Introduction: Urinary tract infections (UTI) are caused in 95% of cases by bacteria--E. coli. UTIs usually are limited to the lower urinary tract, but it may also evolve into pyelonephritis and acute kidney injury.
Objectives: The aim of this study was the laboratory evaluation of renal function in an experimental model of ascending pyelonephritis caused by intravesical infusion of E. coli.
Material & Methods: In female Wistar rats UTI was induced by intravesical administration of E. coli suspension in a dose 10(5) c.f.u./ml (Group 1), and 10(7) c.f.u./ml (Group 2). On the 0,7th, 14th and 21st day of the experiment the animals underwent the procedures of collecting blood and urine samples.
Results: The results shown that in group 2 on the 7th and 14th day of the study the creatinine clearance decreased by 36%, and on 21th by 34%. The increase in serum uric acid concentration (micromol/l) in group 2 was observed on the 7th (229.75 +/- 79.05) and 21st day (98.5 +/- 11.33) with respect to day 0 (77.12 +/- 11.63). In group 2 on the 7th day of the experiment there was observed the increased levels of potassium (mmol/l) in serum (13.5 +/- 1.48) with respect to day 0 (7.74 +/- 0.88). In group 2 in the 7th (1.06 +/- 0.18) and 14th day (1.32 +/- 0.26) there was noted the decreased excretion of potassium in the urine (mmol/24h) with respect to day 0 (3.75 +/- 1.9). The decrease in serum sodium levels (mmol/l) in group 2 was recorded on 14th day (121.5 +/- 8.7) with respect to day 0 (131.62 +/- 4.07). Increased factional sodium excretion--FENa (%) was observed in group 2 on 14th day (0.25 +/- 0.06) with respect to day 0 (0.12 +/- 0.06).
Conclusions: Our main finding is that--independently of the amount bacteria present in urinary bladder--in this inflammatory model there occurs inevitably acute kidney injury, however higher bacteria amount depicts a very clear profile of laboratory parameters that point at the kidney impaired function.
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