Korean Mini-Mental State Examination Research Articles

Pain and cognitive function in Korean older adults aged 60 years or more: A retrospective longitudinal study.

To elucidate the relationship between pain and cognitive decline in adults aged ≥60 years using data from the Korean Longitudinal Study of Aging survey. We included 3,287 older adults aged ≥60 years with a Korean Mini-Mental State Examination score ≥24. We assessed the presence of pain and pain interference using self-administered questionnaires. Pain interference was determined based on whether the pain limited the participants' activities of daily living. According to this assessment, participants were categorized as no pain, low-impact pain, and high-impact pain. Cognitive function was assessed using the Mini-Mental State Examination and classified into 3 groups: normal, cognitive impairment, and suspected dementia. Potential confounding factors, including pain × survey year, were adjusted in the analyses. We also performed subgroup analyses of participants experiencing pain to elucidate the association between pain interference, suspected dementia, and cognitive impairment. A significant difference in the Mini-Mental State Examination scores was observed between individuals with and without pain (P < .001). Pain remained negatively associated with the Mini-Mental State Examination score through the first to the eighth wave even after adjusting for confounding factors (β = -1.170, 95 % confidence interval (CI): -0.243, -0.097). Compared to the absence of pain, the presence of pain increased the odds of suspected dementia and cognitive impairment by approximately 1.6 and 1.4 times, respectively (odds ratio [OR] = 1.56, 95% CI: 1.26, 1.93; OR = 1.36, 95% CI: 1.20, 1.54). Compared to low-impact pain, high-impact pain increased the odds of suspected dementia and cognitive impairment by approximately 2.1and 1.5 times, respectively (OR = 2.12, 95% CI: 1.76, 2.56; OR = 1.47, 95% CI: 1.31, 1.65). Pain was negatively associated with Mini-Mental State Examination scores in Korean older adults aged ≥60 years and increased the odds of suspected dementia and cognitive impairment. Furthermore, individuals with high-impact pain exhibited higher risks of both suspected dementia and cognitive impairment than those with low-impact pain.

The Efficacy of a Home-Based, Augmented Reality Dual-Task Platform for Cognitive-Motor Training in Elderly Patients: A Pilot Observational Study.

This study introduces a novel home-based dual-task platform incorporating augmented reality (AR), COGNIMO, aimed at simultaneously enhancing cognition and physical abilities. The purpose of this study was to assess the effectiveness of this intervention in enhancing cognitive and physical abilities in elderly individuals with subjective cognitive decline, mild cognitive impairment (MCI), and mild Alzheimer's dementia. A 12-week observational study enrolled 57 participants aged 60-85 years. Primary outcomes included changes in cognitive scores (Korean Mini-Mental State Examination, 2nd edition [K-MMSE-2] and Korean-Montreal Cognitive Assessment [K-MoCA]), while secondary outcomes measured physical parameters and depression scores between baseline and week 12 in the active and the control groups. Of 57 participants, 49 completed the study. The active group (≥12 sessions) exhibited significant improvement in K-MoCA compared to the control group (<12 sessions) (p=0.004), while K-MMSE-2 score changes showed no significant difference (p=0.579). Positive correlations between training sessions and K-MoCA changes were observed (r=0.31, p=0.038), emphasizing a dose-response relationship. Subgroup analyses revealed a distinction in cognitive changes, particularly in the MCI group. The COGNIMO platform showed positive effects on cognitive function in MCI patients, suggesting potential benefits for this population. The study highlights the potential of AR-integrated home-based interventions for cognitive enhancement in elderly individuals, underlining the need for further trials in the future.

Association between frailty and cognitive status among ambulating Korean elderly: An observational study.

