How many mixed apneas were recorded?

How many mixed apneas were recorded?

• A. 4
• B. 2
• C. 14
• D. 16

Answer: (A)

Mixed apneas are events that begin with no respiratory effort (central pattern) and then develop respiratory effort while the airflow remains blocked, creating a single event that contains both central and obstructive features. To identify them, you look at both the airflow signal and the effort signals (thoracic and abdominal belts) and confirm that the episode starts with absent effort for at least part of the time, then shows renewed effort while flow stays suppressed, lasting at least 10 seconds. In the recording referenced, four such transitions were observed, so four mixed apneas were recorded. Other events without this central-to-obstructive transition would be categorized as purely central or purely obstructive and are not counted as mixed.

Mixed apneas are events that begin with no respiratory effort (central pattern) and then develop respiratory effort while the airflow remains blocked, creating a single event that contains both central and obstructive features. To identify them, you look at both the airflow signal and the effort signals (thoracic and abdominal belts) and confirm that the episode starts with absent effort for at least part of the time, then shows renewed effort while flow stays suppressed, lasting at least 10 seconds. In the recording referenced, four such transitions were observed, so four mixed apneas were recorded. Other events without this central-to-obstructive transition would be categorized as purely central or purely obstructive and are not counted as mixed.