Risk Factors For Surgical Site Infection Research Articles

Risk Factors for Deep Surgical Site Infection in Patients With Operatively Treated Tibial Plateau Fractures: A Retrospective Multicenter Study.

To identify the potential controllable risk factors for surgical site infection (SSI). A retrospective cohort study. Seven Level-I trauma centers. Patients with OTA/AO 41 B or C tibial plateau fractures (n = 2106). Various surgical treatments for tibial plateau fractures. The primary outcome was SSI after the index operation. The secondary outcomes were the risk factors for SSI, identified using backward stepwise generalized multiple regression analysis. Of the 2106 enrolled patients, 94 had deep SSIs. The average SSI rate was 4.5%. Fracture morphology revealed type B injuries in 57.5% and type C in 42.5% of the patients. Univariate regression analysis revealed that several factors, namely, number of comorbidities [>6 vs. none; odds ratio (OR) 8.01, 95% confidence interval (CI) 2.8-22.8, P < 0.001], diabetes mellitus (OR 3.5, 95% CI 2.0-6.3, P < 0.001), high body mass index (OR 1.3, 95% CI 1.1-1.6, P = 0.001), OTA/AO fracture type C (OR 5.6, 95% CI 3.3-9.5, P < 0.001), compartment syndrome (OR 9.1, 95% CI 5.7-14.8, P < 0.001), and open fracture (OR 6.6, 95% CI 3.7-11.7, P < 0.001), were associated with a significantly higher SSI risk. Analysis of microbial sensitivity tests revealed that 55.1% of the pathogens were resistant to perioperative antibiotic prophylaxis. Most of the identified risk factors cannot be controlled or are subject to other factors that are difficult to control. However, our data suggest that the choice of perioperative antibiotic prophylaxis may influence the rate of SSI. This possibility should be investigated in a prospective randomized controlled trial. Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Antibiotics in orthognathic surgery: a retrospective analysis and identification of risk factors for postoperative infection

This study was undertaken to evaluate the infection rate following orthognathic surgery and to identify possible risk factors. A retrospective study was conducted. Patients undergoing orthognathic surgery from August 1, 2017 to July 31, 2018 were included. The outcome variable was surgical site infection (SSI). All data were analysed with respect to demographics and procedure specifications. A total of 137 patients (mean age 28.5±12.69 years) were included in this study, of whom 20 (14.6%) developed a SSI. The only risk factor identified was the type of surgery: those undergoing mandibular osteotomies (in bilateral sagittal split osteotomy (BSSO) or bimaxillary osteotomies) were far more likely to develop infections. Third molar teeth were removed during orthognathic surgery in 28.5% of the procedures, and a genioplasty was performed in 10.9%. Removal of osteosynthesis material because of infectious reasons was necessary in 10.2% of patients, with a strong association to previous SSI. In conclusion, this study showed an infection rate of 14.6% with no link to any demographic risk factor. Neither the simultaneous removal of third molar teeth nor genioplasty was found to be a risk factor for SSI. For literature comparison purposes, there is a clear need for the international guidelines defining SSI to be used.

Surgical Antibiotic Prophylaxis: Incidence and Risk of Surgical Site Infection

Introduction: This prospective cross sectional study assessed surgical antibiotic prophylaxis (SAP) practice, the incidence of surgical site infection (SSI) and its associated risks in Universiti Kebangsaan Malaysia Medical Centre. Methods: Patients for elective colorectal, hepatobiliary, upper gastrointestinal, breast and endocrine surgery, who received SAP were included and followed up until day-30 postoperatively. Types of antibiotic, preoperative–dose timing, intraoperative re-dosing and its duration were recorded. The incidence of SSI was calculated and its associated risks expressed in odds ratio. Results: Out of 166 patients recruited, 121 (72.89%) patients received SAP preoperatively, and 91 (75.21%) of them were prescribed the appropriate antibiotic as per our institutional guideline. Three patients who continued to receive therapeutic antibiotic postoperatively were excluded from statistical analysis. Eleven (9.10%) patients received SAP beyond the preoperative–dose timing of 60 minutes (p=0.001), which was an independent risk factor for SSI (adjusted OR 4.527, 95% CI; 1.058-19.367, p=0.042). The risk of SSI also remained in patients who continued to receive SAP beyond 24 hours (OR 4.667, 95% CI; 1.527-14.259, p=0.007). The overall rate of SSI was 17.18%. Conclusion: We found that the choice of antibiotic prescribed for SAP was in accordance to institutional guideline and the relatively high SSI incidence was similar to a recent local report. Although the number of patients receiving preoperative dose-timing of &gt; 60 minutes was low, it was nonetheless an independent risk factor for SSI. The postoperative continuation of SAP for more than 24 hours showed no benefit in reducing SSI.

