Propensity Score-Weighted Analysis of Postoperative Infection in Patients With and Without Preoperative Urine Culture.

Importance: Although recent guidelines recommend against performance of preoperative urine culture before nongenitourinary surgery, many clinicians still order preoperative urine cultures and prescribe antibiotics for treatment of asymptomatic bacteriuria in an effort to reduce infection risk. Objective: To assess the association between preoperative urine culture testing and postoperative urinary tract infection (UTI) or surgical site infection (SSI), independent of baseline patient characteristics or type of surgery. Design, Setting, and Participants: This cohort study analyzed surgical procedures performed from January 1, 2017, to December 31, 2019, at any of 112 US Department of Veterans Affairs (VA) medical centers. The cohort comprised VA enrollees who underwent major elective noncardiac, nonurological operations. Machine learning and inverse probability of treatment weighting (IPTW) were used to balance the characteristics between those who did and did not undergo a urine culture. Data analyses were performed between January 2023 and January 2024. Exposures: Performance of urine culture within 30 days prior to surgery. Main Outcomes and Measures: The 2 main outcomes were UTI and SSI occurring within 30 days after surgery. Weighted logistic regression was used to estimate odds ratios (ORs) for postoperative infection based on treatment status. Results: A total of 250 389 VA enrollees who underwent 288 858 surgical procedures were included, with 88.9% (256 753) of surgical procedures received by males and 48.9% (141 340) received by patients 65 years or older. Baseline characteristics were well balanced among treatment groups after applying IPTW weights. Preoperative urine culture was performed for 10.5% of surgical procedures (30 384 of 288 858). The IPTW analysis found that preoperative urine culture was not associated with SSI (adjusted OR [AOR], 0.99; 95% CI, 0.90-1.10) or postoperative UTI (AOR, 1.18; 95% CI, 0.98-1.40). In analyses limited to orthopedic surgery and neurosurgery as a proxy for prosthetic implants, the adjusted risks for UTI and SSI were also not associated with preoperative urine culture performance. Conclusions and Relevance: This cohort study found no association between performance of a preoperative urine culture and lower risk of postoperative UTI or SSI. The results support the deimplementation of urine cultures and associated antibiotic treatment prior to surgery, even when using prosthetic implants.

Genetic and biologic risk factors associated with hernia formation: A review.

BACKGROUND: This systematic review aims to identify genetic and biologic markers associated with abdominal hernia formation. METHODS: Following PRIMSA-guidelines, we searched PubMed, MEDLINE, Embase, Scopus, and COCHRANE databases. RESULTS: Of 5946 studies, 65 were selected, excluding parastomal hernias due to insufficient data. For inguinal hernias, five studies unveiled 92 susceptible loci across 66 genes, predominantly linked to immune responses. Eleven studies observed elevated MMP-2 levels, with seven highlighting greater MMP-2 in direct compared to indirect inguinal hernias. One incisional hernia study identified unique gene-expression profiles in 174 genes associated with inflammation and cell-adhesion. In hiatal hernias, several genetic risk loci were identified. For all hernia categories, type I/III collagen ratios diminished. CONCLUSIONS: Biological markers in inguinal hernias appears consistent. Yet, the genetic predisposition in incisional hernias remains elusive. Further research to elucidate these genetic and biological intricacies can pave the way for more individualized patient care.

Practical Guide to Education Program Evaluation Research.

This Guide to Statistics and Methods describes common methods for building evidence of validity for a program within health professional education and provides a framework for program evaluation.

Six Long-Standing Questions about Antibiotic Prophylaxis in Surgery.

Surgical site infections (SSIs) are the most common adverse event occurring in surgical patients. Optimal prevention of SSIs requires the bundled integration of a variety of measures before, during, and after surgery. Surgical antibiotic prophylaxis (SAP) is an effective measure for preventing SSIs. It aims to counteract the inevitable introduction of bacteria that colonize skin or mucosa into the surgical site during the intervention. This document aims to guide surgeons in appropriate administration of SAP by addressing six key questions. The expert panel identifies a list of principles in response to these questions that every surgeon around the world should always respect in administering SAP.

