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Article Adverse Drug Reactions in Patients with CKD Sole`ne M. Laville ,1 Vale´rie Gras-Champel,2 Julien Moragny,2 Marie Metzger,1 Christian Jacquelinet,1,3 Christian Combe ,4,5 Denis Fouque ,6 Maurice Laville,6 Luc Frimat,7,8 Bruce M. Robinson,9 Be´ne´dicte Stengel,1 Ziad A. Massy,1,10 and Sophie Liabeuf ,2,11 on behalf of the Chronic Kidney Disease-Renal Epidemiology and Information Network (CKD-REIN) Study Group* Abstract Background and objectives Little is known about the burden of adverse drug reactions in CKD. We estimated the incidence of overall and serious adverse drug reactions and assessed the probability of causation, preventability, Due to the number of contributing authors, and factors associated with adverse drug reactions in patients seen by nephrologists. the affiliations are listed at the end of Design, setting, participants, & measurements The Chronic Kidney Disease-Renal Epidemiology and Information this article. Network cohort included 3033 outpatients (65% men) with CKD and eGFR,60 ml/min per 1.73 m2,withfollow- up for 2 years. Adverse drug reactions were identified from hospitalization reports, medical records, and Correspondence: participant interviews and finally assessed for causality, preventability, and immediate therapeutic management Dr. Be´ne´dicte Stengel, E´quipe E´pide´miologie by experts in pharmacology. Clinique, Centre for Epidemiology and Results Median (interquartile range) age was 69 (60–76) years old; 55% had eGFR$30 ml/min per 1.73 m2, and 45% Population Health had eGFR,30 ml/min per 1.73 m2. Participants were prescribed a median (range) of eight (five to ten) drugs. Over (CESP) — Inserm U1018, 16 Avenue 2 years, 536 patients had 751 adverse drug reactions, 150 (in 125 participants) classified as serious, for rates of fi fi P. Vaillant Couturier, 14.4 (95% con dence interval, 12.6 to 16.5) and 2.7 (95% con dence interval, 1.7 to 4.3) per 100 person-years, Villejuif Cedex, respectively. Among the serious adverse drug reactions, 32% were considered preventable or potentially France. Email: preventable; 16 caused death, directly or indirectly. Renin-angiotensin system inhibitors (15%), antithrombotic benedicte.stengel@ agents (14%), and diuretics (10%) were the drugs to which the most adverse drug reactions were imputed, but inserm.fr antithrombotic agents caused 34% of serious adverse drug reactions. The drug was discontinued in 71% of cases, at least temporarily. Adjusted hazard ratios for serious adverse drug reaction were significantly higher in patients with eGFR,30 versus $30 ml/min per 1.73 m2 (1.8; 95% confidence interval, 1.3 to 2.6), in those prescribed more than tenversusless than fivemedications(2.4;95%confidence interval,1.1 to 5.2),orinthosewithpoor versus good adherence (1.6; 95% confidence interval, 1.4 to 2.4). Conclusions Adverse drug reactions are common and sometimes serious in patients with CKD. Many serious adverse drug reactions may be preventable. Some specific pharmacologic classes, particularly antithrombotic agents, are at risk of serious adverse drug reactions. Clinical Trial registry name and registration number Chronic Kidney Disease-Renal Epidemiology and In- formation Network (CKD-REIN), NCT03381950 CJASN 15: 1090–1102, 2020. doi: https://doi.org/10.2215/CJN.01030120 Introduction few have examined ADRs in outpatient settings (4). Despite the highly regulated process of drug market- Although clinicians recognize ADRs as a major prob- ing authorization, no medicine is completely safe. lem in patients with CKD, few studies have investi- Adverse drug reactions (ADRs) are relatively com- gated the incidence of and factors associated with mon; they cause 2%–7% of overall hospitalizations ADRs in this population. (1–4). Two French studies (2,5) have reported that Drug-related nephrotoxicity is frequent and well 3.2%–3.6% of hospital admissions are related to ADRs. documented (15). However, the kidney also plays an The concept of ADR has evolved over time, and today, important role in the clearance of many drugs and it includes any harmful and unwanted reaction to a toxic metabolites that can cause ADR due to their drug occurring at doses normally used in humans or accumulation as kidney function declines. Despite resulting from drug misuse or error or from accidental impaired pharmacokinetics and pharmacodynamics or willful overdose (6). Most available studies have (16–18), patients with CKD use multiple medicines focused on ADR-related hospitalizations (with the and are often exposed to some that are inappropri- ADR the cause of admission [2,3,5,7–10], occurring ately prescribed (19). Until now, studies in patients during hospitalization [11,12], or both [1,13,14]); very with CKD have been on the basis of self-reported 1090 Copyright © 2020 by the American Society of Nephrology www.cjasn.org Vol 15 August, 2020 CJASN 15: 1090–1102, August, 2020 Adverse Drug Reactions in CKD, Laville et al. 1091 ADRs (20), have concerned specific drugs during clinical insurance, but none of these differences affect the recording trials (21,22), or have been restricted to ADRs during and processing of prescriptions. Accordingly, drug pre- hospitalization (23) or to specific types of ADRs (24). None scriptions were continuously recorded from 3 months of the studies reported therapeutic management after the preceding inclusion through the end of follow-up. We ADR. No comprehensive evaluation exists of the in- used the international Anatomic Therapeutic and Chemical cidence, probability of causation, and preventability of thesaurus (28) to code treatments and recorded their start ADRs in both inpatients and outpatients belonging to and discontinuation dates (with causes, if any). Kidney this population. failure events, defined as dialysis start or preemptive The primary objective of this study was to estimate the transplantation, and deaths were reported by the partici- incidence rates of overall and serious ADRs according to pants or their families, or they were identified from medical eGFR in patients with moderate or advanced CKD treated records or record linkage with the national kidney fail- by a nephrologist. Secondary objectives aimed at assessing ure registry (29). their causation, preventability, associated factors, and immediate therapeutic management. Identification and Validation of Adverse Drug Reactions An ADR is defined as “an appreciably harmful or Materials and Methods unpleasant reaction, resulting from an intervention related Study Design and Participants to the use of a medicinal product, which predicts hazard fi The Chronic Kidney Disease-Renal Epidemiology and from future administration and warrants prevention or speci c Information Network (CKD-REIN) is a prospective cohort treatment, or alteration of the dosage regimen, or withdrawal ” study conducted in 40 nationally representative nephrol- of the product (6). An ADR is considered serious when the ogy outpatient facilities in France. Eligible patients were at patient outcome is death (or a life-threatening situation), least 18 years of age, had a confirmed diagnosis of hospitalization (initial or prolonged), disability or permanent moderate or advanced CKD, had an eGFR,60 ml/min damage, or another important medical event (30). per 1.73 m2, were not on dialysis, and had not been We collected ADRs over a 2-year follow-up via an fi transplanted. From July 2013 to March 2016, CKD-REIN electronic form designed speci cally to include information included 3033 patients. Details of the study protocol and critical for this study. We used several sources to identify flow chart have been published elsewhere (25). The in- ADRs: (1) medical records (examined by CRAs), (2) stitutional review board of the French National Institute of participant interviews by CRAs, and (3) hospital reports fi Health and Medical Research (reference: IRB00003888) (Figure 1). Hospitalizations were identi ed from (1)elec- approved the protocol, and the study was registered at tronic medical records, (2) nephrology records, and (3) ClinicalTrials.gov (NCT03381950). participant interviews. For each hospitalization, we ob- tained a report to confirm the period and the cause. Causes of hospitalization were coded by a physician according to Information the tenth revision of the International Classification of Data were collected at baseline and then annually by Diseases. Every drug prescribed to the patient at the time of trained clinical research associates (CRAs) from participant each ADR was recorded. Each identified ADR was re- interviews and medical records from the nephrology viewed by two pharmacists (S.L. and S.M.L.) who evalu- centers that included them. All of them contain patient ated the potential causation of reported drug-related ADRs histories, hospitalizations reports, imaging, and laboratory and coded the types of effect according to the medical data from every ward of the hospital/clinic, but they are dictionary for regulatory activities (MedDRA Dictionary), not standardized and may differ between these centers. the severity of the ADR (nonserious or serious), the drug Data collected included sociodemographic characteristics suspected of responsibility for the ADR, its dosage, and and a history of hypertension, diabetes, cardiovascular immediate medication management: discontinuation of the disease, dyslipidemia, or AKI, as defined previously (25). product, dose adaptation, or no change. If the ADR was Medication adherence was assessed with the Girerd score considered serious, a larger committee of expert pharma- (26), which was calculated by asking