We aimed to determine the association between frailty and cognitive status of the elderly population in Korea. We examined data from 9920 elders who participated in the 2020 Survey of Living Conditions and Welfare Needs of Korean Older Persons. Frailty was assessed using the Korean version of the Fatigue, Resistance, Ambulation, Illnesses, and Weight Loss scale. The Korean mini-mental status examination was used to test cognitive function. Several logistic regression analysis was performed, with correction for several confounding variables (socioeconomic, health behavior, psychological characteristics, and functional status), to evaluate the relationship between frailty and cognitive state. Of the elderly population in Korea, 1451 (14.6%) were frail and 5977 (60.3%) were pre-frail. Compared to the non-frail group (20.3%), cognitive impairment was considerably higher in the pre-frail (33.1%) and frail (39.8%) groups. When compared to the non-frail group, cognitive impairment was substantially linked to a higher risk of frailty after adjustment (pre-frail odds ratio [OR]: 1.66, 95% confidence interval [CI]: 1.47-1.88; frail OR: 2.00, 95% CI: 1.68-2.37). When cognitive impairment and frailty subcomponents were present, there was a higher likelihood of severe resistance (OR: 1.89; 95% CI: 1.70-2.11) and ambulation (OR: 1.46, 95% CI: 1.32-1.63) issues. Frailty is associated with cognitive impairment.

Effects of Exercise on Urinary AD7c-NTP (Alzheimer-Associated Neuronal Thread Protein) Levels and Cognitive Function Among Active Korean Elderly: A Randomized Controlled Trial.

Alzheimer-associated neuronal thread protein (AD7c-NTP) has been demonstrated to have high diagnostic accuracy in differentiating Alzheimer's disease (AD) patients from healthy individuals. However, it is yet unclear whether exercise can lower the level of AD7c-NTP in urine among active Korean elderly. To assess the effect of exercise on AD7c-ntp levels in urine and cognitive function among active Korean elderly. In total, 40 Korean elderly (≥65 years) were divided into Active Control group (CG, n = 10), Aerobic exercise group (AG, n = 18), and combined Resistance/Aerobic exercise group (RAG, n = 12). A total of 12 weeks of exercise intervention was implemented. At week 0 and 12, cognitive performance (Korean Mini-Mental State Examination, Korean-Color Word Stroop test), grip strength, and body composition (muscle mass and body fat percentage) were measured. Also, a morning urine sample was obtained from each subject. The level of AD7c-NTP was measured using competitive enzyme-linked immunosorbent assay (ELISA). After 12 weeks of exercise intervention, there was a significant difference of AD7c-NTP levels between RAG and CG (p = 0.026), AG and CG (p = 0.032), respectively. Furthermore, the AD7c-NTP levels in urine showed negative correlation with K-MMSE scores (r = -0.390, p = 0.013) and grip strength (r = -0.376, p = 0.017), among all participants after exercise intervention. This is the first study to investigate urine biomarker through exercise intervention. In future stuides, participants who have low cognitive function and low activity levels need to be recruited to observe more significant 'Exercise' effect.

Prediction of Treatment Response and Effect on Clinical Manifestations for Normal Pressure Hydrocephalus of Sleep Related Breathing Disorders

Objectives: Sleep disorders and normal pressure hydrocephalus (NPH) are increasingly important issues observed in neurological disorders. However, the correlation between these diseases has not been sufficiently studied. Thus, we discuss the correlation between sleep disorders and the clinical features of NPH. Methods: Overall, 40 patients with idiopathic NPH were included in the study. To evaluate the sleep disorders and psychiatric problems, surveys were administered, including the 36-Item Short Form Survey, Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Insomnia Severity Index (ISI), Berlin Questionnaire, STOP-Bang Questionnaire, Hospital Anxiety and Depression Scale (HADS), Morningness-Eveningness Questionnaire, and the REM Sleep Behavior Disorder Screening Questionnaire. To evaluate the severity of dementia and ataxia, all of the patients completed the Korean mini-mental state examination; Korea frontal assessment battery score, amd unified Parkinson’s disease rating scale-motor scores before and after cerebrospinal fluid (CSF) drainage. The Pearson’s chi-square test, independent Student’s t-test, Mann–Whitney U test, and linear regression analysis were used to analyze the relationship between sleep disorders and symptom improvement after CSF drainage. Results: Of the 40 patients, 21 patients had poor sleep quality (PSQI&gt;5), 8 patients had insomnia (ISI≥8), 11 patients had daytime sleepiness (ESS≥11), 9 (STOP-Bang≥3) to 13 (Berlin≥2 categories) patients had sleep apnea, 13 patients were anxious (HAS≥8), and 27 patients were depressed (HDS≥8). A linear regression analysis showed that sleep apnea was significantly correlated with cognitive function, and insomnia was correlated with cognitive, motor, and frontal lobe functions. Additionally, patients with severe sleep apnea demonstrated a greater recovery of cognitive function after CSF drainage. Conclusions: Obstructive sleep apnea (OSA) is closely related to the clinical symptoms and treatment effectiveness of NPH. The diagnosis and proper treatment of OSA is expected to improve the prognosis of patients with NPH.

