Use of targeted educational resources to improve robotic bariatric surgery training.

BACKGROUND: Evidence for how to best train surgical residents for robotic bariatric procedures is lacking. We developed targeted educational resources to promote progression on the robotic bariatric learning curve. This study aimed to characterize the effect of resources on resident participation in robotic bariatric procedures. METHODS: Performance metrics from the da Vinci Surgical System were retrospectively reviewed for sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB) cases involving general surgery trainees with a single robotic bariatric surgeon. Pictorial case guides and narrated operative videos were developed for these procedures and disseminated to trainees. Percent active control time (%ACT)-amount of trainee console time spent in active instrument manipulations over total active time from both consoles-was the primary outcome measure following dissemination. One-way ANOVA, Student's t-tests, and Pearson correlations were applied. RESULTS: From September 2020 to July 2021, 50 cases (54% SG, 46% RYGB) involving 14 unique trainees (PGY1-PGY5) were included. From November 2021 to May 2022 following dissemination, 29 cases (34% SG, 66% RYGB) involving 8 unique trainees were included. Mean %ACT significantly increased across most trainee groups following resource distribution: 21% versus 38% for PGY3s (p = 0.087), 32% versus 45% for PGY4s (p = 0.0009), and 38% versus 57% for PGY5s (p = 0.0015) and remained significant when stratified by case type. Progressive trainee %ACT was not associated with total active time for SG cases before or after intervention (pre r = - 0.0019, p = 0.9; post r = - 0.039, p = 0.9). It was moderately positively associated with total active time for RYGB cases before dissemination (r = 0.46, p = 0.027) but lost this association following intervention (r = 0.16, p = 0.5). CONCLUSION: Use of targeted educational resources promoted increases in trainee participation in robotic bariatric procedures with more time spent actively operating at the console. As educators continue to develop robotic training curricula, efforts should include high-quality resource development for other sub-specialty procedures. Future work will examine the impact of increased trainee participation on clinical and patient outcomes.

Human serous cavity macrophages and dendritic cells possess counterparts in the mouse with a distinct distribution between species.

In mouse peritoneal and other serous cavities, the transcription factor GATA6 drives the identity of the major cavity resident population of macrophages, with a smaller subset of cavity-resident macrophages dependent on the transcription factor IRF4. Here we showed that GATA6+ macrophages in the human peritoneum were rare, regardless of age. Instead, more human peritoneal macrophages aligned with mouse CD206+ LYVE1+ cavity macrophages that represent a differentiation stage just preceding expression of GATA6. A low abundance of CD206+ macrophages was retained in C57BL/6J mice fed a high-fat diet and in wild-captured mice, suggesting that differences between serous cavity-resident macrophages in humans and mice were not environmental. IRF4-dependent mouse serous cavity macrophages aligned closely with human CD1c+CD14+CD64+ peritoneal cells, which, in turn, resembled human peritoneal CD1c+CD14-CD64- cDC2. Thus, major populations of serous cavity-resident mononuclear phagocytes in humans and mice shared common features, but the proportions of different macrophage differentiation stages greatly differ between the two species, and dendritic cell (DC2)-like cells were especially prominent in humans.

Endoscopic Management of Gastric Band Erosion: a Systematic Review and Meta-Analysis.

