End-Stage Kidney Disease in the Elderly: Approach to Dialysis Initiation, Choosing Modality, and Predicting Outcomes

Effects of low-flux and high-flux hemodialysis on the survival of elderly maintenance hemodialysis patients

BACKGROUND

Elderly hemodialysis (HD) patients have a high risk of death. The effect of different types of HD membranes on survival is still controversial. The purpose of this study was to determine the relationship between the use of low-flux or high-flux membranes and all-cause and cardiovascular mortality in elderly hemodialysis patients.

METHODS

This was a retrospective clinical study involving maintenance hemodialysis patients which were categorized into low-flux and high-flux groups according to the dialyzer they were using. Propensity score matching was used to balance the baseline data of the two groups. Survival rates were compared between the two groups, and the risk factors for death were analyzed by multivariate Cox regression.

RESULTS

Kaplan-Meier survival analysis revealed no significant difference in all-cause mortality between the low-flux group and the high-flux group (log-rank test, p = 0.559). Cardiovascular mortality was significantly greater in the low-flux group than in the high-flux group (log-rank test, p = 0.049). After adjustment through three different multivariate models, we detected no significant difference in all-cause mortality. Patients in the high-flux group had a lower risk of cardiovascular death than did those in the low-flux group (HR = 0.79, 95% CI, 0.54-1.16, p = 0.222; HR = 0.58, 95% CI, 0.37-0.91, p = 0.019).

CONCLUSIONS

High-flux hemodialysis was associated with a lower relative risk of cardiovascular mortality in elderly MHD patients. High-flux hemodialysis did not improve all-cause mortality rate. Differences in urea distribution volume, blood flow, and systemic differences in solute clearance by dialyzers were not further analyzed, which are the limitations of this study.

Early Serum Biomarkers of Cardiovascular Disease in Elderly Patients with Chronic Kidney Disease

BACKGROUND

The global population is aging. It is estimated that by 2050, the proportion of the elderly population will reach 16%. Various studies have suggested that elderly people have a greater incidence of CKD. These elderly patients are also susceptible to cardiovascular disease (CVD), which is the leading cause of death, resulting in poor prognosis in this population. However, CVD in such patients is often insidious and lacks early markers for effective evaluation. Fortunately, several studies have recently proposed biomarkers associated with this process.

SUMMARY

This study aimed to summarize the early biomarkers of CVD in elderly patients with CKD to provide a basis for its prevention and treatment.

KEY MESSAGES

This review outlines four categories of potential early biomarkers. All of them have been shown to have some clinical value for these patients, but more research is still needed.

Acute Kidney Injury and Subsequent Kidney Failure With Replacement Therapy Incidence in Older Adults With Advanced CKD: A Cohort Study of US Veterans

Rationale & Objective

Advanced age is a major risk factor for chronic kidney disease (CKD) development, which has high heterogeneity in disease progression. Acute kidney injury (AKI) hospitalization rates are increasing, especially among older adults. Previous AKI epidemiologic analyses have focused on hospitalized populations, which may bias results toward sicker populations. This study examined the association between AKI and incident kidney failure with replacement therapy (KFRT) while evaluating age as an effect modifier of this relationship.

Study Design

Retrospective cohort study.

Setting & Participants

24,133 Veterans at least 65 years old with incident CKD stage 4 from 2011 to 2013.

Exposures

AKI, AKI severity, and age.

Outcomes

KFRT and death.

Analytical Approach

The Fine-Gray competing risk regression was used to model AKI and incident KFRT with death as a competing risk. A Cox regression was used to model AKI severity and death.

Results

Despite a nonsignificant age interaction between AKI and KFRT, a clinically relevant combined effect of AKI and age on incident KFRT was observed. Compared with our oldest age group without AKI, those aged 65-74 years with AKI had the highest risk of KFRT (subdistribution HR [sHR], 14.9; 95% CI, 12.7-17.4), whereas those at least 85 years old with AKI had the lowest (sHR, 1.71; 95% CI, 1.22-2.39). Once Veterans underwent KFRT, their risk of death increased by 44%. A 2-fold increased risk of KFRT was observed across all AKI severity stages. However, the risk of death increased with worsening AKI severity.

Limitations

Our study lacked generalizability, was restricted to ever use of medications, and used inpatient serum creatinine laboratory results to define AKI and AKI severity.

Conclusions

In this national cohort, advanced age was protective against incident KFRT but not death. This is likely explained by the high frequency of deaths observed in this population (51.1%). Nonetheless, AKI and younger age are substantial risk factors for incident KFRT.

Trends in clinical outcomes of older hemodialysis patients: data from the 2023 Korean Renal Data System (KORDS)

With an increasing aging population, the mean age of patients with end-stage kidney disease (ESKD) is globally increasing. However, the current clinical status of elderly patients undergoing hemodialysis (HD) is rarely reported in Korea. The current study analyzed the clinical features and trends of older patients undergoing HD from the Korean Renal Data System (KORDS) database. The patients were divided into three groups according to age: <65 years (the young group), n = 50,591 (35.9%); 65-74 years (the younger-old group), n = 37,525 (26.6%); and ≥75 years (the older-old group), n = 52,856 (37.5%). The proportion of older-old group undergoing HD significantly increased in incidence and decreased in prevalence from 2013 to 2022. The median levels of hemoglobin, serum creatinine, albumin, calcium, phosphorus, and intact parathyroid hormone significantly decreased in the older-old group. The proportions of arteriovenous fistula creation and left forearm placement showed decreased trends with age. Although the utilization of low surface area dialyzers increased with age, the dialysis adequacy, including urea reduction ratio and Kt/V was within acceptable range in the older-old group on HD. Over the past 20 years, the mortality rate in the older-old group has increased, with cardiovascular diseases decreasing and infectious diseases increasing. The incidence of elderly patients undergoing HD has increased over time, but the high mortality of the older-old group needs to be solved. Therefore, it is imperative to develop holistic strategies based on age and individual needs for patients with ESKD.

