Question: A 42 year old obese male is referred for excessive daytime sleepiness and possible obstructive sleep apnea. Polysomnogram reveals AHI of 4 but multiple RERAs. What defines a RERA?

a) Reduction in airflow by 30%

b) Sequence of breaths over at least 10 seconds with increasing effort that leads to arousal

c) Arousal caused by cessation of airflow

d) Reduction of airflow by at least 30% with a 4% or greater oxyhemoglobin desaturation

[Answer will be posted with next week's new question]

Answer to last week's question, "Old Dog, New Tricks?" (February 4, 2019)

A - no difference in speech perception outcomes.