Subband DFT—part II: accuracy, complexity and applications
Signal Processing
Expert Systems with Applications: An International Journal
Identification of patients with congestive heart failure using different neural networks approaches
Technology and Health Care
Identification of patients with congestive heart failure using different neural networks approaches
Technology and Health Care
Determination of a New VLF Band in HRV for Ventricular Tachyarrhythmia Patients
Journal of Medical Systems
Relevance analysis of stochastic biosignals for identification of pathologies
EURASIP Journal on Advances in Signal Processing - Special issue on biologically inspired signal processing: analyses, algorithms and applications
Journal of Medical Systems
Digital Signal Processing
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A new method for screening of obstructive sleep apnea (OSA) is investigated. This method is based on the estimation of the energy distribution of the R-R interval (RRI) signals in the time domain. The novelty of the technique arises from the implementation of the soft-decision algorithm of subband decomposition. This soft-decision algorithm will help in finding the ratio of energy (power spectral density (PSD)) in the different frequency bands of the RRI spectrum without implementing any transform technique. Two different ratios--low-frequency/very low-frequency (LF/VLF) and low-frequency/high-frequency (LF/HF)--are used for screening normal and apnea cases. The algorithm can be implemented directly on the (RRI) raw-data or after some pre-processing and filtering steps. The training data used in this study are drawn from the MIT-trial database, while the test data are drawn from the MIT-challenge (chal) database as well as from the sleep disorders laboratory of Sultan Qaboos University (SQU) hospital. Threshold values to identify normal and OSA cases are selected using the receiver operating characteristics (ROC) on the training data. These threshold values are then used for the screening of the test data. The best classification accuracy obtained with the test data (MIT-chal and SQU data) approaches 93% using the LF/VLF ratio. In this case, the sensitivities obtained with MIT-chal and SQU data are 95% and 100%, respectively, while the specificities are 90% and 86% for the same two groups of data.