Publications by authors named "Yuta Nakao"

Sarcopenic dysphagia is defined as dysphagia caused by sarcopenia of the whole body and swallowing-related muscles. We present a case of sarcopenic dysphagia with improved swallowing function after strength training of swallowing-related muscles using neuromuscular electrical stimulation (NMES). A 78-year-old man was admitted to our hospital with an intraductal papillary mucinous tumor of the pancreatic duct.

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Since CRISPR-based genome editing technology works effectively in the diploid frog Xenopus tropicalis, a growing number of studies have successfully modeled human genetic diseases in this species. However, most of their targets were limited to non-syndromic diseases that exhibit abnormalities in a small fraction of tissues or organs in the body. This is likely because of the complexity of interpreting the phenotypic variations resulting from somatic mosaic mutations generated in the founder animals (crispants).

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Introduction: Changes in skeletal muscle mass affect physical performance in chronic stroke survivors. The skeletal muscle mass index is thus an important assessment factor in stroke; however, its value in the acute phase is unclear.

Objective: This study investigated the association between skeletal muscle mass and acute stroke outcome.

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Background: Constraint-induced aphasia therapy (CIAT) has been reported as a short-term, intensive language training program for improving language function in patients with chronic aphasia. We report the recovery of language function in a patient with chronic aphasia who was evaluated in the baseline assessment as having reached a plateau.

Case: The patient with subcortical aphasia was a 62-year-old, right-handed man.

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In the assessment of skeletal muscle strength, rate of force development (RFD) is clinically identified as a functional index that reflects the effects of aging, but there are few reports on RFD of the tongue. The purpose of this study was to examine the relationship between RFD of tongue pressure (RFD-TP) and oral and whole-body physical performance in older adults, and to clarify its characteristics. We enrolled adults aged ≥65 years with pathological occlusal contact in premolar and molar regions of teeth in the Tamba-Sasayama area, Japan, from 2017 to 2018.

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The International Dysphagia Diet Standardization Initiative (IDDSI) proposed the flow test (FT) as a simple method for measuring the viscosity of thickened liquids. However, the FT specifies the use of a particular syringe type (BD-Slip), which is unfortunately not easily available in Japan. Therefore, the current study primarily aimed to investigate the effects of the internal syringe shape on IDDSI FT and identify the most suitable syringe available in Japan for xanthan gum-based thickened liquids.

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Background: Rate force development is associated with performance and muscle composition in whole-body muscle. Although rate force development on tongue muscle can be examined using tongue pressure waveform, there have been only few investigations on this topic.

Objectives: This study's main purpose was to investigate the reliability of tongue pressure waveform analysis and its relationship with articulation and tongue muscle composition.

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Nutritional status is well-known to influence patient recovery after resection of head and neck cancer (HNC). The influence of preoperative nutritional status on dysphagia was assessed in patients who underwent surgical resection of HNC along with the assessment of nutritional status during the acute and subacute phases. Eighty-six patients underwent surgical resection and dysphagia assessments (repetitive saliva-swallowing test, water-swallowing test, and functional oral intake scale) and had their tongue pressure assessed five times (before surgery, after 1-2 weeks, and 1, 2, and 3 months after surgery).

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Background: Dysphagia is considered a social problem in the super-aging society. However, age-related changes in swallowing-related muscles have not been fully deciphered.

Aims: We aimed to identify intramuscular fatty infiltration and muscle atrophy in multiple swallowing-related muscles on magnetic resonance imaging (MRI).

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Considering that thickened liquids are frequently used for patients with dysphagia, elucidating their impact on laryngeal dynamics is important. Although studies have investigated the impact of thickened liquids on laryngeal movement velocity among healthy young adults, no study has examined the same among patients with dysphagia. We aimed to elucidate the influence of bolus consistency on laryngeal movement velocity and surface electromyographic activity of the suprahyoid muscles in patients with dysphagia.

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The susceptible-infected-recovered (SIR) model with spatially inhomogeneous infection rate is studied with numerical simulations in one, two, and three dimensions, considering the case that the infection spreads inhomogeneously in densely populated regions or hot spots. We find that the total population of infection decays very slowly in the inhomogeneous systems in some cases, in contrast to the exponential decay of the infected population I(t) in the SIR model of the ordinary differential equation. The slow decay of the infected population suggests that the infection is locally maintained for long and it is difficult for the disease to disappear completely.

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Muscle aging such as sarcopenia adversely affects motor activities. However, few studies have elucidated the aging physiological mechanism of tongue concerted with the changes muscle composition. The present study aimed to examine the tongue composition changes to detect the effect of tongue fat mass on tongue pressure and swallowing function with aging.

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Background: The aim of this study was to evaluate the validity of a dysphagia screening test (DST) in patients who have undergone resection for head and neck cancer (HNC). In addition, we examined whether or not combined effects of DSTs improve the detection accuracy of penetration/aspiration.

Methods: Thirty-six HNC patients were participated.

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The cyclopentane core framework 23 of pactamycin (1) was synthesized in 14 steps from symmetric cyclohexadiene 11. Our synthetic strategy features Rh-mediated catalytic desymmetrization of 10 via aziridination and then regioselective ring-opening reaction of sulfonylaziridine 9 with NaN, ring-contraction of cyclohexene 14 by ozonolysis followed by intramolecular aldol reaction, and stereoselective construction of the sequential tetrasubstituted carbons by dihydroxylation and methylation reaction. Stereospecific incorporation of amine on tetrasubstituted carbon was achieved by Curtius rearrangement and subsequent carbamide formation.

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Tongue pressure is reportedly associated with dysphagia. This study investigated relationships among characteristics of head and neck cancer, tongue pressure and dysphagia screening tests performed in patients with head and neck cancer during the acute phase after surgical resection. Fifty-seven patients (36 men, 21 women; age range 26-95 years) underwent surgical resection and dysphagia screening tests (Repetitive Saliva Swallowing Test, Water Swallowing Test, Modified Water Swallowing Test and Food Test) and pre- and postoperative measurement of tongue pressure at 5 time points (preoperatively, and 1-2 weeks and 1, 2, and 3 months postoperatively).

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A 64-year-old man who ingested liquid paraffin as a laxative for over two years, was admitted to our hospital with a persistent interstitial lung shadow and marked elevation of serum KL-6. He had no overt symptoms although his chest radiograph revealed ground glass opacities in the left lower lung field and right middle and lower lung fields. We performed fiberoptic bronchoscopy.

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A 28-year-old man complaining of myiodesopsia was given a diagnosis of uveitis. Subsequently he complained facial nerve palsy and enlargement of parotid gland. Heerfordt's syndrome was diagnosed based on the results of several examinations.

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Various autoimmune diseases have been reported to occur in patients with sarcoidosis. However, coexistence of sarcoidosis and antiphospholipid syndrome (APS) is extremely rare. We describe a 59-year-old female patient with pulmonary sarcoidosis who had preceding APS.

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