Anesthesia Machine

Question 1

Gas Cylinder Colors

Answer 1

Yellow: Air; 
Green: Oxygen; 
Brown: Helium; 
Grey: CO2
Blue: NO2
Black: Nitrogen

Question 2

Empty E-Cylinder Weight

Answer 2

5.8 lbs

Question 3

Circle System Check

Answer 3

Extends from CGO to the Y-pieceLeak test: occlude y-piece, close APL, pressurize to 30 mmHg using the O2 flush valve

Question 4

Machine Check Overview (8 Items)

Answer 4

1. Gas Line Connections
2. Integrity of seal system
3. Low Pressure Circuit Test
4. Vaporizer Levels
5. O2 Analyzer
6. Circle Circuit Test
7. Flow Meter Controls
8. Ventilator

*check analyzer by exposing to room air and reading 21%

Question 5

Intermediate Pressure System (7 Items)

Answer 5

1. Master Switch (pneumatic part)
2. Pipeline (wall) Inlets
3. Pipeline Valves, gauges
4. O2 pressure-failure device
5. O2 flush valve
6. Oxygen second stage regulators
7. Flow meter valves
   * O2 inlet will be 50 psi, cylinder will be 45-50 or just slightly lower than inlet; system pressure 45-50 psi

Question 6

5 Pathways of Oxygen

Answer 6

1. Flow to the fresh gas meters2. Powers the oxygen flush valve3. Activates failsafe valve4. Activates oxygen low pressure alarm5. Compresses bellows

Question 7

Low Pressure Circuit Test

Answer 7

Checks from flow control valves to CGO. Place suction valve on CGO and squeeze till collapsed; must remain collapsed for 10 seconds or more. Also check individual vaporizers for leaks

Question 8

Oxygen Failsafe Shut Off Pressure

Answer 8

25-30 psiMost are Proportioning Type (OFPD); drop N2O based on O2 PRESSURE not FiO2. Located downstream of N2O source; shuts off or proportionally reduces N2O flow if O2 decreases to prevent hypoxia

Question 9

PISS system configurations:

1. O2
2. N2O
3. Air
4. CO2
5. Heliox

Answer 9

1. 2,5
2. 3,5
3. 1,5
4. 1,6
5. 2,4

Question 10

Bobbin Flow Types

Answer 10

1. Low Flow: tubular flow (diameter of channel < than length), laminar in nature so VISCOSITY is important 2. High Flow: gas flowing around bobbin through orifice (diameter of channel > length) gas flow is turbulent so DENSITY important

Question 11

Oxygen Cylinder: contents and pressure

Answer 11

625-700L; 2000-2000 psi

Question 12

First Stage Pressure Regulator:
1. O2
2. N2O
Second Stage Pressure Regulator:
1. O2
2. N20

Answer 12

First Stage:
02: 2000 -> 45
N2O: 745 -> 45
Second Stage:
O2: 45 -> 14
N2O: 45 -> 26

Question 13

Low Pressure System (6 items)

Answer 13

Pressure slightly above atmospheric

1. Flow Meter Tubes
2. Proportioning Links
3. Vaporizer
4. Check Valves
5. Pressure Relief Device
6. Common Gas Outlet
   * most susceptible to leaks; O2 ANALYZER only alarm in low pressure*O2 always furthest right on tubes (downstream)

Question 14

Nitrous Oxide Cylinder: contents and pressure

Answer 14

1590L; 750 psi full; when all liquid N2O is vaporized, will be 250L

Question 15

Oxygen Flush Valve flow rate

Answer 15

35-75 L/minCan cause barotrauma; only use during expiration

Question 16

High Pressure System Components

Answer 16

Pressure > 45 psiCylindersHanger yokeCylinder pressure gaugeCylinder pressure regulator

Question 17

Pressurized Air Cylinder: Contents and Pressure

Answer 17

Approx 625L; 1900-2000 psi