Longitudinal Observational Study Research Articles

Predicting Driving Cessation Among Cognitively Normal Older Drivers: The Role of Alzheimer Disease Biomarkers and Clinical Assessments.

With the aging US population and increasing incidence of Alzheimer disease (AD), understanding factors contributing to driving cessation among older adults is crucial for clinicians. Driving is integral for maintaining independence and functional mobility, but the risk factors for driving cessation, particularly in the context of normal aging and preclinical AD, are not well understood. We studied a well-characterized community cohort to examine factors associated with driving cessation. This prospective, longitudinal observation study enrolled participants from the Knight Alzheimer Disease Research Center and The DRIVES Project. Participants were enrolled if they were aged 65 years or older, drove weekly, and were cognitively normal (Clinical Dementia Rating [CDR] = 0) at baseline. Participants underwent annual clinical, neurologic, and neuropsychological assessments, including β-amyloid PET imaging and CSF (Aβ42, total tau [t-Tau], and phosphorylated tau [p-Tau]) collection every 2-3 years. The primary outcome was time from baseline visit to driving cessation, accounting for death as a competing risk. The cumulative incidence function of driving cessation was estimated for each biomarker. The Fine and Gray subdistribution hazard model was used to examine the association between time to driving cessation and biomarkers adjusting for clinical and demographic covariates. Among the 283 participants included in this study, there was a mean follow-up of 5.62 years. Driving cessation (8%) was associated with older age, female sex, progression to symptomatic AD (CDR ≥0.5), and poorer performance on a preclinical Alzheimer cognitive composite (PACC) score. Aβ PET imaging did not independently predict driving cessation, whereas CSF biomarkers, specifically t-Tau/Aβ42 (hazard ratio [HR] 2.82, 95% CI 1.23-6.44, p = 0.014) and p-Tau/Aβ42 (HR 2.91, 95% CI 1.28-6.59, p = 0.012) ratios, were independent predictors in the simple model adjusting for age, education, and sex. However, in the full model, progression to cognitive impairment based on the CDR and PACC score across each model was associated with a higher risk of driving cessation, whereas AD biomarkers were not statistically significant. Female sex, CDR progression, and neuropsychological measures of cognitive functioning obtained in the clinic were strongly associated with future driving cessation. The results emphasize the need for early planning and conversations about driving retirement in the context of cognitive decline and the immense value of clinical measures in determining functional outcomes.

Bone mineral density in adult thalassaemias: a retrospective longitudinal study.

In this study, we aim to evaluate the long-term impact of thalassaemia on bone mineral density (BMD) through sequential analysis, compare changes in BMD values between male and female patients and find any correlation between BMD and biochemical markers in the adult thalassaemia group. BMD is a bone mineral density test using dual-energy X-ray to measure calcium hydroxyapatite per unit of bone, reflecting bone strength. We conducted a longitudinal retrospective observational cohort study to determine the changes in BMD values and biochemical parameters in adult thalassaemia patients. BMD was assessed at the lumbar spine (L1-L4) and proximal femora using Hologic's bone dual-energy X-ray absorptiometry. Five serial BMD values were retrieved from electronic records. Biochemical parameters, including serum calcium, phosphorus and 25-hydroxyvitamin D levels, were also assessed. A total of 108 patients (47 males and 61 females; median age: 44 years) with thalassaemia major 71 patients, intermedia 20 patients, haemoglobin E disease 14 patients and thalassaemia-alpha three patients were included. The incidence of low BMD in patients with thalassaemia increased from 64 to 74% over three decades of analysis. Females and thalassaemia major patients had lower hip BMD values and corresponding Z-scores. There is a progressive decline in BMD values in adult thalassaemia, which was apparent in female thalassaemia major patients. No changes in biochemical parameters, however, were observed over long-term assessments.

Insulin sensitivity, body composition and bone mineral density after testosterone treatment in transgender youth with and without prior GnRH agonist therapy

Background1.8% of youth identify as transgender; a growing proportion are transgender male (female sex, male gender identity). Many receive gonadotropin releasing hormone agonist (GnRHa) therapy to suppress endogenous puberty and/or will start testosterone to induce secondary sex characteristics that align with gender identity. Objective(s)To determine the effects of 12 months of testosterone on cardiometabolic health among transgender youth, including insulin sensitivity, body composition, and bone mineral density and whether changes in outcomes differ based on prior GnRHa treatment. MethodsParticipants (n = 19, baseline age 15.0 ± 1.0 years) were examined prior to and 12 months after testosterone therapy in a longitudinal observational study. Fasted morning blood draw, a 2-hour 75-gram oral glucose tolerance test, body composition and bone mineral density (dual-energy X-ray absorptiometry) were assessed at baseline and 12 months. Insulin sensitivity was estimated by HOMA-IR and Matsuda index. Changes were compared with mixed linear regression models evaluating time (baseline, 12 months), group (GnRHa treatment yes/no), and their interaction. ResultsIn the entire cohort, fasted insulin decreased (median [25,75 %ile]: −3 [-5, 0] mIU/L, p = 0.044) and 2-hour glucose increased (mean ± standard deviation): +18.5 ± 28.9 mg/dL, p = 0.013 from baseline after 12 months of testosterone therapy. There were no significant changes in HOMA-IR (p = 0.062) or Matsuda index (p = 0.096), nor by GnRHa status. Absolute (+6.2 [4.7, 7.5] kg, p = 0.016) and percent fat-free mass increased (+7.3 [5.4, 9.1] %, p = 0.003) and percent fat mass declined (−7.4 [-9.3, 5.3]%, p = 0.005) for the entire cohort. There were time*group interactions for absolute (p = 0.0007) and percent fat-free mass (p = 0.033). There were time*group interactions for bone mineral content (p = 0.006). ConclusionsTwelve months of testosterone in transgender adolescents resulted in changes in body composition and bone mineral density, with baseline differences between the +/-GnRHa group and convergence after 12 months. There were no changes in insulin sensitivity over time or between groups.

