0562 The characteristics of the older continuous positive airway pressure (CPAP) users in Japan: In comparison with the adult users

Abstract Introduction The characteristics of the older CPAP users have not been well studied, and accessibility to medical care and long-term follow up are the issues about their investigation of the older OSA patients. In this respect, Japan is in a unique position to look into reality of the situation, as virtually all the people have unlimited access to medical care and CPAP follow-up with one to three month interval is mandatory. Under this condition, the aim of this study is to reveal the characteristics of the older CPAP users compared to the adult users. Methods This is a retrospective study dealing with 340 obstructive sleep apnea patients who started CPAP therapy from May 2013 to Oct 2021 in our sleep laboratory. Two groups of CPAP users were extracted from these patients, older (n=44, with the age of 70 years or more, 75.8±4.4 years) and adult (n=26, with the age of 25-44 years old, 39.2±4.5 years) patients. We assessed the characteristics of demographic data, symptoms and comorbidity, diagnostic polysomnographic parameters, and CPAP adherence. Results The older CPAP users were leaner (BMI, older/adult, 24.9 [21.9-26.8]/31.3 [27.1-34.8], p< 0.0001) and less sleepy (Epworth Sleepiness Scale, older/adult, 8.0 [5.0-13.0]/15.5 [8.8-20.2], p< 0.0005). Apnea-hypopnea index (AHI) of two groups were not significantly different (older/adult, 38.6 [27.4-48.0]/49.5 [26.4-66.4]). Most of both older and adult patients continued to use CPAP more than one year (84.1 % and 92.3 %, respectively). CPAP adherence using more than one year in the older group was higher than that in the adult group (older/adult, 96.5 %/80.0 %). Conclusion Our study revealed that CPAP adherence in the older users was higher than that in the adult users, although the older CPAP users were leaner and less sleepy. Support (if any)