Abdominal Cutaneous Thermography and Perfusion Mapping after Caesarean Section: A Scoping Review.

Introduction: Caesarean section (CS) is the most prevalent surgical procedure in women. The incidence of surgical site infection (SSI) after CS remains high but recent observations of CS wounds using infrared thermography has shown promise for the technique in SSI prognosis. Although thermography is recognised as a ‘surrogate’ of skin perfusion, little is known of the relationship between skin temperature and skin perfusion in the context of wound healing. Aim: To assess the extent of literature regarding the application of infrared thermography and mapping of abdominal cutaneous perfusion after CS. Methods: Wide eligibility criteria were used to capture all relevant studies of any design, published in English, and addressing thermal imaging or skin perfusion mapping of the abdominal wall. The CINAHL and MEDLINE databases were searched, with two independent reviewers screening the title and abstracts of all identified citations, followed by full-text screening of relevant studies. Data extraction from included studies was undertaken using a pre-specified data extraction chart. Data were tabulated and synthesised in narrative format. Results: From 83 citations identified, 18 studies were considered relevant. With three additional studies identified from the reference lists, 21 studies were screened via full text. None of the studies reported thermal imaging and cutaneous perfusion patterns of the anterior abdominal wall. However, two observational studies partially met the inclusion criteria. The first explored analysis methodologies to ‘interrogate’ the abdominal thermal map. A specific thermal signature (‘cold spots’) was identified as an early ‘flag’ for SSI risk. A second study, by the same authors, focusing on obesity (a known risk factor for SSI after CS) showed that a 1 °C lower abdominal skin temperature led to a 3-fold odds of SSI. Conclusion: There is a significant gap in knowledge on how to forewarn of wound complications after CS. By utilising the known association between skin temperature and blood flow, thermographic assessment of the wound and adjacent thermal territories has potential as a non-invasive, independent, imaging option with which to identify tissue ‘at risk’. By identifying skin ‘hot’ or ‘cold’ spots, commensurate with high or low blood flow regions, there is potential to shed light on the underlying mechanisms leading to infective and non-infective wound complications.

Controle glicêmico e suas evidências para prevenção de infecção de sítio cirúrgico em cirurgias de coluna

Objetivo: Analisar as evidências disponíveis na literatura sobre o controle glicêmico como medida de prevenção para a infecção de sítio cirúrgico (ISC) em cirurgias de coluna. Métodos: Revisão integrativa desenvolvida com a seleção de artigos primários nas bases de dados Medical Literature Analysis and Retrieval System on-line (MEDLINE), Biblioteca Virtual em Saúde (BVS) e no Portal de Periódicos da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) utilizando-se os descritores: Glycemic control, wound infection, spine, spine surgery, surgical site infection e hemoglobinaA1c. Resultados: Os resultados evidenciaram a hiperglicemia como fator de risco independente para ISC em pacientes submetidos a cirurgia de coluna. O nível de hemoglobina glicada foi associado à infecção de ISC sendo que o risco se torna maior à medida em que há aumento do nível de hemoglobina glicada. O Diabetes Mellitus foi apontado como preditor independente significativo para ISC. Considerações finais: A hiperglicemia perioperatória, independentemente da condição de Diabetes Mellitus, está relacionada a ocorrência de ISC. Observou-se a falta de parâmetros quanto o nível glicêmico ideal o que aponta a necessidade de novos estudos capazes de nortear essa lacuna.

Association Between Perioperative Hypothermia and Surgical Site Infection After Elective Abdominal Surgery: A Prospective Cohort Study.

IntroductionSurgical site infections (SSIs) account for 14-16% of nosocomial infections and are one of the major causes of increased morbidity, hospital stay, cost of care, and even mortality. Hypothermia as a risk factor for SSI is debated but there is lack of conclusive evidence. The present study explores the association of hypothermia with SSI.MethodologyThis is a prospective cohort study conducted on adult patients who underwent elective laparotomy. Patients were divided into two cohorts, the Hypothermia Cohort and the Normothermia Cohort, based upon episodes of hypothermia of <360C in the perioperative period. SSI was diagnosed based upon criteria defined by the Center for Disease Control and Prevention (CDC). Postoperative follow-up to detect SSI was done until 30 days after the operation.ResultsA total of 183 patients met the selection criteria and were included in the study. Ninety patients (49%) had perioperative hypothermia and were followed in the Hypothermia Cohort, while 93 patients (51%) who remained normothermic in the perioperative period were followed in the Normothermia Cohort. Mean age of the patients was 49.77 +/- 14.82 years. Almost two-thirds of the participants were females (63.9%). Patients who developed hypothermia were significantly older and had lower BMI. Also the proportion of female patients was significantly higher in the Normothermic Cohort.Rate of SSI was similar in both groups (10% versus 10.8%) with p-value of 0.867. Multivariable regression analysis also failed to show any significant association between hypothermia and SSI.ConclusionOur study failed to show any statistically significant association between hypothermia and surgical site infection.

