What does hypopnea refer to in sleep studies?

Hypopnea refers to a condition characterized by a reduction in airflow during sleep, typically leading to a decrease in blood oxygen saturation levels. In sleep studies, it is identified when there is a partial blockage of the airway, which results in diminished airflow and can cause drops in oxygen levels. This can manifest as shallow or weakened breathing, impacting the overall quality of sleep and leading to various complications if not addressed.

While an increase in airflow, total cessation of breathing, or brief awakenings during sleep are related to sleep-disordered breathing, they do not accurately define the specific characteristics associated with hypopnea.