Intra-abdominal Infection Patients Research Articles

Causative Microorganisms Isolated from Patients with Intra-Abdominal Infections and Their Drug Resistance Profiles: An 11-Year (2011–2021) Single-Center Retrospective Study

ObjectiveTo investigate the distribution and antimicrobial susceptibility of causative microorganisms recovered from patients with intra-abdominal infections (IAIs). MethodsA total of 2,926 bacterial and fungal strains were identified in samples collected from 1,679 patients with IAIs at the Peking Union Medical College Hospital between 2011 and 2021. Pathogenic bacteria and fungi were identified using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Antimicrobial susceptibility testing (AST) was performed using the VITEK 2 compact system and the Kirby–Bauer method. AST results were interpreted based on the M100-Ed31 clinical breakpoints of the Clinical and Laboratory Standards Institute. ResultsOf the 2,926 strains identified, 49.2%, 40.8%, and 9.5% were gram-negative bacteria, gram-positive bacteria, and fungi, respectively. Escherichia coli was the most prevalent pathogen in intensive care unit (ICU) and non-ICU patients; however, a significant decrease was observed in the isolation of E. coli between 2011 and 2021. Specifically, significant decreases were observed between 2011 and 2021 in the levels of extended-spectrum β-lactamase (ESBL)-producing E. coli (from 76.9% to 14.3%) and Klebsiella pneumoniae (from 45.8% to 4.8%). Polymicrobial infections, particularly those involving coinfection with gram-positive and gram-negative bacteria, were commonly observed in IAI patients. Moreover, Candida albicans was more commonly isolated from hospital-associated IAI samples, while Staphylococcus epidermidis had a higher ratio in community-associated IAIs. Additionally, AST results revealed that most antimicrobial agents performed better in non-ESBL-producers than in ESBL-producers, while the overall resistance rates (56.9%–76.8%) of Acinetobacter baumanmii were higher against all antimicrobial agents than those of other common gram-negative bacteria. Indeed, Enterococcus faecium, Enterococcus faecalis, S. epidermidis, and S. aureus were consistently found to be susceptible to vancomycin, teicoplanin, and linezolid. Similarly, C. albicans exhibited high susceptibility to all the tested antifungal drugs. ConclusionThe distribution and antimicrobial susceptibility of the causative microorganisms from patients with IAIs were altered between 2011 and 2021. This finding is valuable for the implementation of evidence-based antimicrobial therapy and provides guidance for the control of hospital infections.

Predictor of Mortality in Complicated Intraabdominal Infection Patients at Dr. Soetomo General Hospital Surabaya

Link of Video Abstract: https://youtu.be/g_ys7cQCuDYBackground: Complicated intraabdominal infection (cIAI) is a surgical emergency reported to be a major contributor to non-traumatic mortality worldwide. Identifying the mortality risk before any operation is important in guiding clinical decision-making and informed patient consent about the risk of complicated intraabdominal infection (cIAI). The study aimed to develop a novel scoring system for predicting postoperative mortality in cIAI. Methods: Data were collected retrospectively from all consecutive patients 396 patients met the inclusion criteria after excluding missing data undergoing cIAI surgery in Dr. Soetomo Hospital 2020 - 2022. Multivariate logistic regression analysis was performed to correlate the explanatory variable postoperative mortality. Data were analyzed using SPSS version 20.0 for Windows and MedCalc. Results: Postoperative mortality rate cIAI was 32,2% (128 of 396), and variables identified as the strongest predictors of postoperative mortality were age > 60 y.o (OR 3,196), systolic blood pressure < 100 mmHg (OR 5,894), thrombocyte < 100.000 /uL (OR 5,593), albumin ≤ 2,9 g/dL (OR 6,764), total bilirubin > 1,8 mg/dL (OR 2,180), creatinine serum ≥ 1,58 mg/dL (OR 4,290), cancer comorbidity (OR 3,578), and appendix perforation as negative predictor (OR 5,853). These parameters were included in the prediction model of the novel simplified Airlangga Scoring System. Conclusion: Despite the relatively low number of risk factors, the Airlangga score has been shown as a good predictor of postoperative mortality after cIAI. External validation is required in hospitals different from those in which the novel scoring system was developed.

