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Flashcards in Anesthesia Machine Deck (49)
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1

What would result from delivering atmospheric air for anesthesia?

Hypoxia- due to hypoventilation and V/Q mismatch caused by anesthetics

2

Minimum O2 requirement for anesthesia

30-35% O2

Atmospheric is 21%

3

Metabolic O2 requirement

5-10mL/kg/min

Represents the minimum O2 flow required

4

Gasses

O2
Nitrous oxide
Medical air

5

Two types of O2 cylinders

E- usually in singles, attached to machine via a yoke

H- stored in banks, central O2 supply

6

Green Cylinders

Oxygen

7

Blue Cylinders

Nitrous oxide

8

Yellow Cylinders

Medical Air

9

Why are cylinders stored on their sides?

To prevent explosion and avoid spontaneous combustion

10

Cylinder pressure units

psi

11

Breathing system pressure units

cmH2O

12

High Pressure systems

100-2200+psi

Gas cylinders, yokes, pressure gauges, regulators

13

Intermediate pressure systems

50psi

Central O2 supply, post-regulatory, flush valve, input to flowmeter, driving gas for ventilator

14

Low pressure systems

pressure in patients lungs

15

E-cylinder capacity

660L (need to memorize)

16

H-cylinder capacity

6600L

17

Internal cylinder pressure

2200psi

18

How do you figure out volume left in tank?

Boyle's law

P1V1=P2V2

19

How do you figure out time left on remaining volume?

Minutes = Volume/(flow liters/min)

20

Can you calculate remaining volume on N2O tanks?

NO- exists as both a liquid and a gas in the tanks and the pressure will only read the gas portion

21

Components to the safety systems

1. Colour coding
2. Labeling
3. Diameter index safety system
4. Pin index system
5. Quick connectors

22

Diameter index safety system

Non-interchangeable gas-specific threaded connection system

Universal between equipment cylinder manufacturers

23

Pin index safety system

Gas-specific pin patters that only allow connections between appropriate cylinder yokes and E-tanks

Commonly found on yokes and some cylinder-specific regulators/flowmeters

24

Quick connectors

Manufacturer-specific

Facilitate rapid connecting/disconnecting of gas hoses

25

Regulator

Aka pressure reducing valve

Decreases tank pressure to approximately 50psi and supplies to the flowmeter

Prevents pressure fluctuations as tank empties

26

Flowmeter

Controls rate of gas flow through the vaporizer (L/min)

Calibrated for 760mmHg and 20C

27

Flowmeter pressure reduction

50psi to 15psi

28

Where do you read the flowmeter?

Middle of ball or top of bobbin depending on type

29

Where should the O2 flowmeter be positioned if there are multiple gas flowmeters? Why?

Far right, to avoid hypoxic mixtures.

30

Quick flush

Delivers intermediate pressure O2 bypassing the vaporizer