Anestehesia machine and breathing circuts

Question 1

How do you determine how many L of gas are left in E-tank

Answer 1

at 2000 psi = 660L

Current psi/2000=X/660L

Question 2

Characteristics of nitrogen gas

Answer 2

Liquid in tank
P will remain the same until tank is empty
Weigh tank for volume remaining

Question 3

Characteristics of regulator

Answer 3

Brings pressure from high to intermediate
Gauge used to tell how much pressure is in O2 tank
Regulating knob
System pressure gauge

Question 4

Oxygen flush valve

Answer 4

Bypasses flowmeter and vaporizer
Dilutes inhalant in the system
Use when getting ready to disconnect patient

Question 5

Flowmeter

Answer 5

Intermediate to low pressure

Sends oxygen to the vaporizer

Question 6

Vaporizer

Answer 6

Agent specific
temperature compensated
Requires bypass chamber

Question 7

Pressure gauge

Answer 7

measure pressure using controlled or assisted ventilation

tells you how much P is going into patients lungs

Question 8

Pop off valve

Answer 8

left open

Question 9

What happens when you close the pop off valve

Answer 9

P is going to build up in the system

close to give breaths

Question 10

Fresh gas inlet

Answer 10

Where the O2 and inhalant come out (to the patient)

Question 11

Scavenger: passive

Answer 11

P in the system will push the gas out

Cheap

Question 12

Scavenger: active

Answer 12

uses negative P for flow
Needs regulating valve
Expensive

Question 13

Circle system (rebreathing): unidirectional valves

Answer 13

Prevent rebreathing of CO2

Question 14

Circle system: canister w/ absorber

Answer 14

Sodalime or baralyme

Turns to purple when exposed to CO2

Question 15

Circle system: breathing bag

Answer 15

Reservoir
Deliver breaths manually
6x the tidal volume of patient
protection against excessive P

Question 16

If you increase the distance of the tubing will it increase rebreathing in the patient

Answer 16

No, the Y piece is still the same

Question 17

Non rebreathing system characteristics

Answer 17

Elimination of CO2 by high O2 flow

Question 18

How do you check for leaks

Answer 18

Close pop off
thumb on patient end of breathing hose
press flush valve until P is 30 cm
If no leak P will hold

Question 19

When do you open pop off valve when checking for leaks

Answer 19

before removing thumb from patient hose

Question 20

What happens if the reservoir bag inflates when testing non-rebreathing system

Answer 20

inspiratory hose is leaking

Question 21

PEEP valve

Answer 21

positive end expirator pressure

prevents lung from collapsing at the end of expiration

Question 22

Epiglottis anatomy

Answer 22

ventral, push on base of tongue to open

Question 23

How to verify if you are in the trachea

Answer 23

arytenoids are on both sides of tube
palpate tube
air movement

Question 24

Laryngospasm

Answer 24

happens during intubation or extubation
Cats
Prevent by using lidocane