Major Surgery Research Articles

Treatment Failure After Repair of Displaced Femoral Neck Fractures in Patients Compared by "Decade of Life": An Analysis of 565 Cases in Adults Less Than 60 years of Age.

To study the results of displaced femoral neck fractures (FNFs) in adults less than 60 years of age by comparing patients, injury, treatment, and the characteristics of treatment failure specifically according to patients' age at injury, that is, by their "decade of life" [ie, "under 30" (29 years and younger), "the 30s" (30-39 years), "the 40s" (40-49 years), and "the 50s" (50-59 years)]. Multicenter retrospective comparative cohort series. Twenty-six North American Level 1 Trauma Centers. Skeletally mature patients aged 18-59 years with operative repair of displaced FNFs. Main outcome measures were treatment failures (fixation failure and/or nonunion, osteonecrosis, malunion, and the need for subsequent major reconstructive surgery (arthroplasty or proximal femoral osteotomy). These were compared across decades of adult life through middle age (<30 years, 30-39 years, 40-49 years, and 50-59 years). Overall, treatment failure was observed in 264 of 565 (47%) of all hips. The mean age was 42.2 years, 35.8% of patients were women, and the mean Pauwels angle was 53.8 degrees. Complications and the need for major secondary surgeries increased with each increasing decade of life assessed: 36% of failure occurred in patients <30 years of age, 40% in their 30s, 48% in their 40s, and 57% in their 50s (P < 0.001). Rates of osteonecrosis increased with decades of life (under 30s and 30s vs. 40s vs. 50s developed osteonecrosis in 10%, 10%, 20%, and 27% of hips, P < 0.001), while fixation failure and/or nonunion only increased by decade of life to a level of trend (P = 0.06). Reparative methods varied widely between decade-long age groups, including reduction type (open vs. closed, P < 0.001), reduction quality (P = 0.030), and construct type (cannulated screws vs. fixed angle devices, P = 0.024), while some variables evaluated did not change with age group. Displaced FNFs in young and middle-aged adults are a challenging clinical problem with a high rate of treatment failure. Major complications and the need for complex reconstructive surgery increased greatly by decade of life with the patients in their sixth decade experiencing osteonecrosis at the highest rate seen among patients in the decades studied. Interestingly, treatments provided to patients in their 50s were notably different than those provided to younger patient groups. Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Identifying risk factors for postoperative ileus following open abdominal aortic aneurysm repair

BackgroundPostoperative ileus (POI) is a common complication following major abdominal surgery. The majority of the data available regarding POI after abdominal surgery is from the gastrointestinal and urological literature. These data have been extrapolated to vascular surgery, especially with regard to enhanced recovery programs for open abdominal aortic aneurysm (AAA) surgery. However, vascular patients are a unique patient population and extrapolation of gastrointestinal and urological data may not necessarily be appropriate. Therefore, the purpose of this study was to delineate the prevalence and risk factors of POI in patients undergoing open AAA surgery. MethodsThis was a retrospective, single-institution study of patients who underwent open AAA surgery from January 2016 to July 2023. Patients were excluded if they had undergone nonelective repairs or had expired within 72 hours of their index operation. The primary outcome was rates of POI, which was defined as the presence of two or more of the following after the third postoperative day: nausea and/or vomiting, inability to tolerate oral food intake, absence of flatus, abdominal distension, or radiological evidence of ileus. ResultsA total of 123 patients met study criteria with an overall POI rate of 8.9% (n = 11). Patients who developed a POI had a significantly lower body mass index (24.3 kg/m2 vs 27.1 kg/m2; P = .003), were more likely to undergo a transperitoneal approach (81.8% vs 42.0%; P = .022), midline laparotomy (81.8% vs 37.5%; P = .008), longer total clamp times (151.6 minutes vs 97.7 minutes; P = .018), greater amounts of intraoperative crystalloid infusion (3495 mL vs 2628 mL; P = .029), and were more likely to return to the operating room (27.3% vs 3.6%; P = .016). Proximal clamp site was not associated with POI (P=.463). Patients with POI also had higher rates of postoperative vasopressor use (100% vs 61.1%; P = .014) and greater amounts of oral morphine equivalents in the first 3 postoperative days (488.0 ± 216.0 mg vs 203.8 ± 29.6 mg; P = .016). Patients who developed POI had longer lengths of stay (12.5 days vs 7.6 days; P < .001), a longer duration of nasogastric tube decompression (5.9 days vs 2.2 days; P < .001), and a longer period of time before diet tolerance (9.1 days vs 3.7 days; P < .001). Of those who developed a POI (n = 11), four (36.4%) required total parental nutrition during the admission. ConclusionsPOI is a morbid complication among patients undergoing elective open AAA surgery that prolongs hospital stay. Patients at risk for developing a POI are those with a lower body mass index, as well as those who had an operative repair via a transperitoneal approach, midline laparotomy, longer clamp times, larger amounts of intraoperative crystalloid infusion, a return to the operating room, postoperative vasopressor use, and higher amounts of oral morphine equivalents. These data highlight important perioperative opportunities to decrease the prevalence of POI.

