To score an obstructive event, what is required of the SpO2 data?

To score an obstructive event, what is required of the SpO2 data?

• A. 3% or more
• B. 5% or more
• C. 4% or more
• D. No required drop in the SpO2 channel

Answer: (D)

Obstructive events are identified by the presence of reduced or absent airflow with ongoing respiratory effort, lasting at least about 10 seconds. The SpO2 signal does not have to show a desaturation for the event to be scored—the definition relies on the airflow change and the maintained effort. Desaturation is helpful for supporting or classifying hypopneas, but it is not a required criterion for labeling an obstructive event itself.

Obstructive events are identified by the presence of reduced or absent airflow with ongoing respiratory effort, lasting at least about 10 seconds. The SpO2 signal does not have to show a desaturation for the event to be scored—the definition relies on the airflow change and the maintained effort. Desaturation is helpful for supporting or classifying hypopneas, but it is not a required criterion for labeling an obstructive event itself.