Evaluation of surgery -first orthognathic approach in correction of dentofacial skeletal deformities (A longitudinal observational study)

Evaluation of surgery -first orthognathic approach in correction of dentofacial skeletal deformities (A longitudinal observational study)

Effect of CPAP Treatment on Cardiovascular Outcomes

IntroductionRandomized controlled trials (RCT) have not demonstrated a role for continuous positive airway pressure (CPAP) on the secondary prevention of major cardiovascular events in obstructive sleep apnea (OSA) patients. However, participants in RCTs are substantially different from real-world patients. Therefore, we aimed to assess the effect of CPAP treatment on major cardiovascular events in real-world OSA patients. MethodsPopulation-based longitudinal observational study including all OSA patients with an active CPAP prescription at the beginning of 2011 in Catalonia, Spain, that terminated CPAP treatment during 2011 and did not have CPAP prescriptions between 2012-2015; and propensity-score-matched OSA patients that continued CPAP treatment until the end of 2015 or death. Adjusted hazard ratios were used to assess the association between CPAP treatment and overall and cardiovascular mortality, cardiovascular hospitalizations, or major adverse cardiovascular events (MACEs). Results3638 CPAP terminators and 10,914 propensity-score-matched continuators were included (median age 67 [57–77] years, 71.4% male). During a median follow-up of 47.9 months CPAP continuators showed a lower risk of cardiovascular death than terminators (hazard ratio [HR]: 0.61; 95% confidence interval [CI]: 0.50–0.75) after adjusting by age, sex and key comorbidities. Similar results were found for cardiovascular hospitalizations (HR: 0.87; 95% CI: 0.76–0.99) and MACEs (HR: 0.84; 95% CI: 0.75–0.95). ConclusionCPAP treatment continuation could be associated with a significantly lower risk of major cardiovascular events in real-world OSA patients. This result highlights the importance of including real-world patients in studies on OSA.

Tracking and Profiling Repeated Users Over Time in Text-Based Counseling: Longitudinal Observational Study With Hierarchical Clustering.

Due to their accessibility and anonymity, web-based counseling services are expanding at an unprecedented rate. One of the most prominent challenges such services face is repeated users, who represent a small fraction of total users but consume significant resources by continually returning to the system and reiterating the same narrative and issues. A deeper understanding of repeated users and tailoring interventions may help improve service efficiency and effectiveness. Previous studies on repeated users were mainly on telephone counseling, and the classification of repeated users tended to be arbitrary and failed to capture the heterogeneity in this group of users. In this study, we aimed to develop a systematic method to profile repeated users and to understand what drives their use of the service. By doing so, we aimed to provide insight and practical implications that can inform the provision of service catering to different types of users and improve service effectiveness. We extracted session data from 29,400 users from a free 24/7 web-based counseling service from 2018 to 2021. To systematically investigate the heterogeneity of repeated users, hierarchical clustering was used to classify the users based on 3 indicators of service use behaviors, including the duration of their user journey, use frequency, and intensity. We then compared the psychological profile of the identified subgroups including their suicide risks and primary concerns to gain insights into the factors driving their patterns of service use. Three clusters of repeated users with clear psychological profiles were detected: episodic, intermittent, and persistent-intensive users. Generally, compared with one-time users, repeated users showed higher suicide risks and more complicated backgrounds, including more severe presenting issues such as suicide or self-harm, bullying, and addictive behaviors. Higher frequency and intensity of service use were also associated with elevated suicide risk levels and a higher proportion of users citing mental disorders as their primary concerns. This study presents a systematic method of identifying and classifying repeated users in web-based counseling services. The proposed bottom-up clustering method identified 3 subgroups of repeated users with distinct service behaviors and psychological profiles. The findings can facilitate frontline personnel in delivering more efficient interventions and the proposed method can also be meaningful to a wider range of services in improving service provision, resource allocation, and service effectiveness.

