Khayat et al (Khayat RN, et al. Journal of cardiac failure 2009, 15(9):739-746) demonstrates stability of SAS 6 weeks after an episode of decompensation. In this study 395 patients with AHF were included with a mean LVEF of 33%, 75% (298) had a SAS with 57% as obstructive and 18% as central SAS (ref). 100% of patients diagnosed with an obstructive SAS during the decompensation phase remained with it 6 weeks later. For central SAS and on the 12 patients with two polygraphies, 4 were reported to change type of SAS which become obstructive.