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Intro to Anesthesia: Part A > Medical Gases > Flashcards

Medical Gases Flashcards

1
Q

2 Sources For Gas

A

Inlet gas or E-cylinder

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2
Q

Gas Colors:

  1. O2
  2. N2O
  3. Air.
  4. N
  5. H
A
  1. Green
  2. Blue
  3. Yellow
  4. Black
  5. Brown
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3
Q

Regulatory Agency for:

  1. Gas purity/contents
  2. Manufacturing and everything else
A
  1. FDA

2. DOT

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4
Q

Vapor Pressure: Enflurane

A

172 mmHg

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5
Q

Vapor Pressure: Isoflurane

A

240 mmHg

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6
Q

Vapor Pressure: Halothane

A

244 mmHg

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7
Q

Vapor Pressure: Sevoflourane

A

160 mmHg

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8
Q

Vapor Pressure: Desflurane

A

669 mmHg

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9
Q

Latent Heat of Vaporization

A

Calories required to change 1g of liquid to vapor (without temp change)

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10
Q

Specific Heat

A

Calories required to increase temperature of 1 gram of substance by 1 degree C

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11
Q

Altitude effects on:

  1. Variable Bypass
  2. Tec 6
A
  1. At high altitude/lower barometric pressure, deliver higher concentration of anesthetic; at low altitude/high barometric pressure, delivering lower concentration of gas
  2. At high altitude/lower barometric pressure, you deliver lower concentration of anesthetic; at lower altitude/higher barometric pressure, delivering higher concentration of gas.
    * Vaporizers must be calibrated based on the altitude
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12
Q

TEC 6:

  1. Flow and control of gas
  2. Internal pressure
A
  1. 2 paths; diluent flow, gaseous Des that meet at outflow; Des concentration controlled by differential pressure transducer and dial controlled by anesthetist
  2. 1500 mmHg (twice atmosphere) of Desflourane
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13
Q

Minimal Carrier Gas flow for Sevo

A

2 L/min

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14
Q

Cylinder Permanent Markings:

  1. DOT3AAA
  2. 2015 psig
  3. Next line #
    • sign
    • sign
A
  1. DOT specification #
  2. Maximum pressure in PSI
  3. Manufacture serial number
  4. Can fill up to 10% more than max pressure
  5. Can be serviced every 10 years instead of 5
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15
Q

Nitrous Oxide Pressure/Volume/Weights at:

  1. Full
  2. Half Full
  3. No Liquid N20
  4. Nearly Empty
A
  1. 745 psi, 1590 L, 20.7 lbs
  2. 745 psi, 795 L, 17.3 lbs
  3. 745 psi, 250 L, 14.2 lbs
  4. 350 psi, 125 L, 14.1 lbs
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16
Q

Cylinder Labels:

  1. White Panel
  2. Diamond Shape
  3. Signal Words
A
  1. First label on left; denotes the name of the contained gas
  2. Denotes hazard class of contained gas
  3. Words like CAUTION or WARNING that elaborate on hazards and prevention measures
17
Q

Cylinder Tags

A

Denote amounts only, do not identify; will have FULL, IN USE, or EMPTY connected by perforations

18
Q

DISS system components

A

Diameter Index Safety System, provides non-interchangeable connections; consists of nipple and nut on pipeline and body on machine

19
Q

Cylinder Safe Handling (7 items)

A
  1. Never stand upright without support
  2. Never leave empty cylinder on machine
  3. Never leave plastic on ports while installing
  4. Never rely only on cylinder COLOR
  5. Never oil valves
  6. Always crack slowly away from other personal to expel debris
  7. Valve should always be fully open when in use.
20
Q

Vaporization Definition

A

Molecules of a liquid constantly convert to a gas; evaporation is a surface phenomenon that occurs naturally; vaporization depends on vapor pressure, temperature, and type of carrier gas

21
Q

Vapor Pressure Definition

A

Pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid’s evaporation rate.

22
Q

Thermal Conductivity

A

Measure of speed with which heat flows through a substance; higher thermal conductivity, better substance conducts heat

23
Q

Boiling Point

A

Occurs when vapor pressure=atmospheric pressure

24
Q

3 characteristics of vaporizers

A

Agent Specific, Temperature compensated, variable bypass

25
Q

Flow of gas in vaporizer (6 items)

A
  1. Inlet port
  2. Pressure compensator
  3. Vaporizing chamber
  4. Over anesthetic agent
  5. Past control cone
  6. Through outlet port
26
Q

Vaporizer control components (4)

A
  1. Concentration dial
  2. Temperature compensating bypass
  3. Control cone
  4. Internal on/off switch

Intro to Anesthesia: Part A (6 decks)

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