Device-assessed physical activity and sleep quality of post-COVID patients undergoing a rehabilitation program

BackgroundAn infection with SARS-CoV-2 can lead to persistent symptoms more than three months after the acute infection and has also an impact on patients’ physical activity behaviour and sleep quality. There is evidence, that inpatient post-COVID rehabilitation can improve physical capacity and mental health impairments, but less is known about the change in physical behaviour and sleep quality.MethodsThis longitudinal observational study used accelerometery to assess the level of physical activity and sleep quality before and after an inpatient rehabilitation program. The study sample consists of 100 post-COVID patients who acquired COVID-19 in the workplace. Group differences related to sex, age, COVID-19 severity, and pre-existing diseases were also analysed.ResultsLevel of physical activity and sleep quality didn’t increase after rehabilitation. Overall, there is a high extent of inactivity time and poor sleep quality at both measurement points. Regarding group differences, male patients showed a significantly higher inactivity time before rehabilitation, and younger patients (< 55 years) spend significant more time in vigorous physical activity than older patients. Post-COVID patients with pre-existing cardiovascular, respiratory, and metabolic disease show slightly less physical activity than post-COVID patients without these comorbidities. Female patients and younger patients showed better sleep quality in some sleep parameters at both measurement points. However, no differences could be detected related to COVID-19 severity.ConclusionsOngoing strategies should be implemented to address the high amount of inactivity time and the poor sleep quality in post-COVID patients.

Cholinesterase inhibitors and memantine are associated with a reduced mortality in nursing home residents with dementia: a longitudinal observational study

BackgroundA large proportion of nursing home (NH) residents suffer from dementia and effects of conventional anti-dementia drugs on their health is poorly known. We aimed to investigate the associations between exposure to anti-dementia drugs and mortality among NH residents.MethodsThis retrospective longitudinal observational study involved 329 French NH and the residents admitted in these facilities since 2014 and having major neurocognitive disorder. From their electronic health records, we obtained their age, sex, level of dependency, Charlson comorbidity index, and Mini mental examination score at admission. Exposure to anti-dementia drugs was determined using their prescription into 4 categories: none, exposure to acetylcholinesterase inhibitors (AChEI) alone, exposure to memantine alone, exposure to AChEI and memantine. Survival until the end of 2019 was studied in the entire cohort by Cox proportional hazards. To alleviate bias related to prescription of anti-dementia drugs, we formed propensity-score matched cohorts for each type of anti-dementia drug exposure, and studied survival by the same method.ResultsWe studied 25,358 NH residents with major neurocognitive disorder. Their age at admission was 87.1 + 7.1 years and 69.8% of them were women. Exposure to anti-dementia drugs occurred in 2,550 (10.1%) for AChEI alone, in 2,055 (8.1%) for memantine alone, in 460 (0.2%) for AChEI plus memantine, whereas 20,293 (80.0%) had no exposure to anti-dementia drugs. Adjusted hazard ratios for mortality were significantly reduced for these three groups exposed to anti-dementia drugs, as compared to reference group: HR: 0.826, 95%CI 0.769 to 0.888 for AChEI; 0.857, 95%CI 0.795 to 0.923 for memantine; 0.742, 95%CI 0.640 to 0.861 for AChEI plus memantine. Results were consistent in propensity-score matched cohorts.ConclusionThe use of conventional anti-dementia drugs is associated with a lower mortality in nursing home residents with dementia and should be widely used in this population.

Maternal Reports of Preterm and Sick Term Infants' Settling, Sleeping and Feeding in the 9 Months after Discharge from Neonatal Nursery: An Observational Study.

The effects of preterm birth, neonatal morbidities and environmental influences on infant sleep development is an important yet under-researched topic, with little known about normative sleep for infants born sick or preterm. The aim of this prospective, observational longitudinal study was to evaluate maternal perceptions and degree of bother with infant sleep behaviours and feeding outcomes across the first 9 months after discharge for sick/preterm infants cared for in the neonatal intensive care unit (NICU) and for healthy term-born infants. This paper reports outcomes for the sick/preterm cohort (I = 94) that were recruited from two NICUs in Perth, Western Australia. Total bother scores were on average 20.2% higher at 9 months than at two weeks post-discharge (p < 0.001). Increased night waking frequency, evening settling duration and crying duration were all positively associated with total bother scores. Maternal confidence scores were negatively associated with maternal bother scores; with each unit increase in confidence, maternal bother decreased by 8.5% (p < 0.001). Covariates such as birth gestation, breastfeeding status and multiple births were not associated with maternal bother. Families may benefit from additional support when experiencing increased night waking frequency and crying and settling durations in the first 9 months after discharge from NICU.

Assessment of Surgical Outcomes in Patients with Degenerative Cervical Myelopathy Using the 25-Question Geriatric Locomotive Function Scale: A Longitudinal Observational Study.

