Swallowing Function After Continuous Neuromuscular Electrical Stimulation of the Submandibular Region Evaluated by High-Resolution Manometry

AbstractAlthough neuromuscular electrical stimulation (NMES) is increasingly used in dysphagia therapy, patient responses to NMES are inconsistent and conflicting results have been reported. This, together with a lack of information about the effects of NEMS on the swallowing process, has led to an ongoing debate about its impact on swallowing function. In order to address this, we set out to (i) collect baseline information on the physiological effects of NMES on the complex pharyngeal phase of swallowing and (ii) to compare two different stimulation protocols. In doing so, we provide information useful for evaluating the therapeutic effectiveness of NMES on the swallowing process. In a prospective study, 29 healthy participants performed water swallows after receiving continuous NMES for 10  min. The stimulus was applied in the submandibular region using one of two different stimulation protocols: low-frequency stimulation (LFS) and mid-frequency stimulation (MFS). Swallowing parameters of the pharynx and UES were measured using high-resolution manometry. Maximum tongue base pressure increased by 8.4% following stimulation with the MFS protocol. Changes in UES function were not found. LFS stimulation did not result in any significant changes in the parameters examined. The MFS protocol enhances tongue base retraction during swallowing in healthy volunteers. The magnitude of the effect, however, was small, possibly due to the ability of healthy subjects to compensate for ex...
Source: Dysphagia - Category: Speech Therapy Source Type: research