Validation of the optimal site in the neck region for detecting swallowing sounds

Abstract

Recently, the swallowing sound has been used to detect swallowing events non-invasively. A previous study, using an accelerometer, showed that the site over the lateral border of the trachea immediately inferior to the cricoid cartilage was the optimal site for detecting swallowing sounds. However, the optimal site for detection of the swallowing sound using a microphone remains undetermined. To validate the optimal site in the neck region for detecting swallowing sounds. Fourteen healthy subjects (mean age, 27·6 ± 2·2 years; seven male and seven female) participated in this study. Twenty condenser microphones were attached to 20 sites on the left neck surface to detect swallowing sounds. Participants were instructed to swallow five different stimuli three times as follows: Resting saliva, 1 and 5 mL of Japanese tea, and 1 and 5 mL of yoghurt. Mean relative peak intensity was used to indicate the magnitude of the swallowing sound. Sound spectrograms were used to illustrate differences in the properties of swallowing sounds. Mean relative peak intensity number was highest in sites at the inferior border of the mandible just above the sternocleidomastoid muscle (site 11) and sites over the lateral border of the trachea immediately inferior to the cricoid cartilage (site 8). Comparison of spectrograms showed a greater density distribution of higher frequency components at site 11 compared with site 8. These results indicate that the inferior border of the mandible just above the sternocleidomastoid muscle is the optimal site for the detection of swallowing sounds.

The effects of neuromuscular joint facilitation treatment using neck patterns on the acoustic analysis of swallowing sounds in healthy adults

“…Before the interventions, the auscultation positions were marked on the left and right sides of the neck, above the cricoid cartilage, in front of the sternocleidomastoid muscle and the large vessels [12][13][14] . The examiner gently placed the electronic stethoscope (Littmann Model 3200; 3M, MN, USA) on the marked positions on the neck to collect the swallowing sounds.…”

Ausculta Cervical en el Paciente Pediátrico con Parálisis Cerebral: Revisión Narrativa

“…Para su análisis, el clínico necesitará de la interpretación gráfica y acústica de las cualidades del sonido, entendiendo parámetros de acción estipulados en la conducta motora, secuencial, sincrónica y coordinada de la acción funcional de la ingesta (Vargas, 2019) (Pan et al, 2016). Para ello, requiere del conocimiento anatómico y fisiológico del proceso deglutorio, pero también de las cualidades técnicas del sonido.…”