BACKGROUND: Gastric band erosion may be seen in up to 3% of patients. Endoscopic intervention has become increasingly utilized due to its minimally invasive nature. The purpose of this study was to perform a systematic review and meta-analysis to examine the role of endoscopic removal for eroded gastric bands. METHODS: Individualized search strategies were developed for PubMed, EMBASE, Web of Science, and Cochrane Library databases in accordance with PRISMA and MOOSE guidelines. Outcomes included technical success, clinical success, procedure duration, adverse events, and surgical conversion. Pooled proportions were analyzed using random effects models. Heterogeneity and publication bias was assessed with I2 statistics and funnel plot asymmetry using Egger and Begg tests. Meta-regression was also performed comparing outcomes by endoscopic tools. RESULTS: Ten studies (n=282 patients) were included in this meta-analysis. Mean age was 40.68±7.25 years with average duration of band placement of 38.49±19.88 months. Pre-operative BMI was 42.76±1.06 kg/m2 with BMI of 33.06±3.81 kg/m2 at time of band erosion treatment. Endoscopic removal was attempted in 240/282 (85.11%) of cases. Pooled technical and clinical success of the endoscopic therapy was 86.08% (95% CI: 79.42-90.83; I2=28.62%) and 85.34% (95% CI: 88.70-90.62; I2=38.56%), respectively. Mean procedure time for endoscopic removal was 46.47±11.52 min with an intra-operative adverse event rate of 4.15% (95% CI: 1.98-8.51; I2=0.00%). Post-procedure-associated adverse events occurred in 7.24% (CI: 4.46-11.55; I2=0.00%) of patients. Conversion to laparotomy/laparoscopy occurred in 10.54% (95% CI: 6.12-17.54) of cases. CONCLUSION: Endoscopic intervention is a highly effective and safe modality for the treatment of gastric band erosion.

National Trends in Pediatric Metabolic and Bariatric Surgery: 2010-2017.

BACKGROUND: The childhood obesity epidemic has grown exponentially and is known to disproportionately affect minority groups. Successful treatment of this complex health issue requires a multidisciplinary approach including metabolic and bariatric surgery (MBS) for qualifying pediatric patients. This study examines current national trends in pediatric bariatric surgery from 2010 to 2017 using the National Inpatient Sample. METHODS: This study analyzed MBS among pediatric patients <19 years old using weighted discharge data from 2010 to 2017. The primary outcome was national procedure rates. Secondary analyses included procedure type, demographics, BMI, comorbidities, length of stay, and complication rates. RESULTS: From 2010 to 2017, annual bariatric procedure rates increased from 2.29 to 4.62 per 100 000 (P < .001). Laparoscopic sleeve gastrectomy outpaced Roux-en-Y gastric bypass and laparoscopic adjustable gastric band over time (0.31-3.99 per 100 000, P < .0001). The mean age was stable over time 18.10-17.96 (P = .78). The cohort was primarily female (76.5% to 75.4%), white (54.0% to 45.0%), and privately-insured (59.9% to 53.4%). Preoperative BMI increased from 2010 to 2017 (P < .001), whereas number of obesity-related comorbidities was stable (P > .05). Length of stay was <2 days (2.02-1.75, P = .04) and in-hospital complication rates were low (7.2% to 6.45%, P = .88). CONCLUSIONS: Pediatric MBS is underutilized nationally with disproportionately lower rates among minority groups. Despite incremental progress, further investigation into the racial and social determinants that limit access to pediatric weight loss surgery is critical.

An Analysis of Diversity Statements and Support of Special Interest Societies by General Surgery Residency Programs.

OBJECTIVE: The purpose of this study was to characterize the nondiscrimination and diversity, equity, and inclusion (DEI) statements found on the websites of general surgery residency programs, as well as to measure programmatic commitment to diversity through their involvement with special interest surgical societies (SISS). DESIGN: The authors evaluated the relationship between DEI statements and SISS participation, and performed a natural language processing analysis of general surgery residency DEI statements. SETTING: The residency program websites from 319 non-military general surgery residency programs within the United States were analyzed. PARTICIPANTS: This study evaluated the DEI statement and SISS participation in general surgery residency programs. RESULTS: Of the 319 general surgery residency websites reviewed, 127 (39.8%) featured an identifiable statement of nondiscrimination or commitment to diversity. Compared to programs without diversity statements, programs with statements were more likely to be involved with special interest surgical societies (53.5% vs 30.7%, p < 0.001). Natural language processing analysis revealed that the diversity statements of programs with SISS involvement had higher word counts (p = 0.001), higher clout scores (measure of confidence conveyed, p = 0.001), and higher positive tone scores (p = 0.006) compared with the statements of those without special interest society involvement. CONCLUSIONS: In the era of virtual interviewing, applicants are forced to rely heavily on surgery residency websites as their main source of information. Less than 40% of programs participating in the Match in 2022 feature diversity statements on their websites. Programs with some degree of involvement with special interest societies were more likely to have statements that score higher in confidence and positivity in natural language processing analysis, which may potentially reflect a more earnest commitment to diversity, equity, and inclusion. Residency programs should continue to improve the visibility of their DEI efforts to recruit a diverse resident class.

