SleepAp: An Automated Obstructive Sleep Apnoea Screening Application for Smartphones. Behar, J., Roebuck, A., Shahid, M., Daly, J., Hallack, A., Palmius, N., Stradling, J., & Clifford, G., D. IEEE Journal of Biomedical and Health Informatics, 19(1):325-331, 1, 2015.
SleepAp: An Automated Obstructive Sleep Apnoea Screening Application for Smartphones [link]Website  abstract   bibtex   
Obstructive sleep apnoea (OSA) is a sleep disorder with long-term consequences. Long-term effects include sleep-related issues and cardiovascular diseases. OSA is often diagnosed with an overnight sleep test called a polysomnogram. Monitoring can be costly with long wait times for diagnosis. In this paper, a novel OSA screening framework and prototype phone application are introduced. A database of 856 patients that underwent at-home polygraphy was collected. Features were derived from audio, actigraphy, photoplethysmography (PPG), and demographics, and used as the inputs of a support vector machine (SVM) classifier. The SVM was trained on 735 patients and tested on 121 patients. Classification on the test set had an accuracy of up to 92.2% when classifying subjects as having moderate or severe OSA versus being healthy or a snorer based on the clinicians' diagnoses. The signal processing and machine learning algorithms were ported to Java and integrated into the phone application-SleepAp. SleepAp records the body position, audio, actigraphy and PPG signals, and implements the clinically validated STOP-BANG questionnaire. It derives features from the signals and classifies the user as having OSA or not using the SVM trained on the clinical database. The resulting software could provide a new, easy-to-use, low-cost, and widely available modality for OSA screening.
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 title = {SleepAp: An Automated Obstructive Sleep Apnoea Screening Application for Smartphones},
 type = {article},
 year = {2015},
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 keywords = {Actigraphy,Databases,Feature extraction,Informatics,Java,Medical diagnostic imaging,OSA screening framework,PPG,PPG signals,STOP-BANG questionnaire,SVM,Sleep apnea,SleepAp,Smart phones,Support vector machines,actigraphy,at-home polygraphy,audio,automated obstructive sleep apnoea screening appli,body position,cardiovascular diseases,cardiovascular system,clinical database,demographics,diagnosis,diseases,learning (artificial intelligence),mHealth,machine learning algorithms,medical disorders,medical signal processing,obstructive sleep apnoea (OSA),overnight sleep test,phone application,photoplethysmography,polysomnogram,prototype phone application,signal classification,signal processing,sleep,sleep disorder,sleep disorders,smart phones,smartphones,software,subject classification,support vector machine classifier,support vector machines},
 pages = {325-331},
 volume = {19},
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 abstract = {Obstructive sleep apnoea (OSA) is a sleep disorder with long-term consequences. Long-term effects include sleep-related issues and cardiovascular diseases. OSA is often diagnosed with an overnight sleep test called a polysomnogram. Monitoring can be costly with long wait times for diagnosis. In this paper, a novel OSA screening framework and prototype phone application are introduced. A database of 856 patients that underwent at-home polygraphy was collected. Features were derived from audio, actigraphy, photoplethysmography (PPG), and demographics, and used as the inputs of a support vector machine (SVM) classifier. The SVM was trained on 735 patients and tested on 121 patients. Classification on the test set had an accuracy of up to 92.2% when classifying subjects as having moderate or severe OSA versus being healthy or a snorer based on the clinicians' diagnoses. The signal processing and machine learning algorithms were ported to Java and integrated into the phone application-SleepAp. SleepAp records the body position, audio, actigraphy and PPG signals, and implements the clinically validated STOP-BANG questionnaire. It derives features from the signals and classifies the user as having OSA or not using the SVM trained on the clinical database. The resulting software could provide a new, easy-to-use, low-cost, and widely available modality for OSA screening.},
 bibtype = {article},
 author = {Behar, Joachim and Roebuck, Aoife and Shahid, Mohammed and Daly, Jonathan and Hallack, Andre and Palmius, Niclas and Stradling, John and Clifford, Gari D.},
 journal = {IEEE Journal of Biomedical and Health Informatics},
 number = {1}
}

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