Locomotive syndrome caused by degenerative musculoskeletal diseases is reported to improve with surgical treatment. However, it is unclear whether surgical treatment is effective for the locomotive syndrome developing in patients with degenerative cervical myelopathy (DCM). Thus, this study primarily aimed to longitudinally assess the change in locomotive syndrome stage before and after cervical spinal surgery for patients with DCM using the 25-question geriatric locomotive function scale (GLFS-25). A secondary objective was to identify factors associated with the postoperative improvement in the locomotive syndrome stage. We retrospectively reviewed clinical data of patients undergoing cervical spine surgery at our institution from April 2020 to May 2022 who had answered the Japanese Orthopaedic Association Cervical Myelopathy Assessment Questionnaire, visual analog scale, and GLFS-25 preoperatively and at 6 months and 1 year postoperatively. We collected demographic data, medical history, preoperative radiographic parameters, presence or absence of posterior longitudinal ligament ossification, and surgical data. We enrolled 115 patients (78 men and 37 women) in the present study. Preoperatively, using the GLFS-25, 73.9% of patients had stage 3, 10.4% had stage 2, 9.6% had stage 1, 6.1% had no locomotive syndrome. The stage distribution of locomotive syndrome improved significantly at 6-months and 1-year postoperatively. The multivariable Poisson regression analysis revealed that better preoperative lower extremity function (relative risk: 3.0; 95% confidence interval: 1.01-8.8) was significantly associated with postoperative improvement in the locomotive syndrome stage. This is the first study to longitudinally assess the locomotive syndrome stage in patients with DCM using GLFS-25. Our results indicated that patients with DCM experienced significant improvement in the locomotive syndrome stage following cervical spine surgery. Particularly, the preoperative lower extremity function was significant in postoperative improvement in the locomotive syndrome stage.

Does higher performance in a national licensing examination predict better quality of care? A longitudinal observational study of Ethiopian anesthetists.

Ethiopia made a national licensing examination (NLE) for associate clinician anesthetists a requirement for entry into the practice workforce. However, there is limited empirical evidence on whether the NLE scores of associate clinicians predict the quality of health care they provide in low-income countries. This study aimed to assess the association between anesthetists' NLE scores and three selected quality of patient care indicators. A multicenter longitudinal observational study was conducted between January 8 and February 7, 2023, to collect quality of care (QoC) data on surgical patients attended by anesthetists (n = 56) who had taken the Ethiopian anesthetist NLE since 2019. The three QoC indicators were standards for safe anesthesia practice, critical incidents, and patient satisfaction. The medical records of 991 patients were reviewed to determine the standards for safe anesthesia practice and critical incidents. A total of 400 patients responded to the patient satisfaction survey. Multivariable regressions were employed to determine whether the anesthetist NLE score predicted QoC indicators. The mean percentage of safe anesthesia practice standards met was 69.14%, and the mean satisfaction score was 85.22%. There were 1,120 critical incidents among 911 patients, with three out of five experiencing at least one. After controlling for patient, anesthetist, facility, and clinical care-related confounding variables, the NLE score predicted the occurrence of critical incidents. For every 1% point increase in the total NLE score, the odds of developing one or more critical incidents decreased by 18% (aOR = 0.82; 95% CI = 0.70 = 0.96; p = 0.016). No statistically significant associations existed between the other two QoC indicators and NLE scores. The NLE score had an inverse relationship with the occurrence of critical incidents, supporting the validity of the examination in assessing graduates' ability to provide safe and effective care. The lack of an association with the other two QoC indicators requires further investigation. Our findings may help improve education quality and the impact of NLEs in Ethiopia and beyond.

Structural and functional characterization of retinal impairment in T1DM patients without diabetic retinopathy: a 3-year longitudinal study.

To analyze the progression of structural and functional retinal impairment in type 1 diabetes mellitus (T1DM) patients with no clinical signs of diabetic retinopathy (DR) during a 3-year follow-up. This was an observational longitudinal study. Post-pediatric T1DM patients without clinical signs of DR, and sex- and age-matched healthy subjects were recruited at San Raffaele Hospital (Milan, Italy). Each patient underwent a comprehensive ophthalmological evaluation, including optical coherence tomography (OCT), OCT-angiography (OCT-A), retinal static and dynamic vessel analysis (DVA), and microperimetry. 21 eyes of 21 T1DM patients (10 females; 24 ± 2years old), and 21 age and sex-matched healthy subjects were enrolled. At baseline, T1DM eyes revealed a significantly decreased vessel length density using OCT-A (p < 0.001 and p = 0.046 in 3 × 3 and 6 × 6mm images) and a significantly increased vessel density index (p = 0.013 and p = 0.087 in 3 × 3 and 6 × 6mm images) of deep capillary plexus. DVA detected a significantly decreased vessel response to flicker light (p = 0.002). A significantly increased thickness of ganglion cellular layer 6-mm-diameter subfields in inferior and superior quadrants was found in diabetic patients (p < 0.001 in both subfields). At 3-years-follow-up no significant longitudinal changes were disclosed in all analyses. Concomitant subclinical microvascular and neurodegenerative damages could be early signs of DR onset that precede functional alterations and clinical signs of DR development. These alterations demonstrated a stable trend over time.

Characteristics of and changes in the cardiometabolic measures of Japanese workers grouped according to their vegetables and salt intake through workplace cafeteria meals.