Development of a prognostic risk score to predict early mortality in incident elderly Japanese hemodialysis patients

BACKGROUND

Information of short-term prognosis after hemodialysis (HD) introduction is important for elderly patients with chronic kidney disease (CKD) and their families choosing a modality of renal replacement therapy. Therefore, we developed a risk score to predict early mortality in incident elderly Japanese hemodialysis patients.

MATERIALS AND METHODS

We analyzed data of incident elderly HD patients from a nationwide cohort study of the Japanese Society for Dialysis Therapy Renal Data Registry (JRDR) to develop a prognostic risk score. Candidate risk factors for early death within 1 year was evaluated using multivariate logistic regression analysis. The risk score was developed by summing up points derived from parameter estimate values of independent risk factors. The association between risk score and early death was tested using Cox proportional hazards models. This risk score was validated twice by using an internal validation cohort derived from the JRDR and an external validation cohort collected for this study.

RESULTS

Using the development cohort (n = 2,000), nine risk factors were retained in the risk score: older age (>85), yes = 2, no = 0; sex, male = 2, female = 0; lower body mass index (<20), yes = 2, no = 0; cancer, yes = 1, no = 0; dementia, yes = 3, no = 0; lower creatinine (<6.5 mg/dL), yes = 1, no = 0; lower albumin (<3.0 g/dL), yes = 3, no = 0; normal or high calcium (≥8.5 mg/dL), yes = 1, no = 0; and higher C reactive protein (>2.0 mg/dL), yes = 2, no = 0. In the internal and external validation cohorts (n = 739, 140, respectively), the medium- and high-risk groups (total score, 6 to 10 and 11 or more, respectively) showed significantly higher risk of early death than the low-risk group (total score, 0 to 5) (p<0.001).

CONCLUSION

We developed a prognostic risk score predicting early death within 1 year in incident elderly Japanese HD patients, which may help detect elderly patients with a high-risk of early death after HD introduction.

Comparison of young and old patients on peritoneal dialysis: A retrospective observational study

BACKGROUND

With a global increase in life expectancy around the world, the burden of chronic kidney disease in the elderly is increasing. The number of elderly patients undergoing peritoneal dialysis (PD) is also increasing. There is still a perception that PD may be associated with an increased risk of complications in these elderly patients.

METHODS

A total of 311 patients, of which 103 PD patients aged 65 and over and 208 PD patients under 65 years of age, were followed in a single center and evaluated, retrospectively. Demographic data of these patients, albumin values at first PD and during PD time, residual urine amount, number of peritonitis, time to the first peritonitis attack, PD endpoints, and mortality were compared.

RESULTS

Peritonitis and technique failure rates were lower in patients aged 65 and over who applied PD (0.61-0.75, 6.8%-23.1%, respectively). There was no difference in peritonitis-free survival (p = 0.931). Need for help HR 2.569 [95%CI 1.564-4.219] (p < 0.05), time to first peritonitis attack HR 0.983 [95%CI 0.974-0.992] (p < 0.05), mean albumin value HR 0.191 [95%CI 0.088-0.413] (p < 0.05), urine output level HR 1.154 [95%CI 1.010-1.318] (p < 0.05) were factors affecting mortality.

CONCLUSION

Peritonitis and technical survival evaluations of elderly PD patients, other than mortality, were lower than younger PD patients. However, the need for help is one of the biggest obstacles to this method for the elderly. We believe that incentives in this regard will increase the number of elderly PD patients.

Importance of dialysis specialists in early mortality in elderly hemodialysis patients: a multicenter retrospective cohort study

The early mortality rate in elderly patients undergoing hemodialysis is more than twice that in young patients, requiring more specialized healthcare. We investigated whether the number of professional dialysis specialists affected early mortality in elderly patients undergoing hemodialysis. This multicenter retrospective cohort study analyzed data from 1860 patients aged ≥ 70 years who started hemodialysis between January 2010 and December 2017. Study regions included Seoul, Gyeonggi-do, Gangwon-do, Daejeon/Chungcheong-do, Daegu/Gyeongsangbuk-do, and Busan/Ulsan/Gyeongsangnam-do. The number of patients undergoing hemodialysis per dialysis specialist was calculated using registered data from each hemodialysis center. Early mortality was defined as death within 6 months of hemodialysis initiation. Gangwon-do (28.3%) and Seoul (14.5%) showed the highest and lowest early mortality rate, respectively. Similarly, Gangwon-do (64.6) and Seoul (43.9) had the highest and lowest number of patients per dialysis specialist, respectively. Relatively consistent results were observed for the regional rankings of early mortality rate and number of patients per dialysis specialist. Multivariate Cox regression analysis-adjusted for previously known significant risk factors-revealed that the number of patients per dialysis specialist was an independent risk factor for early mortality (hazard ratio: 1.031, p < 0.001). This study underscores the growing need for dialysis specialists for elderly hemodialysis patients in Korea.

Patient engagement during the transition from nondialysis-dependent chronic kidney disease to dialysis: A meta-ethnography

INTRODUCTION

Patient engagement, encompassing both patient experience and opportunities for involvement in care, has been associated with increased patient satisfaction and the overall quality of care. Despite its importance, there is limited knowledge regarding patient engagement in the transition from nondialysis-dependent chronic kidney disease (CKD) to dialysis-dependent treatment. This systematic review employs meta-ethnography to synthesize findings from qualitative studies examining patients' experiences of engagement during this transition, with the aim of developing a comprehensive theoretical understanding of patient engagement in the transition from nondialysis-dependent CKD to dialysis.