The Effectiveness of Virtual and Augmented Reality in Surgical Pain Management: A Systematic Review of Randomized Controlled Trials.

Satisfactory management of postoperative pain remains challenging. Nonpharmacological modalities such as virtual and augmented reality (VR/AR) offer potential benefits and are becoming increasingly popular. This systematic review evaluates the effectiveness and safety of VR/AR interventions on postoperative pain and recovery. MEDLINE, Embase, CINAHL, Web of Science, and CENTRAL databases were searched from inception to July 27, 2023, for randomized controlled trials (RCTs), published in English, evaluating the use of VR/AR interventions for surgical pain relief. Study selection and data extraction were performed by pairs of reviewers independently and in duplicate, and potential risk of bias was determined using the Risk of Bias-version 2 (RoB 2) tool. Our outcomes included pain relief, reduction of anxiety, satisfaction, and adverse effects. Due to substantial heterogeneity, a narrative synthesis without meta-analysis was performed. We included 35 trials among 2257 citations, categorized as surgery (n = 12), minor procedures (n = 15), and postoperative physiotherapy (n = 8). Surgical group included various surgeries, with 11 using immersive VR predominantly in the postoperative period, and most reporting no differences in pain, but potential for reduced anxiety and sedation requirements. In the minor procedures group, most studies reported decreased pain and anxiety during the procedural performance. Two studies reported increased heart rate, while 2 others reported better hemodynamic stability. Home-based AR physiotherapy achieved (n = 6) similar pain and functional outcomes after knee replacement, with 1 large study (n = 306) reporting reduction of mean costs by $2745 for provision of 12 weeks physiotherapy. There were some concerns around potential bias for most studies, as the nature of interventions make it challenging to blind assessors and participants. No important adverse effects were noted using VR/AR technology. Evidence from RCTs indicates that the use of immersive VR during minor procedures may reduce procedural pain, decrease anxiety, and improve satisfaction. However, small studies, inconsistent effect, and variation in the application of interventions are important limitations. Evidence to support the application of AR/VR for major surgeries is limited and needs to be further investigated. Use of home-based physiotherapy with AR likely has economic advantages, and facilitates virtual care for appropriate patients who can access and use the technology safely.

Process and outcome differences in the care of patients undergoing elective and emergency right hemicolectomy.

Up to 30% of patients with colorectal cancer present as an emergency and have worse outcomes than elective patients. Compared with left-sided cancers, malignancies arising in the right colon are significantly under-researched. We sought to compare cancer care quality and clinical outcomes between emergency and elective presentations of right-sided colon cancer (RCC). This multicentre, retrospective study included all patients who underwent operative management for a RCC, from 1 April 2017 to 31 March 2022. Data were collected from electronic patient records, and host and tumour factors as well as outcomes between emergency and elective cohorts were compared. Overall, 806 patients (median age 72 years) were included. Some 175 patients (22%) presented as an emergency: 140 in obstruction and 35 with tumour perforation, compared with 1 patient with tumour perforation in the elective group (p < 0.001). The emergency group had higher rates of postoperative complications (59.1% vs 20.0%, p < 0.001), increased 90-day mortality (13.7% vs 1.3%, p < 0.001) and a longer hospital stay (5 vs 10 days, p < 0.001). From the emergency cohort only 29.2% of eligible patients received adjuvant chemotherapy and in multivariate regression analysis emergency presentation was associated with a decreased likelihood of receiving adjuvant chemotherapy (odds ratio 0.26 [0.14-0.47], p < 0.001). Both short- and long-term outcomes after emergency presentation of RCC are poor, with inadequate access to subsequent chemotherapy. Strategies addressing emergency presentations of left-sided tumours have moved towards temporisation and elective surgery. Delaying major resectional surgery for optimisation may improve outcomes and access to adjuvant therapies for RCC.