This study aimed to objectively evaluate the diet consumed in a workplace cafeteria to group Japanese workers according to vegetables and salt intake and estimate the association of these groups with changes in cardiometabolic measurements. This longitudinal observational study estimated the food and nutrient intake of Japanese workers from data recorded in the cafeteria system of their workplace. The primary outcomes included cardiometabolic measures obtained via regular health check-ups conducted at the workplace. The participants were divided into four groups according to high or low vegetables and salt intake based on their respective medians and the association of each group with cardiometabolic measurement changes was estimated using robust regression with MM-estimation. A Japanese automobile manufacturing factory. The study included 1,140 men and women workers with available cafeteria and health check-up data. An inverse marginal association was observed between changes in triglyceride levels and high vegetables and low salt intake (β: -9.93, 95% confidence interval [CI]: -20.45, 0.59, p: 0.065) with reference to low vegetables and high salt intake. This association was stronger in participants who used the cafeteria more frequently (>71 days; β: -13.55, 95% CI: -25.51, -1.60, p: 0.027). The participants in the higher vegetables and lower salt intake group were more likely to exhibit decreased triglyceride levels. These findings encourage using workplace cafeteria meals to promote the health of workers.

#1722 Shared decision making and dialysis choice: an observational longitudinal cohort study

Abstract Background and Aims Shared decision-making is recommended for dialysis choice, whereby patients are supported in making decisions regarding dialysis modality together with healthcare professionals. The intervention ‘Shared decision making and dialysis choice’ has been a part of usual care at two hospitals in Denmark since 2018. The aim of this study was to describe the choice of dialysis modality and the outcomes for patients with kidney failure, who received a Shared decision-making intervention. Method An observational longitudinal cohort study was conducted. Data was collected retrospectively from 2018 to 2023 involving 484 patients with kidney failure from two Danish hospitals one regional hospital and one university hospital. Fisher's exact tests and Wilcoxon rank-sum tests were used to assess whether choice of dialysis modality differed significantly. Additionally, Aalen-Johansen estimation assessed time from the shared decision making intervention to treatment initiation, concordance between chosen and initiated treatment, and mortality before treatment initiation. Logistic regression and Cox proportional hazards evaluated the patient characteristics predicting these three outcomes. Results After the intervention, 68% chose home-based treatment, while 32% chose hospital-based treatment. With significant difference, more patients age ≤70 years, at university hospital and living with a partner chose home-based treatment. Half of the patients initiated treatment within 11 months, and predictors for initiating dialysis later than 11 months after the intervention were age ≥70 years (OR 2.52) and eGFR &amp;gt;15 ml/min/1.73 m² (2.80). 83% of the patients received the treatment chosen and predictors for concordance were center-based dialysis (HR 1.54), regional hospital (HR 1.52) and very mild to mild frailty (HR 1.55). Furthermore, 12% of the patients died before treatment initiation predicted by very mild (HR 3.67) to severe frailty (HR 6.42) and BMI &amp;lt;25 kg/m² (HR 2.84). Conclusion A high proportion of patient chose a home-based treatment after receiving the intervention ‘Shared decision making and dialysis choice’ and also initiated the dialysis choice chosen. Patients received the intervention timely and only few patients died before initiating dialysis. Our study has demonstrated that many factors influence patient choices and outcomes. Maybe routinely assessment of frailty and BMI prior to shared decision making intervention could improve the patient pathway.

#1944 How the patient characteristics and the prescription can be accounted for in patient-specific predictive HD models?

Abstract Background and Aims Compartmental models in HemoDialysis (HD) allow for understanding and predicting the patient-specific response to the treatment. These models, after training with consistent clinical data, can be adapted to each single patient through the estimation of a set of parameters. This work explores the relationship between the sets of estimated parameters and the anamneses of the enrolled patients, together with the settings of the HD sessions, and their time evolution. The finding of similar relationships will help properly set the models even avoiding the training phase. Method The data acquired during the INTERREG InterACTIVE-HD 2.0 observational longitudinal study, in partnership with 5 Italian and Switzerland hospitals (ASSTs Lariana, SetteLaghi, Valtellina e Alto Lario, Regional Hospital of Lugano, and Kantonsspital Graubünden of Chur Dialysis Units), were used (576 sessions). Clinical prescription, machine settings, and blood composition at the start, end, and every hour during the HDs were monitored over 7 months. The parametric multi-compartmental, multi-solute model optimized during the study was used. The patient-specific parameters are: Their default values (literature-based) are: Patient-specific parameters have been identified for each patient, by training the model with 3 session's data. Then the model can be used to predict the patient's response by knowing the clinical data at the beginning of the HD and setting the parameters equal to the mean of the 3 identified values. A correlation analysis between the patient-dependent parameters and the anamneses of the enrolled patients, together with the settings of the HD sessions, has been performed. The optimization orders have been also considered. Results k(K+), k(Urea), and k(Crea) are the first optimized and remain generally of the same magnitude. k(Na+), k(Cl-), k(HCO3-), k(Mg2+), and k(Glu), correlate with the UF rate, the therapy technique, or the concentrations in dialysate bags. They are later optimized and characterized by wider variability in values and optimization orders. k(Ca2+) remains at the default in 98% of the sessions, being optimized last. More convective therapies seem to induce patient-specific variations in active and passive cellular transport for specific solutes. η relevant correlations refer to the dialysate bag composition and the baseline conditions of the patients. They are in general late optimized, in HDF before than in SHD. η(Urea) and η(Crea) in 99% of the cases do not move from the default, suggesting a lower interaction of the non-ionic species with the filter membrane. They are optimized only in non-hypertensive insulin-dependent diabetic patients. No correlation between η and the filter material or the initial serum albumin was instead observed. ρ is related to the therapy; in HDF sessions it is over the range boundaries ([0,10]). For females undergoing SHD, it assumes the highest values (&amp;gt;9). ρ seems also to be affected by the use of beta-blockers (p &amp;lt; 0.01) and antihyperglycemic ((p &amp;lt; 0.01). Ca_buff coefficients for females (higher values) and males are statistically different. Diabetics using anti-hyperglycemia drugs are characterized by lower values. Conclusion Compartmental patient-specific models, if successfully trained become a useful support tool for therapy customization, mainly for ESRD patients with multiple comorbidities. The observed correlations represent the first step to causally relate the values of the modulating parameters with the patient characteristics implying the reduction or amplification of a specific response to the treatment. The next step will be an analysis of combined effects. The final goal is to be able to correctly set up the models even before the training phase is completed.