METHODS

A systematic search of six databases, namely the Cochrane Library, PsycINFO, Scopus, Embase, PubMed and Web of Science was conducted to identify eligible articles published between 1990 and 2022. Meta-ethnography was utilized to translate and synthesize the findings and develop a novel theoretical interpretation of 'patient engagement' during the transition to dialysis.

RESULTS

A total of 24 articles were deemed eligible for review, representing 21 studies. Patient engagement during a transition to dialysis was found to encompass three major domains: psychosocial adjustment, decision-making and engagement in self-care. These three domains could be experienced as an iterative and mutually reinforcing process, guiding patients toward achieving control and proficiency in their lives as they adapt to dialysis. Additionally, patient engagement could be facilitated by factors including patients' basic capability to engage, the provision of appropriate education, the establishment of supportive relationships and the alignment with values and resources.

CONCLUSIONS

The findings of this review underscore the necessity of involving patients in transitional dialysis care, emphasizing the need to foster their engagement across multiple domains. Recommendations for future interventions include the provision of comprehensive support to enhance patient engagement during this critical transition phase. Additional research is warranted to explore the effects of various facilitators at different levels.

PATIENT OR PUBLIC CONTRIBUTION

The studies included in our review involved 633 participants (547 patients, 14 family members, 63 healthcare providers and 9 managers). Based on their experiences, views and beliefs, we developed a deeper understanding of patient engagement and how to foster it in the future.

Frailty predicts increased risk of reintervention in the 2 years after arteriovenous fistula creation

INTRODUCTION

Frailty is associated with adverse survival and increased hospital use in patients with end-stage kidney disease (ESKD). Dialysis access failure is an important source of morbidity and mortality for these patients. There is limited evidence about the interactions between frailty and haemodialysis access failure. This population-based cohort study aimed to determine if haemodialysis access reintervention was predicted by frailty.

METHODS

Routinely-collected hospital data linked with death records were analyzed for all patients with ESKD who had a new arteriovenous fistula or graft (AVF) created between 2010 and 2012 in New South Wales, Australia. Frailty risk was assigned by the Hospital Frailty Risk Score. Multivariate Cox-proportional hazard ratios (HR), adjusted for patient and procedural variables, quantified if frailty was prognostic for adverse haemodialysis access outcomes in the 2 years after AVF creation.

RESULTS

Almost one quarter of the 2302 patients who had a new AVF created during the study period were classified as high frailty risk (554, 24.1%). Compared to low frailty risk patients, patients with high frailty had a significantly greater risk of reintervention for AVF failure in the 2 years after creation (HR 1.68; 95% CI 1.45-1.96), adjusted for age, sex and prior AVFs. Frailer patients were also more likely to have perioperative complications, longer hospital length of stay and readmission to hospital. Frailty was associated with a higher risk of mortality at 2 years after AVF creation (adjusted HR 2.65; 95% CI 1.72-4.10).

CONCLUSION

Frailty predicted adverse haemodialysis access outcomes, with frailer patients having higher rates of AVF reinterventions. These results can assist clinicians engaging in shared decision-making discussions about dialysis access risks and help personalize dialysis access decisions.

Prevalence of physical frailty and impact on survival in patients with chronic kidney disease: a systematic review and meta-analysis

BACKGROUND

Frailty is common in chronic kidney disease (CKD) patients and becomes more prevalent as kidney disease progresses. This study aimed to investigate the prevalence of physical frailty and quantify the relationship between frailty and mortality risk in patients with CKD.

METHODS

PubMed, Web of Science, Embase, Cochrane Central Register of Controlled Trials, Clinicaltrial.gov, and major renal academic conferences were systematically searched, and additional references to relevant articles were manually searched. The prevalence of physical frailty and the risk of mortality based on random-effects models were assessed using percentages and hazard ratio (HR) with a 95% confidence interval (CI).

RESULTS

A total of 139 articles, including 1,675,482 participants, met the eligibility criteria for the meta-analysis. The results showed that 34.5% (95% CI 31.0 to 38.1%) of CKD patients showed signs of frailty, and 39.4% (95% CI 35.4 to 43.5%) had prefrail symptoms. Compared to non-frail patients, the risk of mortality was increased by 94.1% (95% CI 1.586 to 2.375) in frail patients and 34.5% (95% CI 1.231 to 1.469) in prefrail patients.

CONCLUSION

The high prevalence of frailty and prefrail in adults with CKD and resulting in premature death emphasize the importance of measuring frailty, which provides important prognostic information and may provide opportunities for interventions to improve the prognosis of patients with CKD.

Mortality and associated risk factors between young and elderly maintenance haemodialysis patients: a multicentre retrospective cohort study in China

OBJECTIVES

Mortality and associated risk factors in young and elderly haemodialysis patients with end-stage kidney disease (ESKD) have not been well examined in China. Therefore, we aimed to assess the all-cause mortality and risk factors associated with all-cause mortality between young and elderly haemodialysis patients in China.

DESIGN

A population-based multicentre retrospective cohort study.

SETTING

Using the Dialysis Initiation based on Fuzzy mathematics Equation study data, patients with ESKD undergoing maintenance haemodialysis from 24 centres in China from 1 January 2008 to 30 September 2015.

PARTICIPANTS

1601 enrolled patients with ESKD were categorised into young group (18-44 years old) and elderly (≥60 years old) group.

OUTCOME MEASURES

The primary outcome was all-cause mortality. We estimated overall survival using a log-rank test. Cox proportional hazard regression analysis was implemented to identify risk factors and HR associated all-cause mortality.