Association between gastric Candida colonization and surgical site infections after high-level hepatobiliary pancreatic surgeries: the results of prospective observational study

AimHigh-level hepatobiliary pancreatic (HBP) surgeries are highly associated with surgical site infections (SSIs), in which microorganisms have a significant role. In the present study, we investigated whether gastric Candida colonization had a significant role in SSIs after high-level HBP surgeries.MethodsBetween May 2016 and February 2017, the 66 patients who underwent high-level HBP surgeries were enrolled in the present study. The gastric juice was prospectively collected through nasogastric tube after general anesthesia induction and was incubated onto the CHROMagar Candida plate for the cultivation of various Candida species. First of all, we compared the incidence of SSIs according to the presence or absence of Candida species in gastric juice. Secondly, we evaluated the variables contributing to the development of SSIs by multivariate analysis. The protocol was approved by the medical ethics committee of Mie University Hospital (No.2987).ResultsGastric Candida colonization was identified in 21 patients (group GC) and was not identified in the other 45 patients (group NGC). There were no differences in preoperative variables including compromised status, such as age, nutritional markers, complications of diabetes mellitus, and types of primary disease between the two groups. SSIs occurred in 57.1% (12/21) of group GC and in 17.8% (8/45) of group NGC, showing a significant difference (p = 0.001). Multivariate analysis revealed gastric Candida colonization as a significant risk factor of SSIs (OR 6.17, p = 0.002).ConclusionGastric Candida colonization, which is not a result of immunocompromised status, is highly associated with SSIs after high-level HBP surgeries.Trial registrationJapan Primary Registries Network; UMIN-CTR ID: UMIN000040486 (retrospectively registered on 22nd May, 2020).

Seasonal impact on surgical site infections in hip fracture surgery: Analysis of 330,803 cases using a nationwide inpatient database

As the aging population progresses, the number of elderly hip fracture patients is increasing. Elderly patients with hip fractures have a high risk of perioperative complications. One of the major complications after surgery is surgical site infection (SSI), which requires additional surgical interventions and is associated with increased mortality. Previous literature has shown that the risk of SSI is higher during the summer season in orthopedic surgery. However, little is known about the seasonal differences in the risk of SSI after hip fracture surgery. In this study, we aimed to identify the association between seasonality and SSI. We enrolled a total of 330,803 patients undergoing hip fracture surgery (65 years or older) using the Japanese Diagnosis Procedure Combination database. The study period was from April 1, 2011, to March 31, 2016. The data were analyzed to determine the association between seasonality and the incidence of SSI, debridement procedure. The primary outcome was the incidence of SSI and debridement. Other risk factors of SSI and debridement were investigated including seasons and confounders such as sex, age, BMI, smoking status, anticoagulant intake, comorbidities, surgical procedure based on medical diagnosis, waiting times for the surgery, and hospital surgical volume based on the previous literature, the risk of SSI and debridement. Hip fracture surgeries performed in summer showed the highest risk for SSI and debridement. The risk for SSI was significantly associated with spring, and summer compared to winter (odds ratio [OR], 1.18; p, 0.016; OR, 1.19; p, 0.012, respectively). The incidence of debridement procedures after the initial surgery was also associated with spring, summer, and fall: the risk was the highest in summer (OR, 1.34; p, <0.001). Obesity, smoking history, number of comorbidities, anticoagulant intake before surgery, longer waiting time for surgery, and small hospital surgical volume were significantly associated with the risk of SSI. We found a significant association between SSI after surgery for hip fractures and seasonality. Surgeries performed in summer had the highest risk for SSI and subsequent debridement procedures.

Does preoperative prognostic nutrition index predict surgical site infection after spine surgery?