#2186 Lower psoas muscle volume is associated with CKD progression

Abstract Background and Aims Renal rehabilitation is important for keeping quality of life and kidney function of patients with CKD. Psoas muscle is representative of total body muscle and its cross-sectional area divided by squared height (PMI) is known to be associated with CKD prognosis. However, the selection of the slice of computer tomography (CT) used for calculation of PMI is arbitrary and may be a source of bias. Recently, AI technology using raw helical CT data has facilitated the measurement of total volume of the psoas major muscle (PMV), which is theoretically less biased by measurer. The aim of this study is to investigate the association between PMV and the progression of CKD. Method This is a pilot retrospective observational study using electrical health records (EHR) in Hyogo Prefectural Nishinomiya Hospital, Japan. We extracted patients with CKD who had taken abdominal CT in 2021 by nephrologists for evaluation of urological anatomy or clinical reasons. PMV was automatically extracted and measured by SYNAPSE VICENT (Fuji Film Medical), a commercially available software. Baseline laboratory data and patient characteristics were collected through EHR with a margin of 90 days from CT scan. The outcome of CKD progression was defined as a 40% decrease in eGFR from baseline. Survival analysis was performed by using the Cox proportional hazards model. Results We enrolled 145 consecutive CKD patients and excluded 37 whose observation period was less than 90 days. PMV was significantly greater in male than in female, positively associated with younger age and higher body mass index (BMI). PMV adjusted for age, sex, and BMI (adjPMV) decreased in a stepwise manner as baseline CKD stage advanced from G2 (N = 23) to G3b (N = 18) but was comparable in G4 (N = 37) and G5 (N = 6). The subjects were then divided into two groups (High-PMV and Low-PMV) according to whether their adjPMV were greater or less than the median value in each CKD stage. The High- and Low-PMV groups were comparable in age (71 ± 13 vs. 72 ± 13), female sex (42% vs. 45%), eGFR (41 ± 21 vs. 42 ± 22), urinary albumin-to-creatinine ratio (UACR), CRP, the prevalence of diabetes at baseline, respectively. PMI and PMV were significantly greater in High-PMV than in Low-PMV group (7.7 ± 1.8 vs. 5.8 ± 1.6 and 307 ± 110 vs. 205 ± 64, respectively). During the median follow up of 1.6 years, 40 events occurred. Hazards ratio for CKD progression was significantly lower in High-PMV group (0.48 [95% confidence interval: 0.25-0.95]) than Low-PMV group after adjusting for known risk factors (age, sex, eGFR, and UACR). Conclusion Preserved psoas muscle volume measured by a theoretically less biased method may be associated with better prognosis in CKD. A larger study in a different cohort, longitudinal observation, and interventional studies are warranted for future investigation.

Triglyceride-Glucose Index Associated with Future Renal Function Decline in the General Population.

The triglyceride-glucose index (TyG index), calculated as the logarithmic product of fasting triglyceride and glucose concentrations, is recognized as a simple marker of insulin resistance. However, the association between the TyG index and future decline of renal function remains unclear in the general population. To investigate whether the TyG index was associated with future decline of renal function in the general population who had not progressed to chronic kidney disease stage G2. Retrospective longitudinal observational cohort study. Individuals who received a population-based health checkup at JA Ehime Kouseiren Checkup Center from 2010 to 2019 (n = 134,007). Individuals without data of baseline fasting triglyceride or glucose levels, or baseline and follow-up data of estimated glomerular filtration rate (eGFR), or those with baseline eGFR < 60mL/min/1.73 m2 were excluded. Future renal function decline, defined as a ≥ 25% decrease in eGFR from baseline. Of 10,758 participants, 8,076 were classified into the low TyG index group (TyG index < 8.76, 1st to 3rd quartiles) and 2,682 into the high TyG index group (TyG index ≥ 8.76, 4th quartile). The mean follow-up period was 37.8 ± 23.6months. The incidence rates of renal function decline were 0.31 and 0.69 per 100 person-years in the low and high TyG index groups, respectively. In multivariate Cox proportional hazard models, high TyG index was significantly associated with future renal function decline (hazard ratio 2.25, 95% CI 1.40-3.60). This association was consistent across subgroups stratified by age, sex, body mass index, baseline eGFR, and diagnosed hypertension, diabetes, or dyslipidemia. In the general population, high TyG index was associated with future renal function decline. The TyG index may be useful in identifying individuals at high risk for future renal function decline in the setting of health checkups.

