The nurse is explaining to a client with cystic fibrosis the goals of the oxygen therapy prescribed for her. Which of the following is a therapeutic effect of oxygen administration?
A) It reverses high and low oxygen concentrations in the blood.
B) It increases the work of the respiratory system, allowing it to work more efficiently.
C) It decreases the heart's work in pumping blood and eases the heart's load.
D) It affects ventilatory drive control mechanisms and increases the stimulus to breathe.
C
Feedback:
Increasing the concentration (or percentage) of oxygen the client inhales accomplishes three goals: (1) it reverses hypoxemia (low oxygen concentration in the blood); (2) it decreases the work of the respiratory system—if the client receives supplemental oxygen, the respiratory muscles do not work as hard to pump air in and out of the lungs to maintain a sufficient blood oxygen supply; and (3) it decreases the heart's work in pumping blood—the heart tries to compensate for hypoxemia by increasing output; supplemental oxygen can ease the heart's load.
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