Anestehesia machine and breathing circuts Flashcards
How do you determine how many L of gas are left in E-tank
at 2000 psi = 660L
Current psi/2000=X/660L
Characteristics of nitrogen gas
Liquid in tank
P will remain the same until tank is empty
Weigh tank for volume remaining
Characteristics of regulator
Brings pressure from high to intermediate
Gauge used to tell how much pressure is in O2 tank
Regulating knob
System pressure gauge
Oxygen flush valve
Bypasses flowmeter and vaporizer
Dilutes inhalant in the system
Use when getting ready to disconnect patient
Flowmeter
Intermediate to low pressure
Sends oxygen to the vaporizer
Vaporizer
Agent specific
temperature compensated
Requires bypass chamber
Pressure gauge
measure pressure using controlled or assisted ventilation
tells you how much P is going into patients lungs
Pop off valve
left open
What happens when you close the pop off valve
P is going to build up in the system
close to give breaths
Fresh gas inlet
Where the O2 and inhalant come out (to the patient)
Scavenger: passive
P in the system will push the gas out
Cheap
Scavenger: active
uses negative P for flow
Needs regulating valve
Expensive
Circle system (rebreathing): unidirectional valves
Prevent rebreathing of CO2
Circle system: canister w/ absorber
Sodalime or baralyme
Turns to purple when exposed to CO2
Circle system: breathing bag
Reservoir
Deliver breaths manually
6x the tidal volume of patient
protection against excessive P
If you increase the distance of the tubing will it increase rebreathing in the patient
No, the Y piece is still the same
Non rebreathing system characteristics
Elimination of CO2 by high O2 flow
How do you check for leaks
Close pop off
thumb on patient end of breathing hose
press flush valve until P is 30 cm
If no leak P will hold
When do you open pop off valve when checking for leaks
before removing thumb from patient hose
What happens if the reservoir bag inflates when testing non-rebreathing system
inspiratory hose is leaking
PEEP valve
positive end expirator pressure
prevents lung from collapsing at the end of expiration
Epiglottis anatomy
ventral, push on base of tongue to open
How to verify if you are in the trachea
arytenoids are on both sides of tube
palpate tube
air movement
Laryngospasm
happens during intubation or extubation
Cats
Prevent by using lidocane