Intra-abdominal infection after tumor surgery: tigecycline combined with β-lactam antibiotics versus tigecycline alone

BackgroundsTigecycline has a broad spectrum of antimicrobial activity and has been approved for the treatment of complicated intra-abdominal infections. However, it is debatable whether tigecycline should be used alone or in combination. This study aimed to investigate whether tigecycline plus β-lactam antibiotics (combination therapy [CT] group) are superior to tigecycline alone (monotherapy [MT] group) in non-critically ill intra-abdominal infection patients after tumor surgery.MethodsThis was a multicenter, retrospective cohort study. The primary outcome was mortality during the hospital stay. Secondary outcomes were clinical success rate, microbial eradication rate, relapse rate within one week, course of treatment, and adverse effects. Propensity score matching (PSM) was used to adjust the degree of infection before medication between the MT and CT groups. Univariate comparisons were performed using the chi-squared test for qualitative variables and Student’s t-test or the Mann-Whitney U-test for continuous variables, as appropriate. Multivariate logistic regression analysis was performed to examine the relationship between antimicrobial treatments and mortality during hospitalization. The paired samples Wilcoxon test was used to compare the parameters before and after medication.ResultsIn total, 291 patients were included in the final analysis: 128 in MT group and 163 in CT group. Mortality rate was 6.25% in the MT group and 6.13% in the CT group (P = 0.97). Multivariate logistic regression model showed that carbapenem-resistant organisms (OR: 4.35, 95% CI: 2.36 ~ 61.70) and age > 65 (OR: 1.32, 95% CI:1.19 ~ 3.01) were independent risk factors for death. CT group had a shorter defervescence time (P < 0.05), with less likelihood of relapse (P < 0.05) but had a more significant effect on activated partial thromboplastin and prothrombin time.ConclusionsTigecycline plus β-lactam wasn’t superior to tigecycline monotherapy for the treatment of non-critically ill patients with intra-abdominal infection. But for advanced age patients with cancer, tigecycline combination therapy maybe a better choice in terms of mortality.

Evaluation of the Diagnostic Performance of mNGS in Detecting Intra-Abdominal Infections of the Emergency Department Patients.

Intra-abdominal infections (IAI) are gradually becoming common in the emergency department, though the incidence is low and the prognosis is fair, as the symptoms are similar to other intra-abdominal diseases, rapid and accurate diagnosis of the causative agents is essential for clinical management. This study aimed to evaluate the diagnostic performance of metagenomic next-generation sequencing (mNGS) in detecting IAI in the emergency department. This was a retrospective, single-centered study including patients admitted to the emergency department from January 1st, 2021 to August 31st, 2022 with diagnosis of IAI. The comparison between mNGS and microbial culture using paracentesis fluid samples was performed to evaluate the diagnostic performance of mNGS for IAI. Meanwhile, paracentesis fluid and peripheral blood mNGS were compared to explore the sample specificity. Further, the microbial community structure of the patients with pyogenic liver abscesses (PLA) was analyzed. Thirty-four IAI patients including 23 with pyogenic liver abscesses (PLA), 3 with parapancreatic abscesses, and 8 with other IAI were included in this study. Compared with the conventional microbial culture of paracentesis fluid, mNGS using paracentesis fluid detected more positive cases of IAI (93.75% vs 81.25%), and identified more species of pathogens, especially in obligate anaerobes and viral pathogens. Peripheral blood mNGS presented a relatively high consistency with the paracentesis fluid mNGS (91% mutual positive). The microbial community structure of PLA patients with diabetes is less diverse than that of those without diabetes. Patients with diabetes are at high risk of PLA caused by Klebsiella pneumonia. mNGS has advantages in detecting IAI in the emergency department, and peripheral blood mNGS can be a non-invasive choice for early diagnosis.

Ceftolozane/Tazobactam In-Vitro Activity against Clinical Isolates from Complicated Intra-Abdominal Infection Patients in Three Indonesian Referral Hospitals.

Complicated intra-abdominal infections (cIAIs) lead to high morbidity and mortality, especially if poorly managed. However, Indonesia's microbial pattern and susceptibility data are limited, especially for new antibiotics. Ceftolozane/tazobactam (C/T) is reported to be a new potent antibiotic against various pathogens. Thus, we aim to investigate C/T in vitro activity against clinical isolates from cIAI patients. This prospective cross-sectional study was conducted in three major referral hospitals in Indonesia, including Dr. Cipto Mangunkusumo Hospital (Jakarta), Dr. Kariadi Hospital (Semarang), and Dr. Soetomo Hospital (Surabaya), enrolling those diagnosed with cIAIs. Blood specimens were collected before or after at least 72 h of the last antibiotic administration. Meanwhile, tissue biopsy/aspirate specimens were collected intraoperatively. These specimens were cultured, followed by a susceptibility test for specific pathogens. The minimum inhibitory concentration (MIC) of isolates was determined according to CLSI M100. Two-hundred-and-eighty-four patients were enrolled from 2019-2021. Blood culture was dominated by Gram-positive bacteria (GPB, n = 25, 52.1%), whereas abdominal tissue culture was dominated by Gram-negative bacteria (GNB, n = 268, 79.5%). The three most common organisms were GNB, including E. coli, K. pneumoniae, and P. aeruginosa. C/T was susceptible in 96.7%, 70.2%, and 94.1% of the E. coli, K. pneumoniae, and P. aeruginosa isolates, respectively. In addition, C/T also remained active against ESBL Enterobacterales and carbapenem-non-susceptible P. aeruginosa. Overall, C/T demonstrates a high potency against GNB isolates and can be considered an agent for carbapenem-sparing strategy for cIAI patients as the susceptibility is proven.

