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The ability to detect central apneas is a useful addition to an automatic algorithm for the treatment of OSA. The ResMed AutoSet algorithm has recently been enhanced to include a Central Sleep Apnea Detector (CSAD). This paper describes the CSAD as part of the enhanced AutoSet algorithm on the S9 flow generator and documents the process of validation which included early human testing, bench testing and clinical trial results. The enhanced AutoSet algorithm and CSAD showed that it identified and appropriately treated the different types of apneas with a very high degree of accuracy leading to better overall therapy.