21 Questions
What is the most common fluid used in traditional barometers and at the bedside for pressure measurements?
Mercury
Which type of pressure measuring device is rapidly replacing traditional barometers and bedside pressure measurement tools?
Electronic pressure gauge
What type of pressure measuring device uses a flexible chamber and measures pressure electronically?
Strain gauge
What is the purpose of the alarm system in the medical gas blender?
To provide an audible warning when either source gas fails or the pressure decreases below a specified value
What happens if the air supply stops when the blender is set to deliver 60% oxygen?
The alarm will sound, and the system will start giving 100% oxygen to the patient
What is the function of the pressure equalization valves in the gas blender?
To ensure that the gas pressures from the air and O2 inlets are equal before reaching the proportioning valve
What is the recommended range for the inlet gas pressures in most blenders?
Within 10 – 20 psig of each other for the unit to operate properly
What triggers an alarm in the context of gas failure?
Pressure Equalization valves not making the gasses close in pressure
What determines the oxygen percentage leaving the blender?
Position of the proportioning valve within the mixing chamber
What is a disadvantage of high flow oxygen blenders?
Accurate only at higher flows
What is the advantage of oxygen blenders?
Provide precise oxygen concentrations
In what scenario would a proportioning valve not be accurate?
Low flow and no internal leak
What allows a high flow blender to be accurate at both low and high flows?
Internal leak (bleed)
What is a disadvantage of oxygen blenders related to internal leaks?
Wastes more gas
Why do blenders need a minimum amount of flow through the proportioning valve?
To create enough resistance by the proportioning valve
What is a disadvantage of using low flow nasal cannulas?
Unstable and easily dislodged
What is the FiO2 range for low flow nasal cannulas?
22%-40%
Which type of low flow nasal cannula uses tubes that are big?
Pendant reservoir cannula
What is a disadvantage of using low flow nasal cannulas?
They can cause dryness, bleeding, polyps, and deviated septum
When are low flow nasal cannulas best used?
For patients in stable condition who need low FiO2
What type of low flow nasal cannula is inserted into the vestibule of the nose?
Reservoir Cannula
Test your knowledge about mercury barometers with this multiple-choice quiz. Learn about the use of mercury in pressure measurements, its density, and the transition to modern pressure measuring devices.
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