaporizer BEFORE entering breathing circuit
Vaporzier-out-of-circuit (precision vaporizer)
a total rebreathing system is used for patients of what size
15 lb or larger
in a total rebreathing system, how often is fresh gas added
every time patient inspires
in which breathing circuit is pop-off valve closed
total rebreathing (circle system)
in which breathing circuit is pop-off valve partially open
partial rebreathing system
danger of a total rebreathing system
pressure can build up (watch pressure manometer) which can cause lung damage
total rebreathing system O2 flow rate
15ml/kg/min
a partial rebreathing system is used for patients of what size
15 lbs or larger
O2 flow rate of partial rebreathing system
25-50 ml/kg/min
downside of a partial rebreathing system compared to total rebreathing
more O2 used, less cost-efficient
a non-rebreathing system is used on animals of what size
less than 15 lbs/ 7 kg
O2 flow rate of non-rebreathing system
130-300 ml/kg/min
pros of a non-rebreathing system
allows for rapid change in anes depth (more safe bc can quickly be altered if too deep)
why non-rebreathing systems used for small patients
less respiratory strength is needed, requires less lung strength, less temp is lost, less dead space
how to pressure check a non-rebreathing system
1) close toggle switch (acts like pop-off valve)
2) occlude patient connector and scavenger hose
3) turn on flow meter to fill bag, if it stays inflated for >10 sec = no leak
alternative routes of induction (besides injectables)
mask or chamber induction
in what cases mask induction and chamber induction is useful
animals w/ underlying disease (avoid injectable drug side effects), fractious, induce/recover quickly, pregnant animals (avoid fetus side effects)
mask induction works best w what anes gases
ones w high VP (iso, sevo, halothane) not desflurane bc smell can cause coughing and breath holding
mask induction procedure
give 100% O2 for 2-3 min allowing patient to adjust
set vaporizer to .5% iso, gradually increase until at 3-5%
