Classification of Penetration--Aspiration Versus Healthy Swallows Using Dual-Axis Swallowing Accelerometry Signals in Dysphagic Subjects

• Published in: IEEE transactions on biomedical engineering Vol. 60; no. 7; pp. 1859 - 1866
• Main Authors: Sejdic, Ervin, Steele, Catriona M., Chau, Tom
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.07.2013; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acceleration; Accelerometry - methods; Accuracy; Algorithms; Barium; Bayes classification; Classification; Deglutition; Deglutition Disorders - diagnosis; Deglutition Disorders - physiopathology; Diagnosis, Computer-Assisted - methods; Discrete wavelet transforms; Discriminant analysis; dual-axis swallowing accelerometry signals; Humans; linear discriminant analysis (LDA); Liquids; Numerical analysis; Pattern Recognition, Automated - methods; Reproducibility of Results; Sensitivity and Specificity; Studies; Vectors; Wavelet Analysis; Wavelet packets; wavelet transformation
• ISSN: 0018-9294; 1558-2531; 1558-2531
• DOI: 10.1109/TBME.2013.2243730

Swallowing accelerometry is a promising noninvasive approach for the detection of swallowing difficulties. In this paper, we propose an approach for classification of swallowing accelerometry recordings containing either healthy swallows or penetration-aspiration (entry of material into the airway) in dysphagic patients. The proposed algorithm is based on the wavelet packet decomposition of swallowing accelerometry signals in combination with linear discriminant analysis as a feature reduction method and Bayes classification. The proposed algorithm was tested using swallowing accelerometry signals collected from 40 patients during the regularly scheduled videoflouroscopy exam. The participants were instructed to swallow several 5-mL sips of thin liquid barium in a head neutral position. The results of our numerical analysis showed that the proposed algorithm can differentiate healthy swallows from aspiration swallows with an accuracy greater than 90%. These results position swallowing accelerometry as a valid approach for the detection of swallowing difficulties, particularly penetration-aspiration in patients suspected of dysphagia.