Malnutrition is reported as one of the risk factors for surgical site infection (SSI). The prognostic nutritional index (PNI) is a simple method for nutritional evaluation. However, little is known about the relationship between SSI and the PNI in patients after spine surgery. We aimed to determine independent predictors of SSI after spine surgery. We analyzed 1115 patients who underwent spine surgery (369 males, 746 females, mean age 56years, follow-up period: at least 1year). Patients were divided into SSI and non-SSI groups. Preoperative risk factors, including PNI (10 × serum albumin [g/dL] + 0.005 × total lymphocyte count [/μL]), were assessed. Postoperatively, 43 patients (3.9%) experienced SSI. Univariate analysis showed that preoperative PNI (48.5 vs 51.7; p < 0.01), revision status (p < 0.05), male sex (p < 0.01), body mass index (BMI) (p < 0.05), and usage of anticoagulant agents (p < 0.05) differed significantly between the SSI and non-SSI groups. Multivariate logistic regression analysis showed that preoperative PNI (odds ratio [OR], 0.94; 95% confidence interval [CI]: 0.90-0.98; p < 0.01), male sex (OR, 2.64; 95% CI: 1.40-4.99; p < 0.01), length of surgery ≥ 180min (OR, 2.78; 95% CI: 1.30-5.96; p < 0.01), BMI ≥ 30kg/m2 (OR, 2.89; 95% CI: 1.20-6.97; p < 0.05), and revision status (OR, 2.30; 95% CI: 1.07-4.98; p < 0.05) were independently associated with SSI postoperatively. Lower preoperative PNI was found to be a risk factor for SSI after spine surgery. Patients with lower preoperative PNI values should be cautioned about the risk of SSI and provide adequate informed consent.

Surgical Site Infection: The Scourge of Abdominal Wall Reconstruction.

Background: Surgical site infection (SSI) is a well-recognized and potentially catastrophic complication of abdominal wall reconstruction (AWR). The authors present a review of the literature surrounding SSI in AWR, exploring prevention and treatment strategies as well as risk factors. Methods: A comprehensive review of the current literature was undertaken. Evidence was reviewed and summarized with particular focus on prevention and treatment strategies available to hernia surgeons. Results: Patient risk factors for SSI are well described in the literature and include obesity, smoking, and other comorbidities. Contaminated hernias and cases involving enterocutaneous fistulae are also at higher risk of SSI. Surgical decisions such as type of mesh, plane of mesh placement, and fascial release may all contribute to SSI risk. To treat established mesh infection, conservative management with antibiotic agents and negative pressure therapy is a reasonable option in some cases. Removal of prosthesis appears to provide favorable results, however, repeat surgery can be problematic Conclusions: Surgical site infection remains an important pathology in the world of AWR. Surgeons have a wealth of tools in their arsenal to prevent and treat SSI and should be aware of the emerging evidence in the fast-moving specialty of hernia surgery. Complex cases should be handled by surgeons and centers with expertise in treating such patients.

Liberal and Restrictive Blood Transfusion Strategies in Orthopedic Surgery: Risk Factors for Surgical Site Infection

Background: The identification of risk factors for infections in surgical patients with lower-limb fractures and blood transfusions has increased in recent years. Surgical site infections (SSIs) increase hospitalization, care costs, and patient suffering. Correction surgery for lower-limb fractures and blood transfusion is quite common between surgical procedures. The aim of this study was to describe the relationship between blood transfusion and SSI in patients undergoing orthopedic surgery on lower limbs. Methods: We conducted a prospective cohort study to identify risk factors for SSI in blood transfused patients undergoing fracture repair in lower-limb surgeries between February 2017 and May 2019 in 2 reference tertiary-care hospitals in Belo Horizonte, a city of 3 million people in Brazil. Data regarding patient characteristics, surgical procedures, blood transfusions, and surgical infections were collected. Patient characterization was performed by calculating the absolute and relative frequencies of categorical variables and calculating mean, median, minimum, maximum, standard deviation, and coefficient of variation for quantitative variables. The incidence of surgical site infection, the risk of postoperative hospital death, and the total length of hospital stay were calculated by point estimates and 95% confidence intervals identified by statistical tests of bilateral hypotheses, considering the level of significance of 5%. A multivariate analysis (logistic regression) was performed to identify SSI risk factors. Results: Patients who had an indication for blood transfusion (n = 38) but who did not receive blood (n = 4) had significantly lower hemoglobin, comparing discharge with admission, than the group who received blood. Intraoperative transfusion was a risk factor for SSI (OR, 4.7) (Fig. 1). Among the 205 patients with no indication for transfusion, 98 received blood even without the indication: there was no difference in hemoglobin outcome when discharge and admission were compared, and the 98 patients were exposed to unnecessary risk. Regarding restrictive versus liberal transfusion strategies, there were differences in the variables, age (P = .000), duration of surgery (P = .003), number of comorbidities (P = .000), body mass index (BMI) (P = .027), previous hemoglobin (P = .000), and high hemoglobin (P = .000), considering the transfusion practice employed (Fig. 2). Conclusions: The indications for and definition of protocols and careful evaluation of blood transfusion are critical to avoid infectious complications in orthopedic patients with lower-limb fractures.Funding: NoneDisclosures: None

Staphylococcal Decolonization to Prevent Surgical Site Infection: Is There a Role in colorectal surgery?

