Among the listed respiratory events in the dataset, which occurred the fewest times?

Among the listed respiratory events in the dataset, which occurred the fewest times?

• A. 4 mixed apneas
• B. 14 obstructive apneas
• C. 2 central apneas
• D. 16 hypopneas

Answer: (C)

Counting how often each respiratory event appears in the dataset shows central apneas appear two times, which is the smallest count. The other events occur more frequently: mixed apneas four times, obstructive apneas fourteen times, and hypopneas sixteen times. So central apneas happened the fewest times. Central apneas are periods with no respiratory effort during the event, whereas obstructive apneas include continued effort with blocked airflow, hypopneas are partial reductions in airflow with possible desaturation, and mixed apneas involve a combination of central and obstructive features.

Counting how often each respiratory event appears in the dataset shows central apneas appear two times, which is the smallest count. The other events occur more frequently: mixed apneas four times, obstructive apneas fourteen times, and hypopneas sixteen times. So central apneas happened the fewest times. Central apneas are periods with no respiratory effort during the event, whereas obstructive apneas include continued effort with blocked airflow, hypopneas are partial reductions in airflow with possible desaturation, and mixed apneas involve a combination of central and obstructive features.