Respiratory effort-related arousal

This event shows a significant decrease in airflow as measured by the nasal pressure transducer, with significant persistent flow. The end of the event (the right side of the blue bracket) is associated with an abrupt increase in electroencephalography (EEG) frequency (the six leads above the respiratory traces), suggesting an arousal. Because the arousal occurs at the end of the subtle decrease in airflow, this event is a respiratory effort-related arousal (RERA). Note that no subsequent change in oxyhemoglobin saturation levels occurs, confirming this to be a significantly more mild decrease in airflow than is seen with a hypopnea.