記述言語：英語   出版者・発行元：Experimental Gerontology  

Objectives: The purpose of this study was to examine the relationship of the serum creatinine/cystatin C ratio (CCR) with hand grip strength (HGS), total body muscle mass, trunk muscle mass, and skeletal muscle mass index (SMI) in patients attending a memory clinic. Design: This cross-sectional study enrolled outpatients of a memory clinic in Japan from October 2010 to July 2017. Setting and participants: We enrolled 1945 participants aged 60 years or older with measured skeletal muscle mass, HGS, and serum creatinine and serum cystatin C levels. Measures: Linear multiple regression analysis was performed for men and women using total body muscle mass, trunk muscle mass, and SMI as objective variables. The exposure variables were selected from previous reports if they were strongly linked to muscle mass. Total body muscle mass and trunk muscle mass were corrected by dividing by body weight. Multiple regression analysis was also conducted for men and women using HGS as an objective variable. Because cognitive function and HGS are strongly related, we also conducted sensitivity analysis by excluding participants with a Mini-Mental State Examination score < 24 to alleviate any concern that we did not fully adjust for the effect of cognitive dysfunction. Results: In men, CCR was significantly associated with total body muscle mass, trunk muscle mass, and SMI (P = 0.013, P = 0.008, and P < 0.001, respectively). In women, CCR was significantly associated with total body muscle mass and trunk muscle mass (P = 0.013 and P < 0.001, respectively), but not with SMI (P = 0.932). On the other hand, CCR was significantly associated with grip strength in both men and women (P < 0.001 and P < 0.001, respectively). Conclusions: CCR was associated with both muscle mass and muscle strength. This study suggests that CCR is a useful marker not only for muscle mass but also for muscle strength.

DOI： 10.1016/j.exger.2022.111935

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記述言語：英語   出版者・発行元：Nutrition  

Objectives: Muscle ultrasound is a non-invasive technique that enables identification of the quantity and quality of muscle tissue. It has been used not only for diagnosis of sarcopenia but also for prediction of outcomes in clinical practice. There is now increasing awareness that muscle changes detected during acute hospitalization indicate acute sarcopenia leading to worse outcomes. However, to our knowledge, few studies have investigated this in hospitalized older adults. The aim of this study was to determine whether muscle changes on muscle ultrasound can predict poor outcomes in acute hospitalized older adults. Methods: This prospective, observational cohort study involved 145 acute hospitalized older adults. Bilateral anterior thigh thickness (BATT), echo intensity (EI), and corrected EI of the quadriceps were assessed on admission and 7 d later. The primary outcome was mortality, and the secondary outcomes were hospital-associated complications and decline in activities of daily living (ADLs) at 3 mo after discharge. Results: Changes in BATT, EI, and corrected EI at 7 d after admission were found in 0.2%, 0.0%, and 0.2% of cases, respectively. The respective rates for mortality, hospital-associated complications, and ADL decline were 8.7%, 52.8%, and 43%, respectively. Multivariable logistic regression analysis showed that the BATT value at admission tended to be associated with mortality. Changes in BATT, EI, and collected EI were not associated with adverse outcomes. Conclusions: Acute muscle changes on muscle ultrasound were not associated with mortality, ADL decline, or hospital-associated complications in acute hospitalized older adults. More research in various settings is needed to clarify the value of muscle ultrasound in clinical practice.

DOI： 10.1016/j.nut.2022.111698

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記述言語：英語   出版者・発行元：Scientific Reports  

Individuals with mild cognitive impairment (MCI) often make qualitative errors on the Clock Drawing Test (CDT), and these errors are reported to be associated with lower scores on neuropsychological assessments. Gait speed is also closely associated with cognitive dysfunction. However, the association between CDT errors and gait speed has not been investigated in individuals with MCI. Therefore, in this study, we explored the association between gait speed and qualitative errors on the CDT. Participants were 196 outpatients at a memory clinic with a clinical dementia rating of 0.5. The CDT was evaluated using the method of Cahn et al. The participants were divided into tertiles of normal and maximum gait speeds. The CDT error types of stimulus-bound response, conceptual deficit (CD), and planning deficit were found in 24.5%, 29.6%, and 30.1% of the participants, respectively. CD was found in 43.6% of the slowest tertile of maximum gait and in 22.2% of the fastest tertile. Multiple linear regression analysis gait speeds as objective continuous variables revealed that CD was significantly negatively associated with maximum gait, but not with normal gait. No other error types were associated with gait speeds. Only CD type error on the CDT was negatively associated with maximum gait speed, but not normal gait speed in the current study. The association between the qualitative error on the CDT and gait speed provides further basis of the clinical importance of qualitative assessments of CDT.