Background: Colorectal surgery is associated with a high risk of surgical site infections (SSIs), with an incidence ranging from 16.9% to 20%, and SSIs are associated with significant morbidity and mortality, prolonged length of hospitalization, and increased health care costs. Staphylococcal decolonization is an attempt to alter the microbiome to prevent staphylococcal and other skin flora from accessing the surgical site, and This practice effectively reduces SSIs in orthopedic, neurologic, and cardiac surgeries. A staphylococcal decolonization protocol was enacted in colorectal surgeries at our institution beginning in October 2016. We compared patient outcomes between patients who did and did not undergo preoperative staphylococcal decolonization. Methods: All patients undergoing nonemergent NHSN-defined colorectal procedures from July 2015 until June 2019 at a tertiary-care medical center were included in this retrospective study. Staphylococcal decolonization was performed using chlorhexidine 2% body wash solution, mupirocin nasal ointment, and chlorhexidine 0.12% oral rinse all twice daily for 5 days prior to surgery. All SSIs were defined by NSHN criteria. The primary outcome was SSI, and secondary outcomes were superficial wound infection (SIP) and organ-space infection (IAB). Predictive variables included decolonization status (yes or no), age, gender, body mass index, procedure duration, American Society of Anesthesiologists (ASA) score, diabetes, smoking, and surgical oncology service. Surgical antimicrobial prophylaxis with cefazolin and metronidazole OR cefoxitin, and chlorhexidine skin preparation were standard throughout the study period. Univariate analysis was performed using a χ2 or t test. Multivariable logistic regression was performed to control for all clinically important variables above. All statistical analyses were done using SAS version 9.4 software (Cary, NC). Results: In total, 1,139 patients underwent nonemergent colorectal surgery from July 2015 to June 2019. There were 74 SSIs: 42 IABs and 32 SIPs. Decolonization was performed in 332 of 1,139 cases (29%). There was no difference in overall SSIs between those decolonized and not decolonized (P = .50). However, SIPs were reduced in the group receiving decolonization: 1.2% (4 of 332) versus 3.5% (28 of 807) (P = .04. When controlling for known SSI risk factors, those not receiving decolonization remained at increased risk of SIPs (OR, 3.79; 95% CI, 1.14–12.61; P = .03. Conclusions: Staphylococcal decolonization may prevent a subset of SSIs in patients undergoing colorectal surgery.Funding: NoneDisclosures: Michelle Doll reports a research Grant from Molnlycke Healthcare.

Surgical Antibiotic Prophylaxis in Hysterectomy: Is Cefazolin Still the Best?

Background: Prior studies suggest that cefazolin, widely used for antibiotic prophylaxis in hysterectomy, might not prevent surgical site infections (SSIs) as well as antibiotics with a broader antianaerobic antimicrobial spectrum. We compared the effectiveness of cefazolin versus antibiotic regimens with a broader antimicrobial spectrum in a ≥500-bed regional referral center. Methods: Study design: retrospective cohort. Population and setting: patients ≥18 years old who underwent hysterectomy between 1998 and 2018 at the University of Wisconsin Hospital. Analysis: propensity score matching with a caliper of 0.2 to select controls for cefazolin treatment, matching on: age, body mass index (BMI), diabetes, length of stay, duration of surgery, and preoperative renal function. We conducted a crude SSI incidence analysis and adjusted for additional covariates (malignancy, intraoperative temperature, and preoperative glucose level) using a Cox proportional hazards model. All analyses were conducted using STATA SE v15 software. Results: We had 4,087 hysterectomy patients, with 123 SSIs (3%). Among these SSIs, 46%, 11%, and 42% were superficial, deep, and organ-space, respectively. Malignancies were present in 83% of SSI patients, with 30% being ovarian cancer. Risk factors for SSI in the unmatched sample multivariable analysis (MV) were length of stay (aHR, 1.1; 95% CI, 1.05–1.1; P &lt; .001), duration of surgery (aHR, 1.2; 95% CI, 1.1–1.32; P &lt; .001), and BMI (aHR, 1.04; 95% CI, 1.02–1.06; P &lt; .001). After propensity matching, 2,282 hysterectomies remained. In the crude incidence analysis, cefazolin (IR, 6.0) had a protective SSI effect compared to cefoxitin (IR, 7.1), ciprofloxacin/metronidazole (IR, 27.2), clindamycin/gentamicin (IR, 14.1), any antianaerobic regimen (IR, 8.0), and regimens not guideline recommended (IR, 11.7). In our MV analyses of cefazolin versus comparator antibiotic regimens, we found that hypothermia was consistently associated with a higher SSI risk (P ≤ .03). Receipt of a β-lactam antibiotic regimen was associated with a significantly lower SSI risk (aHR, 0.31; 95% CI, 0.11–0.89, P = .03), but cefazolin’s protective SSI effect was no longer statistically significant. Conclusions: We found that cefazolin had a lower SSI risk compared to other antibiotic regimens, including those with better antianaerobic spectrum, in our tertiary-care hospital’s 11-year high-risk cohort. Our analysis suggests that maintaining intraoperative normothermia and administering β-lactam antibiotic prophylaxis are important modifiable risk factors for SSI prevention.Funding: NoneDisclosures: None

