MICROBIOLOGICAL ISOLATES AND IT’S RESISTOTYPE FROM CLINIC OF VASCULAR SURGERY FOR THE FIRST QUATER OF 2022
Authors:   UMHAT St.George, Plovdiv, Clinic of Vascular Surgery, Bulgaria, Chesmedzhieva Bogomila , Stanev Stefan ,   UMHAT St.George, Plovdiv, Clinic of Vascular Surgery, Bulgaria, Dermendzhiev Tihomir ,   Medical University Plovdiv, Department of Microbiology and Immunology, Bulgaria
Published: June 2022

One of the most common complications of surgical exposures is the surgical site infection (SSI). Although it varies between different surgical profiles, it can reach up to one third of all complications. In vascular surgery patients ischemic ulcers are very common, as well as factors, compromising the immune system such as diabetes, chronic kidney disease etc. One of the main surgical exposures in vascular surgery is inguinal, providing access to the femoral artery and its bifurcation. Although it allows a wide range of reconstructions, implanting different types of prosthetic materials, stents and providing anastomosis site, it contains lymph nodes, which can contaminate the reconstruction and cause SSI with severe consequences. Patients, prone to SSI due to concomitant diseases, are threatened by sepsis, limb loss and even death, which makes prevention of those type of complications essential. Aim: To investigate etiological spectrum of microbiological isolates and their resistance against most common antimicrobials among vascular surgery patients. Materials and methods: The study is retrospective, conducted in the period 01 January 2022 – 31 March 2022. All of the samples were obtained from patients of Clinic of Vascular Surgery. After isolation of pure culture from the samples, the strains were identified by MALDI TOF MS and Vitec – 2 Compact. Antibiotic resistance was determined with Bauer-Kirby disk diffusion method. Results: From all 419 of the patients, hospitalized in the Clinic of Vascular surgery for this period, 28 isolates from 26 (6,21%) patients were obtained, of which Gram-negative were 19 (67,86%) and Gram-positive - 9 (32,14%). From Gram-negative - enterobacteria – 14 (73,68%), and non-fermenting gram-negative bacteria (NFGNB) were 5 (26,32%). Only 3 (21,43%) from all enterobacteria were extended spectrum beta-lactamases producing strains (ESBLs). No strains, resistant to carbapenems (RCP) were isolated. Five (55,55%) of the Gram-positive isolates were Staphylococcus aureus, 4 (80%) of which were methicillin resistant Staphylococcus aureus (MRSA). Two of the Gram-positive species isolated were Enterococcus faecalis, of which 1 with a high-level aminoglycoside resistance (HLAR). No Vancomycin resistant enterococci (VRE) were discovered. There were no colistin-resistant Acinetobacter baumannii and Pseudomonas aeruginosa strains. Conclusion: From all 28 isolates 8 (28,57%) were with acquired types of antimicrobial resistance. With almost one third of the isolates that are problematic in terms of antibiotic susceptibility, treatment of those patients can be challenging. Prevention of in hospital contamination with polyresistant strains, associated with medical care it is crucial for reducing the number of severe complications, decreasing of hospital stay and cost for treatment.