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Related Experiment Video

Updated: Jun 6, 2026

Simultaneous Laryngopharyngeal and Conventional Esophageal pH Monitoring

Simultaneous Laryngopharyngeal and Conventional Esophageal pH Monitoring

Published on: December 14, 2020

Pharyngeal flow interval: a novel impedance-based parameter correlating with aspiration.

L Noll¹, N Rommel, G P Davidson

¹Gastroenterology Unit, Child, Youth & Women's Health Service, North Adelaide, SA, Australia.

Neurogastroenterology and Motility

|December 15, 2010

Summary

Pharyngeal impedance recording, using a novel flow interval parameter, can identify aspiration risk in children with cerebral palsy. This method shows promise for predicting swallowing difficulties.

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Adapting Human Videofluoroscopic Swallow Study Methods to Detect and Characterize Dysphagia in Murine Disease Models

Published on: March 1, 2015

Area of Science:

Otolaryngology
Swallowing Disorders
Biomedical Engineering

Background:

Pharyngeal impedance recording is an emerging technique for assessing swallowing function.
Its utility in evaluating pharyngeal function, particularly in relation to bolus residue and aspiration, requires further establishment.
This study investigates a novel parameter, impedance flow interval, and the impact of catheter configuration.

Purpose of the Study:

To evaluate the impedance flow interval as a novel parameter for assessing pharyngeal function.
To correlate impedance flow interval with post-swallow bolus residue and deglutitive aspiration.
To assess the effect of different catheter configurations on impedance measurements.

Main Methods:

12 children (1.8-13.5 years) with cerebral palsy underwent simultaneous videofluoroscopy and pharyngeal impedance recording.
Two catheter configurations (1.9mm diameter/1cm electrodes and 3.2mm diameter/2cm electrodes) were utilized.
Impedance flow interval was calculated and correlated with fluoroscopic findings of residue and aspiration.

Main Results:

A longer flow interval was significantly associated with aspiration across both catheter configurations.
A longer flow interval was associated with bolus residue, particularly with the larger catheter (Catheter 2).
Higher flow interval was a stronger predictor of aspiration (OR 13.4) than the presence of residue (OR 3.8).

Conclusions:

Impedance measurement, specifically the flow interval, can detect alterations in pharyngeal swallow flow characteristics.
This novel parameter shows potential for predicting deglutitive aspiration risk in pediatric patients.
Pharyngeal impedance recording offers a promising, objective method for swallowing function assessment.