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35 Cards in this Set
- Front
- Back
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humidity definition |
water present in a gas mixture are a vapor (molecular water) |
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aerosol definition can bacterial transportation occur? |
water present in a gas mixture as a particle (produced by nebulizer) yes |
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why does no bacterial contamination occur with humidity? |
the extremely small size of the water molecules |
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ciliary activity is impaired when the %BH falls below |
70% |
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ciliary activity ceases when the %BH falls below |
30% |
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signs of humidity deficit (7) |
dry, hacking nonproductive cough inspissated (dry, cakey) secretions earache sore throat substernal pain dryness of skin unstable control of body fluids |
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normal pulmonary fluid loss |
~250-300 ml/day |
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pulmonary fluid loss with pulmonary disease |
~1000 -2000 ml/day |
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situations requiring humidification (6) |
administration of medical gases any artificial airway that bypasses the normal anatomic route for humidification treatment of thick secretions helps maintain body temperature of neonates assist in the re-warming process of hypothermic patients |
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relative hazards to the addition of humidity (3) |
(heated) may increase body temperature beyond desired levels (neonates/elders)
addition of excessive water to cardiovascular system patient may not be able to mobilize secretions |
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humidifier produces water in the _____ form, through the process of what? what does it result in? |
vapor evaporation decrease temperature of water in an unheated humidifier |
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low fluid humidifiers used at flows of |
< 10 L/min |
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low flow humidifiers deliver what% of body humidity? |
30-40% |
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what is the high pressure pop off of a bubble humidifier? |
2 psi (audible whistle) |
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the reservoir amount of water influences what? |
contact time |
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flow meter connection |
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outlet to oxygen delivery devices |
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high pressure pop off |
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water resevoir |
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jet |
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diffuser |
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diffuser produces |
smaller bubbles to increase surface area |
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high flow humidifiers release about what percentage RH at what temperature? |
~100% RH at near body temperature |
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high flow humidifiers have what kind of monitoring of temperature |
continuous |
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high flow humidifiers have infrequent equipment changes due to |
increase temperature decrease in molecule size |
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high flow humidifiers may be used with a variety of patient interfaces such as |
ventilators oxygen hoods aerosol trach face tent masks T-pieces |
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passover humidifier function gas flows over what? increases what? |
heated water increase temperature and RH% |
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passover humidifiers produce what? |
molecular water vapor |
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passover humidifers are or are not changed at regular intervals |
are not |
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what does HME stand for? |
heat/moisture exchanger |
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heat/moisture exchangers are also known as
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hygroscopic condenser humidifier (HCH) artificial nose |
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passive humidifiers use paper, wool, foam treated with hygroscopic salt to what? |
increase thermal conductivity increase temperature and RH% |
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situations when HME (heat moisture exchanger) is used |
transport emergency department (ED) post anesthesia recovery unity (PACU) surgery mechanical ventilation uncomplicated by excessive or abnormally thick pulmonary secretions |
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contraindictions of HME (heat/moisture exchanger) |
increased sputum production very large or very small tidal volumes anytime Raw is a concern |
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hazards of HME (heat/moisture exchanger) |
increased Raw as element becomes excessively saturated with water secretions on element may increase Raw or occlude device excessive mechanical dead space |