Incidence and Risk Factors of Surgical Site Infection Following Pediatric Neurosurgery

Background: Neurosurgeries are at high risk of surgical site infections (SSI), a complication associated with increased morbidity, mortality, and cost. Our aim was to measure SSI incidence and risk factors following pediatric neurosurgery at CHU Sainte-Justine, the provincial center for pediatric craniofacial surgery in Québec, Canada. Methods: Retrospective cohort study of all patients with elective neurosurgery performed at CHUSJ between October 2014 and October 2018. Medical records were reviewed to compare demographics, clinical presentations, and outcomes of patients. SSIs occurring within 30 days of a procedure without implant and up to 90 days with implant, were identified. SSI incidence was measured in patient years, and risk factors were assessed using univariate logistic regressions. Results: In total, 379 patients were included with an overall SSI incidence of 3.96 patient years. We found a higher SSI incidence in 2014–2015 compared to 2016–2018 (1.82 vs 4.83 patient years). The median age was 3.90 years, and cases seemed younger than controls (1.45 vs 4.15 years). No difference between groups was found for sex, body mass index, prematurity, and length of hospitalization. The proportion of deep SSIs was greater than superficial SSIs (53.3% vs 46.7%). Cases were more likely to present with a more severe ASA score, previous history of neurosurgery, neurological conditions, and pulmonary conditions than controls: OR, 3.90 (95% CI, 1.36–11.49); OR, 2.59 (95% CI, 0.88–7.40); OR, 2.77 (95% CI, 0.98–8.41), and OR, 3.21 (95% CI, 0.86–9.94), respectively. Among patients with history of neurosurgery, a higher proportion of cases experienced a cerebrospinal fluid leak (28.6% vs 2.2%). Most patients (85.8%) received preoperative prophylactic antibiotic. Of those, 49.3% were considered appropriate based on antibiotic and timing of administration. When antibiotic dosage was also considered, the number of patients who received an appropriate antibiotic therapy decreased radically. Conclusions: Patients with comorbidities, especially neurological and pulmonary conditions, are at higher risk of SSI after neurosurgery. We are currently working on a detailed analysis to explain the increase in SSI incidence after 2016. Finally, prophylactic antibiotic therapy needs to be improved and its impact on SSI rates needs to be monitored.Funding: NoneDisclosures: None

Risk Factors for Surgical Site Infection After Orthopedic Trauma Surgery: A Two-Year Prospective Multicenter Analysis

Background: Trauma is defined by the NHSN as “blunt or penetrating traumatic injury.” Therefore, if the surgery was performed because of a recent fall, for example, then it is a trauma surgery. Here, we investigated which preoperative and operative parameters are associated with surgical site infection (SSI) after orthopedic trauma surgery. Objective: We aimed to answer 3 main questions: What is the risk of wound infection for patients undergoing trauma surgery? What are the main etiologic agents of SSI after trauma surgery? And what are the risk factors associated with SSI after trauma surgery? Methods: This prospective multicenter cohort study included 2,035 patients undergoing trauma surgery between July 2016 and June 2018 in 4 hospitals in Belo Horizonte, Brazil. Outcome variables were SSI, hospital mortality, and length of hospital stay. The following preoperative and operative parameters were evaluated: age, length of hospital stay before surgery, duration of surgery, number of professionals at surgery, number of hospital admissions, surgical wound classification, American Society of Anesthesiologists (ASA) preoperative assessment score, type of surgery (elective, emergency), general anesthesia (yes, no), trauma surgery (yes, no), and the 3-point prediction Nosocomial Infections Surveillance (NNIS) risk index. Results: The overall estimated SSI risk was 2.8% (95% CI, 2.0%–3.6%). Hospital mortality risk after trauma surgery was 3.4% (95% CI, 2.8%–4.4%). Hospital length of stay parameters in noninfected patients were as follows: mean, 8 days; median, 3 days; SD, 12 days. Hospital length of stay parameters in infected patients were mean, 30 days; median, 23 days; with SD, 31 days. The parameters for hospital stay in infected patients were mean, 10 days; median, 3 days, and SD, 15.9 (P &lt; .001). Trauma orthopedic surgery lasting &gt;2 hours was associated with approximately twice the risk (RR, 2.2) of developing an SSI compared to ≤2 hours of surgery: 27 of 739 (3.7%) versus 21 of 1,290 (1.6%), respectively, (P = .005) (Fig. 1). The NNIS risk index predicts the risk of SSI after trauma surgery (P = .003): 13 of 737 SSIs (1.8%) had an NNIS risk index of 0; 20 of 736 SSIs (2.7%) had an NNIS risk index of 1; 8 of 211 SSIs (3.8%) had an NNIS risk index of 2; and 2 of 11 SSIs (18.2%) had an NNIS risk index of 3 (Fig. 2). Conclusions: We identified intrinsic risk factors for SSI after orthopedic trauma surgery. The identification of the actual SSI incidence after trauma surgery in developing country hospitals and associated risk factors may support actions to minimize the complications caused by SSI.Funding: NoneDisclosures: None