RESULTS

During a mean follow-up of 48.17±25.59 months, of the 1601 subjects, 319 (19.92%) patients death, including 64 (9.97%) in young group and 255 (26.59%) in elderly group, respectively. The cumulative survival in elderly group was lower than young group (Log Rank tests=63.31, p<0.001). Multivariate Cox proportional hazards analysis showed the cardiovascular disease (HR, 2.393; 95% CI 1.532 to 3.735; p<0.001), cerebrovascular disease (HR, 2.542; 95% CI 1.364 to 4.739; p=0.003) and serum albumin<3.5 g/dL (HR, 1.725; 95% CI 1.091 to 2.726; p=0.020) at the haemodialysis initiation were associated with increased risk of all-cause mortality in elderly groups; however, the cardiovascular disease only was associated with increased risk of all-cause mortality in young groups.

CONCLUSIONS

The all-cause mortality of elderly haemodialysis patients were higher than young haemodialysis patients in China. Identified risk factors associated all-cause mortality may inform development of age-appropriate treatment, intervention strategies and improve survival prognosis of this unique population.

Dialysis modality utilization patterns and mortality in older persons initiating dialysis in Australia and New Zealand

AIM

The benefits of dialysis in the older population remain highly debated, particularly for certain dialysis modalities. This study aimed to explore the dialysis modality utilization patterns between in-centre haemodialysis (ICHD), peritoneal dialysis (PD) and home haemodialysis (HHD) and their association with outcomes in older persons.

METHODS

Older persons (≥75 years) initiating dialysis in Australia and New Zealand from 1999 to 2018 reported to the Australia and New Zealand Dialysis and Transplant (ANZDATA) registry were included. The main aim of the study was to characterize dialysis modality utilization patterns and describe individual characteristics of each pattern. Relationships between identified patterns and survival, causes of death and withdrawal were examined as secondary analyses, where the pattern was considered as the exposure.

RESULTS

A total of 10 306 older persons initiated dialysis over the study period. Of these, 6776 (66%) and 1535 (15%) were exclusively treated by ICHD and PD, respectively, while 136 (1%) ever received HHD during their dialysis treatment course. The remainder received both ICHD and PD: 906 (9%) started dialysis on ICHD and 953 (9%) on PD. Different individual characteristics were seen across dialysis modality utilization patterns. Median survival time was 3.0 (95%CI 2.9-3.1) years. Differences in survival were seen across groups and varied depending on the time period following dialysis initiation. Dialysis withdrawal was an important cause of death and varied according to individual characteristics and utilization patterns.

CONCLUSION

This study showed that dialysis modality utilization patterns in older persons are associated with mortality, independent of individual characteristics.

Outcomes of peritoneal dialysis in elderly vs non-elderly patients: A systemic review and meta-analysis

OBJECTIVES

Several studies have compared outcomes of peritoneal dialysis (PD) between elderly and non-elderly patients but with variable results. We hereby designed this review to compare mortality, peritonitis, and technique survival between elderly and non-elderly patients on PD.

METHODS

PubMed, Embase, and Google Scholar were searched for studies comparing outcomes of PD between elderly and non-elderly patients. The last search date was 14th July 2021.

RESULTS

Fourteen studies were included. 12 studies defined the elderly as ≥65 years of age and these were included in the meta-analysis. Pooled analysis of crude (RR: 2.45 95% CI: 1.36, 4.40 I2 = 97% p = 0.003) and adjusted data (HR: 2.80 95% CI: 2.45, 3.09 I2 = 0% p<0.00001) indicated a statistically significant increased risk of mortality amongst elderly patients as compared to non-elderly patients. Meta-analysis of four studies demonstrated a statistically significant increased risk of peritonitis in the elderly (RR: 1.56 95% CI: 1.18, 2.07 I2 = 76% p = 0.002). Pooled analysis demonstrated no statistically significant difference in technique survival between the two groups (RR: 0.95 95% CI: 0.86, 1.05 I2 = 86% p = 0.32).

CONCLUSION

Elderly patients on PD have a significantly increased risk of mortality as compared to non-elderly patients. The risk of peritonitis is also significantly increased in older adults but the increased age has no impact on technique survival. Further studies are needed to strengthen our conclusions.

Influences of the priming procedure and saline circulation conditions on polyvinylpyrrolidone in vitro elution from polysulfone membrane dialyzers

In hemodialysis (HD), the patient's blood is purified via circulation in an extracorporeal circuit containing a dialyzer. In the manufacturing process of polysulfone (PSu) membrane dialyzers, the membranes are hydrophilized via the addition of the hydrophilic agent polyvinylpyrrolidone (PVP) to increase their hydraulic permeability. The elution of PVP from the membrane reduces the membrane's hydraulic permeability, and the eluted PVP could cause adverse effects in the human body. Therefore, it is important to identify the factors that induce PVP elution from PSu dialyzer membranes to improve the efficiency and safety of HD. In the present study, experimental circuits connecting each of the three types of PSu membrane dialyzers that had been sterilized, using gamma irradiation, autoclaving, or in-line steam methods, were prepared. After the dialyzers were primed, saline was circulated in the circuits at a flow rate of 100 mL/min or 200 mL/min. At 0, 2, 4, 6, and 8 h after circulation was initiated, the amount of PVP eluted from the PSu membranes in vitro was determined. In this experimental setting, longer the circulation duration, greater the amount of PVP eluted from the PSu membranes of the tested dialyzers; however, the flow rate did not influence the in vitro elution of PVP. Furthermore, the immersion of the dialyzer membranes in saline for 24 h strongly facilitated the in vitro elution of PVP. In sum, these results suggest that the duration of PSu membrane incubation in saline is a determinant of the level of PVP elution from the PSu membrane dialyzers.

