Lower access to kidney transplantation for women in France is not explained by comorbidities and social deprivation.

BACKGROUND: Access to kidney transplantation (KT) remains challenging for patients with end-stage kidney disease. This study assessed women's access to KT in France by considering comorbidities and neighborhood social deprivation. METHODS: All incident 18-85-year-old patients starting dialysis in France between January 1, 2017 and December 31, 2019 were included. Three outcomes were assessed: (i) access to the KT waiting list after dialysis start, (ii) KT access after waitlisting, and (iii) KT access after dialysis start. Cox and Fine and Gray models were used. Gender-EDI and gender-age interactions were tested and analyses were performed among strata if required. RESULTS: 29,395 patients were included (35% of women). After adjusting for social deprivation and comorbidities, women were less likely to be waitlisted at 1 (adjHR: 0.91 [0.87-0.96]) and 3 years (adjHR: 0.87 [0.84-0.91]) post-dialysis initiation. This disparity concerned mainly ≥60-year-old women (adjHR: 0.76 [0.71-0.82] at 1 year and 0.75 [0.71-0.81] at 3 years). Access to KT, after 2 years of waitlisting was similar between genders. Access to KT was similar between genders at 3 years after dialysis start, but decreased for women after 4 years (adjHR: 0.93 [0.88-0.99]) and longer follow-up (adjHR: 0.90 [0.85-0.96]). CONCLUSIONS: In France, women are less likely to be waitlisted and undergo kidney transplantation. This is driven by the ≥60-year-old group and is not explained by comorbidities or social deprivation level.

Renal transplantation outcome and social deprivation in the French healthcare system: a cohort study using the European Deprivation Index.

The study objective was to estimate the effect of social deprivation estimated by the European Deprivation Index (EDI) on the risk of death and graft failure on renal transplantation in France. EDI was calculated for 8701 of 9205 patients receiving a first renal transplantation between 2010 and 2014. Patients were separated in EDI quintiles of the general population. A Cox model (cs-HR: cause-specific hazard ratio of death or graft failure) and a Fine and Gray model (sd-HR: subdistribution hazard ratio of death and graft failure) were used for the analysis. The 5th quintile group (most deprived) accounted for 32% of patients [2818 of 8701]. In the multivariate analysis, compared with quintile 1, the risk of death was higher for the 5th quintile group in the complete cohort [cs-HR: 1.31, 95% CI: (1.01-1.70), sd-HR: 1.29, 95% CI: (1.00-1.68)], in the deceased donor group [cs-HR: 1.31, 95% CI: (1.00-1.71), sd-HR: 1.30, 95% CI: (1.00-1.70)] but not in living donor transplant patients. There was no association between the EDI groups and the risk of transplant failure. Social deprivation estimated by the EDI is associated with an increased risk of death in transplantation in France but not with the chance of allograft loss.

Horizontal mixture model for competing risks: a method used in waitlisted renal transplant candidates.

When a patient is registered on renal transplant waiting list, she/he expects a clear information on the likelihood of being transplanted. Nevertheless, this event is in competition with death and usual models for competing events are difficult to interpret for non-specialists. We used a horizontal mixture model. Data were extracted from two French dialysis and transplantation registries. The "Ile-de-France" region was used for external validation. The other patients were randomly divided for training and internal validation. Seven variables were associated with decreased long-term probability of transplantation: age over 40 years, comorbidities (diabetes, cardiovascular disease, malignancy), dialysis longer than 1 year before registration and blood groups O or B. We additionally demonstrated longer mean time-to-transplantation for recipients under the age of 50, overweight recipients, recipients with blood group O or B and with pre-transplantation anti-HLA class I or II immunization. Our model can be used to predict the long-term probability of transplantation and the time in dialysis among transplanted patients, two easily interpretable parts. Discriminative capacities were validated on both the internal and external (AUC at 5 years = 0.72, 95% CI from 0.68 to 0.76) validation samples. However, calibration issues were highlighted and illustrated the importance of complete re-estimation of the model for other countries. We illustrated the ease of interpretation of horizontal modelling, which constitutes an alternative to sub-hazard or cause-specific approaches. Nevertheless, it would be useful to test this in practice, for instance by questioning both the physicians and the patients. We believe that this model should also be used in other chronic diseases, for both etiologic and prognostic studies.

Prevalence of chronic kidney disease in France: methodological considerations and pitfalls with the use of Health claims databases.

