[Towards an extension of the REIN registry to patients with chronic kidney disease at stage 5 not treated with dialysis or transplantation? A pilot study]

Twenty years of the French Renal Epidemiology and Information Network

Background

The French Renal Epidemiology and Information Network (REIN) is 20 years old. It is not just a national data registry, but rather an epidemiological and informational network serving patients with chronic kidney disease, nephrology teams and health services.

Methods

The past 10-year trends of the incidence and prevalence of renal replacement therapy by dialysis or kidney transplantation and waitlist activity are presented. To detect potential significant changes in trends from 2012 and 2021, a Joinpoint regression model was used.

Results

The overall incidence of treated end-stage kidney disease (ESKD) was 169 per million population (pmp) in 2021. It was stable despite an increase in the incidence of diabetes. We found a decreasing trend in the proportion of patients starting dialysis in an emergency but an increase in those starting haemodialysis (HD) with a temporary catheter. Peritoneal dialysis decreased by 1.7% each year, whereas home HD, although involving only 1% of dialysis patients, increased by 10% each year. For patients not treated at home, the median time to drive from the patient's home to the dialysis unit was 17 min. The proportion of patients on the transplantation waitlist at the start of dialysis increased from 7% to 12%. Among the 111 263 new ESKD patients from 2012 to 2021, 8% received a first transplant at 1 year and 20% at 5 years. Among kidney transplant recipients, the mean time on the waitlist increased from 13.8 to 22.6 months. Living donor transplants increased in frequency, representing 15% of kidney transplants.

Conclusions

Data from the REIN registry allow for the evaluation of needs and provide a planning tool for French authorities. The progressive implementation of automatic data retrieval from dialysis informatics charts might alleviate the burden of data collection. Furthermore, the research activity the REIN engenders, resulting in renewed confidence by health authorities in the dynamism of French nephrology, allows for an optimistic outlook for the REIN.

Incidence of End Stage Kidney Disease and context of dialysis initiation

On the occasion of the 20th anniversary of the REIN (French Renal Epidemiology and Information Network), a summary work on the contributions of the national French ESKD register was carried out. On the issue of ESKD incidence, the following key messages were retained. Thanks to several studies conducted using data from the REIN registry, the spatial variations of incidence of stage 5 chronic kidney disease in the replacement stage could be explained, in part, by the health condition of the general population as well as by the socio-economic context and differences in practices. Just like what is observed in other countries, the incidence is stabilising, or even decreasing, especially among people who do not have diabetes. Thanks to the registry having provided an indicator on the initiation of the dialysis, a decrease in the rate of initiation of emergency dialysis (i.e., initiated less than 24 hours after a nephrology evaluation considering a vital risk for the patient) has been observed, resulting from an effort to understand and better anticipate the starting of the replacement.

What does the French REIN registry tell us about Stage 4-5 CKD care in older adults?

The aim of this paper is to illustrate all the clinical epidemiology searches made within the French network REIN to improve CKD stage 4-5 care in older adults. We summarize various studies describing clinical practice, care organization, prognosis and health economics evaluation in order to develop personalized care plans and decision-making tools. In France, for 20 years now, various databases have been mobilized including the national REIN registry which includes all patients receiving dialysis or transplantation. REIN data are indirectly linked to the French administrative healthcare database. They are also pooled with data from the PSPA cohort, a multicenter prospective cohort study of patients aged 75 or over with advanced CKD, monitored for 5 years, and the CKD-REIN clinical-based prospective cohort which included 3033 patients with CKD stage 3-4 from 2013 to 2016. During our various research work, we identified heterogeneous trajectories specific to this growing older population, raising ethical, organizational and economic issues. Renal registries will help clinicians, health providers and policy-makers if suitable decision- making tools are developed and validated.

[Comprehensive conservative care of stage 5-CKD: A practical guide]

In French-speaking countries, the anglicism "traitement conservateur" is commonly used in clinical practice for CKD 5 patients, meaning comprehensive conservative care. In 2015, the publication of KDIGO controversies put forward this "new" therapeutic option at the same level as dialysis or transplantation. However, its detailed contents remain heterogeneous due to cultural and ethical considerations, varying with regional or national health systems. This is the reason why the French-speaking society of Nephrology, Dialysis, Transplantation (SFNDT) set up an international debate to publish clinical guidelines in French.