NDLI: Evaluation of an alternative definition for the apnea-hypopnea index

Content Provider	IEEE Xplore Digital Library
Author	Otero, A. Felix, P. Presedo, J. Zamarron, C.
Copyright Year	2010
Description	Author affiliation: Division of Respiratory Medicine. University Hospital Complex of Santiago de Compostela, Spain (Zamarron, C.) \|\| Department of Information and Communications Systems Engineering, University San Pablo CEU, 28668 Madrid, Spain (Otero, A.) \|\| Department of Electronics and Computer Science, University of Santiago de Compostela, 15782, Spain (Felix, P.; Presedo, J.)
Abstract	The apnea-hypopnea index (AHI) plays a major role in determining whether a patient suffers from SAHS, as well as in evaluating the severity of his/her condition. To obtain this index the number of apneas and hypopneas that the patient has experienced during his/her sleep is calculated, and the result is divided by the number of hours of sleep. The standard definitions of apnea and hypopnea require that these events have a minimum temporal span of 10 seconds. Our experience has taught us that some respiratory airflow limitations lasting less than 10 seconds can produce a noticeable effect on the patient's blood oxyhemoglobin saturation (SpO2). In this paper we propose alternative definitions for apnea and hypopnea events that include respiratory airflow limitations with a temporal span between 5 and 10 seconds when they are associated with a drop in SpO2 of at least 3%. Then we compare the AHI calculated using the standard definition and our definition over a database of 40 polysomnograms. For 2 of the 40 patients, the standard AHI clearly underestimates the severity of the patient's condition, while ours does not.
Starting Page	4654
Ending Page	4657
File Size	788224
Page Count	4
File Format	PDF
ISBN	9781424441235
ISSN	1557170X
DOI	10.1109/IEMBS.2010.5626444
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-31
Publisher Place	Argentina
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Indexes Sleep apnea Blood Medical diagnostic imaging Visualization Computer science Hypopnea Sleep Apnea-Hypopnea Syndrome (SAHS) Apnea-Hypopnea Index Apnea
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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