Background: Health policy-making require careful assessment of chronic kidney disease (CKD) epidemiology to develop efficient and cost-effective care strategies. The aim of the present study was to use the RENALGO-EXPERT algorithm to estimate the global prevalence of CKD in France. Methods: An expert group developed the RENALGO-EXPERT algorithm based on healthcare consumption. This algorithm has been applied to the French National Health claims database (SNDS), where no biological test findings are available to estimate a national CKD prevalence for the years 2018-2021. The CONSTANCES cohort (+219 000 adults aged 18-69 with one CKD-EPI eGFR) was used to discuss the limit of using health claims data. Results: Between 2018 and 2021, the estimated prevalence in the SNDS increased from 8.1% to 10.5%. The RENALGO-EXPERT algorithm identified 4.5% of the volunteers in the CONSTANCES as CKD. The RENALGO-EXPERT algorithm had a positive predictive value of 6.2% and negative predictive value of 99.1% to detect an eGFR<60 ml/min/1.73 m². Half of 252 false positive cases (ALGO+, eGFR > 90) had been diagnosed with kidney disease during hospitalization, and the other half based on healthcare consumption suggestive of a 'high-risk' profile; 95% of the 1661 false negatives (ALGO-, eGFR < 60) had an eGFR between 45 and 60 ml/min, half had medication and two-thirds had biological exams possibly linked to CKD. Half of them had a hospital stay during the period but none had a diagnosis of kidney disease. Conclusions: Our result is in accordance with other estimations of CKD prevalence in the general population. Analysis of diverging cases (FP and FN) suggests using health claims data have inherent limitations. Such an algorithm can identify patients whose care pathway is close to the usual and specific CKD pathways. It does not identify patients who have not been diagnosed or whose care is inappropriate or at early stage with stable GFR.

Pneumococcal vaccination coverage at the initiation of chronic dialysis, and its association with mortality during the first year.

OBJECTIVES: Pneumococcal immunization is recommended in dialysis patients. We aimed to estimate pneumococcal vaccination coverage among patients who initiate dialysis in France, and its association with mortality. METHODS: Data were extracted from two prospective national databases, merged using a deterministic linkage method: renal epidemiology and information network (REIN) registry, which includes all patients on dialysis and kidney transplants recipients in France, and the national health insurance information system (SNIIRAM) which collects individual data on health expenditure reimbursement, including vaccines. We enrolled all patients who initiated chronic dialysis in 2015. Data on health status at dialysis initiation, dialysis modalities, and pneumococcal vaccine prescribed from 2 years before to 1 year after dialysis start were collected. Univariate and multivariate Cox proportional hazard models were used to assess one-year all-cause mortality. RESULTS: Among the 8,294 incident patients included, 1,849 (22.3 %) received at least one pneumococcal vaccine before (n = 542, 6.5 %), or after (n = 1,307, 15.8 %) dialysis start, as follows: 13-valent pneumococcal conjugated vaccine (PCV13) followed by 23-valent pneumococcal polysaccharide vaccine (PPSV23), n = 938 (50.7 %); only PPSV23, n = 650 (35.1 %); or only PCV13, n = 261 (14.1 %). Vaccinated patients were younger (mean, 66.5 ± 14.8 years vs. 69.0 ± 14.9 years, P ≤ 0.001), more likely to suffer from glomerulonephritis (17.0 % vs. 11.0 %, P ≤ 0.001), and less likely to start dialysis in emergency (27.2 % vs. 31.1 %, P = 0.001). On multivariate analysis, patients who received PCV13 and PPSV23, or only PCV13 were less likely to die (respectively, HR = 0.37; 95 %CI 0.28-0.51, and HR = 0.35; 95 %CI 0.19-0.65). CONCLUSIONS: Pneumococcal immunization with PCV13 followed by PPSV23, or with PCV13 alone, but not with PPSV23 alone, is independently associated with decreased one year-mortality in patients who start dialysis.

Social deprivation reduced registration for kidney transplantation through markers of nephrological care: a mediation analysis.

OBJECTIVES: We assessed the direct and indirect effect of social deprivation mediated by modifiable markers of nephrological follow-up on registration on the renal transplantation waiting-list. STUDY DESIGN AND SETTINGS: From the Renal Epidemiology and Information Network, we included French incident dialysis patients eligible for a registration evaluation between January 2017 and June 2018. Mediation analyses were conducted to assess effects of social deprivation estimated by quintile 5 (Q5) of the European Deprivation Index on registration defined as wait-listing at dialysis start or within the first 6 months. RESULTS: Among the 11,655 included patients, 2,410 were registered. The Q5 had a direct effect on registration (odds ratio [OR]: 0.82 [0.80-0.84]) and an indirect effect mediated by emergency start dialysis (OR: 0.97 [0.97-0.98]), hemoglobin <11 g/dL and/or lack of erythropoietin (OR 0.96 [0.96-0.96]) and albumin <30 g/L (OR: 0.98 [0.98-0.99]). CONCLUSION: Social deprivation was directly associated with a lower registration on the renal transplantation waiting-list but its effect was also mediated by markers of nephrological care, suggesting that improving the follow-up of the most deprived patients should help to reduce disparities in access to transplantation.

Impact of the Kidney Transplantation Moratorium in France Because of the COVID-19 Pandemic: A Cohort-based Study.