Evaluation of Latrogenic Genitourinary Fistula after Major Gynaecological Operation in Patient Group Admitted in BSMMU

Introduction: Close proximity of urinary tract and genital systems in females poses potential risk of fistulas formation during surgical interventions. Gynaecological malignancy, bleeding, prolonged surgery, the presence of active infection during operation, endometriosis, large uterus, previous pelvic operation, pelvic adhesions and myoma uteri are major predisposing factors that may increase the risk of urological injuries &amp; genitourinary fistulas. Genitourinary fistulas result in continuous or intermittent urinary incontinence and a significant public health issue with negative physical, emotional and social impacts on individuals. Materials and Methods: This cross sectional observational study was conducted in Department of Obstetrics &amp;Gynaecology, Bangabandhu Sheikh Mujib Medical University, Dhaka, from 27th March 2017 to 26th September 2017. The sample was collected by purposive sampling technique. The study subjects were women with iatrogenic fistula (diagnosed after a clinical examination and investigations) attended in out-patients or in-patients department. Result: Mean age of patients was 32.5 ± 9.54 years. Vesicovaginal fistula was commonest cause for iatrogenic genitourinary fistula, present in 34 patients. Ureterovaginal fistula was 10 patients and 6 patients detected urethrovaginal. Aetiological factors revealed that, 46.0% occurred during vaginal hysterectomy, 18.0% due to abdominal hysterectomy, 20.0% due to laparotomy with salphingoophorectmy and 16.0% during laparotomy with cystectomy. Conclusion: The commonest urogenital fistula is the vesicovaginal fistula. Urinary leakage following gynaecological surgery is a dreaded complication due to the formation of urogenital fistula. Thorough evaluation, using all diagnostic tools for complete diagnosis, understanding the pathophysiology and choosing the best surgical procedure are mandatory to obtain good outcomes after the surgical procedures. Medicine Today 2024, Vol.36 (2): 110-113

A Systematic Review and Meta-Analysis of MicroRNA as Predictive Biomarkers of Acute Kidney Injury.

Acute kidney injury (AKI) affects 10-15% of hospitalised patients and arises after severe infections, major surgeries, or exposure to nephrotoxic drugs. AKI diagnosis based on creatinine level changes lacks specificity and may be delayed. MicroRNAs are short non-coding RNA secreted by all cells. This review of studies measuring miRNAs in AKI aimed to verify miRNAs as diagnostic markers. The study included data from patients diagnosed with AKI due to sepsis, ischaemia, nephrotoxins, radiocontrast, shock, trauma, and cardiopulmonary bypass. Out of 71 studies, the majority focused on AKI in sepsis patients, followed by cardiac surgery patients, ICU patients, and individuals receiving nephrotoxic agents or experiencing ischaemia. Studies that used untargeted assays found 856 differentially regulated miRNAs, although none of these were confirmed by more than one study. Moreover, 68 studies measured miRNAs by qRT-PCR, and 2 studies reported downregulation of miR-495-3p and miR-370-3p in AKI patients with sepsis after the AKI diagnosis. In three studies, upregulation of miR-21 was reported at the time of the AKI diagnosis with a significant pooled effect of 0.56. MiR-21 was also measured 19-24 h after cardiac surgery in three studies. However, the pooled effect was not significant. Despite the considerable research into miRNA in AKI, there is a knowledge gap in their applicability as diagnostic markers of AKI in humans.

Integrated Multi-Omics Analysis of Cerebrospinal Fluid in Postoperative Delirium.

