A decade of arteriovenous fistula creations in the ⩾75 years population: Equal opportunity or sub-optimal use of resources

BACKGROUND

The optimal vascular access in the elderly remains contentious in the context of increasingly limited resources and anticipated survival on hemodialysis. Research focus has shifted to include the impact of vascular access on quality of life. This study explored clinical outcomes in individuals aged ⩾75 years who had an arteriovenous fistula (AVF) created in a single center over a 10-year period.

MATERIALS AND METHODS

Demographic and clinical data concerning AVFs created January 2009-December 2019 were identified from a prospective database for retrospective analysis. Outcome measures were AVF patency and failure to mature rates plus overall patient and vascular access survival. The Vascular Access Specific Quality of life measure (VASQoL) was completed in a contemporary cohort aged ⩾75 years established on HD in October 2021.

RESULTS

AVF outcomes were available for 272 patients (93%). The failure to mature (FTM) rate was 36% with the significant predictors of AVF FTM being the creation of a radiocephalic AVF (OR 8.13, 95% CI 8.02-8.52, p < 0.01), female gender (OR 4.84, 95% CI 4.70-5.41, p < 0.01), and a history of peripheral vascular disease (OR 5.25, 95% CI 5.22-6.00, p value = 0.02). Functional patency was associated with a median 12-month survival benefit compared to those whose fistula FTM (p < 0.01). The median patency duration for a functionally patent AVF was 3 years. Elderly patients with a fistula reported a lower quality of life in VASQoL scoring than those with central venous catheters.

CONCLUSIONS

In this cohort, AVF creation in individuals aged ⩾75 years AVFs was associated with comparable AVF patency rates to younger patients. AVF functional patency was associated with superior patient survival compared to those with AVF FTM. A multi-disciplinary surveillance program may help reduce AVF loss. Further work on how vascular access choice impacts quality of life in elderly patients is required.

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.

Pre-Frailty and Frailty in Dialysis and Pre-Dialysis Patients: A Systematic Review of Clinical and Biochemical Markers

Patients under dialysis are known to be more vulnerable to frailty, a dynamic geriatric syndrome defined as a state of vulnerability to stressors, due to numerous metabolic changes. With rise of life expectancy globally, it is important to understand the complexity of the pathophysiology of frailty and identify possible markers that can help with the prognosis and diagnosis of frailty. The aim of this systematic review is to give an overview of the knowledge regarding clinical and biochemical markers associated with pre-frailty and frailty in dialysis and pre-dialysis patients. In November 2020, PubMed, Embase and Web of Science were searched. Studies regarding biomarkers associated with (pre-)frailty in (pre-)dialysis patients were included. This systematic review identified clinical and biochemical markers in pre-frail and frail patients under dialysis or pre-dialysis published in the literature. This study shows that more investigation is necessary to identify markers that can differentiate these processes to be used as a diagnostic and prognostic tool in routine care and management of geriatric needs. Interventions that can improve health outcomes in pre-frail and frail older adults under dialysis or pre-dialysis are essential to improve not only the individual's quality of life but also to reduce the burden to the health systems.

The Frailty Phenotype in Hemodialysis Patients and its Association with Biochemical Markers of Mineral Bone Disorder, Inflammation and Nutrition

INTRODUCTION

Frailty is a state of increased vulnerability to physical stressors. It is common in patients with end-stage renal disease (ESRD) who are on hemodialysis (HD).The aim of this study was to analyze the presence of frailty phenotype among HD patients and to evaluate their interrelationship with different biochemical markers.

METHODS

For the frailty assessment the Frailty Phenotype by Fried et al. was used, where frailty was reported if three of the following criteria were met: unintentional weight loss, self-reported exhaustion, weakness, slow walking speed and low physical activity. From 281 HD patients, 126 patients were frail, 58 were pre-frail (two criteria were met) and the rest of the study population were robust (97 patients). BMI was calculated for all patients and venous blood samples were taken to determine laboratory parameters for bone alkaline phosphatase (BAP), phosphate (P), potassium (K), C-reactive protein (CRP) and albumin.

RESULTS

Patients who were on HD longer than 60 months have more characters of frailty. (p=0.019). A statistically significant positive correlations between frailty score and BAP (rho = 0.189; p = 0.001), and CRP (rho = 0.233; p < 0.001) were observed, and significant negative correlations between frailty score and albumin (rho = - 0.218; p < 0.001) and K (rho = - 0.198; p = 0.001).

CONCLUSIONS

The associations of frailty with markers of mineral bone disorder, inflammation and nutrition indicate the importance of these parameters in the indirect assessment of the frailty phenotype in HD patients.