The additional criterion for the diagnosis of purulent-destructive forms of acute pyelonephritis

Aim: to develop an additional criterion for objective diagnosis of purulent-destructive forms of acute pyelonephritis. Materials and methods. A total of 35 blood samples from patients with acute pyelonephritis aged from 19 to 85 years (mean age was 52 years) were studied. For the analysis, a classical bacteriological method of isolating blood culture and a modern molecular genetic method of fluorescent in situ hybridization (FISH) using DNA probes complementary to species-specific regions of the 16S rRNA gene of microorganisms were used. The obtained results were processed using the Statistica 6.0 program. Results. The bacteriological study showed that only in one patient (2.9%) a blood culture was positive, whereas with FISH, polymicrobial infection consisting of two associates was observed in five patients (14.3%), and 207 specific luminescence from different DNA probes were detected in blood samples. The associations of members of the Enterobacteriaceae with S. aureus were 2.4 times more frequent than associations of the Enterobacteriaceae with S. epidermidis, indicating a development of the polymicrobial infection and, accordingly, the development of purulent stage of acute pyelonephritis. Conclusion. For the diagnosis of acute pyelonephritis, we suggest to use an additional criterion, which consists in applying of FISH method for the detection and simultaneous identification ofbacteria that were adhered on the surface of erythrocytes and located intracellularly. This method may allow for the differential diagnosis of serous and purulent stages of acute pyelonephritis.

FISH, acute pyelonephritis, diagnostics, FISH, Mood culture, adhesion of microorganisms