Preoperative risk biomarkers for delirium may aid in identifying high-risk patients and developing intervention therapies, which would minimize the health and economic burden of postoperative delirium. Previous studies have typically used single omics approaches to identify such biomarkers. Preoperative cerebrospinal fluid (CSF) from the Healthier Postoperative Recovery study of adults ≥ 63 years old undergoing elective major orthopedic surgery was used in a matched pair delirium case-no delirium control design. We performed metabolomics and lipidomics, which were combined with our previously reported proteomics results on the same samples. Differential expression, clustering, classification, and systems biology analyses were applied to individual and combined omics datasets. Probabilistic graph models were used to identify an integrated multi-omics interaction network, which included clusters of heterogeneous omics interactions among lipids, metabolites, and proteins. The combined multi-omics signature of 25 molecules attained an AUC of 0.96 [95% CI: 0.85-1.00], showing improvement over individual omics-based classification. We conclude that multi-omics integration of preoperative CSF identifies potential risk markers for delirium and generates new insights into the complex pathways associated with delirium. With future validation, this hypotheses-generating study may serve to build robust biomarkers for delirium and improve our understanding of its pathophysiology.

Predictors of Mortality Following Mitral Valve Replacement: A SystematicReview

Introduction: Valvular heart diseases are some of the most common causes of cardiovascular morbidity and mortality worldwide. The mitral valve is estimated to be the cause of 15% of deaths in heart valve disease. Mitral valve dysfunction can be treated with a variety of operative options, one of whichis mitral valve replacement. Although it is less desirable than repair, in some situations, it is the only viable option. Thus, we conducted this systematic review to help guide future risk assessment for mitral valve replacement patients and help in the construction of pre-operative risk assessment tools. Methods: This is a systematic review of original articles discussing the topic of predictors of mortality for patients undergoing mitral valve replacement surgery. A systematic search was conducted via independent researchers across a number of databases, starting with PubMed databases utilizing its MeSH database, followed by a complementary search through Google Scholar. Results: In total, 27 original articles were included in a collective cohort of 145005 patients. Older age was the most commonly cited variable as a mortality predictor, followed by decreased left ventricular ejection fraction. EuroSCORE is a well-known scoring system that predicts in-hospital mortality following major cardiac surgeries. It was found that it overestimated mortality greatly, while another study found that the revised EuroSCORE II system was a better predictor of mortality. Overall, we note that both versions usually overestimate mortality. Conclusion: There seems to be an overall agreement over several factors, including older age, decreased ejection fraction, and the expertise of the surgeon and the institution on being clear predictors of postoperative mortality. There is also an obvious need for new tools to better predict mortality rates preoperatively, as the currently used scores often result in greatly inaccurate predictions

Machine learning-based prediction of off-pump coronary artery bypass grafting-associated acute kidney injury.

The cardiac surgery-associated acute kidney injury (CSA-AKI) occurs in up to 1 out of 3 patients. Off-pump coronary artery bypass grafting (OPCABG) is one of the major cardiac surgeries leading to CSA-AKI. Early identification and timely intervention are of clinical significance for CSA-AKI. In this study, we aimed to establish a prediction model of off-pump coronary artery bypass grafting-associated acute kidney injury (OPCABG-AKI) after surgery based on machine learning methods. The preoperative and intraoperative data of 1,041 patients who underwent OPCABG in Chest Hospital, Tianjin University from June 1, 2021 to April 30, 2023 were retrospectively collected. The definition of OPCABG-AKI was based on the 2012 Kidney Disease Improving Global Outcomes (KDIGO) criteria. The baseline data and intraoperative time series data were included in the dataset, which were preprocessed separately. A total of eight machine learning models were constructed based on the baseline data: logistic regression (LR), gradient-boosting decision tree (GBDT), eXtreme gradient boosting (XGBoost), adaptive boosting (AdaBoost), random forest (RF), support vector machine (SVM), k-nearest neighbor (KNN), and decision tree (DT). The intraoperative time series data were extracted using a long short-term memory (LSTM) deep learning model. The baseline data and intraoperative features were then integrated through transfer learning and fused into each of the eight machine learning models for training. Based on the calculation of accuracy and area under the curve (AUC) of the prediction model, the best model was selected to establish the final OPCABG-AKI risk prediction model. The importance of features was calculated and ranked by DT model, to identify the main risk factors. Among 701 patients included in the study, 73 patients (10.4%) developed OPCABG-AKI. The GBDT model was shown to have the best predictions, both based on baseline data only (AUC =0.739, accuracy: 0.943) as well as based on baseline and intraoperative datasets (AUC =0.861, accuracy: 0.936). The ranking of importance of features of the GBDT model showed that use of insulin aspart was the most important predictor of OPCABG-AKI, followed by use of acarbose, spironolactone, alfentanil, dezocine, levosimendan, clindamycin, history of myocardial infarction, and gender. A GBDT-based model showed excellent performance for the prediction of OPCABG-AKI. The fusion of preoperative and intraoperative data can improve the accuracy of predicting OPCABG-AKI.