BACKGROUND: The COVID-19 pandemic has resulted in worldwide kidney transplantation (KT) moratoriums. The impacts of these moratoriums on the life expectancy of KT candidates remain unclear. METHODS: We simulated the evolution of several French candidate populations for KT using a multistate semi-Markovian approach and according to moratorium durations ranging from 0 to 24 mo. The transition rates were modeled from the 63 927 French patients who began dialysis or were registered on the waiting list for KT between 2011 and 2019. RESULTS: Among the 8350 patients active on the waiting list at the time of the French KT moratorium decided on March 16, 2020, for 2.5 mo, we predicted 4.0 additional months (confidence interval [CI], 2.8-5.0) on the waiting list and 42 additional deaths (CI, -70 to 150) up to March 16, 2030, compared with the scenario without moratorium. In this population, we reported a significant impact for a 9-mo moratorium duration: 135 attributable deaths (CI, 31-257) up to March 16, 2030. Patients who became active on the list after March 2020 were less impacted; there was a significant impact for an 18-mo moratorium (175 additional deaths [CI, 21-359]) in the 10 862 prevalent end-stage renal disease patients on March 16, 2020 and for a 24-mo moratorium (189 additional deaths [CI, 10-367]) in the 16 355 incident end-stage renal disease patients after this date. CONCLUSION: The temporary moratorium of KT during a COVID-19 peak represents a sustainable decision to free up hospitals' resources if the moratorium does not exceed a prolonged period.

[Monitoring of hypertension in patients orally treated by angiogenesis inhibitor in daily practice]. / Surveillance de l'hypertension artérielle chez les patients traités par anti-angiogénique par voie orale en pratique quotidienne.

OBJECTIVE: The aim of this study is to measure the monitoring and the incidence of renovascular effects of angiogenesis inhibitors in real population. METHOD: Are included in this descriptive, monocentric, practical study, patients of 18 years old and more, orally treated by angiogenesis inhibitors and monitored in consultation by clinician nurses. The main interest variable is the incidence of hypertension at three months of treatment. RESULTS: From January, 2011 to July, 2014, 324 patients have been included, whose 53% are men. Mean age is 62±13 years old. Antecedents are: 37% of hypertension, 17% of chronic renal insufficiency, 21% of nephrectomy, 13% of diabetes. Most frequent cancers are kidney (31%), liver (23%) and breast (16%). Most used molecules are: sorafenib (30%), sunitinib (23%) and everolimus (16%). Blood pressure has been measured at the beginning of the treatment in 157 patients (48%). Among them, during the first three months of treatment, 55 (35%) present hypertension according to the oncological definition and 59 (38%) according to the classical definition; 30 patients (19%) are considered as hypertensive according to only one of the two definitions. In multivariable analysis, variables significantly associated with hypertension are: age (OR=1.04; 95% CI 1.02-1.08; P<0.01) and antecedent of nephrectomy (OR=4.29; 95%CI 1.86-9.92; P<0.01). CONCLUSION: In this cohort, only 48% of the patients had blood pressure determination before treatment. Hypertension under angiogenesis inhibitors is probably underestimated. Age and antecedent of nephrectomy seem to be correlated with the occurrence of hypertension.

[Socioeconomic inequalities and kidney transplantation]. / Précarité et greffe rénale : pourquoi et comment estimer son effet sur la santé des populations ?

Studies at the population level must take into account the effect of social insecurity and socioeconomic inequalities on the patient outcomes. Socioeconomic inequalities depend on many determinants that are socially determined. In renal transplantation, these social determinants are not registered in the databases. The European Deprivation Index (EDI) is a composite index of social vulnerability with a French version. The EDI is an ecological measure of deprivation including the individual perception of basic needs for daily life that is called "subjective poverty". The Townsend index, Carstairs index and the Index of Multiple Deprivation are other ecological index available. It has been demonstrated in the United States that socioeconomic indicators of deprivation were associated with both the access to the waiting list for renal transplantation and transplantation failure. In France, socioeconomic deprivation may also affect the access to the waiting list and outcome of transplantation. This article is a review about deprivation and renal transplantation.

[Reasons for first-consultation in nephrology in the health area 5 of Britanny during the year 2014]. / Motifs de primo-consultations de néphrologie en 2014 dans le territoire de santé 5 de Bretagne.

BACKGROUND: In France, the coordinated healthcare circuit means that patients should be referred to specialists, for example nephrologists, by another physician. However, there are no recommendations concerning the reasons justifying the referral to a nephrologist. The main purpose of our study is to describe the motif of first consultations in nephrology in the health area 5 of Brittany. METHODS: We retrospectively collected medical reports of first consultations by 17 nephrologists in the 4 centers of the study area, during the year 2014. In these letters, we noted the consultation motif, the specialty of the physician who refers the patient, and main characteristics of patients. RESULTS: We included 662 first consultations. The main reason for consultations was chronic kidney disease (68.7%), including chronic renal insufficiency (56.9%), proteinuria (7.3%), microscopic hematuria (3.3%) and searching for chronic kidney disease in the presence of risk factor (1.2%). Other frequent reasons were the follow-up consultation after a pregnancy complicated by preeclampsia (9.5%), urinary lithiasis (5.7%), hypertension (3.8%) and hydroelectrolytic disorder (3.5%). Non-nephrology reasons represent 3.2% of first consultations. Almost all patients have been referred by a physician (99.7%), mainly a general practitioner (71.9%). CONCLUSION: Nephrology first consultations are realized according to the coordinated healthcare circuit since almost all are requested by another physician. The reasons are adapted to the specialty. The main reason is chronic kidney disease, often already associated with renal insufficiency chronic.