Random forest modeling using socioeconomic distress predicts hernia repair approach.

BACKGROUND: Surgical techniques for abdominal wall hernia repair have advanced, yet it is unclear if all patient populations experience these innovations equally. We hypothesized that in patients undergoing abdominal wall herniorrhaphy, there would be socioeconomic variation between robotic, laparoscopic, and open approaches. METHODS: We performed a retrospective review of patients undergoing abdominal wall herniorrhaphy at a tertiary care center from 2013 through 2019. Patients were stratified by approach: laparoscopic (LH), open (OH), or robotic (RH). Insurance type was categorized as private, Medicare, or Medicaid/uninsured. Using zip code data, we obtained a Distressed Communities Index (DCI), which is comprised of 7 unique socioeconomic variables. We employed random forest (RF) modeling to predict surgical approach and determined each factor's variable importance (VI) for our model. RESULTS: There were 559 patients; 39.7% (n = 222) LH, 33.3% (n = 186) OH, and 27% (n = 151) RH. The DCI (p < 0.01) and rates of poverty (p = 0.01), adults without diplomas (p < 0.01), and unemployment (p < 0.01) were highest in the OH group while job growth (p = 0.02) and median income ratio (p < .01) were highest in the RH group. The LH group had a greater proportion of privately insured patients than Medicaid/ uninsured patients (43.4% vs 15.9%, p < 0.01). The most important variables identified by our RF model were job growth (for RH), insurance type (for LH), and no high school diploma (for OH). CONCLUSION: Insurance type, job growth, and educational attainment may influence operative approach and can contribute to the existing disparities in hernia surgery. Surgeons should address these inequalities and commit to parity in the delivery of surgical care.

Decreasing Postoperative Opioid Prescribing through Education.

OBJECTIVES: To study how an educational intervention given to surgical residents affected postoperative opioid prescribing. To determine whether decreased opioid prescription amounts increased patients' rate of refills, emergency department visits, or readmissions. DESIGN: Prospective sequential cohort study. SETTING: Level 1 tertiary care center in Savannah, Georgia. PARTICIPANTS: Opioid-naive patients who underwent general surgery (appendectomy, cholecystectomy, colectomy, hernia repair, lumpectomy, and mastectomy) between November 2017 and February 2018. RESULTS: Over a 6 month period, morphine milligram equivalents (MME) prescribed after general surgery per patient was decreased by 21.8% on average, with the largest reductions seen after breast and gallbladder surgeries (38% and 25% respectively). Patients who underwent laparoscopic surgery were prescribed 18.3% fewer MME. There was no significant change in MME prescribed after open abdominal surgery. Smaller prescription amounts were not associated with an increased rate of opioid refills. There was no increase in pain-related calls to clinic offices, emergency department visits, or readmissions for pain. CONCLUSION: After a single education intervention given to surgical residents, MME prescribed after common general surgeries can be decreased significantly without increasing rates of refills or utilization of care.

USMLE Scores and Clinical Rotation Role in Predicting ABSITE Performance Among Surgery Interns.

BACKGROUND: The American Board of Surgery In-training Examination (ABSITE) is an important marker of medical knowledge. It is unclear what factors predict or improve these scores. We evaluated demographics, United States Medical Licensing Examination (USMLE) step 1 and 2 scores, and surgical rotations during the intern year to determine if there were any correlations with the ABSITE performance. METHODS: This was a multicenter retrospective review during a 6-y period, investigating the correlation and association of demographics, USMLE scores, and types of rotations on the ABSITE percentile score of interns. Demographics included age, gender, race/ethnicity, U.S. versus international/foreign medical graduate for stratified analyses. Descriptive analysis was performed with ANOVA, correlation was evaluated with 95% confidence interval, and significance was defined as P < 0.05. RESULTS: Complete records obtained on 89 interns from six different general surgery programs over 6 y revealed that there was a significant correlation between USMLE 1 and 2 with the ABSITE. USMLE 2 correlation was the strongest (r = 0.44, 95% confidence interval = [0.25-0.60], P < 0.05). There was a significant difference in ABSITE performance (mean score difference of 17.3 percentile, P = 0.01) of interns who had an intensive care unit rotation before examination. Other surgical rotations were not associated with an ABSITE difference. Demographic factors such as age, gender, race/ethnicity, or medical graduate background status were not associated with ABSITE scores. CONCLUSIONS: USMLE step 2 scores had a higher correlation with intern ABSITE performance. An intensive care unit rotation before taking the ABSITE was associated with a significant difference in their percentile scores. Demographic factors were not correlated with ABSITE performance.