121. Evaluation of Multifaceted Antimicrobial Stewardship in Optimizing Antimicrobial Usage in Intraabdominal Infection at a Community Hospital

BackgroundTreatment of intraabdominal infections (IAI) commonly involves broad spectrum antimicrobials based on the severity and etiology of infections as well as the underlying medical conditions. However, the overuse of broad-spectrum agents has driven selection for Gram-negative and -positive resistance, as well as collateral consequences such as Clostridioides difficile colitis. We sought to evaluate the utilization of a pharmacy-driven multifaceted antimicrobial stewardship (AMS) intervention to optimize empiric antimicrobial therapy by risk stratification among IAI patients and reduce the number of antibiotic treatment days.MethodsThis is a single-center case observation study in hospitalized adult IAI patients on antimicrobial therapy from Dec 2019-Feb 2020 compared to patients from Dec 2020-Feb 2021 after initiation of AMS with daily prospective audit and feedback. The composite primary outcome is reduction of antibiotic treatment days and de-escalation from broad spectrum antibiotics (fluoroquinolones, piperacillin/tazobactam, and carbapenems) to cephalosporins. ResultsWe identified 40 patients each in the baseline (pre-AMS group) and post-AMS group via electronic medical record. Baseline characteristics were well-matched between groups. The majority of patients were diagnosed with community-acquired IAIs such as appendicitis, diverticulitis, and cholecystitis. Fluoroquinolone use as empiric therapy was significantly lower in the post-AMS group vs. pre-AMS group (2.5% vs. 25%, p< 0.001), while non-Pseudomonas cephalosporin use was increased (25% post-AMS vs. 0% pre-AMS, p< 0.001). Oral fluoroquinolone use at discharge was significantly decreased in the post-AMS group (p< 0.001). Antibiotic treatment days remained unchanged. There was no statistical difference between the two groups in 30-day mortality, 30-day readmission, relapse, and C. difficile colitis.ConclusionA multifaceted antimicrobial therapy intervention successfully reduced the use of fluoroquinolones in patients with community-acquired IAI during hospitalization and discharge. No differences in mortality, readmission, or relapse rates were observed.Disclosures All Authors: No reported disclosures

Dynamics of changes in plasma fatty acid binding proteins and intestinal zonulin in patients with generalized intra-abdominal infection and abdominal sepsis depending on the severity of patients

Objective. Determine the levels of plasma intestinal fatty acid binding proteins levels in combination with zonulin in patients with generalized intra-abdominal infection and abdominal sepsis, and define the clinical usefulness them to assess the severity of patients.&#x0D; Materials ad methods. This study was based on an analysis of 59 patients of both sexes aged 18 to 70 years with generalized intra-abdominal infection (gIAI) and abdominal sepsis (AS).&#x0D; Results. According to the aims and objectives of the study the patients were divided into three groups: the 1st group - 26 patients with generalized peritonitis without sepsis according to the «Sepsis-3» criterion; the 2nd group - 24 patients with sepsis, and the 3rd group - 9 patients with septic shock. We found statistically significant higher levels of I-FABP in the all groups of patients (P = 0.000). The same tendency was observed in all periods of the study, and the most significant levels of I-FABP were by the tenth day after surgery in patients with septic shock: IQR 1567.3- 3876.1 (P = 0.000). Patients with abdominal sepsis did not have a statistically significant change in zonulin levels compared to patients with gIAI without sepsis (P = 0.560) and a similar trend was observed on the 3rd day after surgery (P = 0.135). Only by the 7th and 10th days after surgery changes in zonulin levels were significant in intra-abdominal infection patients without sepsis, with abdominal sepsis and septic shock (P = 0.000 and P = 0.004, respectively).&#x0D; Conclusions. Serum I-FABP levels were valuable and objectively early predictors of the severity of gastrointestinal injuries in gIAI. We also presented evidence of increased plasma zonulin levels in generalized intra-abdominal infection compared with the control group. Elevated zonulin levels were an additional indicator of the observed increase in intestinal permeability during gIAI, but zonulin was not an early biomarker of the severity of gastrointestinal damage like I-FABP.