Hospital and Patient Characteristics Associated with Neonatal Blood Stream Infection in Inpatient Care: Insights from the 2019 HCUP KID Database.

This study explores the associations between pediatric adverse events (PAEs) and both hospital and patient characteristics within the inpatient hospital setting, specifically focusing on Neonatal Blood Stream Infection (NBSI) as defined by pediatric quality indicators (PDIs) from the Agency for Healthcare Research and Quality (AHRQ). This research aims to answer questions regarding the relationship between hospital characteristics and patient demographics with the occurrence of NBSI. This study utilized discharge data from the Healthcare Cost and Utilization Project (HCUP) Kids' Inpatient Databases (KID) for the year 2019. Bivariate and multivariate logistic regression models were employed to analyze patient-level encounters of NBSIs. The analysis examined various factors including hospital size, location, and teaching status, as well as patient-specific variables such as gender, age, race, service lines, payment sources, and major operating room procedures. The results indicate that Public and Private not-for-profit hospitals showed significantly lower odds of experiencing NBSIs when compared to Private investor-owned hospitals, as did smaller, rural, and nonteaching hospitals when compared to large hospitals. Additionally, individual factors such as gender, age, race, service lines, payment sources, and types of major operating room procedures were found to have varying levels of significance in relation to NBSI. This study provides important insights into PAEs within the inpatient hospital setting, particularly focusing on NBSIs within the PDI framework. The findings highlight critical areas for the development of evidence-based interventions and guidelines, which are essential for clinicians and policymakers. Ultimately, this study contributes to the understanding and improvement of pediatric patient safety by emphasizing the necessity for targeted strategies to mitigate the risk of NBSI.

Decoding behaviour change techniques in opioid deprescribing strategies following major surgery: a systematic review of interventions to reduce postoperative opioid use

Background and objectivesMethodsA structured search strategy encompassing databases including MEDLINE, Embase, CINAHL Plus, PsycINFO and Cochrane Library was implemented from inception to October 2023. Included studies focused on interventions targeting...

Virtual multimodal hub for patients undergoing major gastrointestinal cancer surgery (PRIORITY-CONNECT 2 Pilot) - A pilot randomised type I hybrid effectiveness-implementation trial

BackgroundThe PRIORITY-CONNECT 2 pilot trial will establish the feasibility and acceptability of a virtual multimodal programme following gastrointestinal cancer surgery. The secondary aims are to obtain pilot data on the likely difference in key outcomes, data elements that will guide future implementation studies, and to identify barriers and facilitators that inform the development and execution of a substantive randomised clinical effectiveness trial of teleprehabilitation/rehabilitation. MethodsThis is a multicentre, assessor-blinded, pilot, randomised controlled trial utilising a Hybrid Type I effectiveness-implementation design. 20 participants undergoing major gastrointestinal cancer surgery will be randomised (1:1 allocation) to attend a virtual multimodal prehabilitation-rehabilitation hub (intervention group), delivered before (1–6 weeks) and after (up to 3 months) surgery plus usual care, or to usual care alone (control group). An individualised intervention will be delivered by an experienced multidisciplinary team including a physiotherapist, psychologist, dietitian, nurse, social worker, and a geriatrician. Outcomes will be collected at baseline, 1–2 days before surgery, during the hospital stay, day of discharge from hospital, and 3 months postoperatively. The primary outcomes will be feasibility and acceptability of the virtual multimodal hub. Secondary outcomes assess the rate of postoperative complications within 30 days after surgery, quality of life, the number of days at home within 30 and 90 days after surgery, healthcare use, and implementation outcomes. DiscussionThe PRIORITY-CONNECT 2 pilot trial will generate findings about the feasibility and acceptability of delivering an evidence-based virtual multimodal preoperative (prehabilitation) and postoperative (rehabilitation) intervention targeting patients having major gastrointestinal cancer surgery. Trial registrationThis trial was registered prospectively with the National Library of Medicine ClinicalTrials.gov Registry (NCT06212700) on 8th January 2024.