The Spectrum of Large Adrenal Masses: A Case Series.

Background: Adrenocortical carcinoma (ACC) is a rare malignancy that is challenging to diagnose and has important implications for surgeons who approach this disease. Despite its rarity, it must always be in the differential diagnosis when investigating and treating large adrenal masses. We aim to demonstrate the complexities of this disease through a review of five recent patients at a single tertiary care center. Methods: A series of five patients are described, each of whom presented to a single institution as referrals for "large adrenal mass" in the past sixteen months. Their pre-operative diagnosis, radiographic findings, the operative approach and the pathology results were examined. Results: The first patient had a 12 cm high grade adrenocortical carcinoma. The second patient had pathology consistent with a 9 cm, high grade ACC. The third had a liposarcoma. The fourth patient had a myelolipoma. The fifth was diagnosed with a benign process. Conclusion: Although adrenocortical carcinoma is an uncommon cancer, it has significant implications for the patient's prognosis and ultimately, their treatment algorithm. Therefore, when evaluating large adrenal masses, surgeons must remain vigilant of the possibility of adrenocortical carcinoma.

Large mediastinal haematoma after paraoesophageal hernia repair.

Mediastinal haematoma is a rare complication of laparoscopic paraoesophageal hernia repair with few documented cases in the current literature. Presentation of this unique clinical problem can range from extrinsic oesophageal obstruction to life-hreatening cardiac tamponade and therefore, warrants further discussion of at-risk population aetiology, diagnosis and successful management strategies. We present the case of a 71-year-old woman who underwent laparoscopic paraoesophageal hernia repair with nissen fundoplication complicated by severe dysphagia on postoperative day 12. Further evaluation with oesophagram and CT imaging revealed a large mediastinal haematoma with near obstruction of the distal oesophagus. This was managed successfully with laparoscopic transhiatal washout and drainage.

Can fatigue affect acquisition of new surgical skills? A prospective trial of pre- and post-call general surgery residents using the da Vinci surgical skills simulator.

OBJECTIVE: To study the effects of fatigue on general surgery residents' performance on the da Vinci Skills Simulator (dVSS). METHODS: 15 General Surgery residents from various postgraduate training years (PGY2, PGY3, PGY4, and PGY5) performed 5 simulation tasks on the dVSS as recommended by the Robotic Training Network (RTN). The General Surgery residents had no prior experience with the dVSS. Participants were assigned to either the Pre-call group or Post-call group based on call schedule. As a measure of subjective fatigue, residents were given the Epworth Sleepiness Scale (ESS) prior to their dVSS testing. The dVSS MScore™ software recorded various metrics (Objective Structured Assessment of Technical Skills, OSATS) that were used to evaluate the performance of each resident to compare the robotic simulation proficiency between the Pre-call and Post-call groups. RESULTS: Six general surgery residents were stratified into the Pre-call group and nine into the Post-call group. These residents were also stratified into Fatigued (10) or Nonfatigued (5) groups, as determined by their reported ESS scores. A statistically significant difference was found between the Pre-call and Post-call reported sleep hours (p = 0.036). There was no statistically significant difference between the Pre-call and Post-call groups or between the Fatigued and Nonfatigued groups in time to complete exercise, number of attempts, and high MScore™ score. CONCLUSION: Despite variation in fatigue levels, there was no effect on the acquisition of robotic simulator skills.

The Interventional Arm of the Flexibility In Duty-Hour Requirements for Surgical Trainees Trial: First-Year Data Show Superior Quality In-Training Initiative Outcomes.