Value of procalcitonin and critical illness score in etiological diagnosis and prognosis of sepsis caused by intra-abdominal infections

To compare the early and late predictive values of critical illness score (CIS) and procalcitonin (PCT) in septic patients with blood stream infection (BSI) induced by intra-abdominal infection (IAI), and to identify the value of PCT in etiological diagnosis. The clinical data of patients with at least one positive blood culture within 24 hours admission to the emergency department of China-Japan Friendship Hospital from January 2014 to December 2019 and with final diagnosis of IAI induced sepsis were enrolled. Sequential organ failure assessment (SOFA), mortality in emergency department sepsis (MEDS), Logistic organ dysfunction system (LODS), and acute physiology and chronic health evaluation II (APACHE II) scores were calculated based on the parameters on the day of admission. Differences in various indicators among different Gram-stained bacterial infections and among patients with different prognosis at 28 days or 60 days were compared. Receiver operator characteristic curve (ROC curve) was used to analyze the value of PCT in differential etiological diagnosis of IAI induced sepsis caused by single bacterial infection, and the predictive value of CIS and PCT on 28-day and 60-day death of septic patients with BSI induced by IAI. A total of 221 septic patients with IAI caused by single bacterial infection were enrolled. The 28-day mortality was 19.9% (44/221), and the 60-day mortality was 25.8% (57/221). Mortality caused by Gram-positive (G+) bacterial infection of patients was significantly higher than that caused by Gram-negative (G-) bacterial infection (28 days: 34.6% vs. 11.4%, 60 days: 42.0% vs. 16.4%, both P < 0.01). Compared with patients with G+ bacterial infection, the PCT value of patients with G- bacterial infection was higher [μg/L: 4.31 (0.71, 25.71) vs. 1.29 (0.32, 10.83), P < 0.05]. Compared with survival group, the values of CIS and PCT in death group were higher, either in 28 days or in 60 days [death group vs. survival group in 28 days: SOFA score was 6.0 (4.0, 10.0) vs. 3.0 (2.0, 5.0), MEDS score: 11 (9, 14) vs. 6 (6, 9), LODS score: 4.0 (2.0, 6.0) vs. 1.0 (0, 2.0), APACHE II score: 17.0 (15.0, 24.0) vs. 12.0 (8.0, 15.0), PCT (μg/L): 3.48 (1.01, 26.70) vs. 2.45 (0.32, 15.65); death group vs. survival group in 60 days: SOFA score: 6.0 (4.0, 10.0) vs. 3.0 (2.0, 5.0), MEDS score: 9 (6, 14) vs. 6 (6, 9), LODS score: 4.0 (1.0, 5.0) vs. 1.0 (0, 2.0), APACHE II score: 16.5 (12.0, 20.0) vs. 12.0 (8.0, 15.0), PCT (μg/L): 2.67 (0.98, 17.73) vs. 2.22 (0.31, 16.75); all P < 0.05]. ROC curve showed that: (1) the area under ROC curve (AUC) of PCT in the diagnosis of IAI induced sepsis with single bacterial infection was 0.740 [95% confidence interval (95%CI) was 0.648-0.833]. When the optimal cut-off value of PCT was 1.82 μg/L, the sensitivity of diagnosis of G- bacterial infection was 74.0%, and the specificity was 68.2%. When PCT value was higher than 10.92 μg/L, the specificity of diagnosis of G- bacterial infection could reach 81.8%. (2) In the prediction of 28-day and 60-day mortality for septic patients with BSI induced by IAI, the APACHE II score achieved the highest AUC [28 days: 0.791 (95%CI was 0.680-0.902), 60 days: 0.748 (95%CI was 0.645-0.851)]. APACHE II score higher than 14.5 could help to predict 28-day and 60-day mortality for IAI patients with negative predictive values of 94.9% and 88.5%. However, the predictive value of PCT for septic patients with BSI induced by IAI was relatively lower [28-day AUC: 0.610 (95%CI was 0.495-0.725), 60-day AUC: 0.558 (95%CI was 0.450-0.667)]. PCT is more reliable in the identification of pathogen type among IAI induced sepsis with BSI, while APACHE II score may perform better in predicting early and late mortality.

Management strategy of lung protection in patients with intra-abdominal infection

Lung protection is important in the treatment of patients with intra-abdominal infection (IAI). This article focuses on the management strategy of lung protection in IAI patients. In the implementation of IAI individual respiratory protection, good humidification and chest physical therapy, nutritional support, strict balloon management, keeping a semi-supine position, and reducing the duration and depth of analgesia and sedation are helpful to maintain effective coughing capacity and prevent silent aspiration. It is also necessary to prevent ventilator-associated lung injury in mechanical ventilation, and implement strategies of small tidal volume, limited platform pressure, diaphragmatic protection and right heart protection ventilation in acute respiratory distress syndrome (ARDS). Respiratory mechanical indicators, including airway resistance, respiratory compliance, maximum inspiratory pressure (MIP), and airway closure pressure (P0.1) can be used in IAI patients receiving mechanical ventilation for individualized assessment and monitoring of respiratory functional status. Patients with IAI who have not been treated with mechanical ventilation can use simplified bedside lung function indicators, including forced vital capacity of inhalation and exhalation, maximum inspiratory pressure and exhalation pressure, as well as volume and rate of 1s. In pulmonary rehabilitation, the protection technique of the seven-word principle of humidification, turning, patting, coughing, expansion, blowing and mobilization are implemented.

