The rationale behind the use of supplemental oxygen in the treatment of sleep apnea is to:
a. preoxygenate the airway prior to the apneic episodes.
b. stimulate the central chemoreceptors and prevent apneic episodes.
c. increase the respiratory drive in the medulla.
d. blow off carbon dioxide in the alveolus.
A
Because of the hypoxemia-related cardiopulmonary complications of sleep apnea (arrhythmias and pulmonary hypertension), nocturnal low-flow oxygen therapy is sometimes used alone to offset or minimize the oxygen desaturation. The reasoning behind the use of nasal oxygen therapy's effectiveness is that the airway is continually "flooded" with oxygen, which will be inspired during the nonapneic episodes—in effect, "preoxygenating" the patient in anticipation of the apnea events. Usually, no improvement in sleep fragmentation or hypersomnolence occurs with the use of supplemental oxygen.
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