Effect of Changes in Bolus Viscosity on Swallowing Muscles in Patients with Dysphagia after Stroke
To the Editor: In the last recent years, significant progress has been achieved in research on dysphagia. This is important because approximately 50% of patients with dysphagia after acute stroke still have a slow functional recovery, and the duration of disease may last for several months or the whole life. The ultimate aim of dysphagia treatment is for patients to be able to eat again and to examine if the influence of eating conditions is inevitable in dysphagia research. Changes in the peripheral afferent nervous system related to eating, such as alimentary bolus characters and eating postures, can result in adjustments of swallowing by afferent pathways of the central nervous network, followed by corresponding changes in the time sequence, duration, and intensity of oropharyngeal muscle activities. Therapists often choose alimentary bolus according to their own experience with direct ingestion training, without quantitative evaluation of swallowing muscle group activities.
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