Variability in Nocturnal Oxygen Parameters in Suspected Obstructive Sleep Apnea (OSA) (VARIOUS)

The investigators would like to evaluate the variability of oxygen (and PPG) parameters during 7 nights at home. Oxygen (and PPG) parameters will also be evaluated during 1 night at the hospital (diagnostic polysomnography). Based on currently developed algorithms, surrogate apnea-hypopnea index (AHI), cardiovascular status and the variability of these parameters will be evaluated.

The main objective of this trial is to evaluate the variability in nocturnal oxygen (and PPG) parameters during 7 consecutive nights at home and to identify clinical predictors of variability in patients with suspected OSA. Data regarding sleep position, alcohol intake and sleep duration will be evaluated (these parameters could be important to explain variability). Additional objectives are to compare the parameters measured at home with the parameters measured during an in-hospital polysomnography. The investigators will also evaluate variability in the surrogate AHI described by the group based on the measurements at home and the impact of multi-night evaluation of oxygen (and PPG) parameters on the recently developed mICS algorithm will be explored. This study is a first explorative approach for further (multi-site) work to define the burden of OSA associated with cardiovascular or psychofunctional problems.

A CE medical approved polygraphy device (Dreamscan 2 - Medatec) will be used to obtain oximetry (and PPG) data

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in number of oxygen desaturation events with desaturation higher or equal to 3% is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in number of oxygen desaturation events with desaturation higher or equal to 4% is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in mean nocturnal oxygen saturation during 7 consecutive nights at home is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in mean nocturnal oxygen saturation during 7 consecutive nights at home is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in mean nocturnal oxygen saturation during 7 consecutive nights at home is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in mean nocturnal oxygen saturation during 7 consecutive nights at home is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Using a CE medical approved polygraphy device (Dreamscan 2 - Medatec) the variability in mean nocturnal oxygen saturation during 7 consecutive nights at home is evaluated. Mean +/- SD or median (interquartile range) depending whether or not the 7 night data present a Gaussian distribution, and the coefficient of variation (CV).

Based on sleep diaries, the correlation between alcohol intake and/or sleep duration and the variability of nocturnal oxygen parameters is evaluated.

Based on data of the McRoberts Move monitor, the correlation between body position and the variability of nocturnal oxygen parameters is evaluated.

To compare nocturnal oxygen (and PPG) parameters measured at home and during a diagnostic polysomnography in hospital.

Comparison of the different oxygen parameters evaluated during 7 nights at home and during 1 night in the hospital

Based on a previously developed algorithm, based on oximetry (including PPG), a surrogate AHI can be calculated. The variability in the surrogate AHI during 7 nights is evaluated.

Based on a previously developed algorithm, based on oximetry (including PPG), the cardiovascular comorbidity can be estimated. The variability in this algorithm during 7 nights is evaluated.

Inclusion Criteria: Patients with suspected OSA with a clinical indication to perform a polysomnography Exclusion Criteria: Patients younger than 18 yrs Patients not able to read or understand the informed consent content on the purpose of the study, due to visual, intellectual or language issues Patients with neuromuscular disease or chest wall disease with suspected hypoventilation