•

The flow rate did not influence the in vitro PVP elution from PSu membrane dialyzers.

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The time of PSu membrane incubation in saline is a determinant of PVP elution level.

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Substances other than PVP are eluted from PSu membrane dialyzers.

Leveraging digital transformation to empower clinical governance: enhancement in intermediate clinical endpoints and patients' survival after implementation of a continuous quality improvement program in a large dialysis network

BACKGROUND

Treatment of end-stage kidney disease patients is extremely challenging given the inter-connected functional derangements and comorbidities characterizing the disease. Continuous Quality Improvement (CQI) in healthcare is a structured clinical governance process helping physicians adhere to best clinical practices. The digitization of patient medical records and data warehousing technologies has standardized and enhanced the efficiency of the CQ&Iacute;s evidence generation process. There is limited evidence that ameliorating intermediate outcomes would translate into better patient-centered outcomes. We sought to evaluate the relationship between Fresenius Medical Care (FME) medical patient review CQI (MPR-CQI) implementation and patients' survival in a large historical cohort study.

METHODS

We included all incident adult patients with 6 months survival on chronic dialysis registered in the EMEA region between 2011-2018. We compared medical Key Performance Indicator (KPI) target achievements and 2-year mortality for patients enrolled prior and after to MPR-CQI policy onset (Cohort A and Cohort B). We adopted a structural equation model where MPR-CQI policy was the exogenous explanatory variable, KPI target achievements the mediator variable, and survival was the outcome of interest.

RESULTS

4.270 patients (Cohort A: 2.397; Cohort B: 1.873) met the inclusion criteria. We observed an increase in KPI target achievements after MPR-CQI policy implementation. Mediation analysis demonstrated a significant reduction in mortality due to indirect effect of MPR-CQI implementation through improvement in KPI target achievement occurring in the post-implementation era (OR: 0.70; 95%CI: 0.65-0.76; p < 0.0001).

CONCLUSIONS

Our study suggests that MPR-CQI achieved by standardized clinical practice and periodical, structured, medical patient review may improve patients' survival through improvement in medical KPIs.

Elderly Patients in a Large Nephrology Unit: Who Are Our Old, Old-Old and Oldest-Old Patients?

The world population is aging, and the prevalence of chronic kidney disease (CKD) is increasing. Whether this increase is also due to the methods currently being used to assess kidney function in the elderly is still a matter of discussion. We aimed to describe the actual referral pattern of CKD patients in a large nephrology unit and test whether the use of different formulae to estimate kidney function could affect the staging and the need for specialist care in the older subset of our population. In 2019, 1992 patients were referred to our center. Almost 28% of the patients were aged ≥80 and about 6% were ≥90 years old. Among the causes of kidney disease, glomerulonephritis displayed a higher prevalence in younger patients whereas hypertensive or diabetic kidney disease were more prevalent in older patients. The prevalence of referred patients in advanced CKD stages increased with age; estimated glomerular filtration rate (eGFR) decreased with age regardless of which equation was used (chronic kidney disease epidemiology collaboration (CKD-EPI), Lund–Malmö Revised (LMR), modification of diet in renal disease (MDRD), Full Age Spectrum (FAS), or Berlin Initiative Study 1 (BIS)). With CKD-EPI as a reference, MDRD and FAS underestimated the CKD stage while LMR overestimated it. The BIS showed the highest heterogeneity. Considering an eGFR threshold limit of 45 mL/min for defining “significant” CKD in patients over 65 years of age, the variability in CKD staging was 10% no matter which equation was used. Our study quantified the weight of “old” and “old-old” patients on follow-up in a large nephrology outpatient unit and suggested that with the current referral pattern, the type of formula used does not affect the need for CKD care within the context of a relatively late referral, particularly in elderly patients.

Serum level of high mobility group box protein-1 and prognosis of patients with end-stage renal disease on hemodialysis and peritoneal dialysis

To investigate serum level of high mobility group box protein-1 (HMGB1) and prognosis of patients with end-stage renal disease (ESRD) on hemodialysis (HD) and peritoneal dialysis (PD).This prospective cohort observational study included a total of 253 ESRD patients who came to our hospital for HD or PD from February 2013 to February 2015. Enzyme linked immunosorbent assay (ELISA) method was used to detect the serum level of HMGB1, interleukin (IL-6), IL-8, and tumor necrosis factor-alpha (TNF-α). The kidney disease quality of life short form (KDQOL-SF) and kidney disease targeted area (KDTA) was applied for evaluating the quality of life. Kaplan-Meier (K-M) curve was performed for survival time.Serum level of HMGB1 in patients on HD was higher than PD. HMGB1 levels were gradually decreased with the treatment of HD or PD. Furthermore, HMGB1 was positively correlated with IL-6 and TNF-α. Moreover, patients with higher HMGB1 had more complications than patients with lower HMGB1, but there was no difference for the survival rate. In addition, the quality of life was associated with different dialysis methods.The serum level of HMGB1 and prognosis of ESRD patients was associated with different dialysis methods.

Shared decision-making in advanced kidney disease: a scoping review protocol

INTRODUCTION

Patients with advanced kidney disease (AKD) have to make difficult treatment modality decisions as their disease progresses towards end-stage kidney disease. International guidelines in nephrology suggest shared decision-making (SDM) to help patients make timely treatment modality decisions that align with their values and preferences. However, systematic reviews or scoping reviews on these SDM interventions and on their reported use or outcomes are lacking. This limits the adoption of SDM in clinical practice and hampers further research and development on the subject. Our aim is to provide a comprehensive and up-to-date overview of these SDM interventions by means of a scoping review of the literature. Scoping reviews can provide a broad overview of a topic, identify gaps in the research knowledge base and report on the types of evidence that address and inform practices. This paper presents our study protocol.

