Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
50 Cards in this Set
- Front
- Back
|
1 liquid litre of oxygen is equal to how many gaseous litres of oxygen?
|
862 gaseous litres of oxygen
|
|
|
1 atmosphere is equal to how many psi?
|
14.7 psi
|
|
|
760 mmHg is equal to how many kilopascals?
|
101.3 kilopascals
|
|
|
What are the three properties of fluid?
|
1) Fluids at rest exert forces in a perpendicular direction
2) Pressures on fluids are transmitted undiminished in all directions 3) The pressure of a fluid is the same at points of equal heights, and the difference in pressures of a fluid between two points is relative to the difference in heights. |
|
|
According to Toricelli, if the area (radius) of a tube is restricted, what will happen to the flow?
|
There will be increased velocity.
|
|
|
According to Bernoulli, as velocity increases at a restriction in the tube, what will happen to the pressure?
|
Pressure will be lower.
|
|
|
A venturi device works by entraining room air as oxygen flows through a restriction. Larger entrainment ports result in...?
|
Lower FiO2 delivery because more room air will be entrained.
|
|
|
A venturi device works by entraining room air as oxygen flows through a restriction. Smaller entrainment ports result in...?
|
Higher FiO2 delivery because more room air will be entrained.
|
|
|
A venturi device works by entraining room air as oxygen flows through a restriction. A small change in the radius of the tube results in...?
|
Less change in flow and therefore less drop in pressure so decreased entrainment and therefore greater FiO2
|
|
|
A venturi device works by entraining room air as oxygen flows through a restriction. A large change in the radius of the tube results in...?
|
Greater change in flow and therefore a greater drop in pressure so increased entrainment and therefore lower FiO2
|
|
|
What are the two types of safety relief valves for oxygen cylinders?
|
Frangible disc (large tanks) and fusible plug (smaller tanks).
|
|
|
What is the purpose of cylinder cracking?
|
To remove dust
|
|
|
What is the pressure of oxygen in a full cylinder?
|
2200 psi
|
|
|
How many litres of oxygen in a D-size cylinder, and what is the cylinder factor?
|
359 L, 0.16
|
|
|
How many litres of oxygen in a E-size cylinder, and what is the cylinder factor?
|
622 L, 0.28
|
|
|
How many litres of oxygen in a H-size cylinder, and what is the cylinder factor?
|
6900 L, 3.14
|
|
|
What is the pressure of a full tank of Heliox?
|
2000 psi
|
|
|
How many litres of heliox in a H-size cylinder, and what is the cylinder factor?
|
5590 L, 2.5
|
|
|
How many litres of heliox in a D-size cylinder, and what is the cylinder factor?
|
310 L, 0.14
|
|
|
How many litres of heliox in a E-size cylinder, and what is the cylinder factor?
|
510 L, 0.26
|
|
|
How is the duration of a cylinder calculated?
|
Duration = K x (P - safety margin)/flowrate
|
|
|
Distinguish between primary and secondary valves in wall outlets.
|
Primary - closest to patient, removable from wall.
Secondary - in elbow of unit, will seal and prevent leaks if primary is removed. |
|
|
In a non-backpressure compensated thorpe tube, the needle valve is _____________ from the thorpe tube.
|
Upstream
|
|
|
What is the effect of backpressure in a thorpe tube flowmeter that is not compensated.
|
There is greater pressure above the float, so the indicated flow will be less than actual flow.
|
|
|
In a backpressure compensated thorpe tube, the needle valve is _____________ from the thorpe tube.
|
Downstream
|
|
|
For a 20:80 heliox mixture, how is actual flow calculated when using a flowmeter calibrated for oxygen?
|
Actual flow = 1.8 x measured flow
|
|
|
For a 30:70 heliox mixture, how is actual flow calculated when using a flowmeter calibrated for oxygen?
|
Actual flow = 1.6 x measured flow
|
|
|
For low flow oxygen therapy, are the flow rates provided greater than or less than the patient's inspiratory flow and minute volume?
|
Less than
|
|
|
For high flow oxygen therapy, is the FiO2 variable or fixed?
|
Fixed
|
|
|
How many valves are there in a partial rebreathing mask?
|
0
|
|
|
How many valves are there in a non-rebreathing mask?
|
2
|
|
|
What is the advantage of a conserving cannula?
|
A small amount of oxygen is stored during exhalation and the patient is able to draw on this during the beginning of inspiration, allowing for a lower oxygen flowrate to be used.
|
|
|
What is the minimum flow to be used for a simple mask? Why?
|
5 Lpm. To wash out CO2.
|
|
|
How is a patient's inspiratory flow estimated?
|
3 x MV
|
|
|
How is a patient's inspiratory flow calculated?
|
Vt/Ti x 60
|
|
|
How is the ratio of air to oxygen calculated for a venti mask (<35%)?
|
(100 - desired O2%)/(desired O2% - 21)
|
|
|
What is the entrainment ratio for 50%?
|
2:1
|
|
|
What is the entrainment ratio for 70%?
|
0.6:1
|
|
|
What is the entrainment ratio for 60%?
|
1:1
|
|
|
What is the entrainment ratio for 30%?
|
8:1
|
|
|
What is the entrainment ratio for 24%?
|
25:1
|
|
|
What is the entrainment ratio for 40%?
|
3:1
|
|
|
What is the minimum flow that should be used in an oxyhood?
|
7 Lpm
|
|
|
Why do we humidify gas?
|
1) To accomodate for bypassing the patient's natural humidification
2) Assist in mobilizing secretions |
|
|
How does a passive humidifier work?
|
By using the patients own exhaled vapours to humidify the gas
|
|
|
What are the two types of vapourizers and how are they different?
|
Simple - no heat added
Advanced - heat added |
|
|
A bubbler is what type of humidifier?
|
Active simple diffuser
|
|
|
What benefit does the wick add to a heated passover humidifier?
|
Increases surface area
|
|
|
How does an ultrasonic nebulizer work?
|
It vibrates at a high frequency and converts electricity to sound waves which creates standing waves in the liquid.
|
|
|
What is the isothermic saturation boundary?
|
The point in the airway where inspired gases reach body temeprature and humidity.
|
