The assumption that the severity of SAS increases during AHF has been questioned recently by some studies. These studies suggest that the prevalence of SAS and type are similar in the acute decompensated phase or after stabilization of HF regarding SAS severity and type. Interestingly, in the study conducted at Padeletti, including 10 patients who underwent polysomnography control just before or immediately after discharge from the hospital, all measured parameters remained stable overall. Padeletti M, et al. Sleep medicine 2009, 10(3):353-360).