Obstructive sleep apnea (OSA) is caused by a blockage of the airway, usually when the soft tissue in the rear of the throat collapses and closes during sleep. In central sleep apnea, the airway is not actually blocked; however the brain fails to signal the muscles to breathe. Mixed apnea, as the name implies, is a combination of the other two. With each apnea event, the brain briefly arouses the person with sleep apnea in order for them to resume breathing, but accordingly sleep is extremely fragmented and of very poor quality.
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