Impact of oral antibiotic prophylaxis on surgical site infection after rectal surgery: results of randomized trial.

To evaluate the impact of oral antibiotic prophylaxis on surgical site infection (SSI) rate after rectal surgery. It was a single-center 1:1 randomized controlled open parallel trial (registration number NCT03436719). The patients undergoing rectal resection for benign and malignant tumors were assigned randomly to two groups: the oral plus intravenous (IV) antibiotic prophylaxis (AP) and the IV antibiotic prophylaxis only. The primary endpoint was the overall rate of SSI. Between November 2017 and December 2018, 116 (male-55, the mean age-64 years) patients were enrolled into the trial. Of them, 57 had oral erythromycin 500 mg + metronidazole 500 mg a day before surgery and 1,000 mg of cephalosporin IV 30-90 min before operation. In the other group, 59 patients had the same IV antibiotics only. The incidence of SSIs was 22% (13/59) and 3.5% (2/57) correspondingly (р = 0.002). The statistically significant difference was detected for superficial SSI 0 (0%) vs. 5 (8.5%) (p = 0.03) and organ/space SSI 2 (3.5%) vs. 9 (15.3%) (p = 0.03), respectively. A multivariate analysis of risk factors of SSI identified two independent ones: bacterial contamination of the pelvic cavity ≥ 105 CFU at the end of surgery OR 17.9, 95% CI 2.1-150.0 (p = 0.008) and oral antimicrobial prophylaxis OR 0.2, 95% CI 0.03-0.8 (p = 0.02). Oral-parenteral AP significantly reduced the risk of SSI following elective rectal surgery. Bacterial contamination of the pelvic cavity ≥ 105 CFU at the end of surgery and oral antimicrobial prophylaxis were independent risk factors of SSI.

Investigation of Variables Associated with Surgical Site Infection following the Management of Canine Cranial Cruciate Ligament Rupture with a Lateral Fabellotibial Suture.

This study investigated variables associated with surgical site infection (SSI) in dogs with cranial cruciate ligament rupture managed with stifle joint examination and lateral fabellotibial suture stabilization. A retrospective study of dogs that had stifle arthroscopy, stifle arthrotomy, or a combination of both, followed by lateral fabellotibial suture stabilization for cranial cruciate ligament rupture. All cases had a minimum follow-up of 90 days. Lameness grades were recorded preoperatively, and at 6-week and final follow-up. One hundred fifty procedures in 130 dogs met the inclusion criteria. Overall, SSI rate was 17.3% and removal of the lateral fabellotibial suture was performed in 53% of SSI. Multivariable analysis showed significant association between SSI and bodyweight (p = 0.013), and induction using propofol (p = 0.029). Multilevel ordinal logistic regression analysis showed a greater proportion of dogs had a higher lameness grade at 6-week (p = 0.021) and final follow-up (p = 0.002) assessments in the infected compared with non-infected dogs. Our study demonstrated a higher SSI incidence than previously reported in dogs undergoing a lateral fabellotibial suture for cranial cruciate ligament rupture. Bodyweight and induction with propofol were identified as significant risk factors for postoperative SSI. Owners could be advised of an increased SSI risk in larger dogs and consideration should be given to selection of induction agent. Dogs that develop an SSI have a worse lameness grade at 6-week and final follow-up.