Factors associated with age-related changes in oral diadochokinesis and masticatory function in healthy old adults

BackgroundThis cross–sectional study aimed to identify factors associated with age-related changes in masticatory performance (MP) and oral diadochokinesis (ODK) and to provide normal values in healthy old adults for the diagnosis of oral frailty.MethodsA total of 385 participants were divided into three age groups (Gr1-3): 20–64 years, 65–74 years, and ≥ 75 years. To investigate tongue-lip motor function, ODK was assessed as the number of repetitions of the monosyllables /pa/ta/ka/. Four questionnaires were used to assess subjective masticatory ability, cognitive ability, and psychological status. MP, bite force, and occlusal area were tested to assess dynamic objective masticatory function, and the number of remaining teeth and functional tooth pairs were determined to assess static objective masticatory function. Handgrip strength (HG), oral dryness, and tongue pressure (TP) were assessed to identify influencing factors. Intergroup differences were evaluated by ANOVA and the Kruskal‒Wallis test, and correlations between ODK and orofacial factors were evaluated.ResultsThis study revealed significant age-related declines in TP, HG, and ODK, especially after 65 years of age. Factors affecting MP were posterior teeth, the Eichner index, bite force, occluding area, the Korean Mini-Mental State Examination (KMMSE) score, and ODK. Each ODK syllable was associated with different factors, but common factors associated with ODK were MP, HG, and PHQ-9 score. For the syllables /pa/ta/, the Eichner Index, TP, and oral dryness were also associated. For the syllable /ka/ in Gr3, MP, TP, HG, oral dryness, and the KMMSE score were associated.ConclusionsThese results could provide practical guidelines for oral rehabilitation in old adults and contribute to improving the understanding of age-related changes in oral function and the multidimensional nature of masticatory dynamics.

Evaluating the Validity and Reliability of the Korean Version of the Scales for Outcomes in Parkinson's Disease-Cognition.

The Scales for Outcomes in Parkinson's Disease-Cognition (SCOPA-Cog) was developed to assess cognition in patients with Parkinson's disease (PD). In this study, we aimed to evaluate the validity and reliability of the Korean version of the SCOPACog (K-SCOPA-Cog). We enrolled 129 PD patients with movement disorders from 31 clinics in South Korea. The original version of the SCOPA-Cog was translated into Korean using the translation-retranslation method. The test-retest method with an intraclass correlation coefficient (ICC) and Cronbach's alpha coefficient were used to assess reliability. Spearman's rank correlation analysis with the Montreal Cognitive Assessment-Korean version (MOCA-K) and the Korean Mini-Mental State Examination (K-MMSE) were used to assess concurrent validity. The Cronbach's alpha coefficient was 0.797, and the ICC was 0.887. Spearman's rank correlation analysis revealed a significant correlation with the K-MMSE and MOCA-K scores (r = 0.546 and r = 0.683, respectively). Our. demonstrate that the K-SCOPA-Cog has good reliability and validity.

Sex Differences in the Impact of Dynapenic Abdominal Obesity on Mild Cognitive Impairment among Korean Elderly in the Community.