The association of chronic obstructive pulmonary disease and 30-day outcomes of infrainguinal bypass surgery: A propensity-score matching study.

Infrainguinal bypass surgery is an effective treatment for peripheral artery disease (PAD). While chronic obstructive pulmonary disease (COPD) has been linked to heightened risks of mortality and morbidity in major surgery, a thorough investigation into COPD's impact on infrainguinal bypass outcomes remained underexplored. Thus, this study aimed to assess the 30-day outcomes for COPD patients undergoing infrainguinal bypass surgery. COPD and non-COPD patients who underwent infrainguinal bypass were identified in American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database from 2011 to 2022. Patients of age<18 were excluded. A 1:1 propensity-score matching was used to match demographics, baseline characteristics, symptomatology, procedure, conduit, and anesthesia. Thirty postoperative outcomes were compared. There were 3,183 (12.64%) and 22,004 (87.36%) patients with and without COPD, respectively, who underwent infrainguinal bypass. COPD patients had a higher comorbid burden. After propensity-score matching, COPD patients had higher sepsis (3.55% vs 2.42%, p = 0.01), wound complications (18.94% vs 16.40%, p = 0.01), and 30-day readmission (18.00% vs 14.92%, p < 0.01). However, COPD and non-COPD patients had comparable 30-day mortality (2.54% vs 2.67%, p = 0.81), and organ system complications including cardiac (3.58% vs 3.99%, p = 0.43), pulmonary (3.96% vs 3.20%, p = 0.12), and renal complications (1.70% vs 1.82%, p = 0.78). Limb-specific outcomes including major amputation (2.95% vs 2.50%, p = 0.30), untreated loss of patency (1.85% vs 1.38%, p = 0.16), and patent graft (98.24% vs 98.65%, p = 0.27) were also comparable between the cohorts. While COPD might be associated with the development of PAD due to potentially shared pathophysiology, it may not be an independent risk factor for the major 30-day outcomes in infrainguinal bypass surgery.

Study on the Identification of Unfair Competition in the Acquisition of Business Data

In the era of the digital economy, competition among operators has expanded to include competition for business data, and Unfair competition cases have sprung up around the acquisition of business data by major internet operators. In current judicial practice, referees often cite existing provisions such as the “General provisions” and “Internet specific provisions” of the anti-unfair competition law to determine the illegality and legitimacy of commercial data Unfair competition. And in the determination of such acts, there are some problems, such as the conflict between “Rights and interests protection” and “Behavior legitimacy”, the definition of data rights and interests tends to protect the interests of operators, and the judgment of legality boundary of data acquisition behavior is fuzzy. Therefore, it is suggested to correct the way of identifying the commercial data acquisition behavior, return to the nature of competition, and establish the behavior regulation paradigm. Changing the division of data ownership, confirming the portability of personal data, expanding the reasonable limit of data portability while playing the function of public-private synergy. To refine the judgment standard of justifiability of behavior, it is necessary to establish the behavior paradigm of “Reasonable legal interest test”, and to explore the rules of fact identification and cognizance of Data Acquisition Technology, in order to achieve the existing rules under the commercial data acquisition pattern of behavior identification optimization.

