Etiological features of urinary tract infections in pregnant women: current state of the problem

Abstract

Background. Urinary tract infections in pregnant wo­men occupy a leading place in the structure of extragenital patho­logy. The purpose of the study is to determine the etiological features of urinary tract infections in pregnant women. Materials and ­methods. The study included 89 pregnant women with urinary tract infections. The material for microbiological research was urine, the samples of which were collected on the day of hospitalization of a pregnant woman before treatment. Identification of microorganisms was carried out with the use of ­MIKROLATEST® test systems (Erba Lachema, Czech Republic). Preparation of bacterial suspensions with a certain concentration of microbial cells was carried out using Densi-La-Meter electronic device (PLIVA-Lachema a.s., Czech Republic) according to the McFarland scale. Optical density was measured using a Multiskan EX microplate reader (type 355). Results. Escherichia coli, Proteus mirabilis, Proteus vulgaris, Streptococcus pyogenes, Enterococcus faecalis, Klebsiella pneumoniae, Pseudomonas aeruginosa are the leading pathogens of urinary tract infections in pregnant women of the Kharkiv region; Escherichia coli, Proteus mirabilis, Streptococcus pyogenes are predominant ones. The selected spectrum of etiological factors of urinary tract infections does not depend on the age of a pregnant woman. In the etiological structure of the urinary tract infections in pregnant women, Escherichia coli and Proteus mirabilis take the first and the second place during the first three trimesters of pregnancy. The third place in the first trimester belongs to Enterococcus faecalis, in the second trimester — to Proteus vulgaris and Streptococcus pyogenes, in the third trimester — to Streptococcus pyogenes. The etiological structure of urinary tract infections in pregnant women is determined by the topography of the inflammatory process. Thus, in women with asymptomatic bacteriuria, Proteus mirabilis takes the first place, Escherichia coli — the second place, Proteus vulgaris and Enterococcus faecalis — the third place; in acute pyelonephritis, the first place belongs to Escherichia coli, the second place to Streptococcus pyogenes, the third place to Proteus mirabilis, Enterococcus faecalis, Klebsiella pneumoniae; in urethritis, Escherichia coli takes the first place, Enterococcus faecalis, Klebsiella pneumoniae — the second place, Proteus mirabilis, Proteus vulgaris — the third place; in cystitis, the first place belongs to Escherichia coli, the second place to Proteus mirabilis, Proteus vulgaris, Enterococcus faecalis, Klebsiella pneumoniae, Pseudomonas aeruginosa. Conclusions. The etiological features of urinary tract infections with different topography of the inflammatory process of bacterial etiology determined by the authors must be taken into account in the treatment of this category of pregnant women.