If you increase the oxygen input flow to a 28% air-entrainment mask from 5 to 7 L/min, what will be the oxygen concentration?

You must deliver the highest possible FIO2 to a 67-year-old man with pulmonary edema breathing at a rate of 24/min. Which of the following O2 delivery systems would be most appropriate?

A patient with COPD and hypercapnia is receiving oxygen via 35% venturi mask. He is      becoming increasingly somnolent, and an arterial blood gas analysis has been requested. The most appropriate immediate action would be to change to:

A patient is currently on oxygen via oxygen simple mask at 12 LPM. The patient is breathing at a rate of 30 breaths/min, SpO2 at 87% and has bilateral rhonchi on auscultation. What should the therapist do next?

When checking a patient’s intermittent positive-pressure breathing (IPPB) breathing circuit before use, you notice that the device will not cycle off, even when you occlude the mouthpiece. What would be the most appropriate action in this case? 

A patient needs to be transported to the OR and a therapist obtains a oxygen E tank with 1300 psi. The patient is on oxygen via simple O2 mask at 10 LPM. How long will the tank last?

A patient has a pH of 7.58 and a PaCO2 of 50 torr. Based on these data, what is the primaryacid-base disturbance?

To measure PCO2, blood gas analyzers use what electrode? 

Identify the rhythm?

How long will an “H” cylinder last that has 1900 psig if 02 flow is 7 lpm?