Registered Polysomnographic Technologist Practice Exam

Obstructive apnea is characterized by the absence of airflow while there is ongoing respiratory effort. During this type of apnea, the muscles involved in breathing attempt to work, but they encounter a blockage in the upper airway, preventing air from reaching the lungs. This blockage may be due to various factors, such as excessive tissue in the throat, leading to a collapse of the airway during sleep. The presence of respiratory effort alongside the lack of airflow is a defining feature that differentiates obstructive apnea from other types.

In contrast, central apnea occurs when the brain fails to send signals to the muscles that control breathing, leading to a lack of respiratory effort and airflow. Mixed apnea is a combination of both obstructive and central apnea, where periods of both types can occur during a sleep episode. Complex apnea is not a widely recognized term in clinical practice and might refer to a situation where both central and obstructive events are present but is typically less standard in classification. Understanding these distinctions can help in diagnosing and managing sleep apnea accurately.