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Year : 2019  |  Volume : 6  |  Issue : 3  |  Page : 273-281

Furosemide stress test, a novel assessment tool for tubular function in critically ill patients with acute kidney injury: potential therapeutic and prognostic values

1 Department of Critical Care Medicine, Beni Suef University, Beni Suef, Egypt
2 Department of Critical Care Medicine, Cairo University, Egypt
3 Department of Critical Care, Nasser Institute Hospital, Cairo, Egypt

Correspondence Address:
MD Hamdy M Saber
Department of Critical Care Medicine, Beni Suef University, Beni Suef
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/roaic.roaic_30_18

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Introduction Acute kidney injury (AKI) is well recognized for its effect on the outcome of patients admitted to ICU. The pursuit of improved biomarkers for the early diagnosis of AKI and its outcomes is an area of intense contemporary research; studies demonstrated the utility of furosemide stress test (FST) for predicting the severity of AKI, and a possibility of administration as a treatment for acute kidney injury network (AKIN) I and II. Patients and methods A total of 80 patients in ICU of Nasser Institute Hospital (July 2014–2015) were recruited, including 40 patients who received FST and 40 patients who received standard management. Patients included were those who developed AKI grades Ι–Π according to AKIN criteria. They were assessed clinically and followed through the duration of the study by hourly central venous pressure measurement (CVP) and urine output for 6 h, besides daily kidney function tests and estimated glomerular filtration rate for 3 days. Results In the first 6 h, there was a significant increase in urine output in group I after first and second hours (P=0.026, 0.008, respectively), as well as cumulative UOP over 6 h (P=0.003), as compared with group II. The cutoff point regarding UOP for detection of progress to AKIN III and dialysis was found to be 325 ml in both groups, with sensitivity of 86.7% and specificity of 68% in group I and sensitivity of 95% and specificity of 95% in group II. There was a highly significant difference between the two groups concerning hypotension, which occurred in 11 patients in group I versus none in group II, with P value of 0.001, whereas there was no significant difference between both the groups concerning progression to AKIN III and dialysis, with P value of 0.260; ICU stay, with P value of 0.621; and mortality, with P value of 0.201. Our results in group I patients who did not show worsening of AKIN class had significantly higher urine output as compared with those whose AKIN class worsened, with P value of 0.001. Conclusion FST is a good predictor of severity of tubular damage in early stages of AKI, with no additional privilege over standard management in the treatment of AKI. Moreover, it carries more risk of hemodynamic compromise.

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