Luc Frimat

Université René Descartes - Paris 5, Lutetia Parisorum, Île-de-France, France

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Publications (143)300.8 Total impact

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    ABSTRACT: The evolution of idiopathic membranous membranous (MNi) is variable, treatment is discussed. Our work's main objective was to evaluate the results of a standardized management strategy proposed in 2006 in Lorraine (Nephrolor health network). The secondary objective was to evaluate the professional practices.
    Néphrologie & Thérapeutique 12/2014; · 0.55 Impact Factor
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    ABSTRACT: The evolution of idiopathic membranous membranous (MNi) is variable, treatment is discussed. Our work's main objective was to evaluate the results of a standardized management strategy proposed in 2006 in Lorraine (Nephrolor health network). The secondary objective was to evaluate the professional practices. This study compared the evolution of incident MNi between 2002 and 2005 (Before) and between 2007 and 2010 (After), the respective dates point to 31/12/2011 and 31/12/2006. In nephrotics patients without renal failure, the risk assessment of end stage renal disease based on urinary β2-microglobulin (uβ2 m, threshold to 0,5 μg/min). Patients at high risk should receive immunosuppressive therapy (IS). Seventy-four biopsy-proven MNi were diagnosed with 50 nephrotic (22 Before and 28 After) of which 20 had normal renal function. In these nephrotic, there was no significant difference in the probability and the average time of remission between the two groups (P=0.26). Dosage of uβ2m was performed in 35% of cases. Fifty percent were treated with IS respecting strategy. Despite differences between the strategy and practices, which may explain these non-significant results, we observed changes in thinking and therapeutic attitude of the clinician. The implementation of this strategy tends to standardize and improve practices about MNi in Lorraine, which seems to improve results in remission. We encourage to generalize the application of this strategy and to continue this cohort follow. Copyright © 2014 Association Société de néphrologie. Published by Elsevier SAS. All rights reserved.
    Nephrologie & therapeutique. 12/2014;
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    ABSTRACT: Elevated parathyroid hormone levels may be associated with adverse clinical outcomes in patients on dialysis. After the introduction of practice guidelines suggesting higher parathyroid hormone targets than those previously recommended, changes in parathyroid hormone levels and treatment regimens over time have not been well documented. Using data from the international Dialysis Outcomes and Practice Patterns Study, trends in parathyroid hormone levels and secondary hyperparathyroidism therapies over the past 15 years and the associations between parathyroid hormone and clinical outcomes are reported; 35,655 participants from the Dialysis Outcomes and Practice Patterns Study phases 1-4 (1996-2011) were included. Median parathyroid hormone increased from phase 1 to phase 4 in all regions except for Japan, where it remained stable. Prescriptions of intravenous vitamin D analogs and cinacalcet increased and parathyroidectomy rates decreased in all regions over time. Compared with 150-300 pg/ml, in adjusted models, all-cause mortality risk was higher for parathyroid hormone=301-450 (hazard ratio, 1.09; 95% confidence interval, 1.01 to 1.18) and >600 pg/ml (hazard ratio, 1.23; 95% confidence interval, 1.12 to 1.34). Parathyroid hormone >600 pg/ml was also associated with higher risk of cardiovascular mortality as well as all-cause and cardiovascular hospitalizations. In a subgroup analysis of 5387 patients not receiving vitamin D analogs or cinacalcet and with no prior parathyroidectomy, very low parathyroid hormone (<50 pg/ml) was associated with mortality (hazard ratio, 1.25; 95% confidence interval, 1.04 to 1.51). In a large international sample of patients on hemodialysis, parathyroid hormone levels increased in most countries, and secondary hyperparathyroidism treatments changed over time. Very low and very high parathyroid hormone levels were associated with adverse outcomes. In the absence of definitive evidence in support of a specific parathyroid hormone target, there is an urgent need for additional research to inform clinical practice. Copyright © 2014 by the American Society of Nephrology.