National Trends and Outcomes in Adolescents Undergoing Bariatric Surgery.

BACKGROUND: In the US, obesity continues to be a severe health issue now affecting adolescents. Bariatric surgery remains the most effective treatment for obesity, but use among adolescents remains low. The objective of this study was to identify current national trends in bariatric surgery among adolescents. STUDY DESIGN: Using the Nationwide Inpatient Sample database, adolescents aged 9 to 19 with a diagnosis of morbid obesity who underwent a laparoscopic gastric bypass (Roux-en-Y gastric bypass) or laparoscopic sleeve gastrectomy (SG) between 2015 and 2018 were identified. Demographics, comorbidities, and in-hospital complications were collected. National estimates were calculated. The trend of annual number of operations was determined by Kruskal-Wallis rank test. RESULTS: Between 2015 and 2018, 1,203 adolescents were identified, resulting in a nationwide estimate of 4,807 bariatric cases. The number of bariatric operations increased annually from 1,360 in 2015 to 1,740 operations in 2018 (p = 0.0771). The majority of patients were female (76%), 17 to 19 years old (84.1%), and White (47.9%). Most patients underwent SG (82.0%). Black and Hispanic patients comprised 40.2% of the cohort. Significant comorbidities included diabetes, dyslipidemia, nonalcoholic fatty liver disease, hypertension, and sleep apnea. The average length of stay decreased from 2.12 days to 1.64 days. There were no in-hospital mortalities, and complications were less than 1%. CONCLUSIONS: With the increasing prevalence of obesity among adolescents in the US, bariatric surgery increased over time but was performed less in patients younger than 16 years of age and racial minorities. Bariatric surgery among adolescents remains safe, with extremely low complication rates and zero in-hospital mortality.

Understanding the Current Role of Robotic-Assisted Bariatric Surgery.

BACKGROUND: The role of robotic surgery in bariatrics remains controversial. Patient selection for robotic surgery is not well-studied. The objective of this study was to identify factors associated with robotic surgery and its temporal trends. METHODS: The Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program database from 2015 to 2018 was used. Adult patients undergoing primary sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB) using the laparoscopic or robotic approach were identified. Revisional, hybrid, or those with concomitant procedures were excluded. Logistic regression was conducted to identify factors associated with undergoing robotic-assisted surgery. RESULTS: Among 211,568 patients who underwent SG, 9.1% underwent a robotic SG; among 76,805 patients who underwent RYGB, 7.9% of patients underwent a robotic RYGB. During 2015-2018, robotics increased from 7.1 to 11.3% for SG and 7.4 to 8.6% for RYGB. After controlling for patient characteristics, there was still an increasing trend in the use of robotic surgery: SG (multivariable-adjusted odds ratio, aOR, 1.18; 95% confidence interval, CI, 1.17-1.20) and RYGB (aOR, 1.05; 95% CI, 1.03-1.08). For both robotic SG and RYGB, functional status and African American race were associated with undergoing robotic surgery, while races other than White or African American and Hispanic ethnicity were not. Pre-operative IVC filter was associated with robotic SG, while the presence of GERD, diabetes, and COPD were associated with robotic RYGB. CONCLUSIONS: Robotic bariatric surgery has increased over time. Our findings identified factors associated with the receipt of robotic surgery. Reasons for these factors require further investigation to better delineate indications for this technology.

Initial Experience with a Virtual Platform for Advanced Gastrointestinal Minimally Invasive Surgery Fellowship Interviews.

