Background: This study examines the validation of a portable device using peripheral arterial tonometry (PAT) as a measurement of SDB in patients with heart failure especially in patients with chronic heart failure (CHF). A high prevalence (about 70%) of SDB in patients with heart failure is known. While 36% of CHF-patients are suffering from obstructive sleep apnea (OSA), 40% are diagnosed with central sleep apnea (CSA).
Patients and Methods: For validation of the PAT device 20 patients with CHF are investigated. PAT measurements are additionally performed within a scheduled polysomnographic examination (PSG). PAT recording is used in diagnostic night and therapeutic night. Data of both measurements (PSG and PAT) will be analyzed and compared in reference to specific types of SDB. Thus, it shall be shown that PAT can detect therapy evoked changes in apnea-hypopnea-index (AHI), oxygen-desaturation-index (ODI) and oxygen saturations.
Results: At this point 11 patients with CHF are examined. All of them are diagnosed with SDB, detected by both PSG and PAT. In particular, seven patients had primarily OSA, while four patients had primarily shown CSA. This was only detected by PSG.
Discussion: So far it seems likely that PAT examination can detect SDB in patients with CHF, but it is not able to distinguish between OSA and CSA. Furthermore it shall be investigated if accurate detection of SDB by PAT depends on type of CHF (heart failure with reduced ejection fraction = HFREF versus heart failure with preserved ejection fraction = HFPEF). Additionally, it shall be analyzed if haemodynamic changes under therapy can be seen in PAT's raw data.