Antimicrobial Susceptibility and Virulence of mcr-1-Positive Enterobacteriaceae in China, a Multicenter Longitudinal Epidemiological Study.

This study was to investigate the prevalence of mcr-1-positive Enterobacteriaceae (MPE) in intra-abdominal infections (IAIs), urinary tract infections (UTIs), and lower respiratory tract infections (LRTIs) in China. A total of 6,401 Enterobacteriaceae isolates were collected consecutively from IAI, UTI, and LRTI patients in 19 hospitals across mainland China during 2014–2016. MPE isolates were screened by PCR detection for the mcr gene. The resistance profiles were tested by antimicrobial susceptibility test. All MPE isolates were characterized by pulsed-field gel electrophoresis (PFGE), multi-locus-sequence typing, O and H serotyping, and whole-genome sequencing. Among the 6,401 Enterobacteriaceae isolates, 17 Escherichia coli strains (0.27%) were positive for the mcr-1 gene. The MPE prevalence rates in IAI, UTI, and LRTI patients were 0.34% (12/3502), 0.23% (5/2154), and 0% (0/745), respectively. The minimum inhibition concentrations (MICs) of colistin against 3 isolates were of 0.5–2 mg/L, and 4–8 mg/L against other 14 isolates. All the 17 isolates were susceptible to meropenem, imipenem, tigecycline, and ceftazidime/avibactam. The 17 MPE isolates belonged to 14 different ST types, and those that belonged to the same STs were not clonal by PFGE. The mcr-1-harboring plasmid of ten MPE isolates could transfer to the recipients by conjugation and the colistin MICs of the transconjugants ranged from 0.5 to 8 mg/L. Mcr-1-carrying plasmids from the 17 MPE isolates could be grouped into four clusters, including 8 IncX4 type, 4 IncI2 type, 4 IncHI2A type, and 1 p0111 type. Multiple-drug resistance genes and virulence genes were detected. In conclusion, the prevalence of MPE in IAI, UTI, and LRTI were low in China, and no clonal transmission was identified in our study. Most MPE isolates exhibited low-level colistin resistance. However, our study indicated that MPE isolates always carried a variety of drug resistance and virulence genes, which should be paid more attention.

Open abdomen treatment for complicated intra-abdominal infection patients with gastrointestinal fistula can reduce the mortality.

To evaluate the effect of the open abdomen (OA) and closed abdomen (CA) approaches for treating intestinal fistula with complicated intra-abdominal infection (IFWCIAI), and analyze the risk factors in OA treatment.IFWCIAI is associated with high mortality rates and healthcare costs, as well as longer postoperative hospital stay. However, OA treatment has also been linked with increased mortality and development of secondary intestinal fistula.A total of 195 IFWCIAI patients who were operated over a period of 7 years at our hospital were retrospectively analyzed. These patients were divided into the OA group (n = 112) and CA group (n = 83) accordingly, and the mortality rates, hospital costs, and hospital stay duration of both groups were compared. In addition, the risk factors in OA treatment were also analyzed.OA resulted in significantly lower mortality rates (9.8% vs 30.1%, P < .001) and hospital costs ($11721.40 ± $9368.86 vs $20365.36 ± $21789.06, P < .001) compared with the CA group. No incidences of secondary intestinal fistula was recorded and the duration of hospital stay was similar for both groups (P = .151). Delayed OA was an independent risk factor of death following OA treatment (hazard ratio [HR] = 1.316; 95% confidence interval [CI] = 1.068–1.623, P = .010), whereas early enteral nutrition (EN) exceeding 666.67 mL was a protective factor (HR = 0.996; 95% CI = 0.993–0.999, P = .018). In addition, Acinetobacter baumannii, Pseudomonas aeruginosa, and Candida albicans were the main pathogens responsible for the death of patients after OA treatment.OA decreased mortality rates and hospital costs of IFWCIAI patients, and did not lead to any secondary fistulas. Early OA and EN also reduced mortality rates.

Research progress of the open abdomen in the treatment of gastrointestinal fistula with complicated intra-abdominal infection

Gastrointestinal fistula patients may suffer from complicated intra-abdominal infection and sepsis with improper treatment, which is characterized by high mortality ranging from 20% to 60%, as well as high medical costs. Gastrointestinal fistula patients with complicated intra-abdominal infections are not often diagnosed early, and proper treatment remains an unsolved problem. Therefore it is a great challenge for surgeons to repair broken intestines under complicated intra-abdominal infection conditions and to repair ruptured intestines under conditions of severe abdominal adhesions and swelling of the intestinal wall and mesentery. After the open abdominal approach was first adopted to treat complicated intra-abdominal infection patients by Duff and Moffat in 1981, it gradually began to be used more widely. However, some investigators have reported that the open abdomen approach has not been effective in controlling controlled mortality, instead, it may even increase mortality. For this reason, the approach has only been used in large medical centers rather than having been widely popularized. In this review, the effect, timing, indications of open abdomen approach and the principles for the open abdominal wound management are summarized, and the reason for the various efficacy among different centers is also analyzed. We provide a new perspective for clinicians to manage the gastrointestinal fistula patients with complicated intra-abdominal infection.