BACKGROUND: The COVID-19 pandemic travel restrictions triggered a rapid alteration in the interview process for fellowships this spring. We describe our initial experience with virtual interviews for Advanced Gastrointestinal (GI) Minimally Invasive Surgery Fellowships and assess the value and limitations via a post-interview applicant survey. STUDY DESIGN: Twenty candidates were interviewed via Zoom teleconferencing during March and April 2020 using combined group and breakout rooms. An anonymous post-interview Likert and free text survey was sent to candidates with questions regarding feasibility, appropriateness, and acceptability of this method. RESULTS: Seventeen of 20 candidates (85%) responded to the survey. The candidates rated ease of interaction with the program director, faculty surgeons, and the current fellow highly: 94%, 83%, and 89%, respectively. The majority (53%) stated the virtual interviews exceeded or met expectations. Only a minority, 12%, reported the virtual platform was short of expectations. Approximately 70% noted little to no impact of not being able to conduct these interviews in-person and not being able to physically see the program institution. Overall, 94% were satisfied with their experience, and only 6% were neutral, with no respondents reporting dissatisfaction. Finally, 76% would recommend a virtual interview in the future. Most negative open response comments were secondary to issues with software rather than the lack of the in-person traditional interviews. CONCLUSIONS: The use of a remote teleconferencing platform provides a favorable method for conducting fellowship interviews and results in a high degree of candidate satisfaction. Virtual interviews will likely be increasingly substituted for in-person interviews across the spectrum of medical training.

Outcomes in Older Patients with Grade III Cholecystitis and Cholecystostomy Tube Placement: A Propensity Score Analysis.

BACKGROUND: The Tokyo Guidelines recommend initial cholecystostomy tube drainage, antibiotics, and delayed cholecystectomy in patients with grade III cholecystitis. STUDY DESIGN: We used Medicare data (1996 to 2010) to identify patients 66 years and older who were admitted with grade III acute cholecystitis. We evaluated adherence to the Tokyo Guidelines and compared mortality, readmission, and complication rates with and without cholecystostomy tube placement in a propensity-matched (1:3) cohort of patients with grade III cholecystitis. RESULTS: There were 8,818 patients admitted with grade III cholecystitis; 565 patients (6.4%) had a cholecystostomy tube placed. Cholecystostomy tube placement increased from 3.9% to 9.7% during the study period. Compared with 1,689 propensity-matched controls, patients with cholecystostomy tube placement had higher 30-day (hazard ratio [HR] = 1.26; 95% CI 1.05 to 1.50), 90-day (HR = 1.26; 95% CI 1.08 to 1.46), and 2-year mortality (HR = 1.19; 95% CI 1.04 to 1.36) and were less likely to undergo cholecystectomy in the 2 years after initial hospitalization (33.4% vs 64.4%; HR = 0.26; 95% CI 0.21 to 0.31). Readmissions were also higher at 30 days (HR = 2.93; 95% CI 2.12 to 4.05), 90 days (HR = 3.48; 95% CI 2.60 to 4.64), and 2 years (HR = 3.08; 95% CI 2.87 to 4.90). CONCLUSIONS: Since the introduction of the Tokyo Guidelines (2007), use of cholecystostomy tubes in patients with grade III cholecystitis has increased, but the majority of patients do not get cholecystostomy tube drainage as first-line therapy. Cholecystostomy tube placement was associated with lower rates of definitive treatment with cholecystectomy, higher mortality, and higher readmission rates. These data suggest a need for additional evaluation and refinement of the Tokyo Guidelines.

The role of extended criteria donors in liver transplantation for nonalcoholic steatohepatitis.

BACKGROUND: Nonalcoholic steatohepatitis is expected to become the leading indication for liver transplantation. Use of extended criteria donors (ECD) may help with donor allocation in these patients. The objective of this study was to determine the use of ECDs in patients with nonalcoholic steatohepatitis undergoing liver transplantation to stimulate a liver-specific predictive model for ECD use. METHODS: The United Network for Organ Sharing database was used to identify patients undergoing liver transplantation for nonalcoholic steatohepatitis (2002-2014). Cox hazards models were created using (1) United Network for Organ Sharing ECD criteria (based on kidney allocation), (2) individual donor characteristics (age, sex, race, cause of death, body mass index, cold ischemic time), and (3) the Kidney Donor Profile Index (KDPI) to examine the effect of ECDs on mortality and graft failure. RESULTS: A total of 4,387 patients underwent liver transplantation for nonalcoholic steatohepatitis; 1,359 (30.9%) patients received an ECD. Transplantation with ECD livers had comparable patient survival (hazard ratio [HR] 1.06, 95% confidence interval [CI] 0.91-1.23) between donor types but an increased risk of graft failure (HR 1.18, 95% CI 1.03-1.36) compared to standard donors. Individual characteristics did not affect patient survival or graft failure. A 10% increase in KDPI was associated with a 28% increase in patient mortality (HR 1.28, 95% CI 1.02-1.60) and 45% increase in graft failure (HR 1.45, 95% CI 1.18-1.80). CONCLUSION: Based on the current United Network for Organ Sharing definition, ECDs in nonalcoholic steatohepatitis were associated with similar overall survival but increased risk of graft failure. Given the shortage of organs, creation of an easily calculated, liver-specific model similar to the KDPI may help risk stratify patients and improve organ allocation.