PURPOSE: With the implementation of strict 80-hour work week in general surgery training, serious questions have been raised concerning the quality of surgical education and the ability of newly trained general surgeons to independently operate. Programs that were randomized to the interventional arm of the Flexibility In duty-hour Requirements for Surgical Trainees (FIRST) Trial were able to decrease transitions and allow for better continuity by virtue of less constraints on duty-hour rules. Using National Surgical Quality Improvement Program Quality In-Training Initiative data along with duty-hour violations compared with old rules, it was hypothesized that quality of care would be improved and outcomes would be equivalent or better than the traditional duty-hour rules. It was also hypothesized that resident perception of compliance with duty hour would not change with implementation of new regulations based on FIRST trial. METHODS: Flexible work hours were implemented on July 1, 2014. National Surgical Quality Improvement Program Quality In-Training Initiative information was reviewed from July 2014 to January 2015. Patient risk factors and outcomes were compared between institutional resident cases and the national cohort for comparison. Residents' duty-hour logs and violations during this period were compared to the 6-month period before the implementation of the FIRST trial. The annual Accreditation Council for Graduate Medical Education resident survey was used to assess the residents' perception of compliance with duty hours. RESULTS: With respect to the postoperative complications, the only statistically significant measures were higher prevalence of pneumonia (3.4% vs. 1.5%, p < 0.05) and lower prevalence of sepsis (0% vs. 1.5%, p < 0.05) among cases covered by residents with flexible duty hours. All other measures of postoperative surgical complications showed no difference. The total number of duty-hour violations decreased from 54 to 16. Had the institution not been part of the interventional arm of the FIRST trial, this number would have increased to 238. The residents' perception of compliance with 80-hour work week from the Accreditation Council for Graduate Medical Education survey improved from 68% to 91%. CONCLUSIONS: Residents with flexible work hours on the interventional arm of the FIRST trial at our institution took care of a significantly sicker cohort of patients as compared with the national dataset with equivalent outcomes. Flexible duty-hour policy under the FIRST trial has enabled the residents to have fewer work-hour violations while improving continuity of care to the patients. Additionally, the overall perception of resident compliance with the duty-hour requirements was improved.

Recombinant HE4 protein promotes proliferation of pancreatic and endometrial cancer cell lines.

Pancreatic adenocarcinoma is one of the most deadly malignancies, and endometrial cancer represents the most common gynecologic cancer in the USA. Better understanding on the pathologic mechanisms and pathways is required for effective treatment of these malignancies. Recently, human epididymis protein 4 (HE4 or WFDC2), a secretory glycoprotein, was found to be overexpressed in pancreatic and endometrial cancers. In addition, studies have shown that HE4 overexpression in endometrial cancer cell lines led to faster cancer progression in a mouse subcutaneous model. These findings raise a question on the role(s) of secretory, extracellular HE4 in cancer development. In the present study, we found that treatment of pancreatic and endometrial cancer cell lines with purified, extracellular HE4 protein led to a significant increase in cell viability and proliferation. Moreover, extracellular HE4 protein was able to increase DNA synthesis, and modulate the mRNA and protein levels of cell cycle marker PCNA and cell cycle inhibitor p21. These effects appeared to be robust and sustainable and required a relatively low concentration of HE4 protein. The findings indicated the secreted, extracellular HE4 may carry some physiopathological functions. Via paracrine/endocrine actions, circulatory HE4 produced by malignant cells may contribute to pancreatic and endometrial cancer progression and/or metastasis.

Geographic disparities in pancreatic cancer survival in a southeastern safety-net academic medical center.