Estimated Risk of Adverse Surgical Outcomes Among Patients With Recent COVID-19 Infection Using Target Trial Emulation Methods.

This cohort study emulates a trial within a large national veteran population to assess the risk of adverse postoperative outcomes among patients with recent COVID-19 infection.

Practical Guide to Ethical Considerations in Clinical Trials in Surgery.

This Guide to Statistics and Methods provides an overview of current ethical considerations and standards for clinical research.

Practical Guide to Statistical Considerations in Clinical Trials in Surgery.

This Guide to Statistics and Methods discusses key statistical considerations in the conduct of randomized clinical trials in surgery.

Association Between Postoperative Complications and Long-term Survival After Non-cardiac Surgery Among Veterans.

OBJECTIVE: To evaluate the relationship between postoperative complications and long-term survival. SUMMARY AND BACKGROUND: Postoperative complications remain a significant driver of healthcare costs and are associated with increased perioperative mortality, yet the extent to which they are associated with long-term survival is unclear. METHODS: National cohort study of Veterans who underwent non-cardiac surgery using data from the Veterans Affairs Surgical Quality Improvement Program (2011-2016). Patients were classified as having undergone outpatient, low-risk inpatient, or high-risk inpatient surgery. Patients were categorized based on number and type of complications. The association between the number of complications (or the specific type of complication) and risk of death was evaluated using multivariable Cox regression with robust standard errors using a 90-day survival landmark. RESULTS: Among 699,002 patients, complication rates were 3.0%, 6.1%, and 18.3% for outpatient, low-risk inpatient, and high-risk inpatient surgery, respectively. There was a dose-response relationship between an increasing number of complications and overall risk of death in all operative settings [outpatient surgery: no complications (ref); one-hazard ratio (HR) 1.30 (1.23 - 1.38); multiple-HR 1.61 (1.46 - 1.78); low-risk inpatient surgery: one-HR 1.34 (1.26 - 1.41); multiple-HR 1.69 (1.55 - 1.85); high-risk inpatient surgery: one-HR 1.14 (1.10 - 1.18); multiple-HR 1.42 (1.36 - 1.48)]. All complication types were associated with risk of death in at least 1 operative setting, and pulmonary complications, sepsis, and clostridium difficile colitis were associated with higher risk of death across all settings. Conclusions: Postoperative complications have an adverse impact on patients' long-term survival beyond the immediate postoperative period. Although most research and quality improvement initiatives primarily focus on the perioperative impact of complications, these data suggest they also have important longer-term implications that merit further investigation.

Expert Consensus for Key Features of Operative Reports of Ventral Hernia.

BACKGROUND: Operative reports are important documents; however, standards for critical elements of operative reports are general and often vague. Hernia surgery is one of the most common procedures performed by general surgeons, so the aim of this project was to develop a Delphi consensus on critical elements of a ventral hernia repair operative report. STUDY DESIGN: The Delphi method was used to establish consensus on key features of operative reports for ventral hernia repair. An expert panel was selected and questionnaires were distributed. The first round of voting was open-ended to allow participants to recommend what details should be included. For the second round the questionnaire was distributed with the items that did not have unanimous responses along with free text comments from the first round. RESULTS: Eighteen surgeons were approached, of which 11 completed both rounds. Twenty items were on the initial questionnaire, of which 11 had 100% agreement. Of the remaining 9 items, after the second questionnaire an additional 7 reached consensus. CONCLUSION: Ventral hernia repairs are a common and challenging problem and often require reoperations. Surgeons frequently refer to previous operative notes to guide future procedures, which requires detailed and comprehensive operative reports. This Delphi consensus was able to identify key components needed for an operative report describing ventral hernia repair.

Practical Guide to Design Choice of Randomized Clinical Trials in Surgery.

This Guide to Statistics and Methods provides an overview of the strengths and weaknesses of several randomized clinical trial design options.

