Abstract
PURPOSE: The use of nasal pressure as the sole monitor for airflow during polysomnography may overestimate disease, especially in mouth breathers. Remote infra-red imaging (IR-I) provides a non-contact method to monitor airflow. Using an infra-red camera placed eight feet from subjects and mathematical modeling, the heat signal from expired air is converted to a signal constituting an airflow channel and is integrated into the existing polysomnographic software as a separate channel. We evaluated the efficacy of IR-I as an alternative airflow channel during polysomnography in comparison with the conventional methods of nasal pressure, nasal-oral thermistors and capnography.
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