OBJECTIVE: To quantify the effects of race, measures of socioeconomic status and geographic residency status on pancreatic cancer survival time. DESIGN: Retrospective review. SETTING: A southeastern safety-net academic medical centre in the United States. PARTICIPANTS: The study population consisted of all patients who were diagnosed, referred to or treated at the medical centre between 2009 and 2012 (n = 245). To ensure completeness and accuracy of the data, follow-up treatment and survival information about the cases were collected from the Georgia Comprehensive Cancer Registry in 2013. MAIN OUTCOME MEASURES: The odds of receiving first-course treatment (surgery, radiation or chemotherapy) and overall survival following a pancreatic cancer diagnosis. RESULTS: There were no observed differences in receipt of initial treatment; however, patients from low socioeconomic and rural areas had significant increase in risk of death compared to patients from affluent and urban areas. CONCLUSIONS: Results from this single site study suggests the significance of factors other than treatment differences that contribute to geographic disparities in mortality.

Promoter Hypermethylation and Decreased Expression of Syncytin-1 in Pancreatic Adenocarcinomas.

Syncytin-1 is a member of human endogenous retroviral W gene family (HERVW1). Known to be expressed in human placental trophoblast, syncytin-1 protein mediates the fusion of cytotrophoblasts for the formation of syncytiotrophoblasts, the terminally differentiated form of trophoblast lineage. In addition, in vitro studies indicate that syncytin-1 possessed nonfusogenic functions such as those for immune suppression, cell cycle regulation and anti-apoptotic activities. Overexpression of syncytin-1 has been observed in various malignant tissues including breast, endometrial and ovarian cancers. It was reported that syncytin-1 gene expression is associated with dynamic changes of DNA hypomethylation in the 5' LTR. In this study, applying the real-time PCR, Western blot analysis and immunohistochemistry methods, we demonstrate a constitutive expression of syncytin-1 in normal pancreas tissues as well as normal tissues adjacent to cancer lesions. Moreover, a reduced expression is found in the pancreatic adenocarcinoma tissues. The expression levels of syncytin-1 are not correlated with the stage, historical grade and gender, but inversely correlated with patients' age. Furthermore, COBRA and bisulfite sequencing results indicated that the lower expression of syncytin-1 is correlated with the hypermethylation of two CpG dinucleotides in the 5' LTR of syncytin-1 gene. The nonfusogenic function of syncytin-1 in normal pancreas as well as its role(s) in the pathogenesis and progression of pancreatic cancers remains to be investigated. Identification of the two CpG dinucleotides around transcription start site as key epigenetic elements has provided valuable information for further studies on the epigenetic regulation of syncytin-1 in pancreatic cancer cells.

Expression and diagnostic value of HE4 in pancreatic adenocarcinoma.

Human epididymis protein 4 (HE4) is a recognized biomarker in ovarian and endometrial cancer and over-expressed in pancreatic adenocarcinoma. The diagnostic value of HE4 in pancreatic adenocarcinoma remains unknown. Here we elucidate mRNA, protein and serum level of HE4 in pancreatic adenocarcinoma. HE4 mRNA level in tumor adjacent tissues and pancreatic adenocarcinoma tissues were tested by real time-PCR. Tissue microarray containing normal, adenocarcinoma, and adjacent pancreatic tissue was tested by immunohistochemistry (IHC). Serum level of HE4, carbohydrate antigen 19-9 (CA19-9), carbohydrate antigen 15-3 (CA15-3) and carbohydrate antigen 125 (CA125) were detected by ELISA assay in control and tumor patients. Further we compared the sensitivity and specificity of determining HE4, CA19-9, CA15-3, and CA125 for diagnosis of pancreatic adenocarcinoma and assessed the complementary diagnostic value of HE4, CA19-9, CA15-3 and CA125. Real time PCR showed significantly increased HE4 mRNA level in pancreatic adenocarcinoma compared with control. Result of IHC showed that HE4 significantly higher expressed in the human pancreatic carcinoma tissues than in both normal and adjacent non-tumorous pancreatic tissues, and the staining intensity is inversely correlated with the clinical stage. HE4 was highly expressed in early stage of pancreatic adenocarcinoma. Serum HE4 level is higher in cases with pancreatic adenocarcinoma than in the controls. Serum HE4 levels could research to a sensitivity of 45.83% and specificity of 93.75% when the Cutoff was set at 4.59 ng/mL. The Combined HE4 and CA19-9 increased the sensitivity to 83.33%; and interestingly, the combination of HE4 with CA15-3 led to the most powerful sensitivity of 87.5%. Combined with CA19-9 and CA15-3, HE4 could be a potential biomarker to improve the diagnostic power for pancreatic adenocarcinoma.

