when inspired air is fully saturated (100%) at 37' C, it holds ____ gas and exert a water vapor pressure of ____ mmHg
44
47
amount of water in a given volume of gas
absolute humidity
ratio btwn the amt of water in a given vol of gas and the maximum amt it is capable of holding at that temperature
relative humidity
relative humidity formula
absolute humidity capacity X 100
in percent
body humidity formula
absolute humidity / 44 mg/L x 100
in percent
humidity deficit formula
44 mg/L - absolute humidity
gas being delivered to a pt with an ETT or tracheostomy tube that contains less than 44 mg h20 per liter of gas or water vapor pressure of less than 47 mm Hg tends to?
dry secretions, making them thicker and more difficult to mobilize
2 types of nonheated humidifer
pass-over
bubble
pass-over humidifier provides a body huidity of
25%
bubble humidifier provides a body humidity of
35-40%
what is the most common type of humidifier used with oxygen delivery devices
bubble
2 types of heated humidifier that delivers 100% body humidity
wick
cascade
most nonheated humidifiers have a pressure pop off valve set at
2 psi
tubing of the 02 delivery device should be kinked to obstruct flow, if the pop off SOUNDS, then there are
no leaks
if no sound is heard on the pop off valve, then all connections as well as the humidifier top should be
tightened
water levels of all humidifiers should be maintained at the levels marked on the humidifier jar to ensure
max humidity output
warm moist areas, such as heated humidifiers are a breeding ground for microorganisms especially to what type of species
pseudomonas
humidifier should be replaced every
24 hours
jet nebulizers are a more likely source of what type of infections
nosocomial
HME is used for temp humidification during pt
transport
long term ventilator
clinical use for aerosol therapy
laryngotracheobronchitis LTB
administer meds via HHN or USN
upper airway edema
hydrate pt with tracheostomy
induce cough
types of pneumatic nebulizers
jet
hydrosphere-babington
svn
MDI should be activated just
after you start inhaling
types of electric nebulizers
impeller
ultrasonic
what is the piece that produces a high frequency vibration on the USN
piezoelectric transducer
which neb is the best choice for pts with thick, retained sputum or when sputum induction is necessary for lab cultures
USN
what is the cause if neb is not producing adequate mist