METHODS AND ANALYSIS

The proposed scoping review will be performed in accordance with the Joanna Briggs Institute's (JBI) methodology for scoping reviews. It will cover both qualitative and quantitative scientific literature, as well as the grey literature on SDM interventions for treatment modality decisions in AKD. Only literature written in English will be considered for inclusion. Two independent reviewers will participate in an iterative process of screening the literature, paper selection and data extraction. Disagreements between the reviewers will be resolved by discussion until consensus is reached or after consultation with the research team when needed. Results will be reported with descriptive statistics and diagrammatic or tabular displayed information, accompanied by narrative summaries as explained in the JBI guidelines.

ETHICS AND DISSEMINATION

Ethical approval for the conduct of this study is not required. We will analyse previously collected data for the proposed scoping review. Our results will be published in a peer-reviewed journal and disseminated through conferences and/or seminars.

Prevalence and outcomes of fragility: a frailty-inflammation phenotype in children with chronic kidney disease

BACKGROUND

Frailty is a condition of decreased physiologic reserve and increased vulnerability to stressors. Frailty in combination with inflammation has been associated with increased mortality risk in adults with advanced chronic kidney disease (CKD). This study aimed to investigate prevalence and outcomes associated with a frailty-inflammation phenotype, or "fragility," in children with CKD.

METHODS

We analyzed 557 children (age 6-19 years, eGFR 30-90 ml/min/1.73 m²) from the Chronic Kidney Disease in Children (CKiD) study. Based on adult models, the CKiD fragility model included four indicators: (1) suboptimal growth/weight gain (BMI < 5th percentile-for-height-age, deceleration ≥ 10 BMI-for-height-age percentiles/1 year, height-for-age percentile < 3rd or deceleration ≥ 10 height percentiles/1 year); (2) low muscle mass (mid-upper-arm circumference < 5th percentile or deceleration ≥ 10 percentiles/1 year); (3) fatigue (parent/child report); (4) inflammation (CRP > 3 mg/l). Logistic regression was used to evaluate association of fragility indicators with three adverse outcomes: frequent infection (> 1 per year/3 years), hospitalization (any), and rapid CKD progression (decline in eGFR > 30% or initiation of renal replacement therapy within 3 years).

RESULTS

Prevalence of fragility indicators 1 year after study entry were 39% (suboptimal growth/weight gain), 62% (low muscle mass), 29% (fatigue), and 18% (inflammation). Prevalence of adverse outcomes during the subsequent 3 years were 13% (frequent infection), 22% (hospitalization), and 17% (rapid CKD progression). Children with ≥ 3 fragility indicators had 3.16-fold odds of frequent infection and 2.81-fold odds of hospitalization, but did not have rapid CKD progression.

CONCLUSIONS

A fragility phenotype, characterized by the presence of ≥ 3 indicators, is associated with adverse outcomes, including infection and hospitalization in children with CKD.

Discussions during shared decision-making in older adults with advanced renal disease: a scoping review

OBJECTIVES

This review summarises the information available for clinicians counselling older patients with kidney failure about treatment options, focusing on prognosis, quality of life, the lived experiences of treatment and the information needs of older adults.

DESIGN

We followed the Joanna Briggs Institute Methodology for Scoping Reviews. The final report conforms to the PRISMA-ScR guidelines.

DATA SOURCES

PubMed, PsycINFO, CINAHL, Embase, Scopus, Web of Science, TRIP and online repositories (for dissertations, guidelines and recommendations from national renal associations).

ELIGIBILITY CRITERIA FOR INCLUSION

Articles in English studying older adults with advanced kidney disease (estimated glomerular filtration rate <30 mL/min/1.73 m2); published between January 2000 and August 2018. Articles not addressing older patients separately or those comparing between dialysis modalities were excluded.

DATA EXTRACTION AND SYNTHESIS

Two independent reviewers screened articles for inclusion and grouped them by topic as per the objectives above. Quantitative data were presented as tables and charts; qualitative themes were identified and described.

RESULTS

248 articles were included after screening 15 445 initial results. We summarised prognostic scores and compared dialysis and non-dialytic care. We highlighted potentially modifiable factors affecting quality of life. From reports of the lived experiences, we documented the effects of symptoms, of ageing, the feelings of disempowerment and the need for adaptation. Exploration of information needs suggested that patients want to participate in decision-making and need information, in simple terms, about survival and non-survival outcomes.

CONCLUSION

When discussing treatment options, validated prognostic scores are useful. Older patients with multiple comorbidities do not do well with dialysis. The modifiable factors contributing to the low quality of life in this cohort deserve attention. Older patients suffer a high symptom burden and functional deterioration; they have to cope with significant life changes and feelings of disempowerment. They desire greater involvement and more information about illness, symptoms and what to expect with treatment.

Validation of risk prediction tools in elderly patients who initiate dialysis

PURPOSE

The number of elderly patients with end-stage renal disease on maintenance dialysis therapy is gradually increasing. The elderly population has difficulties in making decisions regarding initiation of dialysis treatment because of their high morbidity and frailty. The purpose of this study was to determine the best prognostic tool in predicting short-term mortality in elderly patients undergoing dialysis.

METHODS

This study is a multicenter retrospective study. We enrolled patients, aged ≥ 75 years, who began hemodialysis at three university hospitals in Korea from January 2010 to December 2016. We applied two comorbidity-based score tools (Thamer and Wick, each consisting of seven variables) and the Clinical Frailty Scale (CFS, seven scales), which were validated for mortality prediction in elderly incident patients. Patient's information was obtained from electronic medical records in the participating center, and mortality data (up to December 2016) were obtained from the Korean National Statistical Office. Models were compared using the area under the receiver operating characteristic curve.

