Don't hold PAT: watch for and correct oximetry artifact.

This study evaluated the accuracy of the algorithmic SpO2 nadir detection of WatchPAT compared to visual inspection in a real-world setting. SpO2 tracings for 209 consecutive adult WatchPAT recordings were reviewed for SpO2 artifact, with erroneous SpO2 data removed manually. Error rate for SpO2 minima were determined across all studies, and relationships between correct and erroneous studies examined. The overall error rate for SpO2 nadir was 22.5%. Erroneous studies had overall less time spent at SpO2≤88%, higher true SpO2 nadir, lower mean body mass index, and greater artifact time, however, these variables were not associated with the magnitude of discrepancy between manual and algorithmically derived SpO2 minima. These data demonstrate the SpO2 nadir determined by WatchPAT algorithms should not be considered universally accurate. Like other home sleep apnea tests, visual inspection and manual correction of the study data is often required to derive accurate clinical results.