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Test bank For Respiratory Care Exam Review 9th Edition by Al Heuer
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Test bank For Respiratory Care ExamReview 9th Edition by Al Heuer
The respiratory therapist receives an order to set up a moderate level of oxygen on a patient
who arrives in the ED breathing at a rate of 35 BPM. Which of the following is most appropriate
to use?
1. Simple O2 mask at 10 LPM
2. Nasal cannula at 4 LPM
3. Nonrebreathing mask at 15 LPM
4. Air-entrainment mask at 40% O2 - Simple mask at 10 LPM
The physician has ordered oxygen to be set up on a patient who has a spontaneous tidal
volume of 500 mL and an inspiratory time of 1 second. Which of the following devices will
deliver a flow that meets or exceeds this patient's inspiratory flow?
1. 35% air entrainment mask at 6 LPM
2. 60% aerosol mask at 12 LPM
3. NRB at 15 LPM
4. Simple O2 mask at 10 LPM - 35% air entrainment mask at 6 LPM
Use inspiratory flow equation: flow rate = L/t
0.5 L/1 second = 0.5 LPS
0.5 x 60 = 30 LPM at least must be delivered
Find air/O2 ratio:
100-35=65
35-21=14
65/14 = 4.64, so ratio is 5:1
5+1 = 6 x 6LPM = 36 LPM delivered by the air entrainment mask
While making oxygen rounds, you discover the 6 inch reservoir tubing on a 60% T-piece set up
has fallen off. What may result from this situation?
1. The FiO2 could decrease
2. The total flow to the patient could increase
3. More room air entrainment could occur - FiO2 decrease and room entrainment can occur
,A patient is using a 30% air entrainment mask at an O2 flow of 5 LPM. What is the total flow
being delivered? - 100-30 = 70
30-21 = 9
70/9 = 7.7, so 8:1
8+1 = 9
9x5 LPM = 45 LPM
Large cylinders use which type of safety system? - ASSS (american standard safety system)
*different number of threads/inch and different thread size
Small cylinders use which type of safety system? - PISS (pin index safety system)
Color of carbon dioxide tank - gray
Color of nitrous oxide tank - light blue
Color of helium tank - brown
color of oxygen tank - green
Duration of cylinder equation - (cylinder pressure x cylinder factor)/flow rate
Cylinder factors for H & E cylinders: - H = 3.14
E = 0.28
Liquid O2 equation - Gas remaining = (Liquid weight (lbs) x 860)/2.5
Duration (minutes) = gas remaining (L)/Flow (LPM)
Indications for this include hypoxemia, labored breathing or dyspnea, and increased myocardial
work - O2 therapy
patients with COPD should maintain a PaO2 between __-__ mmHg - 50-65
High oxygen concentrations in the lung can wash out nitrogen and reduce the production of
what, leading to atelectasis? - surfactant
If a normal PaO2 level cannot be maintained with a 60% O2 mask, a large shunt is probable
and ____ should be administered if CO2 is normal - CPAP
Normal PaO2 for infants - 50-70 mmHg
, When given a patient using 60% O2 or higher who has a normal or low PaCO2 but has
hypoxemia, place the patient on _____
(unless they have hypotension, low CO, or increased ICP - increase FiO2 in these cases) -
CPAP
What is the most effective measurement to determining the O2 carrying capacity of a patient's
blood - CaO2
May cause anemic hypoxia, most commonly caused by nitrite poisoning. Treat by administering
ascorbic acid or methylene blue - Methemoglobin
CaO2 equation - (1.24 x Hgb x SpO2) + (0.003 x PaO2)
an o2 delivery device that does not meet the patient's inspiratory flow demands; therefore room
air must make up the remainder of the patient's tidal volume. Not used for inconsistent
ventilatory patterns. - Low flow O2 system
Dlivers 35-50% O2 at flow rates of 5-10 LPM, Flow of 5 is required to prevent Co2 buildup in the
mask - Simple mask
Delivers 40-70% O2 at flow rates of 10-15 LPM - Partial rebreathing mask
Delivers 60-80% O2 at flow rates of 10-15 LPM - NRB
What are the low flow delivery devices? - 5
(regular ventilatory pattern, RR less than 25, Consistent Vt or 300-700) - 1. Transtracheal
catheter
2. Nasal cannula
3. Simple O2 mask
4. Partial rebreathing mask
5. Nonrebreathing mask
Increasing the flow rate on high flow devices will or will not increase FiO2? - will not
What are the high flow o2 devices? - 6 - 1. Air entrainment mask
2. Aerosol mask
3. Face tent
4. T piece/Briggs adaptor
5. Trach collar
6. High flow cannula
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