Association between heme oxygenase-1 and hyperlipidemia in pre-diabetic patients: a cross-sectional study

BackgroundAlthough the importance and benefit of heme oxygenase-1 (HO-1) in diabetes rodent models has been known, the contribution of HO-1 in the pre-diabetic patients with hyperlipidemia risk still remains unclear. This cross-sectional study aims to evaluate whether HO-1 is associated with hyperlipidemia in pre-diabetes.MethodsSerum level of HO-1 was detected using commercially available ELISA kit among 1,425 participants aged 49.3–63.9 with pre-diabetes in a multicenter Risk Evaluation of cAncers in Chinese diabeTic Individuals: A lONgitudinal (REACTION) prospective observational study. Levels of total cholesterol (TC) and triglyceride (TG) were measured and used to defined hyperlipidemia. The association between HO-1 and hyperlipidemia was explored in different subgroups.ResultThe level of HO-1 in pre-diabetic patients with hyperlipidemia (181.72 ± 309.57 pg/ml) was obviously lower than that in pre-diabetic patients without hyperlipidemia (322.95 ± 456.37 pg/ml). High level of HO-1 [(210.18,1,746.18) pg/ml] was negatively associated with hyperlipidemia (OR, 0.60; 95% CI, 0.37–0.97; p = 0.0367) after we adjusted potential confounding factors. In subgroup analysis, high level of HO-1 was negatively associated with hyperlipidemia in overweight pre-diabetic patients (OR, 0.50; 95% CI, 0.3–0.9; p = 0.034), especially in overweight women (OR, 0.42; 95% CI, 0.21–0.84; p = 0.014).ConclusionsIn conclusion, elevated HO-1 level was negatively associated with risk of hyperlipidemia in overweight pre-diabetic patients, especially in female ones. Our findings provide information on the exploratory study of the mechanism of HO-1 in hyperlipidemia, while also suggesting that its mechanism may be influenced by body weight and gender.

#1430 Acid excretion is disturbed in calcium oxalate and calcium phosphate stone formers in the Swiss kidney stone cohort

Abstract Background and Aims Kidney stone is a highly prevalent disease worldwide that causes high morbidity and may increase the risk for chronic kidney disease. Urine pH influences the crystallization of some types of kidney stones, such as calcium phosphate and uric acid. This study aimed to identify whether other acid-base parameters are associated with stone formation in the Swiss kidney stone cohort. Method Urinary, serum, clinical, and anthropomorphic baseline data were obtained from the Swiss Kidney Stone Cohort, a prospective, longitudinal, and multi-centric observational study. We included 200 non-stone formers (NSF, determined by CT scan), and 265 calcium oxalate (CaOx) and 113 calcium phosphate (CaP) stone formers with complete data for urine pH (collected under oil). Titratable acids were calculated based on urine phosphate and creatinine levels and urine bicarbonate based on urine pH. Net acid excretion (NAE) was calculated and NAE capacity (NAEC), the NAE for a given urine pH, which reveals the ability of kidneys to excrete acids, was calculated from the residuals of the relation between urine pH and NAE. Logistic regression analyses were used to estimate the potential contributions of various acid-base variables to the occurrence of CaOx or CaP kidney stones. Odds ratio (OR) are reported as “OR [95% confidence interval]” Results CaOx stone formers were slightly older than NSF individuals and CaP stone formers (NSF = 42.9 ± 13.6 y.o., CaOx = 47.3 ± 14.3 y.o., CaP = 43.3 ± 12.9 y.o.), slightly more overweight (NSF = 25.0 ± 4.15, CaOx = 27.1 ± 4.72, CaP = 25.9 ± 4.55), and had a higher prevalence of males (NSF = 56.0%, CaOx= 72.1%, CaP = 59.3%), but had similar baseline estimated glomerular filtration rate (NSF = 97.1 ± 16.5, CaOx = 96.3 ± 18.3, CaP = 99.5 ± 18.0 ml/min/1.73 m2). Hypertension, type 2 diabetes, pyelonephritis, and nephrocalcinosis were more prevalent among people with either type of kidney stones in comparison with NSFs, while inflammatory bowel disease was more common among CaOx stone formers in comparison with NSF individuals. CaOx and CaP stone formers showed disturbed capacity of excreting acids in relation to NSF (NAEC NSF = 1.81 ± 8.21 µmol/min; CaOx = −1.35 ± 8.45, P &amp;lt; .001; CaP = −0.89 ± 7.66, P = .016) and lower 24 h urine excretion of ammonium (NSF = 19.8 ± 8.70 µmol/min; CaOx = 17.4 ± 8.54, P = .012; CaP = 16.5 ± 8.23, P = .005), but also of citrate, oxalate, and potassium (Table 1). In addition, CaOx exhibited a lower urine volume. In contrast, both CaOx and CaP excreted more calcium (NSF = 3.12 ± 1.85 µmol/min; CaOx = 3.82 ± 1.91 p &amp;lt;0.001; CaP = 4.63 ± 2.27, p &amp;lt;0.001). Urine pH was more acidic in CaOx (p &amp;lt; 0.001) in comparison with NSFs and CaP (P = .004), NSF = 6.05 ± 0.51; CaOx = 5.86 ± 0.53; CaP = 6.16 ± 0.62. The correlations between urine pH and both urine calcium and ammonium were disturbed in CaOx stone formers and shifted in CaP stone formers (Fig. 1). Logistic models including urine ammonium, pH, citrate, phosphate, potassium, calcium, magnesium, oxalate, protein, and volume showed that ammonium is negatively associated with both CaOx and CaP stone formation (unadjusted model OR 0.41[0.26-0.57], p&amp;lt; 0.001 for CaOx and OR 0.42[0.26–0.67], P &amp;lt; .001 for CaP) and urine calcium is positively associated with kidney stones (OR 2.37 [1.72-3.43], P &amp;lt; .001 for CaOx and OR 5.82 [3.6–10.1], P &amp;lt; .001 for CaP). Similar results were obtained after adjustment for age, sex, and BMI. Removing urine ammonium, pH, and phosphate from our logistic model and adding NAEC rendered comparable goodness of fit and model complexity. Holding all other independent variables constant, the odds of CaOx associated with NAEC were 0.45 [0.33–0.61], P &amp;lt; .001 and with calcium of 2.6 [1.91–3.64], P &amp;lt; .001. For CaP, NAEC was still associated with it, but urine magnesium showed a lower odds ratio value (0.44 [0.27–0.72], P = .001 vs 0.54 [0.36–0.80], P = .003). Urine citrate was only associated with CaOx stones. Conclusion Baseline urine ammonium and net acid excretion capacity are strongly associated with the occurrence of CaOx and CaP kidney stones. Reduced NAEC indicates that poor control of ammonium excretion is a hallmark of both types of kidney stones, although more strongly apparent in CaOx.

