Chapter 39 - Humidity and Bland Aersol Therapy Flashcards
What does the acronym ISB stand for?
Isothermic saturation boundary
Where is the ISB located?
5 cm below the carina
What can cause the ISB to shift distally?
-Person breathes cold dry air
- Airway is bypassed
- Minute ventilation is higher than normal.
What is the formula to find relatively humidity?
(Absolute humidity/ Carrying capacity ) x 100
What is the absoulte humidity at 37 degrees.
44 mg/L
What are the signs and symptoms that the patient needs humidification?
Atelectasis, Dry, non productive cough, Increased airway resistance , increased incidence of infections, increased work of breathing, patient complains of substernal pain and dryness. Thick, dehydrated secretions.
What are the 3 physical principles governing humidifier function?
Temperature, Surface area, Time of Contact (how long the air spends in contact with the water)
What type of breathing device can we use a bubble device for?
Only for nasal cannulas
What are the two catgories of humidfiers?
Active and Passive.
What is the only passive humidifer used in respiratory treatment?
HME (Heat moisture exhange). They have to trap 70% or more of heat and moisture to be efficent.
List all active humidifiers?
Bubble. passover, nebulizers of bland aerosols and vaporizers
What is a passover humidifier?
An active humidifier that directs gas over the water surface. 3 types passover, wick type, membrane type.
What are the advantages of a passover humidifer compared to a bubble humidifier?
- Maintains saturation at high flow rates.
- Add little or no flow resitance to spontaneos breathing circuits.
- Do not generate any aersols that can spread infection.
What is the other name for Heat Mositure Exchangers?
Artificial nose.
What is a simple consdenser humdifiers.
Contains a condenser element with high thermal conductivity, usually with some form of metal.
What is the hygroscopic condenser humidifiers.
Use items such as paper, foam or wool that can coperate a condensing element and then adding hygroscopic salt to the material
What is a hydrophobic condenser humidifer?
Use a water repllent element with a large surface area deadspace.
How much dead space came HME add?
5ml -90ml
What temperature does the AARC recommend you used to for patients on heated humidifiers
33 degrees celcius
What is can occur to a patients tubing when a heated wire is used to heat the air?
Rain out- Condensation with heated wire circuit.
What is the recommened Acutal humidity for intubated patients?
30mg/L
What is bland aerosol?
liquid particles suspended in gas (oxygen or air)
What are the three types of liquids that can be used in bland aerosols?
Sterlie water, Sterile saline (Hypotonic, Isotonic, Hypertonic- hypertonic solutions are not reccomended and cause irritate the patient)
Bland Aersols.
Provide cool air to the patient.
