The WatchPAT Advantage of Using Sleep Time vs. Study Time The amount of time actually spent sleeping is essential for determining the Respiratory Disturbance Index, or RDI. Most ambulatory home testing devices lack “real sleep” monitoring and are only able to calculate “total study time”—how long the monitor was actually used. The RDI is then calculated by dividing the total number of respiratory events by a substantially longer time period, thus providing a lower RDI than the actual one. WatchPAT detects the sleep/wake state and REM sleep stage along with “total sleep time,” providing the most accurate estimation of sleep architecture. |