Abdominal obesity (AO) and dynapenia (DP) are associated with cognitive decline, and the relationship between dynapenic abdominal obesity (DAO), a combination of DP and AO, and mild cognitive impairment (MCI) has been confirmed. This study aims to determine whether this relationship exhibits potential sex differences. The relationship between MCI and DAO was confirmed in 1309 community elderly individuals aged 65 years or older who were not diagnosed with dementia. The MCI was defined as a Korean mini-mental state examination (K-MMSE) score of 18-23 points. Multiple logistic regression analyses were conducted, categorizing participants into groups: a control group without AO or DP, an AO group, a DP group, and a DAO group. The study results showed that in women, both DP and DAO were significantly associated with MCI not only in the unadjusted Model 1 but also in Model 2, which adjusted for general characteristics and health behaviors, and Model 3, which additionally adjusted for chronic diseases and disease-related characteristics. In men, DP was associated with MCI in the unadjusted Model 1. The findings highlight sex differences in the impact of the DAO on MCI. These differences should be considered when studying the factors related to MCI in old age.

A Pilot Trial of Integrative Medicine for Stroke Rehabilitation: Expert Recommendations for the Development and Sustainability of Integrative Medicine

Background: Strategies towards development and sustainability of integrative treatment in stroke rehabilitation medicine are needed. National expert recommendations based on the implementation of Integrative Medicine (IM) in stroke rehabilitation and IM outcomes would be invaluable.Methods: A pilot study was performed and the effectiveness of combining Korean traditional medicine and Western conventional medicine in post-stroke patients (ischemic stroke &lt;i&gt;n&lt;/i&gt; = 15 and hemorrhagic stroke &lt;i&gt;n&lt;/i&gt; = 4) was evaluated, and recommendations were developed through consensus with physicians in national centers of rehabilitative medicine. Outcome measures [Korean Modified Barthel Index (K-MBI), Korean Mini Mental State Examination (K-MMSE), Modified Rankin Scale (mRS), and EuroQol 5-dimension 5-level (EQ-5D-5L) assessment were used at baseline, 4, 8 (K-MBI, K-MMSE, mRS, and EQ-5D-5L) and 12 weeks post treatment (EQ-5D-5L and mRS).Results: Improvements were observed in functional and cognitive abilities at 8 weeks (K-MBI score &lt;i&gt;p&lt;/i&gt; = 0.0062; K-MMSE score &lt;i&gt;p&lt;/i&gt; = 0.046). Quality of life improvements (EQ-5D-5L) were observed but were not statistically significant. The disability assessment (mRS) indicated a gradual improvement from baseline to 12 weeks. No adverse events were reported. For effective, patient-centered IM treatment: (1) build a strong evidence base for IM as compared with Western medicine alone or traditional medicine alone; (2) active expert collaboration; (3) IM promotion in public medical institutions; and (4) continued government support.Conclusion: Functional and cognitive abilities of stroke patients statistically significantly improved following 8 weeks of IM treatment. Strategies have been suggested towards the development and sustainability of IM treatment in stroke rehabilitation medicine.

Long-Term Functional Outcome in Patients With Isolated Thalamic Stroke: The KOSCO Study.

Information on the long-term prognosis in patients with isolated thalamic stroke is sparse. We report the functional outcomes of patients with thalamic stroke up to 24 months from the KOSCO (Korean Stroke Cohort for Functioning and Rehabilitation) study. Isolated thalamic stroke was defined as the presence of lesions solely in the thalamus, excluding cases with lesions in other brain parenchyma areas apart from the thalamus, as identified by brain magnetic resonance imaging or computed tomography scans. The Fugl-Meyer Assessment, the Functional Ambulatory Category, the Korean Mini-Mental State Examination, the American Speech-Language-Hearing Association National Outcome Measurement System Swallowing Scale, and the short version of the Korean Frenchay Aphasia Screening Test were used to assess physical impairment. The Functional Independence Measure and modified Rankin Scale were used to assess functional outcomes. All measurements were conducted up to 24 months poststroke. A total of 297 patients were included, consisting of 235 with ischemic and 62 with hemorrhagic stroke. Except for the Functional Ambulatory Category and Functional Independence Measure, all physical impairments showed significant improvement up to 3 months poststroke (P<0.001) and reached a plateau. The Functional Ambulatory Category and Functional Independence Measure scores continued to improve up to 12 months poststroke (P<0.05) and reached a plateau. At 7 days poststroke, 47.5% of patients had no disability (modified Rankin Scale score<2), whereas at 24 months poststroke, 76.4% of patients had no significant disability. Patients showed rapid recovery from physical impairment up to 3 months poststroke, with additional improvements in ambulatory function and independence observed up to 12 months poststroke. Additionally, relatively favorable long-term functional prognosis at 24 months after onset was demonstrated. These results could provide insights into the proper management regarding functional outcomes of patients with isolated thalamic stroke.