DOI： 10.1038/s41598-022-14084-2

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記述言語：英語   出版者・発行元：Journal of Alzheimer's Disease  

Quality of life (QOL) was assessed using the EQ-5D twice in 1 year in 57 older community-dwelling people (age 79.1±5.9 years) with mild cognitive impairment in a memory clinic. Screening for sarcopenia at the initial assessment revealed 40.1% of participants (23/57) were sarcopenic. QOL declined in 33.3% of participants (19/57) after around 1 year. Multiple logistic regression analysis showed that sarcopenia was associated with a decline in QOL around 1 year after initial assessment. Sarcopenia may be a risk factor for decline in QOL in older people with mild cognitive impairment.

DOI： 10.3233/JAD-220123

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記述言語：日本語   出版者・発行元：Geriatrics and Gerontology International  

DOI： 10.1111/ggi.14251

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記述言語：英語   出版者・発行元：Geriatrics and Gerontology International  

DOI： 10.1111/ggi.14206

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記述言語：日本語   出版者・発行元：Experimental Gerontology  

Background: Hospital-associated complications are associated with adverse outcomes after discharge, and a method to help predict the occurrence of these complications needs to be established. Sarcopenia is thought to be one of the factors associated with hospital-associated complication, but sarcopenia assessment in hospitalized patients is often difficult. Focus has recently been placed on morphological and qualitative evaluation of muscle by ultrasound as an index of sarcopenia. Therefore, in this study, we sought to clarify the association of hospital-associated complication with muscle thickness or echo intensity measured by ultrasound and with commonly used sarcopenia-related parameters. Methods: This is a prospective observational cohort study with 156 hospitalized older patients recruited over a year. Bilateral thigh muscle thickness of rectus femoris and vastus intermedius, echo intensity and corrected echo intensity of rectus femoris were measured by ultrasound. Also measured were the sarcopenia-related parameters of handgrip strength, skeletal muscle index, and maximum calf circumference. Hospital-associated complication was defined as the occurrence of any of the following complications: delirium, functional decline, incontinence, falls, pressure injuries, and nosocomial infections. Results: Of 156 patients enrolled at admission, hospital-associated complication was observed in 70 (54.3%). With-hospital-associated complication group had a higher prevalence of emergency admission and a higher corrected echo intensity than without-hospital-associated complication group. Multivariate logistic regression analysis showed that only higher corrected echo intensity was associated with hospital-associated complication (odds ratio 1.036; 95% confidence interval, 1.001–1.072), while handgrip strength, bilateral thigh muscle thickness, skeletal muscle index, and maximum calf circumference were not. Conclusions: Corrected echo intensity might be a useful parameter to help predict hospital-associated complication in acute hospitalized older patients and might contribute to establishing a strategy to prevent hospital-associated complication.

DOI： 10.1016/j.exger.2021.111397

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記述言語：英語   出版者・発行元：Geriatrics and Gerontology International  

DOI： 10.1111/ggi.14149

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記述言語：日本語   出版者・発行元：Journal of Alzheimer's Disease  

Background: Homocysteine is a common risk factor for cognitive impairment and sarcopenia. However, very few studies have shown an association between sarcopenia and serum homocysteine levels after adjustment for cognitive function. Objective: The purpose of this study was to investigate the relationship between homocysteine and sarcopenia in memory clinic patients. Methods: This cross-sectional study investigated outpatients in a memory clinic. We enrolled 1,774 participants (≥65 years old) with measured skeletal muscle mass index (SMI), hand grip strength (HGS), and homocysteine. All participants had undergone cognitive assessments and were diagnosed with dementia, mild cognitive impairment, or normal cognition. Patient characteristics were compared according to sarcopenia presence, SMI level, or HGS. Multivariate logistic regression analysis was performed to determine the association of homocysteine with sarcopenia, low SMI, or low HGS. Next, linear regression analysis was performed using HGS as a continuous variable. Results: Logistic regression analysis showed that low HGS was significantly associated with homocysteine levels (p=0.002), but sarcopenia and low SMI were not. In linear regression analysis, HGS was negatively associated with homocysteine levels after adjustment for Mini-Mental State Examination score (β=-2.790, p<0.001) or clinical diagnosis of dementia (β=-3.145, p<0.001). These results were similar for men and women. Conclusion: Our results showed a negative association between homocysteine and HGS after adjustment for cognitive function. Our findings strengthen the assumed association between homocysteine and HGS. Further research is needed to determine whether lower homocysteine levels lead to prevent muscle weakness.

