ObjectiveTwo recent important lupus nephritis trials reported that proteinuria was a good predictor of renal outcome in Caucasians, but data on real-life situation, other races and severe nephritis are lacking to substantiate this finding as a simple test to guide clinical practice. The aim of this study was to validate proteinuria as a predictor of long-term renal outcome in real-life situation in a racially diverse group of patients with severe nephritis.MethodsProteinuria, serum creatinine (SCr) and urine red blood cells were assessed at baseline and after 3, 6 and 12 months, as early predictors of long-term renal outcome (SCr <1.5 mg/dL at 7 years), in 94 patients with biopsy-proven lupus nephritis. The parameter performance and cut-off values were computed by receiver operating characteristic curves. Kaplan-Meier curves were used to validate the parameter.ResultsA proteinuria <0.8 g/24 hours at 12 months was the best single predictor of long-term renal outcome (sensitivity 90%, specificity 78%, positive predictive value 67%, negative predictive value (NPV) 94% and area under the curve 0.86; p<0.001). Addition of other variables to proteinuria such as SCr and haematuria at 12 months did not improve its performance. The proteinuria cut-off value of 0.8 g/24 hours at 12 months was a good predictor of 7-year renal survival (years free of dialysis) for patients with pure membranous (p=0.005) and proliferative nephritis (p=0.043), as well as black (p=0.002) and white race (p=0.001), anti-dsDNA positive (p=0.001) and anti-dsDNA negative (p=0.04) and male (p=0.028) and female (p=0.003) patients.ConclusionWe provided novel evidence that, in a real-life situation, proteinuria at 12 months of follow-up was the single best predictor of renal outcome at 7 years for an ethnically diverse group of patients with severe nephritis and a valid parameter for distinct histological classes, races, genders and anti-dsDNA profiles. The remarkably high NPV obtained reinforces its recommendation as the ideal predictor for clinical practice, since it is of low cost, easy to interpret, non-invasive and widely available.
Objective. Coronavirus disease 2019 (COVID-19) has progressed rapidly around the world, reaching a lethality of up to 20% due to acute respiratory distress syndrome (ARDS). This latter condition is a relevant concern for systemic lupus erythematosus (SLE); however, data on this topic are limited to few case series. Our objective was to evaluate in hospitalized patients with SLE and with COVID-19-associated ARDS (confirmed by reverse transcription-polymerase chain reaction) the risk of mortality and combined poor outcomes (death, intensive care unit [ICU] admission, and/or mechanical ventilation [MV] use) and to compare with that of patients without SLE.Methods. This is a nationwide cross-sectional study of patients with severe acute respiratory syndrome coronavirus 2 nested in the national Influenza Epidemiological Surveillance Information System (Sistema de Informação de Vigilância Epidemiológica da Gripe [SIVEP-gripe]). Mortality rates, frequencies of ICU admissions, and MV use for 319 patients with SLE and 251 800 patients without SLE were calculated as well as relative risks (RRs). A fully adjusted multiple logistic regression was performed to adjust factors, such as age and well-known comorbidities, that might impact worse outcomes.Results. Patients with SLE had an increased risk of death and combined poor outcome compared with patients without SLE (
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