A screening method for mild cognitive impairment in elderly individuals combining bioimpedance and MMSE.

We investigated a screening method for mild cognitive impairment (MCI) that combined bioimpedance features and the Korean Mini-Mental State Examination (K-MMSE) score. Data were collected from 539 subjects aged 60 years or older at the Gwangju Alzheimer's & Related Dementias (GARD) Cohort Research Center, A total of 470 participants were used for the analysis, including 318 normal controls and 152 MCI participants. We measured bioimpedance, K-MMSE, and the Seoul Neuropsychological Screening Battery (SNSB-II). We developed a multiple linear regression model to predict MCI by combining bioimpedance variables and K-MMSE total score and compared the model's accuracy with SNSB-II domain scores by the area under the receiver operating characteristic curve (AUROC). We additionally compared the model performance with several machine learning models such as extreme gradient boosting, random forest, support vector machine, and elastic net. To test the model performances, the dataset was divided into a training set (70%) and a test set (30%). The AUROC values of SNSB-II scores were 0.803 in both sexes, 0.840 for males, and 0.770 for females. In the combined model, the AUROC values were 0.790 (0.773) for males (and females), which were significantly higher than those from the model including MMSE scores alone (0.723 for males and 0.622 for females) or bioimpedance variables alone (0.640 for males and 0.615 for females). Furthermore, the accuracies of the combined model were comparable to those of machine learning models. The bioimpedance-MMSE combined model effectively distinguished the MCI participants and suggests a technique for rapid and improved screening of the elderly population at risk of cognitive impairment.

Is the Korean Mini-Mental State Examination (K-MMSE) Useful in Evaluating the Cognitive Function of Brain Injury Patients?: Through Correlation Analysis With Computerized Neurocognitive Test (CNT).

Patients with brain injury often experience accompanying disabilities that can make it challenging for them to use tools or perform complex tests. Therefore, Korean Mini-Mental State Examination (K-MMSE) is widely used in clinical practice as an alternative to the computerized neurocognitive test (CNT) or Wechsler Adult Intelligence Scale tests to assess cognitive function in these individuals. This study aimed to investigate the correlation between the K-MMSE and CNT in brain injury patients to evaluate the and clinical usefulness of K-MMSE. A total of 120 patients were assessed using both tests, and a significant correlation was observed between the total scores of K-MMSE and CNT. The orientation component of K-MMSE was significantly correlated with CNT components, indicating that individuals who perform well on orientation tasks are likely to have better cognitive abilities overall. While K-MMSE has limitations in evaluating specific cognitive domains, it is a useful tool in clinical practice for evaluating cognitive impairment, especially in patients who have difficulty using more complex cognitive tests.

A Comparison of Item Characteristics and Test Information Between the K-MMSE~2:SV and K-MMSE.

