Structured Testing and Treatment for Obstructive Sleep Apnea in Patients With Atrial Fibrillation
The main goal of this prospective pre-post implementation study is to investigate how a structured testing and treatment program for obstructive sleep apnea using the NOX T3s device and a Fitbit smartwatch with the FibriCheck algorithm impacts the proportion of atrial fibrillation (AF) in an AF population.

Participants will wear the NOX T3s respiratory polygraphy device for one night at home. In case of a positive obstructive sleep apnea diagnosis, patients will be referred to the sleep clinic for a polysomnography examination. Patients positively diagnosed with polygraph will be monitored semi-continuously with the Fitbit smartwatch for three months. After the polysomnography examination, the positively diagnosed patients will be monitored semi-continuously for another three months after initiation of treatment (mostly continuous positive airway pressure (CPAP) treatment). Additionally, patients will be administered satisfaction and symptom burden questionnaires twice: right after the polysomnography examination and after the 3-month treatment.
- EligibilityCriteria: Inclusion Criteria:  Patients in whom AF (paroxysmal or persistent) is diagnosed with a 12-lead ECG Patients who experience symptoms of their AF (mEHRA ≥ 2a) Older than 18 years Owning a smartphone compatible with Fitbit and FibriCheck applications (i.e. recent versions of Apple iOS or Android drivers) Ability to sign the informed consent  Exclusion Criteria:  Patients diagnosed with permanent AF or only atrial flutter Prior/recent polysomnography evaluation Prior/active CPAP/BiPAP/ASV treatment Cognitive impairment Inability to speak or fully understand Dutch Pacemaker-dependent heart rhythm - HealthyVolunteers: No - Gender: All - MinimumAge: 18 Years - StdAgeList: Adult, Older Adult