Risk factors for surgical site infection after pancreatic surgery: a better postoperative antibiotic strategy is possible

Pancreatic surgery is associated with high morbidity, mainly due to infectious complications, so many centres use postoperative antibiotics (ATBpo) for all patients. However, antibiotic regimens vary according to local practices. The aims of this study were to describe the occurrence of surgical site infection (SSI) and ATBpo prescription after pancreatic surgery, and to determine the risk factors of postoperative SSI, in order to better define the clinical indications for ATBpo in this context. All patients undergoing scheduled major pancreatic surgery from January 2007 to November 2018 were included in this retrospective study. Patients were classified into four groups according to SSI and routine ATBpo prescription: SSI+/ATBpo+, SSI-/ATBpo+, SSI+/ATBpo- and SSI-/ATBpo-. In addition, risk factors (fever and pre-operative biliary prosthesis) associated with the occurrence of SSI and ATBpo were analysed using a logistic regression model. Data from 149 patients (115 pancreaticoduodenectomies and 34 splenopancreatectomies) were analysed. Thirty (20.1%) patients experienced SSI and 42 (28.2%) received ATBpo. No difference was found in routine ATBpo prescription between patients with and without SSI (26.7% vs 28.6%, respectively; P=0.9). Amongst the 107 patients who did not receive routine ATBpo, 85 (79.4%) did not develop an SSI. In-hospital mortality did not differ between infected and uninfected patients (7% vs 2%, respectively; P=0.13). The occurrence of postoperative fever differed between SSI+ and SSI- patients (73.3% vs 34.2%, respectively; P<0.001), while the prevalence of pre-operative biliary prosthesis was similar (37.9% vs 26.7%, respectively; P=0.3). Non-routine ATBpo after major pancreatic surgery resulted in 85 (56%) patients being spared unnecessary antibiotic treatment. This suggests that routine ATBpo prescription could be excessive, but further studies are needed to confirm such antibiotic stewardship. Fever appears to be a relevant clinical sign for individual-based prescription, but the presence of a biliary prosthesis does not.

Surgical site infection after liver transplantation in the era of multidrug-resistant bacteria: what new risks should be considered?

Surgical site infection (SSI) is a frequent infection site after liver transplantation (LT), and multidrug-resistant bacteria are common agents of those infections. This study aimed to analyze risk factors for SSI, including SSI caused by a multidrug-resistant microorganism (MDRO) after LT. We performed a cohort study of patients who underwent an LT from 2010 to 2018. The outcomes were SSI and SSI caused by MDRO. We analyzed features related to surgical procedure, patients' characteristics, and post-LT intercurrence. Surveillance for carbapenem-resistant Enterobacteriaceae (CRE), vancomycin-resistant Enterococcus (VRE), and carbapenem-resistant Acinetobacter baumannii (CRAB) was performed through rectal swab at the LT admission and weekly until hospital discharge during all study periods. SSI was identified in 30.1% (229/762) of LTs. We observed a decline in the SSI rate from 37.5% in 2014 to 16.7% in 2018 (P 0.02). SSI caused by MDRO occurred in 109 (14.3%) patients. Klebsiella pneumoniae was the most common agent of both SSI and SSI caused by MDRO. The pre-LT colonization was 98 (12.9%) by CRE, 73 (9.6%) by VRE, and 28 (3.7%) by CRAB. Risk factors for SSI caused by MDRO identified were dialysis after LT (P 0.01), CRAB acquisition before LT (0.03), and CRE acquisition before LT (P 0.004); use of adjusted prophylaxis by MDRO risk was the only protective factor identified (P 0.01). MDROs were frequent agents of SSI after LT, and the carbapenem-resistant Gram-negative colonization before LT increased the risk of SSI by these agents.

Clinico-statistical survey of oral antimicrobial prophylaxis and surgical site infection regarding ordinary tooth extraction and mandibular wisdom tooth extraction in the dental outpatient clinic

IntroductionWe investigated the use of oral antibiotics (OA) and surgical site infection (SSI) related to extractions of ordinary teeth and mandibular wisdom teeth in a dental outpatient clinic from January 2015 to December 2019. MethodsThe following information were surveyed: (1) presence/absence of OA, (2) timing, (3) type, (4) administration period, and (5) SSI rates. ResultsThe use of OA during ordinary tooth extraction decreased from 68.3% to 41.3%, but SSI rate did not change during this period of time. Total SSI rate was 0.8% (122/14,832) on average.For mandibular wisdom tooth extraction, preoperative administration of third-generation cephalosporins decreased from 70.4% to 0.3% while that of penicillin (AMPC) increased from 0% to 98%. SSI rate was not changed after these improvements. Total SSI rate was 3.5% (180/5106) on average. The duration of OA was slightly decreased to two days in 2018 and 2019, and it was found that there was no significant difference in SSI rates between 2- and 3-day durations. Preoperative administration had 0.37 odds ratio (OR) (95% confidence interval (95%CI): 0.22–0.63) of SSI compared with postoperative administration. AMPC had 0.76 OR (95% CI: 0.55–1.04) of SSI compared with Third-generation cephalosporins and others. Timing of OA was P < 0.01. ConclusionsSSI rates did not change over time, administration period of OA decreased and the use of AMPC increased. Therefore, it seems necessary to continue to investigate the effects of SSI risk factors proactively in the future and to make efforts in the advocacy of appropriate antimicrobial use.