Respiratory Therapy Equipment Flashcards
Beer-Lambert Law
The concentration of an absorbing substance in a solution is related to the intensity of light transmitted through that solution
Reference points
PaO2 80 mmHg = about 95% SaO2
PaO2 50 mmHg = about 80% SaO2
Normal PaO2 80-100 mmHg
What effect might hypoperfusion or COHb have on pulse ox?
may overestimate it
What should be considered when interprating the pulse ox of a patient with anemia?
For any given saturation the PaO2 is lower then normal
If a patient has multiple inhalers which one should be administered first?
bronchodilator
General indications for long-term O2 therapy
PaO2 <88%
What two factors does the inspired O2 concentration with a nasal cannula depend on?
the flow rate through the cannula and the patient’s tidal volume.
If you increase the O2 flow rate by 1L/min what is the increase of FIO2?
4%
Patient populations who would benefit from Venturi Mask
patient who retain carbon dioxide and patients who have moderate to severe hypoxemia
How much O2 does a non-rebreather mask supply?
up to 90% oxygen. Need flow rates of 8-10 L/min
T/F A non-rebreather mask should be used for the seriously ill who require high 02 content or
to avoid tracheal intubation if acute intervention produces a rapid change
True
Pathophysiology of parenchymal lung injury due to oxygen toxicity
secondary to the production of oxygen free radicals that result in tissue destruction
Name two potential adverse effects of supplemental O2
absorptive atelectasis and extrapulmonary toxicity
What happens to patients with chronic compensated respiratory acidosois given supplemental O2?
Accentuation of preexisting hypercapnia
How can you prevent O2 toxicity?
FIO2 < 60% likely safe without toxicities. Aim for a PaO2 60-70 mmHg or SpO2 90-93% with therapies
