Chapter 7

  1. Define medical gases?
    Classified as laboratory gases, therapeutic gases or anesthetic gases.
  2. What are laboratory gases used for?
    Used for equipment calibration and diagnostic testing
  3. What are therapeutic gases used for?
    To relieve symptoms and improve the O2 of PTs with hypoxemia
  4. What are anesthetic gases used for?
    Combined with O2 to provide anesthia during surgery
  5. What are some characteristics about Oxygen or O2?
    • Colorless, odorless, transparent, tasteless gas
    • Not very soluble in water
  6. What is the amount of O2 in ml that dissolves in 100ml of water?
    3.3 ml dissolves in 100ml of water
  7. What is the density of O2?
  8. A large quantity is produced by?
    Fractional distillation
  9. What are some characteristics about air?
    • Colorless, odorless
    • Naturally occuring gas mixture that contains: 20.95% O2, 78.1% nitrogen and 1% trace gas
  10. What is the density of air?
  11. How is medical grade air produced?
    • Filtering and compressing atmospheric air
    • Air must be dry, free of oil and particulate contamination
  12. What are some characteristics about CO2?
    Colorless, odorless, does not support combustion
  13. How is CO2 produced?
    Heating limestone in contact with H2O
  14. What are some characteristics about helium? He
    • Odorless, tasteless, nonflammable
    • 2nd lightest gas
    • Good conductor of heat, sound and electricity but poorly soluble in water
  15. Can Helium (He) be therapeutic?
    • Must always be mixed with at least 20% O2
    • AKA Heliox
    • Used for severe asthma to reduce the work of breathing
  16. What are some characteristics of Nitrous Oxide? N2O
    • Colorless gas with a slightly sweet odor and taste
    • Used for anesthetic agent
    • Can support combustion
  17. How is N2O produced?
    Thermal decomposition of ammonium nitrate
  18. What are some characteristics of Nitric Oxide? (NO)
    Colorless, nonflammable, toxic gas that supports combustion
  19. High exposure to NO can cause what?
    • Methemoglbinemia
    • Can lead to tissue hypoxia
  20. What are the main treatments NO can be used for in infants?
    • Hypoxic respiratory failure
    • Pulmonary hypertension vasodilation
  21. What does EE stand for on gas cylinders?
    Elastic Expansion in cubic centimeters
  22. What does the star or * mean on the gas cylinder?
    If a * is next to the test date it means, DOT approved for 10 year testing
  23. What does the + sign on the gas cylinder mean?
    Means cylinder is approved for filling 10% above its service pressure
  24. What color tank is O2?
  25. What color tank is Air?
  26. What color tank is He?
  27. What color tank is Nitrous Oxide? N2O
  28. What color tank is NO, Nitric Oxide?
  29. What color tank is CO2?
  30. What letters are small tanks and what are they often used for?
    • E-AA
    • Used for transporting PTs and anesthetic gases
  31. What kind of valves do Small tanks have?
    Post valve and yoke connectors
  32. What letters are for large tanks, what kind of valve do they have?
    • F-H and K
    • Threaded valve
  33. What is the tank factor of an O2 E tank?
  34. What is the factor of an O2 G tank?
  35. What is the factor of an O2 H/K tank?
  36. What are the 3 safety systems for gas cylinders?
    • ASSS- American Standard Safety System
    • DISS- Diameter- Index Safety System
    • PISS- Pin-Index Safety System
  37. What is the pin for O2 on a PISS? Pins for air?
    • O2: 2-5
    • Air: 1-5
  38. When measuring gas filled cylinders, how is it measured?
    The volume of gas is directly proportional to its pressure at a constant temperature
  39. How do you measure cylinder contents for a liquid gas cylinders?
    Weigh the cylinder, thats how much gas is within the tank
  40. The attractive force between like molecules is called?
  41. The attractive force between unlike molecules is called?
  42. What are cylinder relief valves for?
    They're designed to vent the gas to the atmosphere if the tank is heated; this prevents tank pressure from becoming too high
  43. What is the bourdon gauge? advantage of bourdon gauge?
    • Always used in combination with an adjustable pressure
    • Advantage: not effected by gravity
  44. What is a Thorpe tube? disadvantage?
    • Used to measure true flow
    • Disadvanatge: effected by gravity
  45. When would you use a Thorpe tube? When would you use a Bourdon gauge?
    • Thorpe: hospital, bedside
    • Bourdon: transporting
  46. What is the working psi at?
  47. What are flowmeters and regulators used for?
    To control both pressure and flow
Card Set
Chapter 7
Chapter 7