    Clinical Journal of the American Society of Nephrology 12/2014; · 5.25 Impact Factor
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    ABSTRACT: The French Renal Epidemiology and Information Network (REIN) registry began in 2002 to provide a tool for public health decision support, evaluation and research related to renal replacement therapies (RRT) for end-stage renal disease (ESRD). It is relying on a network of nephrologists, epidemiologists, patients and public health representatives. Continuous registration covers all dialysis and transplanted patients. In 2012, in France, 10,048 patients started a RRT (154 per million inhabitants). Elders provided majority of new patients (median age at RRT start: 70 years old). New patients had a high and age increasing rate of comorbidities, especially diabetes (42% of the new patients) and cardiovascular comorbidities (>50% of the new patients). Like previous years, incidence is stabilized. On December 31, 2012, 73,491 patients were receiving a RRT in France (1127 per million inhabitants, 56% on dialysis and 44% living with a functional renal transplant). More than 50% of patients were undergoing in-center hemodialysis with significant variations among regions. An increase in medical satellite unit hemodialysis but a decrease in self-care unit hemodialysis rates were noticed across the time, whereas peritoneal dialysis remained stable at 7%. Five years after starting RRT, the overall survival rate was 51% but only 16% among patients over 85 years. Mortality rate was highly dependent on treatment and age; transplanted patients aged 60-69 had a 27/1000 patients-year mortality rate versus 133 for a dialysis patient. Patients who started dialysis had a probability of first wait-listing of 4.8% at the start of dialysis (pre-emptive registrations) and 27% at 72 months. Whatever their diabetes status was, patients older than 60 had poor access to the waiting list. Seventeen percent of the patients received a first renal transplant within 15.4 month median time; 3% had received a pre-emptive graft. Ten years after the start of the French ESRD registry, this report provides a comprehensive and nation-wide overview of dialysis and transplantation cares in France, including overseas. Copyright © 2014 Association Société de néphrologie. Published by Elsevier SAS. All rights reserved.
    Néphrologie & Thérapeutique 11/2014; · 0.55 Impact Factor
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    ABSTRACT: Recommendations for secondary hyperparathyroidism (SHPT) consider that a "one-size-fits-all" target enables efficacy of care. In routine clinical practice, SHPT continues to pose diagnosis and treatment challenges. One hypothesis that could explain these difficulties is that dialysis population with SHPT is not homogeneous.
    BMC Nephrology 08/2014; 15(1):132. · 1.52 Impact Factor
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    ABSTRACT: Objective The goal of this study is to compare patient-reported quality of life (PRQOL) evolution between two groups of end-stage renal disease patients with secondary hyperparathyroidism (SHPT). The first with a cinacalcet prescription within 3 months after a diagnosis of SHPT (early group) and a second group of patients with a later or no cinacalcet prescription (nonearly group).Patients and methodsFrom 2009 to 2012, we conducted a multicenter pharmaco-epidemiologic study in Lorraine region (France) including all consecutive patients on maintenance dialysis for at least 3 months with a diagnosis of SHPT (PTH > 500 pg/ml or first cinacalcet prescription). PRQOL was estimated using the Kidney Disease Quality Of Life-Short Form questionnaire, at baseline and at 6 and 12 months follow-up. Change in PRQOL was compared between the groups and adjusted with a propensity score.ResultsWe included 124 patients: 44 in the early group and 80 in the nonearly group. The mental component summary score was lower in the early group, at baseline (43.6 ± 6.6 vs 46.6 ± 7.6; p = 0.030), and at the follow-up assessment (42.6 ± 6.9 vs 45.7 ± 7.9; p = 0.033). We found no difference between the groups in change in PRQOL, for all dimensions, even after adjustment with the propensity score. Mean serum alkaline phosphatase levels were normal in both groups at baseline (80.9 ± 32.5 vs 95.1 ± 39.6; p = 0.41).Conclusion Cinacalcet prescription immediately following diagnosis of SHPT does not seem to be associated with better PRQOL evolution at 1 year. Mean serum alkaline phosphatase levels suggest that physicians should consider waiting for another PTH assay result before starting cinacalcet in case of a PTH rise. Copyright © 2014 John Wiley & Sons, Ltd.
    Pharmacoepidemiology and Drug Safety 08/2014; · 2.90 Impact Factor
  • Néphrologie & Thérapeutique 07/2014; · 0.55 Impact Factor
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    ABSTRACT: Myeloma following kidney transplantation is a rare entity. It can be divided into two groups: relapse of a previous myeloma and de novo myeloma. Some of these myelomas can be complicated by a monoclonal immunoglobulin deposition disease, which is even less common. Less than ten cases of monoclonal immunoglobulin deposition disease after renal graft have been reported in the literature. The treatment of these patients is not well codified.
