1. Outcomes of acute kidney injury depend on initial clinical features: A national French cohort study
- Author
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Olivier Moranne, Alexandre Hertig, Cécile Couchoud, Thierry Hannedouche, Natacha Riffaut, Centre Hospitalier Universitaire de Nîmes (CHU Nîmes), Aide à la Décision pour une Médecine Personnalisé - Laboratoire de Biostatistique, Epidémiologie et Recherche Clinique - EA 2415 (AIDMP), Université Montpellier 1 (UM1)-Université de Montpellier (UM), Urgences néphrologiques et transplantation rénale [CHU Tenon], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Tenon [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Service de néphrologie et hémodialyse [CHU de Strasbourg], CHU Strasbourg, and Agence de la biomédecine [Saint-Denis la Plaine]
- Subjects
Male ,Time Factors ,Databases, Factual ,Epidemiology ,medicine.medical_treatment ,[SDV]Life Sciences [q-bio] ,030232 urology & nephrology ,030204 cardiovascular system & hematology ,urologic and male genital diseases ,0302 clinical medicine ,Cumulative incidence ,Registries ,030212 general & internal medicine ,Incidence (epidemiology) ,Incidence ,Acute kidney injury ,Acute Kidney Injury ,female genital diseases and pregnancy complications ,3. Good health ,Survival Rate ,Hospitalization ,Renal Replacement Therapy ,Nephrology ,Cohort ,Female ,France ,0305 other medical science ,Cohort study ,medicine.medical_specialty ,Subgroup analysis ,Lower risk ,Databases ,03 medical and health sciences ,Internal medicine ,medicine ,Humans ,Rifle ,Renal replacement therapy ,Survival rate ,Dialysis ,Factual ,Aged ,Transplantation ,030505 public health ,business.industry ,Public Health, Environmental and Occupational Health ,medicine.disease ,business ,Follow-Up Studies ,Kidney disease - Abstract
Background Acute kidney injury (AKI) is a common condition that is associated with poor short- and long-term outcomes. The aim of this nationwide cohort study was to profile the long-term outcome of patients admitted for AKI in France. Methods Based on the comprehensive French hospital discharge database, all hospitalizations for an AKI episode were categorized in four groups according to the presence of at least one dialysis session (RRT) and according to the coding of AKI as the principal or associated diagnosis (PRINC_DIAG or ASS_DIAG). The cumulative incidences of death and ESRD in each group were analyzed with a subdistribution hazard (Fine and Gray) model to take into account the competing risks between those two outcomes. A subgroup analysis was done for patients who were alive and not on RRT at hospital discharge. The effect of the initial clinical feature on death or ESRD was analyzed with an adjusted cause-specific Cox proportional hazard regression censored at other outcomes. All the models were adjusted for age, gender and comorbidities. Results In this nationwide cohort of 989,974 patients (median age 77 years) hospitalized with AKI during the 2009–2016 period, 422,739 (43%) patients died (235,572 during the first hospitalization) and 40,015 (4%) patients reached ESRD (5962 during first hospitalization) up to 31 December 2016. Former cardiovascular disease and CKD were diagnosed in 40% and 16% of patients, respectively. Patients without RRT and discharged from hospital had a cumulative incidence of ESRD which ranged from 5.3% [5.2–5.4] in the ASS_DIAG group to 28.7% [27.9–29.5] in the RRT-PRINC_DIAG group at 60 months. The cumulative incidence of death ranged from 31.0% [30.2–32.2] in the RRT-ASS_DIAG group to 45.5% [45.3–45.7] in the ASS_DIAG group. Initial clinical features were associated with outcome independent of comorbidities and age. Compared to RRT-PRINC_DIAG, PRINC_DIAG (HR: 0.4, 95% CI: 0.4–0.4), ASS_DIAG patients (HR: 0.1, 95% CI: 0.1–0.2) and RRT-ASS_DIAG (HR: 0.4, 95% CI: 0.4–0.5) patients were at lower risk of reaching ESRD. Results were similar in each age group and whether or not patients had a previous diagnosis related to urinary tract or kidney disease. RRT-ASS_DIAG patients had a higher risk of death (HR: 1.9, 95% CI: 1.9–2.0) as compared to RRT-PRINC_DIAG, while patients with AKI as principal diagnosis (PRINC_DIAG) or associated diagnosis (ASS_DIAG) not requiring dialysis had a lower risk (HR: 0.7, 95% CI: 0.6–0.7 and HR: 0.9, 95% CI: 0.9–0.9, respectively). Conclusions The major strength of our observational study was the national coverage obtained from the comprehensive French hospital discharge database and a long follow-up over seven years. Our study strengthens the current recommendations for long-term follow-up of patients with AKI. The novelty of this study is to propose a clinical classification of AKI episodes that is easy to detect in administrative medical databases and that is strongly associated with immediate and long-term outcomes. This novel classification is based on the perceived primacy of AKI as a driver of the illness that brought the patient to the hospital and the need of RRT. Further studies are now warranted to compare the performance of our classification to predict long-term outcome to other classifications, including the KDIGO, AKIN or RIFLE.
- Published
- 2018
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