Abstract
Upper airway obstruction during sleep occurs more commonly in men than in women and has been treated with progestational agents with some success. Alcohol ingestion exacerbates sleep apnea, and recent studies have established that alcohol depresses the respiratory motor activity to upper airway muscles more than that to the diaphragm, a response pattern that favors upper airway obstruction during inspiration. To investigate the possibility that progesterone provides some protection from this action of alcohol, we studied the responses of phrenic and hypoglossal nerve activities to alcohol infusion in decerebrate cats pretreated with medroxyprogesterone acetate (MPA) or with control injections. The results indicate that pretreatment with MPA reduces the alcohol-induced mismatching of hypoglossal and phrenic activities. This action of MPA may contribute to its effectiveness in the treatment of some patients with inspiratory obstruction during sleep.
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