6 Anesthesia Machine

Question 1

How to check low pressure leak, best test of what

Answer 1

Negative pressure test, bulb to common gas outlet, fails if inflates in 10 seconds. All flows and vent off, test each vaporizer (best test of vaporizer leak)

Question 2

How to do high pressure leak test, how check valve affects what is tested

Answer 2

Close apl and pressurize to 30. If check valve- assesses breathing circuit and low p system up until valve. If no check valve- entire low pressure system

Question 3

5 tasks of oxygen

Answer 3

02 pressure failure alarm, 02 pressure failsafe device, flowmeter, flush valve, and vent drive gas

Question 4

Cylinder colors air, 02, nitrous

Answer 4

Air: black and white. 02: green. Nitrous: blue

Question 5

Air: max p, max vol, pin

Answer 5

1900 psi, 625 l

Question 6

O2: psi, L

Answer 6

1900 psi 660 l

Question 7

Nitrous: psi, L, wt when full v empty

Answer 7

745 psi, 1590l. 20.7 lb, 14.1 lb

Question 8

How to calc time left in cylinder

Answer 8

L/psi when full = contents remaining /psi. Then divide answer (L) by LPM flow rate

Question 9

When to change nitrous tank

Answer 9

Any time it falls below 745 psi

Question 10

Safety relief devices for cylinder

Answer 10

Fusible plug that melts w elev temp (bismuth, lead, tin, cadmium), valve that opens at elev pressures, a frangible disc that ruptures under pressure

Question 11

Failsafe is in which system, 2 components

Answer 11

Intermediate. Alarm when 02 pressure below 30 psi. Stops or dec nitrous when pressure in 02 pipe falls below 20 psi

Question 12

What hypoxia prevention device does

Answer 12

Limits n20 flow to 3x the 02 flow

Question 13

Reynolds: laminar v turbulent dependent on what

Answer 13

Laminar- gas viscosity. Turbulent- gas density

Question 14

Fi02 calc

Answer 14

Air flow rate x21 plus 02 flow ratex100 / total flow rate

Question 15

With fresh gas coupling how to calc tidal vol delivered

Answer 15

Vt set on vent + fgf on insp - vol lost to compliance

Question 16

How to calc vol lost to circuit

Answer 16

Compliance x peak pressure

Question 17

Pumping effect

Answer 17

Increases vaporizer output, anything that causes gas that has left vaporizer to re-enter it

Question 18

What increases pumping effect

Answer 18

Low fgf, low conc dial setting, low levels of anesthetic in vap chamber

Question 19

How to calc how long vaporizer agent will last

Answer 19

Ml used per hr= vol% x fgf (l/min) x 3

Question 20

How to calc vaporizer output at elevation

Answer 20

Normal dial setting in % x 760 / ambient pressure mmhg

Question 21

How altitude effects des output

Answer 21

Lower pressure/higher altitude requires higher setting.

Question 22

First monitor to detect a pipeline crossover

Answer 22

O2 analyzer

Question 23

02 flush valve pressure and rate q

Answer 23

50 psi, 35-75 l/min

Question 24

2 ways to reduce barotrauma risk

Answer 24

Decoupling fresh gas and insp pressure limiter

Question 25

When pos pressure and neg pressure relief valves open

Answer 25

75 cm h20 and -8 cm h20

Question 26

Variables in VCV vs PCV

Answer 26

VCV: PIP, PCV: TV, insp time

Question 27

Pts w low compliance

Answer 27

Preg, obese, lap, ARDS

Question 28

When bipap is useful

Answer 28

Pts w COPD when CPAP isn’t enough

Question 29

What is a/w pressure release vent, when useful

Answer 29

Spont vent mode like bipap, released at preset intervals to help exhale. Useful in ARDS

Question 30

IRV: useful in who, risk of what, requires what

Answer 30

Small FRC or ARDS. Risk of auto peep/breath stacking. Req sedated and paralyzed

Question 31

Soda lime rxn

Answer 31

CO2 + h20= h2co3. H2co3 + Naoh= na2co3 + h20 + heat. Na2c03 + ca(oh)2 = caco3 + naoh

Question 32

Best mesh size for soda lime

Answer 32

4-8 mesh

Question 33

When ph falls to what will ethyl violet change color

Answer 33

10.3

Question 34

Desiccated soda lime inc produc of what, IA most to least. And what with only Sevo

Answer 34

CO. Des, iso, sevo. Compound A.

Question 35

Most unstable IA in presence of soda lime

Answer 35

Sevo

Question 36

Benefits of amsorb plus, what it uses. Cons

Answer 36

Caoh. No CO produc, almost no compound a, lower fire risk. Cons: less absorptive than soda lime

Question 37

Max ppm halogenated alone, nitrous alone, and both

Answer 37

Halogenated 2 ppm, nitrous 25 ppm, both: <0.5 and 25

Question 38

Water content of soda lime

Answer 38

15%