Risk factor analysis and strategy of intra-abdominal infection

Multiple factors can lead to treatment failure and death in the patients with intra-abdominal infection. These factors include advanced age, malignancy, significant cardiovascular compromise, significant liver and renal diseases, hypo-albuminemia, diffuse peritonitis, delayed initial source control, delayed and unexpected initial source control, and suspected infection with resistant pathogens. Scoring system such as Mannheim Peritonitis Index (MPI) and complicated intra-abdominal score can also help to evaluate the risk of intra-abdominal infection patients. Sepsis and septic shock are important risk factors. Treatment strategies include prompt resuscitation and organ function support, early appropriate source control measures, effective antibiotics coverage of pathogens, prevention and treatment of resistant bacterial. Key words: Intra-abdominal infection; Risk factors; Resuscitation; Source control

Update of incidence and antimicrobial susceptibility trends of Escherichia coli and Klebsiella pneumoniae isolates from Chinese intra-abdominal infection patients

BackgroundTo evaluate in vitro susceptibilities of aerobic and facultative Gram-negative bacterial (GNB) isolates from intra-abdominal infections (IAIs) to 12 selected antimicrobials in Chinese hospitals from 2012 to 2014.MethodsHospital acquired (HA) and community acquired (CA) IAIs were collected from 21 centers in 16 Chinese cities. Extended spectrum beta-lactamase (ESBL) status and antimicrobial susceptibilities were determined at a central laboratory using CLSI broth microdilution and interpretive standards.ResultsFrom all isolated strains the Enterobacteriaceae (81.1%) Escherichia coli accounted for 45.4% and Klebsiella pneumoniae for 20.1%, followed by Enterobacter cloacae (5.2%), Proteus mirabilis (2.1%), Citrobacter freundii (1.8%), Enterobacter aerogenes (1.8%), Klebsiella oxytoca (1.4%), Morganella morganii (1.2%), Serratia marcescens (0.7%), Citrobacter koseri (0.3%), Proteus vulgaris (0.3%) and others (1.0%). Non- Enterobacteriaceae (18.9%) included Pseudomonas aeruginosa (9.8%), Acinetobacter baumannii (6.7%), Stenotrophomonas maltophilia (0.9%), Aeromonas hydrophila (0.4%) and others (1.1%). ESBL-screen positive Escherichia coli isolates (ESBL+) showed a decreasing trend from 67.5% in 2012 to 58.9% in 2014 of all Escherichia coli isolates and the percentage of ESBL+ Klebsiella pneumoniae isolates also decreased from 2012 through 2014 (40.4% to 26.6%), which was due to reduced percentages of ESBL+ isolates in HA IAIs for both bacteria. The overall susceptibilities of all 5160 IAI isolates were 87.53% to amikacin (AMK), 78.12% to piperacillin-tazobactam (TZP) 81.41% to imipenem (IMP) and 73.12% to ertapenem (ETP). The susceptibility of ESBL-screen positive Escherichia coli strains was 96.77%–98.8% to IPM, 91.26%–93.16% to ETP, 89.48%–92.75% to AMK and 84.86%–89.34% to TZP, while ESBL-screen positive Klebsiella pneumoniae strains were 70.56%–80.15% susceptible to ETP, 80.0%–87.5% to IPM, 83.82%–87.06% to AMK and 63.53%–68.38% to TZP within the three year study. Susceptibilities to all cephalosporins and fluoroquinolones were less than 50% beside 66.5% and 56.07% to cefoxitin (FOX) for ESBL+ Escherichia coli and Klebsiella pneumoniae strains respectively.ConclusionsThe total ESBL+ rates decreased in Escherichia coli and Klebsiella pneumoniae IAI isolates due to fewer prevalence in HA infections. IPM, ETP and AMK were the most effective antimicrobials against ESBL+ Escherichia coli and Klebsiella pneumoniae IAI isolates in 2012–2014 and a change of fluoroquinolone regimens for Chinese IAIs is recommended.