    Journal of Medical Case Reports 06/2014; 8(1):205.
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    ABSTRACT: Several studies have suggested that orthostatic hypotension may be an independent predictor of cardiovascular or cerebrovascular risk and all-cause mortality, particularly in a geriatric population. In 1996, a consensus defined orthostatic hypotension as a SBP fall at least 20 mmHg and/or a DBP fall at least 10 mmHg within 3 min of standing.
    Journal of Hypertension 05/2014; · 4.22 Impact Factor
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    ABSTRACT: Aims/hypothesis The aim was to study geographic variations and recent trends in the incidence of end-stage renal disease (ESRD) by diabetes status and type, and in patient condition and modalities of care at initiation of renal replacement therapy. Methods Data from the French population-based dialysis and transplantation registry of all ESRD patients were used to study geographic variations in 5,857 patients without diabetes mellitus, 227 with type 1 diabetes mellitus, and 3,410 with type 2. Trends in incidence and patient care from 2007 to 2011 were estimated. Results Age- and sex-adjusted incidence rates were higher in the overseas territories than in continental France for ESRD unrelated to diabetes and related to type 2 diabetes, but quite similar for type 1 diabetes-related ESRD. ESRD incidence decreased significantly over time for patients with type 1 diabetes (−10% annually) and not significantly for non-diabetic patients (0.2%), but increased significantly for patients with type 2 diabetes (+7% annually until 2009 and seemingly stabilised thereafter). In type 2 diabetes, the net change in the absolute number was +21%, of which +3% can be attributed to population ageing, +2% to population growth and +16% to the residual effect of the disease. Patients with type 2 diabetes more often started dialysis as an emergency (32%) than those with type 1 (20%) or no diabetes. Conclusions/interpretation The major impact of diabetes on ESRD incidence is due to type 2 diabetes mellitus. Our data demonstrate the need to reinforce strategies for optimal management of patients with diabetes to improve prevention, or delay the onset, of diabetic nephropathy, ESRD and cardiovascular comorbidities, and to reduce the rate of emergency dialysis.
    Diabetologia 04/2014; 57(4). · 6.88 Impact Factor
  • Bruno Moulin, Luc Frimat
    Néphrologie & Thérapeutique 04/2014; 10(2):71-3. · 0.55 Impact Factor
  • Néphrologie & Thérapeutique. 01/2014;
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    ABSTRACT: The antiphospholipid syndrome is a thrombophilia characterized by the combination of arterial and/or venous thrombotic events or obstetric clinical events, associated with persistent presence of antiphospholipid antibodies. In this syndrome, thromboses may affect all of the vascular tree, renal damage is frequently associated with a specific antiphospholipid syndrome nephropathy. We propose in this review to provide updated recommendations on the management of antiphospholipid syndrome in nephrology. Treatment is based on long-term anticoagulant therapy with or without antiplatelet agents according to clinical events. The use of a conventional nephroprotection must not be forgotten (strict control of blood pressure with drugs blocking the renin-angiotensin-aldosterone system). Catastrophic antiphospholipid syndrome is an extremely severe complication which can threaten the vital prognosis of the patient. This justifies particular surveillance, as well as prevention in high-risk situations. We also illustrate the difficulties of long-term management in these patients, both in dialysis or kidney transplantation.
