Hiroshi Nagayama

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BACKGROUND Asymmetric dimethylarginine (ADMA) affects vascular function by blocking nitric oxide synthesis. We examined the relationship of ADMA concentration to vascular risk factors in subjects who have undergone annual medical check-up. METHODS ADMA concentration, lipid profile and vascular risk factors were assessed during an annual medical(More)
OBJECTIVE Anhedonia is one of the main non-motor symptoms in Parkinson's disease (PD); it is assessed using the Snaith-Hamilton pleasure scale (SHAPS). To assess anhedonia in the Japanese population, we prepared a Japanese language version of SHAPS (SHAPS-J), and evaluated its validity and reliability in 8 neurological centers. Seventy subjects (48 patients(More)
Levodopa (LD) is one of the most effective drugs for clinical symptoms in patients with Parkinson disease (PD). Most PD patients are advanced in age and may have trouble with LD absorption because aging influences drug absorption processes. Previous reports have indicated that ascorbic acid (AsA) can reduce LD dosage without losing its effectiveness. The(More)
OBJECTIVE We investigated whether a correlation exists between insulin resistance and the severity of cerebral white matter lesions among non-diabetic patients with ischemic stroke. METHODS The subjects were 105 consecutive patients without diabetes who were hospitalized due to non-cardioembolic stroke. The insulin resistance was evaluated by a(More)
Bilateral vocal fold abductor paralysis was seen in a patient with Creutzfeldt-Jacob disease. After tracheotomy, the patient showed disappearance of reduced oxygen saturation with high-pitched inspiratory stridor and pulling phenomenon of the supraclavicular region and larynx. Electromyographic examinations of the intrinsic laryngeal muscles, including the(More)
OBJECTIVES Levodopa (LD) is the most effective antiparkinsonian drug used in the treatment of Parkinson disease (PD). Sex differences in the bioavailability of LD have been shown previously. In addition, epidemiological sex differences in PD have been reported, suggesting an involvement of estrogen. In this study, we evaluated the pharmacokinetics of LD in(More)
BACKGROUND Pain is a frequent, troublesome symptom of PD but is under-recognized and poorly understood. AIM We characterized pain prevalence, severity, and location in PD, to better understand its pathophysiology and improve diagnosis and treatment. SUBJECTS AND METHODS A cross-sectional controlled study was conducted at 19 centers across Japan. A total(More)
Anhedonia is one of the non-motor symptoms observed in the Parkinson's disease (PD). However, there is no clear relationship between anhedonia and its correlation with other symptoms of PD. The aim of this study is to evaluate the characteristics of anhedonia and its correlation with clinical aspects of PD in a relatively large cohort. We enrolled 318(More)