IEEE J Biomed Health Inform - Detection of respiratory arousals using photoplethysmography (PPG) signal in sleep apnea patients.

Tópicos

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Resumo

Respiratory events during sleep induce cortical arousals and manifest changes in autonomic markers in sleep disorder breathing (SDB). Finger photoplethysmography (PPG) has been shown to be a reliable method of determining sympathetic activation. We hypothesize that changes in PPG signals are sufficient to predict the occurrence of respiratory-event-related cortical arousal. In this study, we develop a respiratory arousal detection model in SDB subjects by using PPG features. PPG signals from 10 SDB subjects (9 male, 1 female) with age range 43-75 years were used in this study. Time domain features of PPG signals, such as 1) PWA--pulse wave amplitude, 2) PPI--peak-to-peak interval, and 3) Area--area under peak, were used to detect arousal events. In this study, PWA and Area have shown better performance (higher accuracy and lower false rate) compared to PPI features. After investigating possible groupings of these features, combination of PWA and Area (PWA + Area) was shown to provide better accuracy with a lower false detection rate in arousal detection. PPG-based arousal indexes agreed well across a wide range of decision thresholds, resulting in a receiver operating characteristic with an area under the curve of 0.91. For the decision threshold (PC(thresh) = 25%) chosen for the final analyses, a sensitivity of 68.1% and a specificity of 95.2% were obtained. The results showed an accuracy of 84.68%, 85.15%, 86.93%, and 50.79% with a false rate of 21.80%, 55.41%, 64.78%, and 50.79% at PC(thresh) = 25% or PPI, PWA, Area , and PWA + Area features, respectively. This indicates that combining PWA and Area features reduced the false positive rate without much affecting the sensitivity of the arousal detection system. In conclusion, the PPG-based respiratory arousal detection model is a simple and promising alternative to the conventional electroencephalogram (EEG)-based respiratory arousal detection system.

Resumo Limpo

respiratori event sleep induc cortic arous manifest chang autonom marker sleep disord breath sdb finger photoplethysmographi ppg shown reliabl method determin sympathet activ hypothes chang ppg signal suffici predict occurr respiratoryeventrel cortic arous studi develop respiratori arous detect model sdb subject use ppg featur ppg signal sdb subject male femal age rang year use studi time domain featur ppg signal pwapuls wave amplitud ppipeaktopeak interv areaarea peak use detect arous event studi pwa area shown better perform higher accuraci lower fals rate compar ppi featur investig possibl group featur combin pwa area pwa area shown provid better accuraci lower fals detect rate arous detect ppgbase arous index agre well across wide rang decis threshold result receiv oper characterist area curv decis threshold pcthresh chosen final analys sensit specif obtain result show accuraci fals rate pcthresh ppi pwa area pwa area featur respect indic combin pwa area featur reduc fals posit rate without much affect sensit arous detect system conclus ppgbase respiratori arous detect model simpl promis altern convent electroencephalogram eegbas respiratori arous detect system

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