    Néphrologie & Thérapeutique 10/2013; · 0.55 Impact Factor
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    ABSTRACT: While much has been learned about the epidemiology and treatment of end-stage renal disease (ESRD) in the last 30 years, chronic kidney disease (CKD) before the end-stage has been less investigated. Not enough is known about factors associated with CKD progression and complications, as well as its transition to ESRD. We designed the CKD-renal epidemiology and information network (REIN) cohort to provide a research platform to address these key questions and to assess clinical practices and costs in patients with moderate or advanced CKD. A total of 46 clinic sites and 4 renal care networks participate in the cohort. A stratified selection of clinic sites yields a sample that represents a diversity of settings, e.g. geographic region, and public versus for-profit and non-for-profit private clinics. In each site, 60-90 patients with CKD are enrolled at a routine clinic visit during a 12-month enrolment phase: 3600 total, including 1800 with Stage 3 and 1800 with Stage 4 CKD. Follow-up will continue for 5 years, including after initiation of renal replacement therapy. Data will be collected from medical records at inclusion and at yearly intervals, as well as from self-administered patient questionnaires and provider-level questionnaires. Patients will also be interviewed at baseline, and at 1, 3 and 5 years. Healthcare costs will also be determined. Blood and urine samples will be collected and stored for future studies on all patients at enrolment and at study end, and at 1 and 3 years in a subsample of 1200. The CKD-REIN cohort will serve to improve our understanding of the biological, clinical and healthcare system determinants associated with CKD progression and adverse outcomes as well as of international variations in collaboration with the CKD Outcome and Practice Pattern Study (CKDopps). It will foster CKD epidemiology and outcomes research and provide evidence to improve the health and quality of life of patients with CKD and the performances of the healthcare system in this field.
    Nephrology Dialysis Transplantation 09/2013; · 3.37 Impact Factor
  • Néphrologie & Thérapeutique 09/2013; 9(5):373. · 0.55 Impact Factor
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    ABSTRACT: BACKGROUND: Reasons underlying dialysis decision-making in Octogenarians and Nonagenarians have not been further explored in prospective studies. METHODS: This regional, multicentre, non-interventional and prospective study was aimed to describe characteristics and quality of life (QoL) of elderly (>=80 years of age) with advanced chronic kidney disease (stage 3b-5 CKD) newly referred to nephrologists. Predictive factors of death and dialysis initiation were also assessed using competing-risk analyses. RESULTS: All 155 included patients had an estimated glomerular filtration rate (eGFR) below 45 ml/min/1.73m2. Most patients had a non anaemic haemoglobin level (Hb) with no iron deficiency, and normal calcium and phosphate levels. They were well-fed and had a normal cognitive function and a good QoL. The 3-year probabilities of death and dialysis initiation reached 27% and 11%, respectively. The leading causes of death were cardiovascular (32%), cachexia (18%), cancer (9%), infection (3%), trauma (3%), dementia (3%), and unknown (32%). The reasons for dialysis initiation were based on uncontrolled biological abnormalities, such as hyperkalemia or acidosis (71%), uncontrolled digestive disorders (35%), uncontrolled pulmonary or peripheral oedema (29%), and uncontrolled malnutrition (12%). No patients with acute congestive heart failure or cancer initiated dialysis. Predictors of death found in both multivariate regression models (Cox and Fine & Gray) included acute congestive heart failure, age, any walking impairment and Hb <10g/dL. Regarding dialysis initiation, eGFR <23mL/min/1.73m2 was the only predictor found in the Cox multivariate regression model whereas eGFR <23mL/min/1.73m2 and diastolic blood pressure were both independently associated with dialysis initiation in the Fine & Gray analysis. Such findings suggested that death and dialysis were independent events. CONCLUSIONS: Octogenarians and Nonagenarians newly referred to nephrologists by general practitioners were highly selected patients, without any symptoms of the common geriatric syndrome. In this population, nephrologists' dialysis decision was based exclusively on uremic criteria.
    BMC Nephrology 05/2013; 14(1):103. · 1.52 Impact Factor
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    ABSTRACT: The aim of this study was to describe the management of anaemia with a continuous erythropoietin receptor activator (C.E.R.A., methoxy polyethylene glycol epoetin-β), in patients with chronic kidney disease (CKD) not on dialysis, naïve or non-naïve to treatment with erythropoiesis-stimulating agents (ESAs) at inclusion. National, multicentre, longitudinal, observational prospective study. 133 nephrologists practicing in France selected patients during their routine follow-up visits. The study was non-interventional. They were adult CKD patients not on dialysis or kidney transplant patients, naïve or not to ESA treatment: 524 patients not on dialysis (48% ESA-naïve) and 92 kidney transplant patients (24% ESA-naïve) were included and followed up every 3 months during 1 year. The two main endpoints were the percentage of patients who achieved target haemoglobin (Hb) levels as per European Medicines Agency guidelines (10-12 g/dl) around 6 months of treatment and modalities of treatment. Approximately one in two patients had an Hb level within 10-12 g/dl at baseline, and around 6 and 12 months of treatment. Ninety per cent of ESA-naïve patients achieved at least +1 g/dl increase over baseline Hb levels or had Hb within 10-12 g/dl around 6 and 12 months. The Hb level remained at approximately 11.5 g/dl during the 12 months of follow-up. Around 6 months: almost all patients were receiving a once-monthly subcutaneous dose of C.E.R.A. (patients not on dialysis: 95±54 µg; kidney transplant patients: 121±70 µg); approximately half the patients did not require a change in C.E.R.A. dose. Adverse effects related to C.E.R.A. were observed in less than 5% of patients and led to modification or discontinuation of treatment in 2%. The efficacy and safety of C.E.R.A. in CKD patients not on dialysis, with or without kidney transplantation, were confirmed in routine clinical practice.