Risk factors for adverse outcomes in emergency versus nonemergency open umbilical hernia repair and opportunities for elective repair in a national cohort of patients with cirrhosis.

BACKGROUND: Whether to perform umbilical hernia repair in patients with cirrhosis is a common dilemma for surgeons. We aimed to determine the incidence, morbidity, and mortality associated with emergency and nonemergency umbilical hernia repair in patients with and without cirrhosis, and to explore opportunities for nonemergency repair. METHODS: Veterans diagnosed with cirrhosis between 2001 and 2014 and a frequency-matched sample of veterans without cirrhosis were followed through September 2017. Veterans Affairs Surgical Quality Improvement Program data provided outcomes and risk factors for mortality after umbilical hernia repair. We performed chart review of a random sample of patients undergoing emergency umbilical hernia repair. RESULTS: Among 119,605 veterans with cirrhosis and 118,125 matched veterans without cirrhosis, the Veterans Affairs Surgical Quality Improvement Program database included 1,475 and 552 open umbilical hernia repairs, respectively. In patients with cirrhosis, 30-day mortality was 1.2% after nonemergency umbilical hernia repair and 12.2% after emergency umbilical hernia repair, contrasting with zero deaths in patients without cirrhosis undergoing these repairs. In patients with cirrhosis but no ascites in the prior month, 30-day mortality after nonemergency umbilical hernia repair was 0.7%, compared to 2.2% in those with ascites. Chart review of patients requiring emergency umbilical hernia repair revealed that elective umbilical hernia repair may have been feasible in 30% of these patients in the prior year; fewer than half of those undergoing emergency umbilical hernia repair had received a general surgery consultation in the prior 2 years. CONCLUSIONS: Nonemergency open umbilical hernia repair was associated with relatively low perioperative mortality in patients with cirrhosis and no recent ascites. About 30% of patients undergoing emergency umbilical hernia repair may have been candidates for nonemergency repair in the prior year.

Events, care, and outcomes after hernia mesh explantation for infection.

BACKGROUND: Mesh explantation for infection after hernia surgery sets a cascade of events that has not been previously described. The purpose of this study is to review the care of these patients and outcomes. METHODS: We obtained data on all Veterans Health Administration enrollees undergoing hernia repair during 2008-2015. All mesh explantation cases were identified and manually reviewed through December 2020 to identify surgical site occurrences, re-repairs, and subsequent explantations. RESULTS: We identified 332 index explantations due to infection. A first subsequent repair was performed in 82.5% (274/332); a second repair in 18.2% (50/274); a third repair in 16.0% (8/50); and a fourth repair in 25% (2/8). Overall recurrence rate over a 12 year-period was 160/332 (48.1%). CONCLUSIONS: Mesh explantation due to infection sets a cascade of complications and hernia recurrences necessitating re-operation. Complications resulting from mesh explantation suggest that resolution of the initial abdominal wall infection is crucial to prevent future mesh infections.

Risk of Hernia Mesh Explantation following Early Versus Late Onset Skin and Soft Tissue Infection.

To estimate the relative risk of explantation in patients with skin and soft tissue infection onset within 90 days of hernia surgery, compared with days 91-365 and after 1 year. BACKGROUND: Infectious complications occurring after hernia repair with synthetic mesh require prolonged treatment, and eventual mesh explantation. Little is known whether early versus late onset infection is associated with differential risk of mesh removal, and whether treatment with long-term antibiotics or debridement are associated with mesh salvage. METHODS: This was a retrospective observational cohort study. We obtained data on all inguinal, umbilical, and ventral hernia repairs with implanted synthetic mesh performed in Veterans Affairs hospitals during 2008-2015. Participants without a 5-year infection after hernia surgery were excluded. Logistic regression estimated the association of mesh explantation with exposure to mesh-related infection during postoperative days 0-90, versus days 91-365 versus after 1 year. Additional covariates included any subsequent abdominal operation, antibiotic administration, and incision and drainage (I&D) or debridement procedures. RESULTS: One thousand eight hundred eighty-five patients underwent index hernia repair and developed a skin and soft tissue infection within 5 years. Infection onset during days 91-365 was associated with increased explantation risk (OR, 1.62; 95% CI, 1.04-2.48), as was increased antibiotic use (OR, 1.04; 95% CI, 1.03-1.05) and surgical treatments (OR, 3.74; 95% CI, 3.02-4.67). Subsequent abdominal operation was associated with lower explantation risk (OR, 0.46; 95% CI, 0.33-0.61). CONCLUSIONS: Early infections may be more suitable for conservative management. Later-onset infections have lower probability of mesh salvage and should be considered for earlier explantation to save the patients prolonged courses of antibiotics and surgical interventions.