RESULTS

Among the 219 patients enrolled in this study, the 3- and 6-month mortality rates were 31 (14.4%) and 48 (22.4%), respectively. Receiver operating characteristic curve analysis revealed that both score systems and the CFS showed similar performance while predicting 3- and 6-month mortality. The scores from these indices correlated with survival time.

CONCLUSION

Predicting short-term mortality and long-term survival time for elderly patients is possible using the Thamer and Wick scores and the CFS.

Predictores de progresión de enfermedad renal en el paciente anciano

El riñón del anciano experimenta cambios estructurales y funcionales, que lo convierte en más vulnerable para la enfermedad renal. La mayoría de ancianos con enfermedad renal crónica fallece antes de desarrollar progresión renal. Sin embargo, el principal grupo de pacientes incidentes de nefropatía terminal es el de personas mayores de 65 años, representando la diabetes mellitus y las causas vasculares sus principales etiologías. En esta revisión se analizan elementos renales (filtrado glomerular, proteinuria/albuminuria, potasio, fracaso renal agudo y diuréticos) y factores geriátricos (estado funcional, cognitivo y fragilidad) como predictores de progresión de enfermedad renal. La identificación de estos factores contribuirá a establecer estrategias de prevención renal y al pronóstico de la enfermedad en la toma decisiones.

Shared decision-making in advanced chronic kidney disease in the elderly

Chronic kidney disease is common in people >65years of age. The development and improvement of dialysis techniques has allowed its generalisation to the entire population, when there is a situation of terminal nephropathy, without limit of use due to chronological age. Decision making in elderly patients with advanced chronic kidney disease is complex: in addition to renal parameters, both comorbidity and the presence of geriatric syndromes must be considered. This review addresses the management of information, the decision making of different treatment modalities that can be offered to these patients, and the time of initiation and/or withdrawal of dialysis.

Vascular Surgery and Geriatric Patients

As the population ages, surgical decision-making in vascular surgery has become more complex. Older patients may not have been offered vascular surgical intervention in the past because of prohibitive physiologic demands and poor health. Patients now have more aggressive management of vascular risk factors with medications, such as statin therapy, and less invasive endovascular or hybrid treatment options. Outcomes in elderly patients may not be comparable with younger patients for entities such as aortic aneurysm repair, carotid endarterectomy, or lower extremity revascularization. Despite this, desirable outcomes can be successfully achieved and should be offered to carefully selected elderly individuals.

Factors Associated with the Choice of Peritoneal Dialysis in Iran: Qualitative Study

BACKGROUND

Decision making about the type of dialysis in renal failure is a matter of great importance involving the patients, his/her family, and the health care team. Identifying the factors influencing decision making for undergoing peritoneal dialysis (PD) helps the development of this therapeutic method in patients.

AIM

The present study aims at explaining the factors influencing decision making about undergoing PD in End Stage Renal Failure patients.

METHOD

The present study is a qualitative research, which used content analysis method. A semi-structured and in-depth interview was conducted with the 19 participants that selected by purposefully sampling. All interviews were recorded subsequent to receiving consent of the participants and were analyzed using content analysis method.

RESULTS

The first codification process resulted in 345 codes, which finally decreased to 278 codes by continuous reading and removal of duplicates. Overall, two main categories and eight categories namely facilitating factors (viz. family atmosphere, hemodialysis problems, PD advantages, and social environment) and inhibitory factors (viz. inefficient family, PD requirements, attitudes towards hemodialysis, and the country treatment system) were selected from the total 19 sub-categories and 278 codes.

CONCLUSIONS

Results indicated that various personal, family-related, psychological, social, and economic factors could affect the decision on the type of dialysis in patients. Therefore, basic infrastructures such as social support, education, and even the specialist and positive perspective of the Ministry of Health are required to choose this therapeutic method.

Examining hemodialyzer membrane performance using proteomic technologies

The success and the quality of hemodialysis therapy are mainly related to both clearance and biocompatibility properties of the artificial membrane packed in the hemodialyzer. Performance of a membrane is strongly influenced by its interaction with the plasma protein repertoire during the extracorporeal procedure. Recognition that a number of medium-high molecular weight solutes, including proteins and protein-bound molecules, are potentially toxic has prompted the development of more permeable membranes. Such membrane engineering, however, may cause loss of vital proteins, with membrane removal being nonspecific. In addition, plasma proteins can be adsorbed onto the membrane surface upon blood contact during dialysis. Adsorption can contribute to the removal of toxic compounds and governs the biocompatibility of a membrane, since surface-adsorbed proteins may trigger a variety of biologic blood pathways with pathophysiologic consequences. Over the last years, use of proteomic approaches has allowed polypeptide spectrum involved in the process of hemodialysis, a key issue previously hampered by lack of suitable technology, to be assessed in an unbiased manner and in its full complexity. Proteomics has been successfully applied to identify and quantify proteins in complex mixtures such as dialysis outflow fluid and fluid desorbed from dialysis membrane containing adsorbed proteins. The identified proteins can also be characterized by their involvement in metabolic and signaling pathways, molecular networks, and biologic processes through application of bioinformatics tools. Proteomics may thus provide an actual functional definition as to the effect of a membrane material on plasma proteins during hemodialysis. Here, we review the results of proteomic studies on the performance of hemodialysis membranes, as evaluated in terms of solute removal efficiency and blood-membrane interactions. The evidence collected indicates that the information provided by proteomic investigations yields improved molecular and functional knowledge and may lead to the development of more efficient membranes for the potential benefit of the patient.

