Breathing Circuits and Mask/Chamber Induction Flashcards
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%
mask induction flow rate for <10kg animal v over 10kg
<10kg= 1-3 L/min
over 10 kg= 3-5 L/min
downsides of chamber induction
risk of vomiting, may have prolonged stage II (involuntary movements and struggling), more gas is wasted than if mask induction were used
when to not use chamber induction
if quick intubation is needed (brachycephalic, unfasted, resp. disease, diaphragmatic hernia)
O2 flow rate of chamber induction, iso set to __%
5L/min, 3-5% iso