DOI： 10.3233/JAD-210083

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記述言語：日本語   出版者・発行元：Journal of Alzheimer's Disease  

Background: Few studies have investigated associations between types of clock drawing test (CDT) errors and cognitive impairment. Objective: To explore associations of qualitative errors in the CDT with comprehensive neurocognitive assessment scores and clinical diagnosis. Methods: Outpatients at a memory clinic were enrolled. Frequencies of errors determined by Cahn's method were explored according to cognitive status (cognitively normal [CN] (n=279), mild cognitive impairment [MCI] (n=321), and Alzheimer's disease [AD]) (n=575). Neuropsychological assessment scores were compared between participants with and without errors. Results: Stimulus-bound response (SB) was relatively rare (6.8%) in the CN group but was markedly more common in the MCI (23.4%) and AD (33.2%) groups. Conceptual deficit (CD) was found in more than 20%of CN individuals, as well as about 50%of AD patients. Planning deficit (PD) frequencies were relatively similar among the groups. SB in both of CN and MCI individuals, and CD in both of CN and MCI individuals were associated with lower scores in several neuropsychological assessments. Meanwhile, PD was not associated with lower assessment scores in any of CN, MCI, or AD individuals. Conclusion: The frequencies of SB and CD increased from CN, MCI, to AD but showed somewhat different patterns. Both SB and CD were associated with lower cognition in all three cognitive stages.

DOI： 10.3233/JAD-210456

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記述言語：日本語   出版者・発行元：Nutrients  

Chronic dehydration mainly occurs due to insufficient fluid intake over a lengthy period of time, and nursing home residents are thought to be at high risk for chronic dehydration. However, few studies have investigated chronic dehydration, and new diagnostic methods are needed. Therefore, in this study, we aimed to identify risk factors for chronic dehydration by measuring serum osmolality in nursing home residents and also to evaluate whether examining the inferior vena cava (IVC) and determining the IVC collapsibility index (IVC-CI) by ultrasound can be helpful in the diagnosis of chronic dehydration. A total of 108 Japanese nursing home residents aged ≥65 years were recruited. IVC measurement was performed using a portable handheld ultrasound device. Fifteen residents (16.9%) were classified as having chronic dehydration (serum osmolality ≥295 mOsm/kg). Multivariate logistic regression analysis showed that chronic dehydration was associated with dementia (odds ratio (OR), 6.290; 95% confidential interval (CI), 1.270–31.154) and higher BMI (OR, 1.471; 95% CI, 1.105–1.958) but not with IVC or IVC-CI. Cognitive function and body weight of residents should be considered when establishing a strategy for preventing chronic dehydration in nursing homes.

DOI： 10.3390/nu12113562

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記述言語：英語   出版者・発行元：Journal of Clinical Medicine  

To evaluate the predictability of progression of cognitive impairment to dementia using qualitative clock drawing test (CDT) scores, we administered both the CDT using Cahn et al.’s qualitative scoring system and the Mini-Mental State Examination (MMSE) to assess cognitive function in non-demented older individuals attending a memory clinic at a university hospital. Patients visiting the clinic for assessment of cognitive function between January 2015 and December 2019 were enrolled, and only those who were diagnosed as not having dementia at the time of initial assessment completed a follow-up assessment at 1 y (n = 163). To examine any association of qualitative CDT score with progression to dementia, multiple logistic regression analysis was conducted with the change in diagnosis from non-dementia to dementia at 1 y as the dependent variable. A total of 26 participants (16.0%) were diagnosed as having converted to dementia. Multiple logistic regression analysis revealed that both the qualitative CDT score using Cahn et al.’s scoring system and the existence of conceptual deficits were significantly associated with progression to dementia at 1 y after initial assessment of cognitive function, irrespective of the MMSE score, among non-demented older individuals. The CDT may be a useful predictor of progression to dementia in primary care settings.

DOI： 10.3390/jcm9092850

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記述言語：日本語   出版者・発行元：Journal of Alzheimer's Disease  

Background: Cognitive impairment is linked to decreased quality of life (QOL), but few studies have investigated the impact of comorbid sarcopenia. Objective: The aim of this study was to elucidate the association of sarcopenia with QOL in patients with early dementia and mild cognitive impairment. Methods: Individuals with a Clinical Dementia Rating of 0.5 or 1 and a Mini-Mental State Examination score of 20-30 underwent a battery of neuropsychological assessments administered by a group of well-trained clinical psychologists. The EQ-5D was completed by both the patients and their main caregivers. EQ-5D utility and visual analog scale scores were measured. Sarcopenia was defined according to the criteria published in the 2019 consensus update by the Asian Working Group for Sarcopenia. Results: Patients with sarcopenia had significantly lower scores on the Digit Symbol Substitution Test and Trail Making Test Part A. There was a significant negative association between sarcopenia and both self- and proxy-rated EQ-5D utility scores independent of potential confounding factors. However, there was no association between QOL visual analog scale scores and sarcopenia. Conclusion: Given that sarcopenia is often found in individuals with cognitive impairment, early detection by timely screening and effective intervention may help to maintain or improve QOL in this population. However, this study could not determine whether reduced QOL is a direct consequence of sarcopenia.

