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Updated: Aug 5, 2026
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Adapting Human Videofluoroscopic Swallow Study Methods to Detect and Characterize Dysphagia in Murine Disease Models
Published on: March 1, 2015
Swallowing Dysfunction and Histopathological Changes in a Rat Model of Duchenne Muscular Dystrophy
Masayuki Kitano1, Hiroe Ohnishi1, Keiichi Tamura1
1Department of Otolaryngology-Head and Neck Surgery, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, 606-8507, Japan.
Dysphagia
|August 4, 2026
Summary
Duchenne muscular dystrophy (DMD) causes progressive dysphagia. DMD rats show impaired swallowing function and muscle pathology, making them a valuable model for studying DMD-related swallowing difficulties.
Area of Science:
- Neurology
- Muscle Physiology
- Biomedical Research
Background:
- Duchenne muscular dystrophy (DMD) is linked to progressive swallowing difficulties (dysphagia).
- Previous research noted muscle changes in DMD rats, but pharyngeal swallowing muscles remain understudied.
- Understanding swallowing impairments in DMD is crucial for patient care.
Purpose of the Study:
- To investigate swallowing function and muscle pathology in a DMD rat model.
- To evaluate specific swallowing-related muscles, including those in the pharyngeal phase.
- To establish the utility of DMD rats for dysphagia research.
Main Methods:
- Compared seven DMD rats with five wild-type (WT) rats.
- Monitored body weight and food intake.
- Utilized electromyography (EMG) on the geniohyoid muscle.
- Performed histopathological analysis on multiple swallowing muscles.
- Assessed compound muscle action potential (CMAP) amplitude, swallow frequency, and duration.
Main Results:
- DMD rats showed reduced body weight and food intake.
- Significant decreases in muscle fiber area were observed in four of five muscles.
- All examined muscles displayed increased fibrosis and central nuclei.
- EMG revealed lower CMAP amplitude, reduced swallow frequency, and prolonged hyoid elevation in DMD rats.
Conclusions:
- DMD rats exhibit impaired swallowing function and pathological muscle changes mirroring human DMD.
- These findings highlight the significant impact of DMD on swallowing mechanisms.
- DMD rats serve as a relevant model for investigating DMD-associated dysphagia and developing treatments.
