Gas Anesthesia Machine

Question 1

what are the two compressed Gas Cylinders?

Answer 1

Green Tank: Contains Oxygen
Blue Tank: Contains Nitrous Oxide

Question 2

How do you read the oxygen gas cylinder?

Answer 2

Pressure gauge reads 2,200 psi when full
Reading is proportional to amount of oxygen remaining in the tank

Question 3

Define the function of the gas anesthesia machine component: Regulator

Answer 3

Reduces the oxygen line pressure to 50 psi

Question 4

How do you read the nitrous oxide gas cylinder?

Answer 4

Pressure gauge reads 750 psi when full
Reading begins to fall only after 80% nitrous oxide has been depleted therefore it is not proportional with what remains in the tank

Question 5

Define the function of the gas anesthesia machine component: Flow Meter

Answer 5

Controls the amount of oxygen entering the anesthetic circuit

Question 6

what is the oxygen flow rate formula for semiclosed rebreathing systems?

Answer 6

3(body weight in kg x 10)=__ml/min

Question 7

Define the function of the gas anesthesia machine component: Oxygen Flush Valve

Answer 7

Delivers oxygen directly to the anesthetic circuit bypassing the flow meter

Question 8

what is the oxygen flow rate formula for a non-rebreathing system?

Answer 8

body weight in kg x 300=__ml/min

Question 9

Define the function of the gas anesthesia machine component: Vaporizer

Answer 9

Liquid anesthetic is stored within its chamber.
Oxygen passes through this chamber & pics up vaporized anesthetic molecules & carries them to the patient.

Question 10

Define the function of the gas anesthesia machine component: Unidirectional Valves

Answer 10

Allow flow of gases in only one direction

Question 11

Define the function of the gas anesthesia machine component: Breathing Tubes

Answer 11

Serve to transport gases to and from the patient

Question 12

Define the function of the gas anesthesia machine component: Rebreathing Bag

Answer 12

Used as a reservoir of gases to ventilate the animal when necessary.
Should be kept 1/3 to 2/3s full during an anesthetic procedure.

Question 13

How are rebreathers bag size determined ?

Answer 13

Body Weight.
<15lbs = 1L
15-40lbs = 2L
40-120lbs = 3L
120-300lbs = 5L
>300lbs = 35L

Question 14

Define the function of the gas anesthesia machine component: Carbon Dioxide Absorber

Answer 14

Contains soda lime (CaOH) or barium hydroxide lime(BaOH) granules.
Filters out carbon dioxide (CO2) particles from the patients exhaled gases.

Question 15

Define the function of the gas anesthesia machine component: Pressure Relief Valve (Pop Off Valve)

Answer 15

Acts to release excess pressure that builds up within the patients breathing circuit.
Adjusted to maintain an adequately filled rebreathing bag in a semiclosed rebreathing system

Question 16

Define the function of the gas anesthesia machine component: Scavenger System

Answer 16

Captures waste anesthetic gases escaping through the pop off valve

Question 17

Define the function of the gas anesthesia machine component: Breathing Circuit Pressure Gauge

Answer 17

Monitors the pressure within the breathing circuit.
Used when ventilating the patient.

Question 18

List the gas anesthesia machine set up steps:

Answer 18

1. Connect the Oxygen Line
2. Connect the drop-down scavenging system line
3. Check the liquid anesthetic reservoir in the vaporizer to see if it needs to be filled
4. Check the carbon dioxide absorbing granule canister to make sure they are fresh
5. Connect breathing tubes and rebreathing bag
6. Pressure test your breathing system:
   ​– close the pressure relief valve & plug the patient-end of the breathing tube w/ the palm of your hand
   ​– fill the breathing system w/ oxygen using the flush valve or the flow meter but do not pressurize the breathing system
   – squeeze the rebreathing bag to create a pressure of 20 cm of water in the breathing system
   Check for air leaks or rapid deflation of the rebreathing bag–> This should ​​​​​​​​​​​not happen!
7. Determine the appropriate oxygen flow rate for your animal and turn the oxygen on before connecting the animal to the breathing tubes

Question 19

Gas Anesthesia Machine Take-Down Procedure

Answer 19

1. Turn off oxygen flow meter at end of anesthetic procedure
2. Open the pressure relief valve
3. Squeeze the rebreathing empty of gases
4. Disconnect the animal from the breathing tubes
5. Disconnect the breathing tubes and rebreathing bag from the gas anesthesia
   machine
6. Disconnect the gas anesthesia machine from the drop-down oxygen line
7. Disconnect the gas anesthesia machine from the drop-down scavenging system line
8. Press and hold the oxygen flush valve to release the air pressure w/in the gas
   anesthesia machine
9. Record time of use on carbon dioxide absorbing granule canister

Question 20

The flow rate for a semiclosed rebreathing system is calculated using what formula?

Answer 20

3 (body weight in kg. X 10) = ? ml/min

Question 21

the flow rate for a nonrebreathing sytem is calculated using what formula?

Answer 21

Body weight in kg. X 300 = ? ml/min

Question 22

Minimum flow rate for small animals is always?

Answer 22

500 ml/min

Question 23

Rebreathing bags should be how full during a procedure?

Answer 23

1/3 to 2/3 Full

Question 24

How do you size a Rebreathing bag?

Answer 24

By Weight.
<15 1bs. = 1 L
15-40 lbs. = 2 L
40-120 lbs. = 3 L
120-300 1bs. = 5 L
>300 lbs. = 35 L

Question 25

Anesthetic Breathing Systems function

Answer 25

is to deliver fresh anesthetic gases to the patient and removal of exhaled carbon dioxide from the patient.

Question 26

Rebreathing System

Answer 26

Allow the rebreathing of exhaled gases minus the carbon dioxide

Question 27

Rebreathing system benefits

Answer 27

• Low oxygen flow rates can be used
  *Ventilation is readily observed and controlled by ​​​​​​rebreathing bag
  *Minimal heat loss and airway drying

Question 28

Nonrebreathing System

Answer 28

Allow minimal or no rebreathing of exhaled gases

Question 29

Norman Mask Elbow (Mapleson F System)–

Answer 29

Fresh gas enters breathing tube where patient is attached, exhaled gases exit through rebreathing bag