Incidence of hepaticojejunostomy stricture after hepaticojejunostomy.

BACKGROUND: Operations requiring biliary-enteric anastomosis are uncommon, and the true incidence of postoperative stricture is unknown. Our goal was to determine the timing, incidence, and management of stricture after biliary-enteric anastomosis. METHODS: We used 5% Medicare claims data (1996-2011) to identify patients ≥66 years who underwent an operation requiring a biliary-enteric anastomosis. A cumulative incidence curve was used to describe timing of stricture diagnosis. The use of imaging and intervention was evaluated. A Cox proportional hazards model was constructed to identify factors associated with stricture. RESULTS: A total of 3,374 patients underwent an operation requiring either a hepaticojejunostomy (54.33%; N = 1,833) or choledochojejunostomy (45.67%; N = 1,541); 2-year survival was 57.0%. Overall, 403 (11.9%) patients developed a stricture. The cumulative incidence of stricture was 12.5% at 2 years. Mean time to stricture diagnosis was 16.8 ± 21.6 months (median = 8.5 months); 23% of patients with a stricture required hospitalization for cholangitis (N = 94). Only 18 (4.5%) patients with a stricture required reoperation. Younger age (hazard ratio 0.98; 95% confidence interval 0.98-0.99) was associated with a decreased likelihood of stricture formation; presence of an endostent (hazard ratio 1.66; 95% confidence interval 1.35-2.04) predicted stricture formation. CONCLUSION: Biliary-enteric anastomotic strictures occur with significant frequency after a biliary-enteric anastomosis. Although many patients are managed nonoperatively, stricture diagnosis remains burdensome.

Trends in Follow-Up of Patients Presenting to the Emergency Department with Symptomatic Cholelithiasis.

BACKGROUND: Fewer than 25% of Medicare beneficiaries presenting with symptomatic cholelithiasis undergo elective cholecystectomy. To better understand underuse of cholecystectomy, we examined physician follow-up patterns after emergency department (ED) visits for symptomatic gallstones. STUDY DESIGN: We used 100% Texas Medicare claims (2001 to 2010) to identify patients 66 years of age and older who presented to the ED with symptomatic cholelithiasis and were discharged home without cholecystectomy. Timing of outpatient physician visits after ED discharge and rates of emergent cholecystectomy based on physician follow-up patterns were compared. RESULTS: In total, 11,126 patients presented to the ED with symptomatic cholelithiasis and were discharged without cholecystectomy. After discharge, 5,327 patients (47.9%) had an outpatient surgeon visit, 29.0% saw another physician and never saw a surgeon, and 23.1% never saw a physician; 68.2% of patients who saw a surgeon underwent elective cholecystectomy; and 8.3% of patients who saw a surgeon, 14.6% of patients who saw other physicians and no surgeon, and 77.6% of patients who never saw any physician, required emergent hospitalization (p < 0.0001). For people who did not see a physician, mean time to emergent hospitalization was 7.5 days (median 2 days); 95.9% presented within 2 weeks after their initial presentation. CONCLUSIONS: Fewer than half of patients were evaluated by a surgeon after an initial ED visit for symptomatic gallstones. Patients who did not have physician follow-up were most likely to require emergent cholecystectomy, suggesting inappropriate ED discharge and highlighting the need for timely follow-up. Early outpatient surgical consultation is critical in determining appropriateness for cholecystectomy and avoiding emergent cholecystectomy in older patients with symptomatic gallstones.