    BMJ Open 03/2013; 3(3). · 2.06 Impact Factor
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    ABSTRACT: The AVENIR study is a pharmaco-epidemiological study, lead in Lorraine region (France) between 1st January, 2005 and 31st December, 2006, which aim at: evaluating the quality of therapeutic practices, delivered by nephrologists, for chronic kidney disease patients during the year preceding dialysis onset, assessing the association between quality of predialysis therapeutic practices and survival and hospitalization during the first year of dialysis, and health-related quality of life at dialysis onset. Several data were collected for the AVENIR study: demographic, clinical, biological and therapeutic data before dialysis, morbidity and mortality during dialysis treatment. These data were used for secondary analyses investigating the decline in glomerular filtration rate over the year preceding dialysis, the management of hypertension and proteinuria before dialysis, and characteristics and outcomes of patients with delayed dialysis initiation. Results from the AVENIR study have been published in various international journals. The aim of this manuscript is to present a summary of these results and the lessons we can learn for the nephrological practice.
    Néphrologie & Thérapeutique 11/2012; · 0.55 Impact Factor
  • Pascal Houillier, Luc Frimat
    Néphrologie & Thérapeutique 10/2012; · 0.55 Impact Factor
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    ABSTRACT: BACKGROUND: In survival analysis, patients on peritoneal dialysis are confronted with three different outcomes: transfer to hemodialysis, renal transplantation, or death. The Kaplan-Meier method takes into account one event only, so whether it adequately considers these different risks is questionable. The more recent competing risks method has been shown to be more appropriate in analyzing such situations METHODS: We compared the estimations obtained by the Kaplan-Meier method and the competing risks method (namely the Kalbfleisch and Prentice approach), in 383 consecutive incident peritoneal dialysis patients. By means of simulations, we then compared the Kaplan-Meier estimations obtained in two virtual centers where patients had exactly the same probability of death. The only difference between these two virtual centers was whether renal transplantation was available or not. RESULTS: At five years, 107 (27.9%) patients had died, 109 (28.4%) had been transferred to hemodialysis, 91 (23.8%) had been transplanted, and 37 (9.7%) were still alive on peritoneal dialysis; before five years, 39 (10.2%) patients were censored alive on peritoneal dialysis. The five-year probabilities estimated by the Kaplan-Meier and the competing risks methods were respectively: death: 50% versus 30%; transfer to hemodialysis: 59% versus 32%; renal transplantation: 39% versus 26%; event-free survival: 12% versus 12%. The sum of the Kaplan-Meier estimations exceeded 100%, implying that patients could experience more than one event, death and transplantation for example, which is impossible. In the simulations, the probability of death estimated by the Kaplan-Meier method increased as the probability of renal transplantation increased, although the probability of death actually remained constant. CONCLUSION: The competing risks method appears more appropriate than the Kaplan-Meier method for estimating the probability of events in peritoneal dialysis in the context of univariable survival analysis.
    BMC Nephrology 05/2012; 13(1):31. · 1.52 Impact Factor

Publication Stats

835 Citations
300.80 Total Impact Points

Institutions

  • 2011–2012
    • Université René Descartes - Paris 5
      Lutetia Parisorum, Île-de-France, France
  • 1996–2011
    • Centre Hospitalier Universitaire de Nancy
      Nancy, Lorraine, France
  • 2010
    • University Hospital Estaing of Clermont-Ferrand
      Clermont, Auvergne, France
  • 2008–2009
    • Université de Rennes 1
      Roazhon, Brittany, France