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DYSPHAGIA ASSESSMENT AND TREATMENT PLANNING: A TEAM APPROACH
of cerebellar rTMS. A case report (Vas­ant et al., 2019), a pseudo-RCT (Zhong et al., 2021), and an RCT (Dong et al.,
2022) found that it may be beneficial for poststroke dysphagia. Overall, several recent systematic reviews and meta­analyses suggested that rTMS has treat­ment benefits for dysphagia (Cheng et al., 2021; Chiang et al., 2019; Liao et al., 2017; Pisegna et al., 2016; Speyer, Sutt, Bergström, Hamdy, Pommée, et al., 2022; Yang et al., 2015). Importantly, Cheng et al. (2021) found that bilateral rTMS showed the greatest benefits among all rTMS protocols. Moreover, the effects of rTMS were the most significant dur­ing the first 2 weeks posttreatment, and they diminished after 3 months.
Other studies suggested that rTMS may be beneficial for dysphagia asso­ciated with PD and old age. A pilot RCT with a crossover design found that three types of neurostimulation, including 1 Hz rTMS, 5 Hz rTMS, and PES, were well tolerated by PD patients (Sasegbon et al., 2021). However, the clinical effects remain uncertain given the small sample size. In another RCT study with 33 PD patients, Khedr et al. (2019) reported improved timing of hyoid bone elevation and pharyn­geal transit time after 10-day bilateral 20 Hz rTMS applied over hand motor cortex. In elderly patients with dyspha­gia, Park et al. (2017) found that 5 Hz rTMS improved swallowing function and increased cortical activation dur­ing swallowing.
tDCS
The neurophysiological effects of tDCS in the pathological population are less well explored compared to rTMS.
Functionally, studies showed that uni­lateral tDCS reduces dysphagia sever­ity (Kumar et al., 2011; Mao et al., 2021; Sawan et al., 2020; Shigematsu et al., 2013; Suntrup-Krueger et al., 2018; Yang et al., 2012) and improves nutritional status (Mao et al., 2021). By contrast, the effects of bilateral tDCS were less consistent. Two studies reported no treatment effects of bilateral tDCS (Ahn et al., 2017; Pingue et al., 2018). How­ever, a study found that bilateral anodal tDCS combined with balloon dilation therapy and conventional swallowing therapy improved swallowing func­tion and pharyngoesophageal segment opening (Wang et al., 2020). Another study found that unilateral contral­esional anodal tDCS and bilateral tDCS improved swallowing function in patients with unilateral and bilat­eral hemispheric stroke, respectively (Sawan et al., 2020). Overall, systematic reviews and meta-analyses found that tDCS has modest but promising benefi­cial effects for patients with poststroke dysphagia (Cheng et al., 2021; He et al., 2022; Lin et al., 2021; Marchina et al., 2021; Speyer, Sutt, Bergström, Hamdy, Pommée, et al., 2022). Some studies sug­gested that tDCS may also be beneficial for patients with dysphagia associated with multiple sclerosis (MS) (Cosentino et al., 2018; Restivo et al., 2019).
PES
Several RCT studies have shown that PES can reduce the risk of penetration and aspiration and improve swallow­ing function in patients with poststroke dysphagia (Cabib et al., 2020b; Dziewas et al., 2018; Fraser et al., 2002; Jayase­keran et al., 2010; Michou et al., 2014;
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Suntrup, Marian, et al., 2015), although some reported no treatment effects (Bath et al., 2016; Vasant et al., 2016). Importantly, two large-scale studies found that PES can facilitate decannu­lation in tracheostomized patients with severe dysphagia (Dziewas et al., 2018; Suntrup, Marian, et al., 2015). Overall, current evidence suggested that PES is beneficial for patients with poststroke dysphagia, but its longer term (beyond 2 weeks) effects remain uncertain (Cheng et al., 2021). Furthermore, studies sug­gested that PES may improve swallow­ing function in MS patients (Restivo et al., 2013) and potentially in PD patients (Sasegbon et al., 2021).
Limitations of Neuromodulation Treatments
Despite their potential benefits for dys­phagia, these neuromodulation tech­niques have not been widely adopted in clinical practice due to some prac­tical issues and limitations (Cheng & Hamdy, 2021; Cheng, Sasegbon, et al.,
2022). Among these techniques, PES is the only one that has received both EC and (recent) FDA approval as a dyspha­gia treatment. For NIBS, small studies and heterogeneous treatment proto­cols made drawing of definitive con­clusions challenging, and their long­term (beyond 3 months) effects remain poorly explored. Moreover, the opera­tional costs can be high given that both rTMS and tDCS require specialized equipment and trained personnel to operate (Cheng, Sasegbon, et al., 2022). Finally, NIBS is limited by the response variability. Studies have reported that genetic predispositions (Hwang et al., 2022; Raginis-Zborowska et al., 2019)
and neural activation before stimula­tion (Cheng et al., 2020) may contribute to such variability. Response variability may be minimized by preconditioning the brain prior to stimulation (Cheng et al., 2020), but further studies are needed to fully elucidate the effects of preconditioning in dysphagic patients.
CONCLUSION/FUTURE WORK
Neuromodulation treatments, includ­ing rTMS, tDCS, and PES, have shown potential in facilitating dysphagia reha­bilitation following stroke. Future work should focus on the long-term treat­ment benefits and explore the treatment effects in different pathological popula­tions. Further studies should also iden­tify strategies that maximize treatment outcomes, for example, identification of genetic biomarkers for treatment responses or preconditioning of the brain before treatment.
CONFLICTS OF INTEREST
SH is a board director, shareholder, and chief scientific officer of Phagenesis Ltd., a company that is involved in dys­phagia treatment. IC and SH authored some of the papers that were referenced in this review.
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The Treatment Plan: Medical
https://t.me/medicina_free
and Surgical Therapies
Katherine A. Kendall
MEDICAL THERAPIES
Medical therapies designed specifically for the treatment of dysphagia from any cause have not been developed. Rather, therapies designed to treat the underlying medical condition resulting in dysphagia are the mainstay of medi­cal therapy. It is, therefore, extremely important to identify the etiology of the dysphagia in any given patient so that appropriate medical therapy, aimed at treating the underlying cause of the dysphagia, can be instituted.
Neuromuscular Disease
When a neuromuscular disease is the etiology of the dysphagia, it must be ascertained if the medical therapy appropriate for treating the condition has been maximized. For any patient with dysphagia, a review of other medications prescribed for the patient
will help determine if any of them may contribute to dysphagia. Many drugs prescribed for neuromuscular disease affect the cholinergic nervous system and are known to have an effect on swallowing (see Chapter 2). Therefore, the same drugs prescribed to treat the neuromuscular disease may have a del­eterious effect on swallowing. A balance between therapeutic benefit and side effects of medications must be achieved.
In several types of neuromuscular disease, cricopharyngeal achalasia, or failure of the cricopharyngeus muscle to relax, has been commonly identified. In many of these patients, cricopharyn­geal myotomy may be considered. (See below for further discussion of crico­pharyngeal myotomy.)
Gastroesophageal Reflux (GERD)
Gastroesophageal reflux (GERD) is the result of the reflux of gastric contents
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