The risk factors and bacterial susceptibility analysis of in severe acute pancreatitis complicated with intra-abdominal infections

Objective The aim of the study was to find out the risk factors of the severe acute pancreatitis(SAP)complicated with intra-abdominal infections according to the retrospective analysis of the clinical data of 280 patients with SAP in Quanzhou First Hospital of Fujian Medical University,and to analyze the bacterial spectrum,drug sensitivity in patients with intra-abdominal infections for clinical diagnosis and treatment. Methods Collected the clinical data of 280 patients,the relationship between the factors which have significant difference in patients complicated with intra-abdominal infections and no intra-abdominal infections patients was explored according to the Logistic regression analysis,and analysized the predisposing factor of SAP complicated with the intra-abdominal infections.The ascite specimens and the necrotic tissues of SAP patients complicated with the intra-abdominal infections were harvested for bacterial culture and drug sensitivity analysis. Results The Multiple organ dysfunction syndrome,seroperitoneum,Ca and intestinal dysfunction were the risk factors of SAP with the intra-abdominal infections,the main pathogenic bacteria was gram-negative bacteria.The top two gram-negative bacteria were Escherichia coli,pseudomonas aeruginosa,and the top two gram-positive bacterium were enterococcus,staphylococcus aureus.They were generally not sensitive to common antibiotics. Conclusion The early therapy of SAP complicated with the intra-abdominal infections should be basd on the risk factors,bacterial spectrum,and drug sensitivity,in order to increase the clinical therapeutic effect. Key words: Severe acute pancreatitis; Intra-abdominal infections; Logistic regression analysis; Bacterial susceptibility testing

Risk factors and long-term outcome for postoperative intra-abdominal infection after hepatectomy for hepatocellular carcinoma.

Intra-abdominal infection (IAI) after hepatectomy is an important morbidity. Identification of risk factors that could be avoided in the perioperative period may reduce the prevalence of IAI after hepatectomy for hepatocelluar carcinoma (HCC).Between January 1995 and December 2009, all patients with HCC who underwent curative liver resection were evaluated retrospectively. Long-term outcomes were compared in IAI patients and non-IAI patients after hepatectomy. Preoperative, intraoperative, and tumor-related factors that could be independent factors for postoperative IAI were identified.Of 622 patients with HCC, 24 patients (3.9%) had IAI after hepatectomy. Both median survival and survival of patients with postoperative IAI were shorter than those for non-IAI patients (P < .05). Upon univariate analysis followed by multivariate analyses, three independent predictors for IAI were identified: weight loss (odds ratio [OR], 3.27; 95% confidence interval [CI], 1.17–9.11; P = .024), liver cirrhosis (0.28, 0.12–0.67, .004), and operative time >300 minutes (3.44, 1.46–8.12, .005).IAI after hepatectomy affects outcome adversely. Preoperative weight loss, liver cirrhosis, and operative time >300 minutes are independent predictors of postoperative IAI.

OP115 Effect Of Multiple Drug Resistance On Costs For Patients With Intra-Abdominal Infections in China

INTRODUCTION:Multiple drug resistance (MDR) intra-abdominal infections (IAIs) are associated with noteworthy direct and societal costs. Compared to previous studies, the present one takes both resistance rate and total medical costs (TMCs) into consideration, focusing on the impact of MDR on TMCs in IAIs, as well as further estimating the additional costs at a national level.METHODS:All inpatients discharged between 1 January 2014, and 31 December 2015 from a teaching hospital were included. Due to limits in budget and the large number of inpatients, the randombetween (bottom, top) function was applied to randomly select 40 percent of patients per year. Subsequently, we manually screened out 254 patients with IAIs, according to the International Classification of Disease (tenth revision) and electronic medical records. Eventually, 101 IAIs patients were included, in which 37 were infected by non-MDR bacteria and 64 by MDR bacteria. The Kruskal-wallis non-parametric test and multiple linear regression were employed to analyze the effect of single and multiple variables on TMCs.RESULTS:Compared to patients with non-MDR infections, those with MDR were associated with significantly higher TMCs, higher antimicrobial costs, increased insurance, combination antimicrobial therapy, higher usage of antimicrobial agents, greater number of pathogens, longer length of stay, and longer intensive care unit stays. In addition, the average TMCs among patients with MDR were CNY131,801.17 (1USD was equal to CNY 6.227 in 2015), which were CNY 90,200.99 higher than those with non-MDR infections. If our results are generalizable to the whole country, the total attributable TMCs are estimated to be CNY37.06 billion, and the societal costs of CNY111.18 billion in 2015.CONCLUSIONS:This real-world data analysis demonstrated the significant excessive burden MDR infections are posing to the current Chinese healthcare system in terms of both TMCs and healthcare resource utilization. Enhanced antimicrobial stewardship in China is necessary to curb the distribution of MDR bacteria.

Obesity Is Not Associated with Antimicrobial Treatment Failure for Intra-Abdominal Infection.