Re-Infection after Explantation of Infected Hernia Mesh: Are the Same Micro-Organisms Involved?

Background: It is unclear if a history of mesh explantation for infection is predictive of future microbiology after subsequent hernia operations. We investigated how often the same causative organism is cultured in the initial explantation and subsequent repairs. Patients and Methods: We obtained data on patients undergoing ventral/incisional, umbilical, and inguinal hernia repairs from the Veterans Affairs Surgical Quality Improvement Program during 2008-2015. Manual review was performed for all patients with an administrative code indicative of mesh explantation and those with explantation for infection were retained. We then obtained data on cultured organisms from the mesh site at the time of index explantation and at any re-repair or subsequent explantation during a follow-up period ending in December 2020. Results: We identified 332 patients undergoing mesh explantation because of infection (64.8% ventral, 18.7% umbilical, 16.6% inguinal). Mean age was 60.3 years (standard deviation [SD], 9.7) and 93.9% were male. The same organism was cultured at re-infection in 23 of 59 (39%) cases. Gram-positive micro-organisms were the most prevalent in 20 of 23 (87%). Among the gram-positive, Staphylococcus aureus was the most common pathogen and was cultured in 18 of 20 (90%) cases, of which 14 of 18 (77.8%) were methicillin-susceptible Staphylococcus aureus (MSSA) and 4 of 18 (22.2%) were methicillin-resistant Staphylococcus aureus (MRSA). Three of 23 (13%) gram-negative organisms were the same at both re-infection and index explantation consisting of Escherichia coli in 2 of 3 (66.7%), and Pseudomonas aeruginosa in one of three (33.3%). Conclusions: Identification of organisms at time of prosthetic infection is helpful not only in treating the initial infection, but also in prevention of infection with the same organisms after subsequent repairs. Same organism re-infection should not be underestimated, particularly when Staphylococcus aureus is isolated.

Psychosocial Determinants of Readmission After Surgery.

BACKGROUND: Quality of life and psychosocial determinants of health, such as health literacy and social support, are associated with increased health care utilization and adverse outcomes in medical populations. However, the effect on surgical health care utilization is less understood. OBJECTIVE: We sought to examine the effect of patient-reported quality of life and psychosocial determinants of health on unplanned hospital readmissions in a surgical population. RESEARCH DESIGN: This is a prospective cohort study using patient interviews at the time of hospital discharge from a Veterans Affairs hospital. SUBJECTS: We include Veterans undergoing elective inpatient general, vascular, or thoracic surgery (August 1, 2015-June 30, 2017). MEASURES: We assessed unplanned readmission to any medical facility within 30 days of hospital discharge. RESULTS: A total of 736 patients completed the 30-day postoperative follow-up, and 16.3% experienced readmission. Lower patient-reported physical and mental health, inadequate health literacy, and discharge home with help after surgery or to a skilled nursing or rehabilitation facility were associated with an increased incidence of readmission. Classification regression identified the patient-reported Veterans Short Form 12 (SF12) Mental Component Score <31 as the most important psychosocial determinant of readmission after surgery. CONCLUSIONS: Mental health concerns, inadequate health literacy, and lower social support after hospital discharge are significant predictors of increased unplanned readmissions after major general, vascular, or thoracic surgery. These elements should be incorporated into routinely collected electronic health record data. Also, discharge plans should accommodate varying levels of health literacy and consider how the patient's mental health and social support needs will affect recovery.