Gas Machine pt2 Flashcards
point at which fresh gas enters breathing circuit
fresh gas inlet
what is a reservoir bag
(rebreathing bag) holds fresh and recirculated gas to be inhaled
the inspiratory breathing tube, thro which the patient breaths, is attached to
the inspiratory unidirectional valve (gives fresh and recirculated breath)
this piece attaches to the inspiratory and expiratory tubes, and endotracheal mask
y-piece
this valve controls whether system is open, partial, or closed (all gas retained)
pressure relief valve (pop-off valve)
what a reservoir bag is used for
observe respirations, confirm ET placement, manual ventilation
formula for calculating reservoir bag size
tidal volume x 6
where the pressure manometer is located and what it does
on top of CO2 absorber, indicates pressue in airways and lungs
the pressure in the patients airways and lungs shouldn’t be less than
<15 cm H20 or <11mmHg
to open the pop-off valve turn _____ if bag is too full
to close turn ____ if bag not full enough
open= counter-clockwise (L) closed= clockwise (R)
steps for ventilating (bagging) a patient
close pop-off valve, squeeze bag watching manometer, re-open valve
what the air-intake/ neg-pressure relief valve does
allows room air into circuit if vacuum is detected (we don’t control)
when would a vacuum be created (and the neg-pressure relief valve kicks on)
O2 tank empties or if pop-off valve is too open, reservoir bag deflates, and the animal inhaling causes a vacuum
how long a CO2 canister lasts
6-8 hr of surgery (will start to turn purple)
when to open/close moisture relief valve
open when machine is turned off, closed when using
how often to change a charcoal filter system
6-8 hr of use, or when has gained 50 lbs in weight
steps in testing rebreathing circuit pressue and for leaks
- close pop-off
- open O2 tank outlet valve
- occlude opening of Y piece
- fill rebreathing bag till pressure manometer reads 30 cm H2O (if after 10sec the pressure hasn’t dropped below 25= no leak)
when to bag
- apneic or undergoing cpr
- chest cavity is open (no negative pressure)
- a neurotransmitter blocker is used (cant effectively breath)
- reflate alveoli after alectasis
- flushout CO2
a decrease in reservoir bag movment means
- decreased RR or Vt
- ET cuff not inflated properly or ET too small in diameter (gas is going around)
- tube not in trachea
why a reservoir bag may be over full
- O2 flow rate too high
- bag too small
- pop-off valve not open enough
- scavenging problem(not sucking enough out)
why a reservoir bag may collapse
- O2 flow rate too low
- O2 tank empty
- bag too small (empties w each breath)
- pop-off valve too open
- problem w scavenging (sucking everything out)
O2 flow rate for a rebreathing circuit
15-50 ml/kg/min