The Korean-Mini Mental State Examination, 2nd edition (K-MMSE~2) was recently released. This study aimed to determine whether the K-MMSE~2: Standard Version (K-MMSE~2:SV) had the same test characteristics as the K-MMSE. A total of 1,514 healthy community-based participants aged 19 to 90 years were administered the K-MMSE~2:SV Blue Form along with the language items from the K-MMSE. The item and test characteristics and test information for the K-MMSE~2:SV and K-MMSE were compared using Item Response Theory analysis. Item discriminations for the K-MMSE~2:SV and K-MMSE were above the moderate range for all items except Recall. Most of the items on the K-MMSE~2:SV and K-MMSE had item category difficulty in the very easy or easy range. The test information curve (TIC) showed that the K-MMSE~2:SV and K-MMSE provide almost the same amount of information (27.86 vs. 28.44), with both tests providing the most information at an ability level of -1.57. The generalizability (G) coefficient for the K-MMSE~2:SV and K-MMSE was 0.99. These results indicate that the K-MMSE~2:SV and K-MMSE are equally optimal tests for screening for mild cognitive impairment and early dementia. Given that the amount of test information provided by the two tests was almost identical, the shapes of the TICs were very similar, and the G coefficient was close to 1, we can conclude that the K-MMSE and K-MMSE~2:SV are equivalent tests.

Aging-related Differences in Emotional Valence from the Verb Fluency Task Depending on the Time Period

Objectives: The purpose of this study was to identify differences between younger and older adults in emotional valence (EV) of words produced during the first and second halves of a 1-minute verb fluency (VF) task. We also sought to determine the relationships between EV, demographic information, VF performance, working memory (WM), and Korean-Mini Mental State Examination (K-MMSE).Methods: A total of 62 healthy individuals participated in the study, with 31 individuals in each age group. A VF-task was conducted for a 1-minute window. The ratios of positive or negative verbs were calculated for the first and second halves of the task period. Digit forward and backward tests were administered and treated as a single index of WM capacity.Results: Both groups produced significantly more positive-EV words than negative, and in the first 30s compared to last 30s. The older adults produced significantly more positive-EV words in the first 30s than the younger group. The positive-EV ratio of verbs in the first 30s showed a significant negative correlation with task performance, K-MMSE, and WM measure. It also showed significant positive correlation with participants’ age.Conclusion: The current study indicates a significant decline in word production rate over time, and a tendency of easily producing positive-EV words in both group. Furthermore, the study revealed the elderly’s positivity effect on task performance. Lastly, using more positive-EV words in the early period of task tendency was significantly and negatively correlated with the task performance, WM measures, and K-MMSE.

Association between Vitamin D and Short-Term Functional Outcomes in Acute Ischemic Stroke

Vitamin D (Vit D) affects musculoskeletal performance and central nervous system neuroprotection. We aimed to investigate the association between serum Vit D levels and short-term functional outcomes in patients with acute ischemic stroke. This study involved patients with acute ischemic stroke confirmed on brain MRI. The National Institutes of Health Stroke Scale (NIHSS) was used to assess initial stroke severity upon admission. We evaluated the functional outcomes using the Berg Balance Scale (BBS), Manual Function Test (MFT), Korean Mini-Mental State Examination (K-MMSE), Korean version of the modified Barthel Index (K-MBI) within three weeks from the onset of stroke, and modified Rankin Scale (mRS) score at discharge. Overall, 192 patients were finally included and divided into three groups: Vit D sufficient (n = 28), insufficient (n = 49), and deficient (n = 115). Multivariate analysis showed that the Vit D deficient group presented with a higher risk of initially severe stroke (p = 0.025) and poor functional outcomes on the BBS (p = 0.048), MFT (p = 0.017), K-MMSE (p = 0.001), K-MBI (p = 0.003), and mRS (p = 0.032) compared to the Vit D sufficient group. Vit D deficiency may be associated with severe initial stroke and poor short-term post-stroke functional outcomes.

A Case Report of a Patient with Vascular Dementia Caused by Intracerebral Hemorrhage Treated with Modified &lt;italic&gt;Guibi-tang&lt;/italic&gt;

Objectives: The aim of this study is to describe the effects of traditional Korean medicine treatment on a patient with vascular dementia caused by an intracerebral hemorrhage.Methods: The patient was treated with herbal medicine (&lt;i&gt;modified Guibi-tang&lt;/i&gt;) and acupuncture. The effects of these treatments were evaluated using the Korean Mini Mental Status Examination (K-MMSE-2), Cognitive Dementia Rating (CDR), Manual Muscle Test (MMT), Korean version of Modified Barthel Index (K-MBI), and Videofluoroscopic Swallow Study (VFSS).Results: After treatment, the K-MMSE-2 score, CDR score, MMT, K-MBI, and VFSS improved.Conclusion: The results suggest that traditional Korean medicine may be effective for the symptoms of vascular dementia caused by intracerebral hemorrhage.

