Detection of swallow kinematic events from acoustic high resolution cervical auscultation signals in patients with stroke

Publication date: Available online 30 July 2018

Source: Archives of Physical Medicine and Rehabilitation

Author(s): Atsuko Kurosu, James L. Coyle, Joshua Dudik, Ervin Sejdic

Abstract

Objective

To examine whether there were any associations between high resolution cervical auscultation (HRCA) acoustic signals recorded by a contact microphone and swallowing kinematic events during pharyngeal swallow as assessed by a videofluoroscopic examination.

Design

Prospective pilot study

Setting

University teaching hospital, University research laboratories

Participants

35 patients with stroke who have suspected dysphagia (26 males + 9 females; age = 65.8 ± 11.2).

Methods

Videofluoroscopic recordings of one hundred liquid swallows from 35 stroke patients were analyzed, and a variety of HRCA signal features to characterize each swallow were calculated.

Main Outcome Measure(s)

Percent of signal feature maxima (peak) occurring within 0.1 seconds of swallow kinematic event identified from videofluoroscopic recording

Results

Maxima of HRCA signal features, such as standard deviation, skewness, kurtosis, centroid frequency, bandwidth, and wave entropy, were associated with hyoid elevation, laryngeal vestibule closure, and upper esophageal sphincter opening, and the contact of the base of the tongue and posterior pharyngeal wall.

Conclusions

Although the kinematic source of HRCA acoustic signals has yet to be fully elucidated, these results indicate a strong relationship between these HRCA signals and several swallow kinematic events. There is a potential for HRCA to be developed for diagnostic and rehabilitative clinical management of dysphagia.

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