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RTH 110 - Unit 10

For short term vent use or transport HME aka ‘ Artificial Nose
For body level humidity Wick, pass over ( Large bore tubing)
For ambient humidification Bubble ( Small bore tubbing)
1.Surface area: The water/ gas interface. The greater the area of contact between water and gas, the more opportunity for evaporation to occur
Contact time The longer the atmosphere is exposed to the water surface, the more moisture can be picked up
3. Temperature Increasing the temperature will increase the amount of water vapor the air can hold.
Gas Flow Usually the efficiency of a humidifier decreases with increases in gas flow ( turbulence, shorter contact time )
Passover humidifier Evaporation occurs as air is “passed over” the water reservoir –Least effective in humidifying an artificial airway unless heated –Typically are disposable, large volume
Warmed humidifier Mainly for patients with bypassed upper airways or those on vent support, AIM at 100% body humidity, used for enclosures with neonates Two types : wick and cascade
What is the typical setting range for heating systems ? 35-37 C
Hazards of condensation Disruption of gas flow Potential alerting of FiO Aspiration risk uColonization of bacteria posing a risk of infection
Best device to achieve body humidity Cascade Heated Humidifier
What are the factors which determine any humidifiers’ out-put (ability to generate ​​​​humidity)? Surface area , contact time, temperature, and gas flow
What are the appropriate equipment choices to use with a bubble style humidifier? Cannula , simple mask, venti-mask and rebreather ( no humidifier)
What is the pressure that would activate the pop off for a simple bubble humidifier? How can we use this to our advantage when checking the patient’s oxygen system? POP OFF releases at 2 psi or 40 mmHg
How often should bubble humidifiers be changed? What information should be labeled on each set up? Containers and bottles should be labeled with date and time and used within 24 hours of opening
Bubble humidifiers restore what percent of relative humidity? 40-50%
Humidity therapy hazards Alterations of heat/water exchange , infection , electrical,
Methods to minimize infection Sterile replacements every 24 hrs uClose-feed reservoirs uPre-packaged sterile disposable units uDrain condensate AWAY from reservoir
How can condensation be minimized ? Place water traps at low points in circuits, use heated wire circuits
Continuous feed system Does not need to be manually refilled or constantly montitored
Reservoir feed system Has to be constantly monitord and manually refilled
Created by: BCJohns