DOI： 10.3233/JAD-200169

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記述言語：日本語   出版者・発行元：Psychogeriatrics  

DOI： 10.1111/psyg.12444

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記述言語：日本語   出版者・発行元：Peptides  

Orexin-A is a neuropeptide mainly produced by hypothalamic neurons with functions in the central nervous system such as regulation of the sleep-wake cycle. Recent studies suggest that orexin-A also plays major roles in peripheral tissues. Although a few studies have reported a role for the kidney in the dynamics of orexin-A, little is known about the association between plasma orexin-A-like immunoreactivity (orexin-A-LI) levels and renal function. We evaluated this association, and also explored other clinical characteristics associated with plasma orexin-A-LI levels. In this cross-sectional study, we included 70 consecutive patients aged ≥65 years admitted to the geriatric ward of Nagoya University Hospital from December 2017 to January 2018. Patients taking suvorexant (an orexin receptor antagonist) were excluded. On hospital days 2–4, fasting blood was collected in the morning. We evaluated associations between plasma orexin-A-LI levels and renal function and other clinical characteristics. Renal function was evaluated in two ways: the estimated glomerular filtration rate (eGFR) using serum creatinine, and estimated creatinine clearance (eCrCl) using the Cockroft-Gault formula. Pearson's correlation coefficient revealed that plasma orexin-A-LI levels were negatively correlated with the eGFR (r = −0.351, p = 0.003) and eCrCl (r = −0.342, p = 0.004). There were no significant associations between plasma orexin-A-LI levels and the primary diagnosis, body mass index, duration of fasting, or other clinical characteristics. In conclusion, plasma orexin-A-LI levels were negatively correlated with renal function in patients in a geriatric ward. Renal function may affect the study design and data interpretation in studies of plasma orexin-A-LI.

DOI： 10.1016/j.peptides.2019.170092

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記述言語：日本語  

DOI： 10.1186/s41479-018-0046-5

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記述言語：日本語   出版者・発行元：一般社団法人 日本老年医学会  

<p><b>目的：</b>高齢糖尿病患者では重症低血糖を来しやすいという特徴があり，高齢者では重症低血糖が，死亡や心血管疾患，認知症などのリスクになりうると報告されている．こうした背景をもとに日本糖尿病学会と日本老年医学会の合同委員会が設置され，2016年5月に高齢者糖尿病の血糖コントロール目標（以下コントロール目標と略す）が提言された．しかしながら高齢者糖尿病の血糖コントロールの実態に関する報告は少なく，我々はコントロール目標の提言がされる以前の高齢者糖尿病の血糖コントロールの状況について検討した．<b>方法：</b>2015年4月1日から2016年3月31日までに名古屋大学医学部附属病院老年内科に入院した65歳以上の患者を対象に，入院時に糖尿病治療薬を投与されている患者を抽出した．コントロール目標をもとに，入院時に投与されていた糖尿病治療薬と認知機能，BADL，IADLでカテゴリー分けを行い，HbA1cを調べた．<b>結果：</b>期間中の当科入院患者は426例であり，そのうち入院時に糖尿病治療薬を投与されており，HbA1c，従前の認知機能やADLに基づきコントロール目標カテゴリーに分類ができた症例は63例であった．性別は男性35例，年齢は83.1±5.9歳，HbA1cは7.6±1.5%であった．カテゴリー該当数はIが10例（15.9%），IIが12例（19.0%），IIIが41例（65.1%）であり，重症低血糖が危惧される薬剤（以下危惧薬と略す）はカテゴリーIが6例（60.0%），IIが8例（66.7%），IIIが22例（53.7%）で使用されていた．危惧薬使用群ではHbA1cが有意に高値であったが，その他の臨床的特徴とは有意な関連を認めなかった．危惧薬が使用されている場合，33.3%の症例でHbA1cが目標値未満であった．<b>結論：</b>危惧薬の使用と，カテゴリー分類や年齢との間には有意な関連を認めなかった．また危惧薬が使用されている場合，33.3%もの症例でHbA1cが目標値未満であった．高齢糖尿病患者では，特に危惧薬が使用されている際には低血糖に注意が必要であり，投薬内容の見直しなどの配慮が必要である．</p>

DOI： 10.3143/geriatrics.54.531

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