Trajectories of Cognitive Function and Their Associated Factors in Community-Dwelling Older Adults by Living Arrangement Using the Korean Longitudinal Study of Aging

The purpose of this study was to describe the distinct cognitive trajectories for 8 years according to living arrangement among community-dwelling older adults using the Korean longitudinal study of ageing.We analyzed data from a final sample of 3,049 community-dwelling older adults aged 65 years or older who participated in at least three cognitive function measures in an 8-year period (2012-2020). Cognitive function was assessed by Korean mini mental state examination. Latent class growth model analysis was applied to determine the number and shape of trajectories of older adults according to living arrangement. Multinomial logistic regression analysis was used to determine risk factors for cognitive function trajectories.We identified five trajectory patterns in cognitive function among older adults living alone; ‘high-stable (35.6%)’, ‘high-declining (32.5%)’, ‘moderate-steep declining (6.2%)’, ‘low-stable (18.9%)’, and ‘low declining (6.8%)’. In older adults living with family, there were four trajectory patterns; ‘high-stable (46.4%)’, ‘high-declining (32.0%)’, ‘low-stable (15.9%)’, and ‘low-declining (5.7%)’. Age, instrumental activities of daily living, and depression were common factors of cognitive changes in both older adults living alone and those living with family members. However, monthly incomes was only associated with the risk of cognitive function in older adults living alone.We found that cognitive function trajectories among older adults may differ depending on the type of living arrangement. Therefore, further studies and health policies are required for avoiding cognitive impairment by living arrangement among older adults based on the results of this study.

Malnutrition and Associated Factors in Acute and Subacute Stroke Patients with Dysphagia.

Most patients with stroke suffer from complications and these include dysphagia. Dysphagia can cause malnutrition, and malnutrition affects prognosis and recovery. However, there is a lack of accurate studies on the nutritional status of stroke patients with dysphagia and its associated factors in different phases of stroke. This study retrospectively investigated 620 stroke patients who underwent a videofluoroscopic swallowing study (VFSS) due to dysphagia, from March 2018 to February 2021. The study aimed to evaluate the nutritional state and associated factors of malnutrition in acute and subacute stroke patients with dysphagia. Serum albumin and percentage of current weight to ideal weight were used to determine nutritional status. Malnutrition was observed in 58.9 and 78.9% of acute and subacute stroke patients. Exact logistic regression analysis revealed that old age and high penetration-aspiration scale score were significantly associated factors for malnutrition in patients with acute stroke. Old age, stroke history, bilateral hemiplegia, high modified Rankin score, low Korean Mini-Mental State Examination, pneumonia, and high functional dysphagia score were significantly associated factors for malnutrition in patients with subacute stroke. Patients with these associated factors in each phase of stroke require active nutritional assessment and care to decrease the risk of malnutrition.

Comparative study of young-old and old-old people using functional evaluation, gait characteristics, and cardiopulmonary metabolic energy consumption

