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A statistical analysis of cervical auscultation signals from adults with unsafe airway protection

Dudik, JM and Kurosu, A and Coyle, JL and Sejdić, E (2016) A statistical analysis of cervical auscultation signals from adults with unsafe airway protection. Journal of NeuroEngineering and Rehabilitation, 13 (1).

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Background: Aspiration, where food or liquid is allowed to enter the larynx during a swallow, is recognized as the most clinically salient feature of oropharyngeal dysphagia. This event can lead to short-term harm via airway obstruction or more long-term effects such as pneumonia. In order to non-invasively identify this event using high resolution cervical auscultation there is a need to characterize cervical auscultation signals from subjects with dysphagia who aspirate. Methods: In this study, we collected swallowing sound and vibration data from 76 adults (50 men, 26 women, mean age 62) who underwent a routine videofluoroscopy swallowing examination. The analysis was limited to swallows of liquid with either thin (<5 cps) or viscous (≈300 cps) consistency and was divided into those with deep laryngeal penetration or aspiration (unsafe airway protection), and those with either shallow or no laryngeal penetration (safe airway protection), using a standardized scale. After calculating a selection of time, frequency, and time-frequency features for each swallow, the safe and unsafe categories were compared using Wilcoxon rank-sum statistical tests. Results: Our analysis found that few of our chosen features varied in magnitude between safe and unsafe swallows with thin swallows demonstrating no statistical variation. We also supported our past findings with regard to the effects of sex and the presence or absence of stroke on cervical ausculation signals, but noticed certain discrepancies with regards to bolus viscosity. Conclusions: Overall, our results support the necessity of using multiple statistical features concurrently to identify laryngeal penetration of swallowed boluses in future work with high resolution cervical auscultation.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Dudik, JMjmd151@pitt.eduJMD151
Kurosu, Aatk22@pitt.eduATK22
Coyle, JLjcoyle@pitt.eduJCOYLE0000-0002-5627-5623
Sejdić, E
Date: 22 January 2016
Date Type: Publication
Journal or Publication Title: Journal of NeuroEngineering and Rehabilitation
Volume: 13
Number: 1
DOI or Unique Handle: 10.1186/s12984-015-0110-9
Schools and Programs: School of Health and Rehabilitation Sciences > Communication Science and Disorders
Swanson School of Engineering > Electrical and Computer Engineering
Refereed: Yes
Date Deposited: 25 Jul 2016 18:45
Last Modified: 30 Mar 2021 11:55


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