@article{KusanSuratKelmetal.2022,
  author    = {Kusan, Simon and Surat, G{\"u}zin and Kelm, Matthias and Anger, Friedrich and Kim, Mia and Germer, Christoph-Thomas and Schlegel, Nicolas and Flemming, Sven},
  title     = {Microbial spectrum and antibiotic resistance in patients suffering from penetrating Crohn's disease},
  series = {Journal of Clinical Medicine},
  volume    = {11},
  journal   = {Journal of Clinical Medicine},
  number    = {15},
  issn      = {2077-0383},
  doi       = {10.3390/jcm11154343},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-281835},
  year      = {2022},
  abstract  = {Intraabdominal abscess formation occurs in up to 30\% of patients suffering from Crohn's disease (CD). While international guidelines recommend a step-up approach with a combination of empiric antibiotic therapy and percutaneous drainage to delay or even avoid surgery, evidence about microbial spectrum in penetrating ileitis is sparse. We retrospectively assessed outcomes of 46 patients with terminal penetrating Ileitis where microbial diagnostics have been performed and compared microbial spectrum and antibiotic resistance profile of CD patients with patients suffering from diverticulitis with intraabdominal abscess formation. In both groups, the most frequently isolated pathogen was the gram-negative bacterium E. coli belonging to the family of Enterobacterales. However, overall Enterobacterales were significantly more often verifiable in the control group than in CD patients. Furthermore, microbial analysis showed significant differences regarding isolation of anaerobic pathogens with decreased frequency in patients with CD. Subgroup analysis of CD patients to evaluate a potential influence of immunosuppressive therapy on microbial spectrum only revealed that Enterobacterales was less frequently detected in patients treated with steroids. Immunosuppressive therapy did not show any impact on all other groups of pathogens and did not change antibiotic resistance profile of CD patients. In conclusion, we were able to demonstrate that the microbial spectrum of CD patients does differ only for some pathogen species without increased rate of antibiotic resistance. However, the empiric antibiotic therapy for CD-associated intra-abdominal abscess remains challenging since different points such as local epidemiological and microbiological data, individual patient risk factors, severity of infection, and therapy algorithm including non-surgical and surgical therapy options should be considered before therapeutical decisions are made.},
  language  = {en}
}
@article{FlemmingHankirKusanetal.2021,
  author    = {Flemming, Sven and Hankir, Mohammed K. and Kusan, Simon and Krone, Manuel and Anger, Friedrich and Germer, Christoph-Thomas and Wiegering, Armin},
  title     = {Safety of elective abdominal and vascular surgery during the COVID-19 pandemic: a retrospective single-center study},
  series = {European Journal of Medical Research},
  volume    = {26},
  journal   = {European Journal of Medical Research},
  doi       = {10.1186/s40001-021-00583-x},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-264975},
  year      = {2021},
  abstract  = {Background Patients with coronavirus disease 2019 (COVID-19) who undergo surgery have impaired postoperative outcomes and increased mortality. Consequently, elective and semi-urgent operations on the increasing number of patients severely affected by COVID-19 have been indefinitely postponed.in many countries with unclear implications on disease progression and overall survival. The purpose of this study was to evaluate whether the establishment of a standardized screening program for acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is sufficient to ensure high-quality medical and surgical treatment of COVID-19 and non-COVID-19 patients while minimizing in-hospital SARS-CoV-2 transmission. Methods The screening program comprised polymerase chain reaction (PCR) testing of nasopharyngeal swabs and a standardized questionnaire about potential symptoms for SARS-CoV-2 infection. All elective and emergency patients admitted to the surgical department of a tertiary-care hospital center in Lower Franconia, Germany, between March and May 2020 were included and their characteristics were recorded. Results Out of the study population (n = 657), 509 patients (77.5\%) had at least one risk factor for a potentially severe course of COVID-19 and 164 patients (25\%) were active smokers. The average 7-day incidence in Lower Franconia was 24.0/100,000 during the observation period. Preoperative PCR testing revealed four asymptomatic positive patients out of the 657 tested patients. No postoperative SARS-CoV-2 infection or transmission could be detected. Conclusion The implementation of a standardized preoperative screening program to both COVID-19 and non-COVID-19 patients can ensure high-quality surgical care while minimizing infection risk for healthcare workers and potential in-hospital transmission.},
  language  = {en}
}
@article{KelmKusanSuratetal.2022,
  author    = {Kelm, Matthias and Kusan, Simon and Surat, G{\"u}zin and Anger, Friedrich and Reibetanz, Joachim and Germer, Christoph-Thomas and Schlegel, Nicolas and Flemming, Sven},
  title     = {Disease- and medication-specific differences of the microbial spectrum in perianal fistulizing Crohn's Disease — relevant aspects for antibiotic therapy},
  series = {Biomedicines},
  volume    = {10},
  journal   = {Biomedicines},
  number    = {11},
  issn      = {2227-9059},
  doi       = {10.3390/biomedicines10112682},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-290281},
  year      = {2022},
  abstract  = {Perianal fistulizing Crohn's Disease (CD) with abscess formation represents an aggressive phenotype in Inflammatory Bowel Disease (IBD) with increased morbidity. Treatment is multidisciplinary and includes antibiotics, but knowledge about the microbial spectrum is rare often resulting in inadequate antimicrobial therapy. In this single center retrospective study, all patients who were operated due to perianal abscess formation were retrospectively analyzed and the microbial spectrum evaluated. Patients were divided into a CD and non-CD group with further subgroup analysis. 138 patients were finally included in the analysis with 62 patients suffering from CD. Relevant differences were detected for the microbial spectrum with anaerobic bacteria being significantly more often isolated from non-CD patients. In a subgroup-analysis of CD patients only, medical therapy had a relevant effect on the microbial spectrum since Streptococcus groups and Enterobacterales were significantly more often isolated in patients treated with steroids compared to those being treated by antibodies. In conclusion, the microbial spectrum of patients suffering from CD varies significantly from non-CD patients and immunosuppressive medication has a relevant effect on isolated pathogens. Based on that, adaption of antibiotic treatment might be discussed in the future.},
  language  = {en}
}
@phdthesis{Kusan2024,
  author    = {Kusan, Simon Ferdinand},
  title     = {Keimspektrum und antibiotische Therapie bei Morbus Crohn-assoziierten Abszessen : Eine retrospektive monozentrische Analyse},
  doi       = {10.25972/OPUS-35946},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-359467},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2024},
  abstract  = {In dieser monozentrischen retrospektiven Analyse wurde das Keimspektrum und die antibiotische Therapie bei Morbus Crohn- assoziierten Abszessen untersucht.},
  subject      = {Antibiotikum},
  language  = {de}
}