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Introduction & background: Residual events during CPAP contribute to increase treatment drop-outs. Clinical scenarios triggering residual events during CPAP use are poorly described. Aims & objectives: Underlying comorbidities, especially cardiovascular diseases, lifestyle factors, OSA characteristics at baseline and type of mask are suggested as potential contributors. Methods: Patients from the prospective national French sleep apnea registry with apnea-hypopnea index (AHI) = 15/h and CPAP indication were included. A logistic regression analysis was used to identify factors associated with the probability of exhibiting a residual AHI > 5/h whilst on CPAP. Results: 12,285 OSA patients predominantly men (N=8715, 70.9%), middle aged (median [IQR]: 58.2 [49.8;66.1] years) and obese (median body mass index: 31.3 [27.7;35.6] kg/m²) were included. Most had an AHI=5/h (N=9,573, 77.9%) versus 22.1% exhibited an AHI>5/hour. The latter group was significantly less adherent to CPAP (5.75 [4.01;7.00] vs 6.00 [4.53;7.00] h/night). In multivariable analysis, factors associated with a high residual AHI were male gender, age and sedentary lifestyle, OSA severity, cardiovascular comorbidities and interface (orofacial versus nasal mask: OR = 2.15 [CI: 1.95;2.37]). Conclusions: The knowledge of at-risk clinical scenarios predicting more frequent residual events will help in the timely provision of personalized care including type of PAP therapy, attention to comorbidity care and interfacechoice

Rationale: Both obesity and obstructive sleep apnea (OSA) are risk factors for hypertension (HT) and chronic heart failure (CHF). The association between OSA and COPD (overlap syndrome) and the obesity hypoventilation syndrome (OHS) have been proposed as leading to enhanced cardiovascular risk. Methods: 3093 obese subjects (IMC>30kg/m2) referred for suspicion of OSA were prospectively assessed by sleep studies, lung function tests and blood gazes. For the whole group, mean age was 57±13 years with 66% of men, mean BMI: 36.8±6.2 kg/m2, 52.8% of the subjects being hypertensive and 3.23% suffering from CHF. 926 of the 3093 did not exhibit OSA or COPD. Results: In multivariate analysis, prevalent hypertension was associated with OSA (Odd ratio (OR): 1.23 (confidence intervals (CI): 1.04-1.45), p=0.015), ≥2 nocturia episodes per night (OR: 1.295 (CI: 1.10-1.52), p