Duration of oliguria and anuria as predictors of chronic renal-related sequelae in post-diarrheal hemolytic uremic syndrome

Prior long-term retrospective studies have described renal sequelae in 25-50% of postdiarrheal hemolytic uremic syndrome (HUS) survivors, but the ability to predict the likelihood of chronic renal- related sequelae at the time of hospital discharge is limited. We surveyed 357 children in our HUS registry who survived an acute episode of post diarrheal HUS (D+HUS) and were without end- stage renal disease (ESRD) at the time of hospital discharge. Of the 357 patients surveyed, 159 had at least 1 year (mean 8.75 years) of follow- up. Of these, 90 individuals were identified as having had at least 1 day of oliguria, with 69 individuals having had at least 1 day of anuria. The incidences of renal- related sequelae [proteinuria, low glomerular filtration rate (GFR), and hypertension] were determined among experimental groups based on oliguria and anuria duration. One or more sequelae (e. g. proteinuria, low GFR, hypertension) was seen in 25 (36.2%) of those who had no recorded oliguria and 34 (37.8%) of those with no recorded anuria. The prevalence of chronic sequelae increased markedly in those with more than 5 days of anuria or 10 days of oliguria, with anuria being a better predictor than oliguria of most related sequelae. A particularly high incidence of hypertension was seen in patients with > 10 days of anuria (55.6%) in comparison with those with no anuria (8.9%) [odds ratio (OR) 12.8; 95% confidence interval (CI) 2.9-57.5]. Patients with > 10 days of anuria were also at substantially increased risk for low GFR and proteinuria (OR 35.2; 95% CI 5.1-240.5). These findings may help identify children who need periodic and extended follow-up after hospital discharge.