Obesity and commonly associated comorbidities are known risk factors for the development of infections. However, the intensity and duration of antimicrobial treatment are rarely conditioned on body mass index (BMI). In particular, the influence of obesity on failure of antimicrobial treatment for intra-abdominal infection (IAI) remains unknown. We hypothesized that obesity is associated with recurrent infectious complications in patients treated for IAI. Five hundred eighteen patients randomized to treatment in the Surgical Infection Society Study to Optimize Peritoneal Infection Therapy (STOP-IT) trial were evaluated. Patients were stratified by obese (BMI ≥30) versus non-obese (BMI≥30) status. Descriptive comparisons were performed using Chi-square test, Fisher exact test, or Wilcoxon rank-sum tests as appropriate. Multivariable logistic regression using a priori selected variables was performed to assess the independent association between obesity and treatment failure in patients with IAI. Overall, 198 (38.3%) of patients were obese (BMI ≥30) versus 319 (61.7%) who were non-obese. Mean antibiotic d and total hospital d were similar between both groups. Unadjusted outcomes of surgical site infection (9.1% vs. 6.9%, p = 0.36), recurrent intra-abdominal infection (16.2% vs. 13.8, p = 0.46), death (1.0% vs. 0.9%, p = 1.0), and a composite of all complications (25.3% vs. 19.8%, p = 0.14) were also similar between both groups. After controlling for appropriate demographics, comorbidities, severity of illness, treatment group, and duration of antimicrobial therapy, obesity was not independently associated with treatment failure (c-statistic: 0.64). Obesity is not associated with antimicrobial treatment failure among patients with IAI. These results suggest that obesity may not independently influence the need for longer duration of antimicrobial therapy in treatment of IAI versus non-obese patients.

Bacteriology and antimicrobial susceptibility of ESBLs producers from pus in patients with abdominal trauma associated intra-abdominal infections.

Intra-abdominal infections (IAIs) caused by ESBLs producing bacteria have become a serious clinical concern worldwide as the prevalence of bacterial resistance to antibiotics continues to increase. The objective of this study was to analyze the bacteriology and antimicrobial susceptibility of ESBLs producers using pus samples from IAIs patients caused by abdominal trauma. A total of 113 pus samples aspirated from IAIs patients were collected. The BACTEC 9120 and Vitek 2 system were used for detecting positive pathogens and confirming ESBLs production. The results of susceptibility were determined following the Clinical Laboratory Standards Institute guidelines. Among the pathogens causing IAIs, Escherichia coli (E. coli) (29.1%) was the most commonly isolated, followed by Klebsiella pneumoniae (K. pneumoniae) (22.5%). The incidence rates of ESBLs production among E. coli, K. pneumoniae, and Klebsiella oxytoca were 69.6, 45.1, and 25.0%, respectively. All pathogens had high resistance rates against studied antibiotics, with imipenem (88.7%) and ertapenem (90.7%) remaining the only practical options. Trend analysis documented an increase in ESBLs producing E. coli and K. pneumoniae, and a decrease in susceptibility for carbapenems among ESBLs producing E. coli and K. pneumoniae. Escherichia coli and K. pneumoniae were the major pathogens causing abdominal trauma associated IAIs. The most active agents against ESBLs producing E. coli and K. pneumoniae were ertapenem and imipenem. However, the ESBLs rates were alarmingly high and increasing among IAIs associated gram-negative bacilli infections in China, and most agents exhibited decreased susceptibility against ESBLs producing pathogens.

The Incidence, Clinical Outcomes, and Risk Factors of Thrombocytopenia in Intra-Abdominal Infection Patients: A Retrospective Cohort Study.

BackgroundStudies on the incidence and risk factors of thrombocytopenia among intra-abdominal infection patients remain absent, hindering efficacy assessments regarding thrombocytopenia prevention strategies.MethodsWe retrospectively studied 267 consecutively enrolled patients with intra-abdominal infections. Occurrence of thrombocytopenia was scanned for all patients. All-cause 28-day mortality was recorded. Variables from univariate analyses that were associated with occurrence of hospital-acquired thrombocytopenia were included in a multivariable logistic regression analysis to determine thrombocytopenia predictors.ResultsMedian APACHE II score and SOFA score of the whole cohort was 12 and 3 respectively. The overall ICU mortality was 7.87% and the 28-day mortality was 8.98%. The incidence of thrombocytopenia among intra-abdominal infection patients was 21.73%. Regardless of preexisting or hospital-acquired one, thrombocytopenia is associated with an increased ICU mortality and 28-day mortality as well as length of ICU or hospital stay. A higher SOFA and ISTH score at admission were significant hospital-acquired thrombocytopenia risk factors.ConclusionsThis is the first study to identify a high incidence of thrombocytopenia in patients with intra-abdominal infections. Our findings suggest that the inflammatory milieu of intra-abdominal infections may uniquely predispose those patients to thrombocytopenia. More effective thrombocytopenia prevention strategies are necessary in intra-abdominal infection patients.