What are the key characteristics of obstructive sleep apnea (OSA) as described in the chapter?

Key characteristics of obstructive sleep apnea (OSA) include partial or complete upper airway obstruction during sleep, leading to episodes of apnea (cessation of airflow) and hypopnea (shallow breathing). These episodes can result in decreased oxygen levels and frequent arousals, often accompanied by loud snoring and excessive daytime sleepiness. Risk factors for OSA include obesity, older age, and specific anatomical features.

Obstructive sleep apnea (OSA) is characterized by interruptions in breathing during sleep due to upper airway obstruction. This condition manifests as apnea, defined as a cessation of airflow for more than 10 seconds, and hypopnea, which involves a significant reduction in airflow. These events can lead to hypoxemia and hypercapnia, causing the patient to experience frequent arousals throughout the night. Common symptoms include loud snoring, excessive daytime sleepiness, and morning headaches. Risk factors for developing OSA include obesity, age over 65, and certain craniofacial abnormalities.