Anticipated Morbidities Assessed by NSQIP Surgical Risk Calculator in Patients with Pneumoperitoneum Undergoing Laparotomy

Background: The American College of Surgery National Surgical Quality Improvement Program (NSQIP) calculator is a tool to assess the risk stratification of a patient undergoing major surgical procedures. We used this calculator to assess morbidities in patients with pneumoperitoneum. Method: A prospective study of patients with pneumoperitoneum undergoing exploratory laparotomy was conducted in the General Surgery Department, Liaquat National Hospital. Surgical risks were calculated preoperatively and were compared with the actual outcomes. Results: The NSQIP surgical risk calculator calculated morbidities in comparison with actual morbidities, which were surgical site infection in 28 (17.8%) vs. 49 (31.2%) patients, urinary tract infection in 26 (16.6%) vs. 4 (2.5%), pneumonia in 28 (17.8%) vs. 24 (15.3%) and cardiac event in 25 (15.9%) vs. 14 (8.9%). Conclusion: The NSQIP surgical risk calculator adequately anticipated morbidities such as SSI, UTI, pneumonia, and cardiac events in comparison with actual morbidities.

The impact of an enhanced recovery after surgery protocol for major head and neck oncologic surgery on postoperative complications and adjuvant treatment delivery.

The Commission on Cancer (CoC) recently introduced a quality metric to optimize time between major head and neck surgery and adjuvant treatment (TAT) ≤6 weeks, as TAT delay adversely impacts patient survival. This study evaluates whether enhanced recovery after surgery (ERAS) for this population reduces the rate of postoperative complications, length of stay (LOS), and TAT. Patients undergoing larynx or oral cavity resection with free flap reconstruction, ERAS, and adjuvant treatment after 2018 were compared to a historical pre-ERAS cohort. Patients underwent surgery at a single-institution tertiary referral center for complex head and neck oncology. Differences between groups were compared by chi-square, Fisher's exact, or Wilcoxon rank-sum test. TAT >6 weeks was evaluated with univariate and multivariable logistic regression. Thirty-nine pre-ERAS patients were compared to 39 ERAS patients. No demographic differences existed between groups. LOS was improved with ERAS (p = 0.005). ERAS patients were discharged to home and returned to their activities of daily living (ADL) earlier (p = 0.004, 0.001). ADL recovery was associated with on-time TAT ≤42 days on univariate analysis (OR 1.36, 95% CI 1.13-1.63, p = 0.001). TAT delay was less frequent with ERAS (51.3% vs. 69.2%), but this was not significant after multivariable logistic regression (p = 0.11). ERAS decreases LOS and returns advanced head and neck cancer patients to their ADL sooner. Postoperative ADL recovery independently predicts on-time adjuvant treatment. Still, compliance beyond 50% with the TAT ≤6 weeks CoC quality metric remains a major treatment barrier.

Comparative Rates of Stroke and Rehospitalization of Atrial Fibrillation in Patients with Perioperative Atrial Fibrillation Following Major Emergency Abdominal Surgery and Patients with Non-perioperative Atrial Fibrillation.

Major emergency abdominal surgery is associated with postoperative complications and high mortality. Long-term outcomes in patients with perioperative atrial fibrillation (POAF) have recently received increased attention, especially POAF in non-thoracic surgery. This study aimed to compare long-term AF related hospitalization and stroke in patients with POAF in relation to major emergency abdominal surgery and in patients with non-perioperative AF. We crosslinked data from Danish nationwide registries and identified all patients who underwent major emergency abdominal surgery (2000-2018) and were diagnosed with POAF, and patients who developed AF in a non-perioperative setting. Patients with POAF were matched in a 1:5 ratio on age, sex, year of AF diagnosis and oral anticoagulation (OAC) status at the beginning of follow-up with patients with non-perioperative AF. From discharge, we examined adjusted hazard ratios (HR) of stroke using multivariable Cox regression analysis. The study population comprised 1,041 (out of 42,021 who underwent major emergency abdominal surgery) patients with POAF and 5,205 patients with non-perioperative AF. The median age was 78 years [interquartile range: 71-84] for those initiated on OAC therapy and 78 years [interquartile range: 71-85] for those not initiated on OAC therapy. During the first year of follow up, POAF was associated with similar rates of stroke as non-perioperative AF (patients initiated on OAC: HR 0.96 (95% confidence interval (CI) 0.52-1.77) and patients not initiated on OAC: HR 0.69 (95% CI 0.41-1.15). POAF in relation to major emergency abdominal surgery was associated with similar rates of stroke as non-perioperative AF. These results suggest that POAF not only carry an acute burden but also a long-term burden in patients undergoing major emergency abdominal surgery.

