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Anesthesia Principles 1 > Anesthesia Gas machine > Flashcards

Anesthesia Gas machine Flashcards

1
Q

High Pressure components

A

Hanger Yoke
Yoke block w/ check valves
Cylinder pressure gauge
Cylinder pressure regulator

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2
Q

Intermediate Pressure components and psi

A

Begins at pipeline and ends at flowmeter valves

pipeline inlets
pressure gauges
O2 pressure failure device
O2 second stage regulator
O2 flush valve
Ventilator power inlet
Flowmeter valves

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3
Q

Low Pressure components

A

Flowmeter tubes (Thorpe)
Vaporizers
Check valve
Common Gas outlet

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4
Q

What does the low-pressure leak test assess?

A

the integrity of the low-pressure circuit from flowmeter valves to common gas outlet

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5
Q

High pressure leak test assesses the integrity of the….

A

low-pressure system and the breathing circuit

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6
Q

What are the 5 Tasks of O2 in the SPDD Model

A
  1. O2 pressure alarm
  2. O2 pressure failure devices
  3. O2 Flowmeter
  4. O2 Flush valve
  5. Ventilator drive gas
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7
Q

What does the PISS prevent?

A

Connecting the wrong cylinder to the anesthesia machine

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8
Q

PISS configurations (Air, O2, Nitrous Oxide)

A

Air = 1, 5
O2 = 2, 5
Nitrous = 3,5

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9
Q

What does the DISS system prevent?

A

Wrong gas hose connected to AGM

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10
Q

Cylinder Pressure of Air, O2 and NO2

A

Air = 1,900 psi
O2 = 1,900 psi
Nitrous Oxide = 745 psi

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11
Q

Max Volume of cylinders

A

Air = 625 L
O2 = 660 L
Nitrous Oxide = 1,590 L

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12
Q

Equation for how much O2 is in cylinder

A

Tank capacity (L) / Full tank pressure (psi)
X
Contents remaining (L) / Gauge pressure (psi)

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13
Q

How long will tank last? (equation)

A

Contents remaining (L) / FGF rate (L/mnin)
=
Minutes before tank expires

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14
Q

Oxygen pressure failure device (failsafe) will not….

A

WILL NOT alarm with O2 pipline crossover (measures pressure, NOT O2 concentration)

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15
Q

Oxygen pressure failure device (failsafe) will….

A

Will alarm when O2 tank is depleted, drop in O2 pipeline pressure, or dissconnected O2 hose

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16
Q

How to calculate FiO2

A
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17
Q

How to calculate O2 Flow Rate (L/min)

A

Add 4% for each liter after 1L being 24% to a max of 44% (6L)

18
Q

To ensure precise vaporizer output, the desflurane vaporizer heats the liquid anesthetic to ______ and __________.

A

39 C
pressurizes it to 2 atmospheres

19
Q

The Tec 6 vaporizer does not ________.

A

does not compensate for changes in elevation

20
Q

A ________ requires a higher setting on the dial of the Tec 6 vaporizer.

A

Lower ambient pressure (higher altitude)

21
Q

A _________ requires a lower setting on the dial in a Tec 6 vaporizer.

A

higher ambient pressure (hyperbaric oxygen tank)

22
Q

What is the FINAL defense against delivery of a hypoxic mixture?

A

Oxygen Analyzer!!!

-its the only device that measures O2 concentration

23
Q

Variable bypass method of vaporization?

A

Flow over

24
Q

Tec 6 Desflurane method of vaporization?

A

Gas/Vapor blender (heat generates vapor that is injected into the fresh gas)

25
Q

Steps if you have O2 pipeline failure.

A
  1. turn on O2 cylinder and disconnect pipeline O2 supply
  2. verify if O2 concentration is increasing, IF NOT, then ventilate the pt w/ ambu bag connected to a DIFFERENT O2 tank (you will also need to convert to a TIVA(you no longer have gas since you are no longer using the AGM)
26
Q

Oxygen flush valve O2 flow

A

35-75 L/min

27
Q

Oxygen flush valve O2 pressure

A

50 psi

28
Q

The mechanical spill valve is ________ during the inspiratory phase.

Pressing the O2 flush during inspiratory phase will…….

A

Closed!

transfer this pressure to pts lungs …… BAROTRAUMA!

29
Q

Ascending bellows _______ during expiration.

A

Rise
-Safer since if there is a circuit disconnect they will not continue to rise and fall.

30
Q

Descending bellows _______ doing expiration.

A

Fall

31
Q

VCV setting

A

preset TV over a predetermined time

-Fixed = TV, inspiratory flow rate and inspiratory time

Variable= PIP

32
Q

PCV setting

A

-preset inspiratory pressure over a predetermined time

Fixed = PIP and inspiratory time

Variable = TV and inspiratory flow

33
Q

T-burg will ______Vt.

A

decrease from decreased compliance

34
Q

When is PCV better than VCV?

A
35
Q

1st and 2nd most common causes of low pressure in circuit?

A
  1. circuit disconnect
  2. co2 absorbent canister has poor seal or defective
36
Q

Semi-open breathing circuit

A

FGF>minute ventilation

37
Q

semi-closed breathing circuit

A

FGF< minute ventilation

38
Q

Most common circle system related causes of rebreathing

A

-Incompetent unidirectional valve
-Exhausted CO2 absorbent

39
Q

Malfunction of unidirectional valves = ?

A

the space between the y-piece and the valve to be dead space (risk of hypercarbia)

40
Q

Best circuit for spontaneous ventilation? Worst?

A

Mapleson A (B is the worst)

41
Q

Best circuit for controlled ventilation? Worst?

A

Mapleson D (A is the worst)

Anesthesia Principles 1 (11 decks)

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