Prevalence of renal abnormalities in chronic HBV infection: the HARPE study.

BACKGROUND & AIMS: Few data are available on the prevalence of renal abnormalities in chronic hepatitis B virus (HBV)-infected patients. The multicentric cross-sectional HARPE study evaluated the prevalence of kidney disease indicators, in chronic HBV surface antigen carriers patients (HBsAg+) with active or inactive infection. PATIENTS AND METHODS: Two hundred and sixty-eight HBsAg+ adult patients, naïve of any oral antihepatitis B virus treatment were prospectively included over 2 years. Data for renal assessment were collected once from patient files. Univariate tests and multiple linear regressions were performed with the SAS software, version 8.02 (SAS, Inc., Cary, NC, USA). RESULTS: Among the 260 patients analysed, 58% were men, the mean age was 42 ± 14 years, 59.6% were inactive carriers whereas 47 patients, mostly active, were about to start an antiviral therapy. Prevalence of proteinuria, haematuria, glycosuria, uninfectious leukocyturia was 38.1%, 20.6%, 3.9% and 9% respectively. According to the international definition, a total of 64.6% of patients were found to have kidney disease. Diabetes, hypertension and dyslipidaemia were observed, respectively, in 4.6%, 9.2% and 38.8% patients. There were no significant differences in these results within the three subgroups. CONCLUSION: Renal abnormalities are highly prevalent in our population and pre-exist before the initiation of any antihepatitis B virus treatment. This emphasizes the need for: (i) a baseline renal evaluation in all HBs antigen-positive patients; (ii) a regular renal monitoring before and during antihepatitis B virus treatment to diagnose and manage renal impairment and adjust antihepatitis B virus treatment doses to renal function when necessary.

Acute renal failure associated with the new BRAF inhibitor vemurafenib: a case series of 8 patients.

BACKGROUND: Vemurafenib is a BRAF inhibitor that has become the cornerstone of metastatic or inoperable melanoma therapy since its approval in 2011 in the United States and 2012 in Europe. This targeted therapy has shown impressive results in terms of increased progression-free and overall survival as compared to dacarbazine. The safety profile did not include any renal manifestations at that time. METHODS: This report is the first case series of 8 patients who experienced significant to severe renal insufficiency under vemurafenib treatment. RESULTS: This case series shows that vemurafenib may induce potentially severe acute renal failure, including renal sequelae and persistent kidney disease in some cases. CONCLUSIONS: Further studies are needed to investigate the effects of vemurafenib on the kidneys. Meanwhile, renal function should be closely monitored in treated patients for early detection of any renal dysfunction occurrence. Cancer 2014;120:2158-2163. © 2014 American Cancer Society.

Administration of intravenous iron complexes on implantable central venous access port in cancer patients in France: the FERPAC survey.

PURPOSE: Implantable central venous access port (portacath) is used to provide long-term venous access and to deliver chemotherapy in cancer patients. Intravenous iron complexes are frequently prescribed in this setting, and some physicians use a portacath for their administration. The aim of this survey was to assess the frequency of this practice and the reasons supporting it. METHODS: This declarative survey was conducted in France; 497 oncologists/hematologists were contacted to answer a survey on their practices regarding the administration of intravenous iron via a portacath. RESULTS: A total of 141 recipients (29.5 %) completed the questionnaire. The intravenous iron complexes most frequently used were iron sucrose and ferric carboxymaltose, and 55.2 % of the responders reported using a portacath to administer intravenous iron complexes. The main reasons mentioned for this practice were ease of administration (27.9 %) and preservation of venous capital (27.6 %). The main reasons reported for not using a portacath to administer intravenous iron were a history of thrombosis (45.1 %) or potential drug interactions (17.7 %). Efficacy and safety were expected to be similar to those observed with peripheral administration. A 47.6 % of physicians declared that they usually did not observe adverse reactions after use of a portacath for iron administration. Intravenous iron administration was always planned after chemotherapy for 46.6 % of the responders and before chemotherapy for 38.2 %, whereas 15.3 % did not have any preference for either option. CONCLUSIONS: Intravenous iron complexes (mainly iron sucrose and ferric carboxymaltose) are commonly administered through a portacath in cancer patients in France. The choice for this route of administration is supported by clinical considerations, but further studies are needed to confirm the efficacy and safety of this practice.