Hospital readmission after emergency room visit for cholelithiasis.

BACKGROUND: For patients presenting with symptomatic cholelithiasis, cholecystectomy is the definitive treatment modality. Our goal was to evaluate the surgical follow-up and outcomes in patients seen in the emergency department (ED) for an episode of symptomatic cholelithiasis and discharged home for elective follow-up. METHODS: We performed a retrospective review of consecutive patients seen in the ED for cholelithiasis and discharged without hospital admission between August 2009 and May 2014. All patients were followed for 2 y from the date of the initial ED visit. We evaluated outpatient surgeon visits, elective and emergent cholecystectomy rates, and additional ED visits. Cumulative incidence and Kaplan-Meier curves were used to examine the time from the initial ED visit to outpatient surgeon evaluation and the time from the initial ED visit to ED readmission. RESULTS: Seventy-one patients were discharged from the ED with a diagnosis of symptomatic gallstones. Patients who had an elective cholecystectomy in the 2 y after the initial visit were 12.6%. In this group, the mean time from the initial ED visit to outpatient surgeon follow-up was 7.7 d, and all elective cholecystectomies occurred within 1 mo of the initial visit. Of the 62 patients who did not have an elective cholecystectomy, only 14.5% of patients in this group had outpatient surgeon follow-up at mean time of 137 d from the initial ED visit for symptomatic gallstones. In addition, 37.1% of patients in this group had additional ED visits for gallstone-related symptoms, with 17.7% of patients having two or more additional ED visits, and 12.9% required emergent and/or urgent cholecystectomy. Additional ED visits (43.5%) occurred within 1 mo and 60.9% within 3 mo of their initial ED visit. In patients with additional ED visits for symptomatic cholelithiasis, 60.9% had more than one abdominal ultrasound or computed tomography scan during the course of multiple visits. CONCLUSIONS: Failure to achieve a timely surgical follow-up leads to multiple ED readmissions and emergent gallstone-related hospitalizations, including emergency cholecystectomy. System-level interventions to ensure outpatient surgical follow-up within 1-2 wk of the initial ED visit has the potential to improve outcomes for patients with symptomatic biliary colic.

The risk paradox: use of elective cholecystectomy in older patients is independent of their risk of developing complications.

BACKGROUND: We recently developed and validated a prognostic model that accurately predicts the 2-year risk of emergent gallstone-related hospitalization in older patients presenting with symptomatic gallstones. STUDY DESIGN: We used 100% Texas Medicare data (2000 to 2011) to identify patients aged 66 years and older with an initial episode of symptomatic gallstones not requiring emergency hospitalization. At presentation, we calculated each patient's risk of 2-year gallstone-related emergent hospitalization using the previously validated model. Patients were placed into the following risk groups based on model estimates: <30%, 30% to <60%, and ≥ 60%. Within each risk group, we calculated the percent of elective cholecystectomies (≤ 2.5 months from initial episode) performed. RESULTS: In all, 161,568 patients had an episode of symptomatic gallstones. Mean age was 76.5 ± 7.3 years and 59.9% were female. The 2-year risk of gallstone-related hospitalizations increased from 15.9% to 41.5% to 65.2% across risk groups. For the overall cohort, 22.3% in the low-risk group, 20.9% in the moderate-risk group, and 23.2% in the high-risk group underwent elective cholecystectomy in the 2.5 months after the initial symptomatic episode. In patients with no comorbidities, elective cholecystectomy rates decreased from 34.2% in the low-risk group to 26.7% in the high-risk group. Of patients who did not undergo cholecystectomy, only 9.5% were seen by a surgeon in the 2.5 months after the initial episode. CONCLUSIONS: The risk of recurrent acute biliary symptoms requiring hospitalization has no influence, or even a paradoxical negative influence, on the decision to perform elective cholecystectomy after an initial symptomatic episode. Translation of the risk prediction model into clinical practice can better align treatment with risk and improve outcomes in older patients with symptomatic gallstones.