BackgroundWalking is an important factor in daily life. Among older adults, gait function declines with age. In contrast to the many studies revealing gait differences between young adults and older adults, few studies have further divided older adults into groups. The purpose of this study was to subdivide an older adult population by age to identify age-related differences in functional evaluation, gait characteristics and cardiopulmonary metabolic energy consumption while walking.MethodsThis was a cross-sectional study of 62 old adult participants who were classified into two age groups of 31 participants each as follows: young-old (65–74 years) and old-old (75–84 years) group. Physical functions, activities of daily living, mood state, cognitive function, quality of life, and fall efficacy were evaluated using the Short Physical Performance Battery (SPPB), Four-square Step Test (FSST), Timed Up and Go Test (TUG), Korean Version of the Modified Barthel Index, Geriatric Depression Scale (GDS), Korean Mini-mental State Examination, EuroQol-5 Dimensions (EQ-5D) questionnaire, and the Korean version of the Fall Efficacy Scale. A three-dimensional motion capture system (Kestrel Digital RealTime System®; Motion Analysis Corporation, Santa Rosa, CA, USA) and two force plates (TF-4060-B; Tec Gihan, Kyoto, Japan) were used to investigate spatiotemporal gait parameters (velocity, cadence, stride length, stride width, step length, single support, stance phase, and swing phase), kinematic variables (hip, knee, and ankle joint angles), and kinetic variables (hip, knee, and ankle joint moment and power) of gait. A portable cardiopulmonary metabolic system (K5; Cosmed, Rome, Italy) was used to measure cardiopulmonary energy consumption.ResultsThe old-old group showed significantly lower SPPB, FSST, TUG, GDS-SF, and EQ-5D scores (p < 0.05). Among spatiotemporal gait parameters, velocity, stride length, and step length were significantly lower in the old-old group than in the young-old group (p < 0.05). Among the kinematic variables, the knee joint flexion angles during initial contact and terminal swing phase were significantly higher in the old-old than the young-old group (P < 0.05). The old-old group also showed a significantly lower ankle joint plantarflexion angle during the pre- and initial swing phases (P < 0.05). Among the kinetic variables, the hip joint flexion moment and knee joint absorption power in the pre-swing phase were significantly lower in the old-old than the young-old group (P < 0.05).ConclusionThis study demonstrated that participants 75–84 years of age had less functional gaits than their young-old counterparts (65–74 years old). As the walking pace of old-old people diminishes, driving strength to move ahead and pressure on the knee joint also tend to decrease together with stride length. These differences in gait characteristics according to age among older adults could improve our understanding of how aging causes variations in gait that increase the risk of falls. Older adults of different ages may require customized intervention plans, such as gait training methods, to prevent age-related falls.Trial registrationClinical trials registration information: ClinicalTrials.gov Identifier: NCT04723927 (26/01/2021).

The effects of low-dose radiation therapy in patients with mild-to-moderate Alzheimer's dementia: an interim analysis of a pilot study.

We aimed to determine whether low-dose radiotherapy (LDRT) is effective in patients with Alzheimer disease (AD). We included patients according to the following criteria: probable Alzheimer's dementia according to the New Diagnostic Criteria for Alzheimer's Disease; confirmation of amyloid plaque deposits on baseline amyloid positron emission tomography (PET); a Korean Mini-Mental State Examination 2nd edition (K-MMSE-2) score of 13-26; and a Global Clinical Dementia Rating (CDR) score of 0.5-2 points. LDRT was performed six times at 0.5 Gy each. Post-treatment cognitive function tests and PET-CT examinations were performed to evaluate efficacy. The medication for AD treatment was maintained throughout the study period. At 6 months after LDRT, neurological improvement was seen in 20% of patients. Patient #2 showed improvement in all domains of the Seoul Neuropsychological Screening Battery II (SNSB-II). Moreover, the K-MMSE-2 and Geriatric Depression Score-Short Form scores improved from 20 to 23 and from 8 to 2, respectively. For patient #3, the CDR score (sum of box score) improved from 1 (4.0) to 1 (3.5) at 3 months follow-up. Moreover, the Z scores for language and related functions, memory, and frontal executive function improved to -2.56, -1.86, and -1.32, respectively at the 6-month follow-up. Two patients complained of mild nausea and mild hair loss during LDRT, which improved after treatment. One of the five patients with AD treated with LDRT experienced a temporary improvement in SNSB-II. LDRT is tolerable in patients with AD. We are currently under follow-up and will conduct cognitive function tests after 12 months after LDRT. A large-scale randomized controlled trial with a longer follow-up period is warranted to determine the effect of LDRT on patients with AD.