Equipment 2 Breath Systems

  1. What is the function of breathing systems?
    • deliver oxygen
    • deliver anesthetic agent
    • remove carbon dioxide
  2. What are the three different types of breathing systems?
    • rebreathing
    • non-rebreathing
    • old open drop method
  3. What are the two types of rebreathing systems?
    • total rebreathing
    • partial rebreathing
  4. What is total rebreathing?
  5. What is partial rebreathing?
  6. What kind of anesthesia machine do you use for rebreathing?
    circle anesthesia machine
  7. What is non-rebreathing?
  8. What are the two different attachments we can use for non-rebreathing?
    • Bain
    • Ayres T-piece
  9. What is the old open drop method?
    • original anesthesia machine
    • inaccurate and dangerous
  10. Describe how old open drop method works.
    • uses room air
    • liquid anesthetic on cloth or cotton ball
  11. What are the differences between the breathing systems?
    • are exhaled gases breathed in or not?
    • different O2 and N2O flow rates
    • position of pop-off valve (open or closed)
    • type of equipment used (circle anesthesia machine, attachments)
  12. How does the rebreathing system work?
    • patient rebreathes some exhaled gases
    • CO2 is removed
    • new O2 and anesthetic vapor is added
  13. How does the total rebreathing system work?
    • pop-off valve is closed
    • low fresh gas flow rate
    • rebreath everything, the only thing that is replaced is what is used up in the body
    • recirculates all exhaled gases except CO2
  14. What are the advantages of the total rebreathing system?
    • cheaper - conserves O2 and anesthetic vapor
    • conserves patient body heat and moisture
    • less room air pollution
  15. What are the disadvantages to the total rebreathing system?
    • not as safe
    • CO2 may build up
    • pressure may build up
    • can't change anesthetic concentration as quickly
    • may get O2 depletion and N2O buildup
    • avoid use in patients under 20kg - makes it hard for them to breathe and push air all the way through system
  16. How does partial rebreathing work?
    • pop-off valve open or partly open
    • higher fresh gas flow rate
    • some exhaled gases removed by scavenger
  17. What are the disadvantages of partial rebreathing?
    • more expensive
    • uses more O2 and anesthetic agents
  18. What are the advantages of partial rebreathing?
    safer than total rebreathing
  19. How does non-rebreathing systems work (NRB)?
    • little or no exhaled gas is rebreathed by patient
    • exhaled gases are removed by scavenger
  20. What attachements do the NRB system use and what attachments do they not use?
    • Use: O2 tank, flowmeter, vaporizer
    • Not use: breathing tubes, flutter valves, CO2 absorber, manometer
  21. What are the components to a NRB system?
    • fresh gas inlet
    • reservoir bag
    • tubing
    • scavenger outlet
    • endotracheal tube connection
  22. When do we use NRB systems?
    • good for small patients under 7 kgs (15 pounds)
    • less resistance, easier to breathe
  23. When do we usually not use NRB systems?
    not used in large animals (it will work but it's just too expensive)
  24. What kind of O2 flow rates do NRB systems use?
  25. Do NRB systems have a CO2 absorber?
  26. What are the advantages of NRB systems?
    • low resistance - gas flow not impeded by soda lime, valves
    • less effort to breathe
    • not as heavy and bulky as circle system - less drag on patient's endotracheal tube
    • can change anesthetic depth quickly
  27. What are the disadvantages to NRB systems?
    • high gas flow - expensive in large animals
    • room air pollution if not scavenged properly
    • loss of body heat and moisture
  28. Which vaporizer is the most complicated and most expensive?
    precision vaporizer
  29. Precision vaporizers are designed to do what?
    deliver exact % of anesthetic specified by anesthetist
  30. What is the maximum vapoizer percent used with volatile anesthetics (halothane, iso, sevo)?
  31. What will happen if a patient if 30% of vaporizer is delivered?
    it will be fatal
  32. What vaporizer percent do we usually use for iso?
  33. What vaporizer percent do we usually use with sevo?
  34. How do we use the dial on the percision vaporizer?
    depress lock button to get it off zero then turn the dial
  35. Precision vaporizers are designed for what kinds of anesthetic?
    • halothane
    • isoflurane
    • secoflurane
  36. What do you do if you accidently put in the wrong anesthetic liquid into the vaporizer?
    • drain it
    • flush it with O2
    • air it out overnight
  37. What do we use the indicator window for in the precision vaporizer?
    • is there enough fluid for next anesthetic procedure?
    • is fluid nice and clear?
  38. What are the other factors that affect % anesthetic that is delivered?
    • temperature
    • flow rate
    • back pressure
  39. What does VOC stand for?
    vaporizer out of circle (rebreathing gas)
  40. What is the position of the precision vaporizer?
    outside of the patient breathing circuit
  41. Why do we use non-precision vaporizers over precision vaporizers?
    • simpler
    • cheaper
    • easier to care for
    • use with non-volatile anesthetic agents (methoxyflurane)
  42. What is the stephen's vaporizer?
    no wick - evaporation less efficient, safer for volatile anesthetics
  43. What are the advantages to using a non-precision vaporizer?
    • cheap
    • uses low flow rates
    • saves O2 and anesthetic
    • vaporizer itself is cheaper
  44. What are the disadvantages to using a non-precision vaporizer?
    • does not compensate for temperature, carrier gas flow rate, or back pressure
    • less precise control of anesthetic depth
    • glass jar breakage
  45. Image Upload 1
    What is this?
    circle anesthesia machine
  46. Image Upload 2
    What kind of attachment is this?
    bains circuit
  47. Image Upload 3
    What kind of attachement is this?
    Ayre's T-piece
  48. Image Upload 4
    What is this?
  49. Image Upload 5
    What is this person's finger on?
    vaporizer lock dial
  50. Image Upload 6
    What is this?
    vaporizer dial
  51. Image Upload 7
    What is this?
    vaporizer window
  52. Image Upload 8
    What is this?
  53. Image Upload 9
    What is this?
    non-precision vaporizer
  54. Image Upload 10
    What is this?
    non-precision vaporizer wick
  55. Image Upload 11
    What is this?
  56. Image Upload 12
    What is this?
    vaporizer fill inlet
Card Set
Equipment 2 Breath Systems
Clinical Practice