#2134 Very low protein integrated diet (sVLPD), without keto analogues, in patients with advanced chronic renal failure: clinical and economic benefits

Abstract Background and Aims The integrated very low protein diet (sVLPD) has proven effective in slowing the progression of stage 5 chronic renal failure and in postponing the start of dialysis treatment (1)SVLPD with keto analogues is difficult to implement due to the high number of tablets to be taken (2), therefore, to increase compliance we decided to prescribe, in compliance with the guidelines of normal clinical practice, SVLPD (0.3 g/prot/day) integrated with only essential amino acid drugs without the use of keto analogues, in stage 5 patients and we have verified its effectiveness, safety and clinical and economic effects(3). Method 129 patients were started on dietary therapy (middle age 75.2 ± 13.7, 60.5%male, all with hypertension, 40.3% with diabetes and 24.8% with heart disease) who were tested at the beginning of the observation, every 3 months and for 24 months, characterizing blood chemistry tests and body composition (with impedance analysis). Results During the 24-month observation period 91 patients (70.5%) were compliant with dietary therapy. Chronic kidney disease progression is slowed with average eGFR 11.6 ± 3.3 (compliant) vs. 9.3 ± 2.7 (no compliant) mL/min/1.73 m2, p &amp;lt; 0.001) Urea (mg/dL) 116.1 ± 31.7 (compliant) 174.2 ± 42.2 (no compliant) p &amp;lt; 0.002; and initiation of dialysis treatment (adjusted HR = 0.361, CI 0.200–0.650, p = 0.001) was delayed without evidence of malnutrition, in compliant versus noncompliant patients. Metabolic acidosis was well compensated in both groups with an improving trend in bicarbonate levels in compliant patients. Hemoglobin, uricemia, serum albumin, glycemia (downward trend NS), potassium, sodium, chlorium, calcium, magnesium, pH, lipids remained within normal values. Better blood pressure control was observed in compliant patients compared to non-compliant patients (SBP (mmHg) 136.9 ± 11.8 vs 150.1 ± 7 &amp;lt;0.01), DBP (mmHg) 75 ± 3.1 vs 79.4 ± 1 &amp;lt;0.001) During the observation, there were 24 deaths (13 patients older than 85 years), 20 peritoneal dialysis hospitalizations, 36 hemodialysis hospitalizations, 4 preventive living transplants and 15 renal functional recoveries with eGFR consistently &amp;gt;15 mL/min/ 1.73 m2. The months of dialysis avoided generated gross savings in terms of healthcare expenditure equal to EUR 3,076,470; the expenditure sustained by the Marche region for protein-free products (EUR 90 per patient per month) was EUR 158,358. As a result, the total net savings were EUR 2,918,112. Conclusion This non-interventional longitudinal observational study is part of standard clinical practice and suggests that VLPD supplemented with only essential amino acids is safe and effective and could be widely used to reduce the incidence of dialysis treatments, with a favorable economic impact on the National Health Service.