Persistent Practices? Understanding Continuity and Change in SRSGs’ Leadership of UN Peace Operations*

ABSTRACT In UN peace operations, the special representatives (SRSGs) as heads of mission take on a range of complex, sometimes unfathomable, tasks. This article addresses the question of how individuals influence UN peace operations by focusing on SRSGs who served as heads of two major peace operations and who carried their pre-SRSG experience into their first tenure as SRSG and their experience from that tenure into their second tenure. Thus, the aim is to understand how professional experience influences continuity and change in SRSGs’ leadership practices when leading peace operations. The analysis is grounded in an interview-based approach and informed by a practice-centered approach. The case studies examined here are Alan C. Doss, who served as SRSG of UNMIL and MONUC, and Ellen M. Løj, who served as SRSG of UNMIL and UNMISS. The identified practices of both SRSGs show that certain areas were particularly influenced by experiences from their career paths: (1) mission administration, (2) working with the mission leadership team, (3) interacting with host-state actors, and (4) interactions with UN headquarters. Tracing how practices have been pursued in different contexts provides insights into the influence of individual experiences on UN peace operations and the dynamics of practice internalization.

Restrictive versus Decision Support Guided Fluid Therapy during Major Hepatic Resection Surgery: A Randomized Controlled Trial.

Fluid therapy during major hepatic resection aims at minimizing fluids during the dissection phase to reduce central venous pressure, retrograde liver blood flow, and venous bleeding. This strategy, however, may lead to hyperlactatemia. The Acumen assisted fluid management system uses novel decision support software, the algorithm of which helps clinicians optimize fluid therapy. The study tested the hypothesis that using this decision support system could decrease arterial lactate at the end of major hepatic resection when compared to a more restrictive fluid strategy. This two-arm, prospective, randomized controlled, assessor- and patient-blinded superiority study included consecutive patients undergoing major liver surgery equipped with an arterial catheter linked to an uncalibrated stroke volume monitor. In the decision support group, fluid therapy was guided throughout the entire procedure using the assisted fluid management software. In the restrictive fluid group, clinicians were recommended to restrict fluid infusion to 1 to 2 ml · kg-1 · h-1 until the completion of hepatectomy. They then administered fluids based on advanced hemodynamic variables. Noradrenaline was titrated in all patients to maintain a mean arterial pressure greater than 65 mmHg. The primary outcome was arterial lactate level upon completion of surgery (i.e., skin closure). A total of 90 patients were enrolled over a 7-month period. The primary outcome was lower in the decision support group than in the restrictive group (median [quartile 1 to quartile 3], 2.5 [1.9 to 3.7] mmol · l-1vs. 4.6 [3.1 to 5.4] mmol · l-1; median difference, -2.1; 95% CI, -2.7 to -1.2; P < 0.001). Among secondary exploratory outcomes, there was no difference in blood loss (median [quartile 1 to quartile 3], 450 [300 to 600] ml vs. 500 [300 to 800] ml; P = 0.727), although central venous pressure was higher in the decision support group (mean ± SD of 7.7 ± 2.0 mmHg vs. 6.6 ± 1.1 mmHg; P < 0.002). Patients managed using a clinical decision support system to guide fluid administration during major hepatic resection had a lower arterial lactate concentration at the end of surgery when compared to a more restrictive fluid strategy. Future trials are necessary to make conclusive recommendations that will change clinical practice.

Methodological quality of research on perioperative immunomodulatory supplementation in oncological gastrointestinal tract surgery: a meta-research protocol

IntroductionOne of the topics that show differences of opinion in the scientific field of nutrition is the recommendation by clinical practice guidelines (CPGs) of an immunomodulatory diet with arginine, nucleotides...