Furosemide stress test as a predictive marker of acute kidney injury progression or renal replacement therapy: a systemic review and meta-analysis
Abstract Background The use of the furosemide stress test (FST) as an acute kidney injury (AKI) severity marker has been discussed in several different trials. However, the diagnostic performance of the FST in predicting AKI progression has not yet been fully discussed. Methods In accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we searched the PubMed, Embase, MEDLINE and Cochrane databases up to December, 31 2019. The diagnostic performance of the FST (in terms of sensitivity, specificity, number of events, number of true positives, and number of false positives) was extracted and evaluated. Results We identified nine trials that enrolled a total of 1296 patients, including 432 patients and 864 patients for whom the outcomes in terms of AKI stage progression and renal replacement therapy (RRT), respectively, were reported. The pooled sensitivity and specificity results of the FST for AKI progression prediction were 0.83 (95% CI: 0.76 - 0.89) and 0.87 (95% CI: 0.80 - 0.92), respectively. The pooled positive likelihood ratio (LR) was 5.27 (95% CI: 3.75-7.39), the pooled negative LR was 0.22 (95% CI: 0.15 - 0.32), and the pooled diagnostic odds ratio (DOR) was 29.34 (95% CI: 16.35-52.66). The summary receiver operating characteristics (SROC) with pooled diagnostic accuracy was 0.87. The diagnostic performance of the FST in predicting AKI progression was not affected by different AKI criteria (relative DOR: 1.04, 95% CI: 0.18 - 5.94) or underlying chronic kidney disease (relative DOR: 0.66, 95% CI: 0.08 - 5.70). The pooled sensitivity and specificity results of the FST for RRT prediction were 0.87 (95% CI: 0.76 - 0.93) and 0.71(95% CI: 0.56 -0.83), respectively. The pooled positive LR and pooled negative LR were 2.85 (95% CI: 1.81-4.48) and 0.22(95% CI: 0.11- 0.43), respectively. The pooled diagnostic odds ratio (DOR) was 13.36 (95% CI: 4.79-37.27) and SROC with pooled diagnostic accuracy was 0.87. Conclusion The FST is a simple tool for the identification of AKI populations at high risk of AKI progression, but the diagnostic performance of FST in RRT prediction is suboptimal.