Cross-sectional study to describe allergic rhinitis flare-ups and associated airways phenotype in house dust mite sensitization.

OBJECTIVES: To quantify and describe flare-ups of house dust mite allergic rhinitis (HDM-AR) which had occurred during the last 12 months in a population of adults and children candidate for Allergen ImmunoTherapy (AIT). Next, to identify associated clinical features. MATERIALS AND METHODS: This was an observational, multicenter, cross-sectional study that included patients aged ≥ 5 years with HDM-AR eligible for AIT and without prior AIT for at least 12 months. Flare-ups were all period with impairment of quality of life (QoL) and requiring a change in their usual treatment. Data were collected using medical records and patient questionnaires. Variables associated with the occurrence of ≥ 2 AR flare-ups were identified. RESULTS: 1,701 patients were included (average age: 23 years, 51.5% males, 30.4% children, 17.7% adolescents and 51.9% adults). Severe and persistent AR affected 70.9% of them and 53.7% showed polysensitization. Asthma was associated with AR in 34.4% and was well-controlled in 58.5%. The occurrence of at least one AR flare-up in the year was reported by 77.7%, with an annual rate in the whole population of 2.6 ± 3.9 and a duration of 14.1 ± 17.1 days. Deeply or moderately AR-related degraded QoL was experienced by 39.5% and 64.6%, respectively. The occurrence of ≥ 2 AR flare-ups was reported by 54.5% and was associated with polysensitization, AR intermittence and severity. CONCLUSION: AR flare-ups are frequent and impair QoL in HDM-allergic patients, suggesting that it could be considered as therapeutic targets.

[How to adjust the dose of drugs in chronic kidney disease?]. / Comment adapter la dose des médicaments dans la maladie rénale chronique?

Renal insufficiency is a common disease, in the general population as well as in some specific diseases such as HIV infection or cancer. The vast majority of medicines require a dosage adjustment in case of renal dysfunction, it is thus of a crucial importance to know how to evaluate appropriately renal function, on one hand, but also to have access to reliable information sources on how to handle the drugs in such cases. Most often, the Summary of Drug Characteristics (SmPC) only provides partial information, which may even be false in some cases as compared to the most recent data from the literature. However, some information sources exist, reliable, updated, and easily accessible.

[Nephrotoxicity of antiretrovirals other than tenofovir]. / Néphrotoxicité des antirétroviraux autres que le ténofovir.

The remarkable improvement of the outcome of HIV infection came with the price of substantial toxicity of some antiretrovirals. The first molecules used to treat HIV included an important nephrotoxicity. Zalcitabine, stavudine and didanosine can induce severe lactic acidosis. Lactate production is enhanced and the renal capacity to regulate pH is overwhelmed. However, this side effect is not due to a direct dysfunction of the kidneys. Zalcitabine was withdrawn from the market because of this risk. Indinavir, a protease inhibitor, is soluble only in very acidic solutions. Consequently, the small fraction that is excreted in the urine precipitates and can be responsible for uro-nephrolithiasis, leukocyturia, cristalluria, obstructive acute kidney failure, and acute or chronic interstitial nephritis. This is the reason why indinavir is almost not prescribed nowadays, even if it is still marketed. In addition to the direct nephrotoxicity of some antiretrovirals, anti-HIV treatment also includes a toxicity which pathophysiology is not completely elucidated. This nephrotoxicity is the consequence of organ accelerated ageing and of an increased vascular risk. Kidney vascularization (from renal arteries to capillaries) is essential to kidney function and all cardiovascular risks are also renal risks. It is now clearly established that combined antiretroviral treatment increases the vascular risk. A better comprehension of the links between HIV infection, its treatment and very long-term kidney risk is needed to improve the complex management of patients who have now cumulated several decades of HIV infection and treatment with various toxicities.

Incidence of nephrogenic systemic fibrosis in patients undergoing dialysis after contrast-enhanced magnetic resonance imaging with gadolinium-based contrast agents: the Prospective Fibrose Nephrogénique Systémique study.