Jump starting a quality and performance improvement initiative to meet the updated ACGME guidelines.

BACKGROUND: The Accreditation Council for Graduate Medical Education requires residents to be trained in practice-based learning and improvement as well as systems-based practice. In an effort to establish a formal curriculum for graduate medical education, a Performance Improvement (PI) Training Program was initiated at Memorial University Medical Center. Training for the chief residents across all residency programs focused on the basic Six Sigma framework. Chief residents chose faculty sponsors and were also mentored by Six Sigma-trained staff. Faculty and physicians who participated in the initiative received PI/Continuing Medical Education credit. METHODS: A total of 17 presurveys and postsurveys were completed on 7 outcome measures. Nonparametric Wilcoxon signed rank 2-tailed tests were performed to test for significant change from presurvey to postsurvey. RESULTS: Analysis of the 2-year data (2009-2011) found statistically significant improvement for all 7 outcome measures. The surgical residents' PI Project for 2011 included the development of the Venous Thromboembolism Reassessment Tool. The project included a multidisciplinary team to develop a computer prompt that continued to trigger if the physician launched the prophylaxis or treatment form without ordering anticoagulation. The new prompt resulted in a 391% increase in anticoagulant orders. CONCLUSIONS: This study demonstrated that the resident-based PI Training Program was innovative, practical, and comprehensive. Education, tools, and skill development were provided on quality and PI theory and practice for resident physicians in support of the Accreditation Council for Graduate Medical Education core competencies of professionalism, practice-based learning and improvement, and systems-based practice.

Effect of the night float system on operative case volume for senior surgical residents.

PURPOSE: In response to the Accreditation Council for Graduate Medical Education (ACGME) mandated 80-hour workweek, the night float coverage model was one system created to comply with the work-hour restriction. However, concern has risen as to the operative case volume achieved with this model. The purpose of this study is to determine which system of call (night float vs traditional rotating call) provided the senior surgical resident with the greatest surgical case volume while in compliance with the 80-hour workweek. METHODS: A nonrandomized sequential study to evaluate the ACGME surgical operative logs (SOLs) for surgical chief residents at Memorial University Medical Center (MUMC), which is a level 1 trauma center, from 2006 to 2008 was conducted. The night float system (NFS) consisted of a PGY-4 or -5 assigned to in-house general surgery and trauma call from 6:00 pm to 6:00 am Monday through Friday morning and a 24-hour shift from 6:00 am on Sunday to 6:00 am Monday morning. Two months of night call rotations (nights) are performed each year per resident with the other 10 months devoted to daytime rotations (days). Conversely, the traditional rotating call schedule (TCS) placed each resident on-call every sixth night for a 30-hour period. The TCS required the resident to average approximately 3 weekday and 2 weekend calls per month. The data examined include all cases on the ACGME SOL submitted by each PGY-4 and 5 residents over a 2-year span. Specific designation of cases between night and day rotations was evaluated while on the NFS, and the total cases volume performed on the NFS and the TCS were analyzed. RESULTS: An evaluation of the 2006-2007 (NFS) year demonstrates an average of 16 cases per month while on nights as compared with 20 cases per month while on day rotations. The caseload on the night rotation was less than day rotations at the PGY-4/5 level. An analysis of the 2006-2007 (NFS) and 2007-2008 (TCS) for PGY-4/5 residents revealed an average total caseload of 224 and 276, respectively. A statistically significant total case difference of 52 cases over the entire year between the 2 systems of call was appreciated. CONCLUSIONS: Because of the work-hour restrictions, maximizing surgical education has become a necessity. With the various call systems used throughout general surgery programs, this study specifically compares a traditional 1-in-6 call schedule versus an NFS. Senior residents lost significant operative experience while operating under an NFS as compared with a TCS. Evidence suggests that the more hours spent by a chief resident during normal operative time elicits more operative experience.