High-Flux Dialysis: Clinical, Biochemical, and Proteomic Comparison with Low-Flux Dialysis and On-Line Hemodiafiltration

Hemodiafiltration on-line (on-line HDF) is a more efficient treatment than low-flux hemodialysis (HD). Unfortunately, it cannot be proposed to all patients. The aim of this study was to evaluate the safety, efficiency, and mechanisms of removal of toxins with high-flux HD vs. low-flux HD and on-line HDF. Randomized cross-over study designed to evaluate efficiency and tolerability of high-flux HD vs. low-flux HD in aged patients; to compare by means of biochemical and proteomic analyses the efficiency and mechanisms of removal of toxins with high-flux HD vs. on-line HDF. The removal of small toxins was similar with high-flux and low-flux HD. β2-microglobulin was removed only with high-flux HD, which had an excellent tolerability. The efficiency of high-flux HD was similar to on-line HDF. Proteomic analysis demonstrated that only high-flux membranes remove and adsorb small proteins. High-flux HD may be an efficient alternative to on-line HDF.

The Combined Effect of High Ambient Temperature and Antihypertensive Treatment on Renal Function in Hospitalized Elderly Patients

Background

The aging kidney manifests structural, functional as well as pharmacological changes, rendering elderly patients more susceptible to adverse environmental influences on their health, dehydration in particular.

Hypothesis

Higher temperature is associated with renal function impairment in patients 65 years and older who routinely take thiazide and/or ACE-inhibitors/ARBs.

Methods

We obtained health data of patients older than 65 who were admitted to a large tertiary center during the years 2006–2011, with a previous diagnosis of hypertension, and treated with thiazide, ACE-inhibitors/ARBs or both. We collected environmental data of daily temperature, available from collaborative public and governmental institutions. In order to estimate the effect of daily temperature on renal function we performed linear mixed models, separately for each treatment group and creatinine change during hospital admission.

Results

We identified 26,286 admissions for 14, 268 patients with a mean age of 75.6 (±6.9) years, of whom 53.6% were men. Increment in daily temperature on admission of 5°C had significant effect on creatinine increase in the no treatment (baseline creatinine adjusted 0.824 mg/dL, % change 1.212, % change 95% C.I 0.082–2.354) and dual treatment groups (baseline creatinine adjusted 1.032mg/dL, % change 3.440, % change 95% C.I 1.227–5.700). Sub-analysis stratified by advanced age, chronic kidney disease and primary diagnosis on hospital admission, revealed a significant association within patients admitted due to acute infection and treated with dual therapy.

Conclusion

Whereas previous studies analyzed sporadic climate effects during heat waves and/or excluded older population taking anti-hypertensive medications, the present study is novel by showing a durable association of temperature and decreased renal function specifically in elderly patients taking anti-hypertensive medications.

Burden of multimorbidity and outcome in ambulatory geriatric hemodialysis patients : Report from the QiN registry in Germany

BACKGROUND

Patients with end-stage renal disease (ESRD) requiring hemodialysis are typically characterized by multimorbidity and increasingly by advanced age; however, there are few data on their geriatric needs.

OBJECTIVE

The aim of the study was to evaluate the clinical characteristics of a large cohort of incident patients in ambulatory hemodialysis units with a particular focus on those aged over 80 years in Germany.

METHODS

The electronic patient registry of the Board of Trustees (Kuratorium) for Dialysis and Kidney Transplantation (KfH) was searched for all patients who began hemodialysis in 1 of the 191 units between 2007 and 2013 and were 65 years and older. Patients were analyzed by age (65-79 years and ≥80 years) for clinical and biochemical characteristics, mortality, quality of life and hospitalizations.

RESULTS

Of the 21,355 incident patients, a total of 13,872 (65%) were over 65 years old, with 9998 (46.8%) aged between 65 and 79 years and 3874 (18.1%) patients 80 years or older (oldest old). The spectrum of morbidity was comparable between the two age groups but there was a significantly higher prevalence of anemia, hypoalbuminemia and multimorbidity (>four comorbidities) in the older age group. Median survival was 4.5 years (1638 days) in the younger age group and 2.7 years (978 days) in the older group. Almost half of the patients experienced at least one episode of hospitalization during the first year but there were no significant differences between the age groups (45.9% in younger vs. 47% in older patients). In the older age group 463 (12%) patients survived more than 5 years after initiation of hemodialysis despite the presence of multiple risk factors for adverse clinical outcome.

CONCLUSION

More than half of the chronic ambulatory hemodialysis patients were of advanced age and had a very high burden of multimorbidity. Nevertheless, a subgroup of ERSD patients over 80 years old survived at least 5 years on hemodialysis despite the presence of multiple risk factors for adverse clinical outcome. Identification of these patients as well as optimized care for frail hemodialysis patients will require application of geriatric assessment tools in addition to traditional parameters in nephrology. The development and validation of such tools should be the subject of further clinical studies.

Special considerations for the treatment of chronic kidney disease in the elderly

Chronic kidney disease (CKD) is common in older adults, and its burden is expected to increase in older populations. Even if the knowledge on the approach to older patient with CKD is still evolving, current guidelines for pharmacological management of CKD does not include specific recommendations for older patients. Additionally, decision-making on renal replacement therapy (RRT) for older patients is far from being evidence-based, and despite the improvement in dialysis outcomes, RRT may cause more harm than benefit compared with conservative care when prognostic stratification is not carefully assessed. The use of comprehensive geriatric assessment tools could help clinicians in applying a more informed decision-making. Finally, physical exercise and rehabilitation interventions also represents a promising therapeutic strategy.