BACKGROUND: Nephrogenic systemic fibrosis (NSF) has been related to the use of gadolinium-based contrast agents (GBCAs) in patients undergoing dialysis. The Prospective Fibrose Nephrogénique Systémique study, a French prospective study supported by the French drug regulatory agency (Agence Nationale de Sécurité du Médicament) and the French Societies of Nephrology, Dermatology, and Radiology, aimed at determining the incidence of NSF in patients undergoing long-term dialysis. MATERIALS AND METHODS: Adult patients undergoing long-term dialysis receiving a magnetic resonance imaging (MRI) examination prescribed between January 15, 2009 and May 31, 2011, with or without GBCA were included. The methodology was based on a patient form intended to detect any dermatological event (DE) that may occur within 4 months after the examination. Further investigations were planned with their physicians if a DE was reported. RESULTS: A total of 571 patients were included. A total of 50.3% received GBCA. Among them, 93.4% received a macrocyclic GBCA, usually gadoteric acid (88.9%). All in all, 22 patients (3.9%) reported a DE. Dermatological diagnoses did not reveal any evidence of NSF. CONCLUSIONS: The incidence of NSF after a single dose of a macrocyclic GBCA is null in our sample of 268 patients undergoing dialysis (hemodialysis and peritoneal dialysis). This incidence is just lower than 0.5%. When contrast-enhanced MRI can be essential, or even decisive, to the diagnosis, these results are important and reassuring if physicians need to perform contrast-enhanced MRI in patients undergoing dialysis.

Malaria prophylaxis in patients with renal impairment: a review.

Malaria is an endemic and potentially lethal disease transmitted by the protozoan parasite Plasmodium. It is currently endemic in more than 100 countries, which are visited by 125 million international travellers every year. For dialysis and renal insufficiency patients it becomes increasingly easier to travel to these countries thanks to the recent advances in renal replacement therapy. However, the pharmacokinetics of some prophylactic agents in malaria are altered, which may modify the effectiveness and safety of such treatments and the way they should be prescribed. Clinicians should be aware of these alterations which require subsequent dosage adjustments. This review provides recommendations on the use of antimalarial drugs, alone or in combination, in patients with renal impairment. These recommendations depend on the prevalence of Plasmodium falciparum chloroquine resistance, as defined by the WHO. Furthermore, fixed-dose combinations cannot be used in patients with creatinine clearance below 60 mL/min since the tablets available do not allow appropriate dosage adjustment for each drug. Chloroquine and proguanil require dosage adjustments, while atovaquone, doxycycline and mefloquine do not.

Pulmonary hypertension: use of oral drugs in patients with renal insufficiency.

Pulmonary hypertension (PH) is a progressive, fatal pulmonary circulatory disease that is characterized by elevated pulmonary arterial pressure and secondary right ventricular failure. PH has been reported to be highly prevalent in patients with chronic kidney disease, and especially among end-stage renal disease patients undergoing haemodialysis. However, only few data are available on drug dosage adjustment to renal function for those drugs that are commonly used in the treatment of PH. We reviewed the literature and gathered information, although sparse, to propose guidelines for using these drugs in renal insufficiency patients.

[Renal toxicity of contrast agents in oncologic patients]. / Toxicité rénale des produits de contraste chez le patient oncologique.

Cancer patients frequently undergo imaging examinations to diagnosis but also to evaluate their responses to treatment. These patients are also at high risk of kidney impairment before considering the possible nephrotoxicity of their chemotherapy. In this context, it is overriding to know contrast agents induced risks and what are the good practices to avoid them. Renal function evaluation takes a major part in there. The X-ray radiology using iodinated contrast agent (ICA) exposes patients to acute renal failure. This induced nephropathy is prevented by adequate hydration prior to injection when the glomerular filtration rate (GFR) of the patient is less than 60 ml/min/1.73 m(2). For hardly nephrotoxic, gadolinium-based contrast agents (GBCA) injected in magnetic resonance imaging, were considered for a long as a safe alternative to ICA. Yet they may induce nephrogenic systemic fibrosis (NSF). The recommendations of European and U.S. drugs safety agencies have recently converged defining groups at risk of NSF based on the level of patients GFR and the type of GBCA used. How to assess the risk-benefit balance of the cancer patient for whom you should choose an informative, effective and safe imaging examination?