Impact of COVID-19 infection and vaccination in pancreatobiliary IgG4-related disease patients: An international multicenter study.

BACKGROUND AND AIM: Dedicated studies evaluating the impact of COVID-19 on outcomes of pancreatobiliary IgG4 related disease (IgG4-RD) patients are scarce. Whether COVID-19 infection or vaccination would trigger IgG4-RD exacerbation remains unknown. METHODS: Pancreatobiliary IgG4-RD patients ≥ 18 years old with active follow-up since January 2020 from nine referral centers in Asia, Europe, and North America were included in this multicenter retrospective study. Outcome measures include incidence and severity of COVID-19 infection, IgG4-RD disease activity and treatment status, interruption of indicated IgG4-RD treatment. Prospective data on COVID-19 vaccination status and new COVID-19 infection during the Omicron outbreak were also retrieved in the Hong Kong cohort. RESULTS: Of the 124 pancreatobiliary IgG4-RD patients, 25.0% had active IgG4-RD, 71.0% were on immunosuppressive therapies and 80.6% had ≥ 1 risk factor for severe COVID. In 2020 (pre-vaccination period), two patients (1.6%) had COVID-19 infection (one requiring ICU admission), and 7.2% of patients had interruptions in indicated immunosuppressive treatment for IgG4-RD. Despite a high vaccination rate (85.0%), COVID-19 infection rate has increased to 20.0% during Omicron outbreak in the Hong Kong cohort. A trend towards higher COVID-19 infection rate was noted in the non-fully vaccinated/unvaccinated group (17.6% vs 33.3%, P = 0.376). No IgG4-RD exacerbation following COVID-19 vaccination or infection was observed. CONCLUSION: While a low COVID-19 infection rate with no mortality was observed in pancreatobiliary IgG4-RD patients in the pre-vaccination period of COVID-19, infection rate has increased during the Omicron outbreak despite a high vaccination rate. No IgG4-RD exacerbation after COVID-19 infection or vaccination was observed.

Protocol of early lumen apposing metal stent removal for pseudocysts and walled off necrosis avoids bleeding complications.

Background: EUS-guided drainage of pancreatic fluid collections (PFCs; pancreatic pseudocyst (PPC) or walled-off necrosis (WON)) using lumen apposing metal stents (LAMSs) is now standard of care. We adopted a protocol of early LAMS removal and prospectively followed patients to determine if this protocol avoids bleeding complications.Methods: Prospective, consecutive case series of all patients with PPC and WON who underwent drainage with LAMS at a tertiary care referral center from July 2016 to November 2018. LAMS was removed within 4 weeks for PPC and within 6 weeks for WON. Patients with residual necrosis after 6 weeks underwent removal of initial LAMS and replacement with new LAMS every 6 weeks until resolution. Patients were followed within protocol while monitoring for bleeding complications and clinical success. We also performed a literature review to determine rates of LAMS related bleeding at various timepoints.Results: Forty patients (PPC n = 19, WON n = 21) underwent drainage with LAMS. Median time for LAMS removal was 21.0 days for PPC and 33.5 days for WON. Technical success and clinical success were achieved in 40/40 patients with zero cases of delayed bleeding. A literature review of 21 studies and 1378 patients showed 52/1378 (3.8%) bleeding events with 24/52 (46.2%) events occurring within 1 week of LAMS placement.Conclusions: An early removal LAMS protocol for PFC is highly efficacious and prevents delayed bleeding. Based on analysis of published cases, half of LAMS related bleeding occurs within the first week suggesting procedural factors rather than stent dwell time impact risk of bleeding.

Low Rates of Malignancy and Mortality in Asymptomatic Patients With Suspected Neoplastic Pancreatic Cysts Beyond 5 Years of Surveillance.

BACKGROUND & AIMS: The 2015 American Gastroenterological Association guidelines recommend discontinuation of surveillance of pancreatic cysts after 5 years, although there are limited data to support this recommendation. We aimed to determine the rate of pancreatic cancer development from neoplastic pancreatic cysts after 5 years of surveillance. METHODS: We performed a retrospective multicenter study, collecting data from 310 patients with asymptomatic suspected neoplastic pancreatic cysts, identified by endoscopic ultrasound from January 2002 to June 2010 at 4 medical centers in California. All patients were followed up for 5 years or more (median, 87 mo; range, 60-189 mo). Data were used to calculate the risk for pancreatic cancer and all-cause mortality. RESULTS: Three patients (1%) developed invasive pancreatic adenocarcinoma. Based on American Gastroenterological Association high-risk features (cyst size > 3 cm, dilated pancreatic duct, mural nodule), risks for cancer were 0%, 1%, and 15% for patients with 0, 1, or 2 high-risk features, respectively. Mortality from nonpancreatic causes was 8-fold higher than mortality from pancreatic cancer after more than 5 years of surveillance. CONCLUSIONS: There is a very low risk of malignant transformation of asymptomatic neoplastic pancreatic cysts after 5 years. Patients with pancreatic lesions and 0 or 1 high-risk feature have a less than 1% risk of developing pancreatic cancer, therefore discontinuation of surveillance can be considered for select patients. Patients with neoplastic pancreatic cysts with 2 high-risk features have a 15% risk of subsequent pancreatic cancer, therefore surgery or continued surveillance should be considered.

Rapid Growth Rates of Suspected Pancreatic Cyst Branch Duct Intraductal Papillary Mucinous Neoplasms Predict Malignancy.

BACKGROUND: The majority of branch duct intraductal papillary mucinous neoplasms (BD-IPMNs) are recommended for surveillance imaging based on consensus guidelines. However, growth rates that should prompt concern for malignant transformation of BD-IPMN are unknown. AIMS: To determine whether BD-IPMN growth can predict an increased risk of malignancy and define growth rates concerning for malignant BD-IPMN. METHODS: The study is a retrospective, multicenter study of suspected BD-IPMN patients undergoing imaging surveillance. All patients underwent EUS evaluation followed by surveillance imaging. RESULTS: Two hundred and eighty-four patients with suspected BD-IPMN without worrisome features or high-risk stigmata were followed for a median 56 months and underwent a median of four imaging studies. Nine patients (3.2 %) developed malignant BD-IPMN. Malignant BD-IPMN grew at a faster rate (18.6 vs. 0.8 mm/year; P = 0.05) compared to benign BD-IPMN. BD-IPMN growth rate between 2 and 5 mm/year was associated with an increased risk of malignancy with hazard ratio (HR) of 11.4 (95 % CI 2.2-58.6) when compared to subjects with BD-IPMN growth rate <2 mm/year (P = 0.004). BD-IPMN growth rate ≥5 mm/year had a hazard ratio of 19.5 (95 % CI 2.4-157.8) (P = 0.005). BD-IPMN growth rate of 2 mm/year had a sensitivity of 78 %, specificity of 90 %, and accuracy of 88 % to identify malignancy. Total BD-IPMN growth was also associated with increased risk of malignancy (P = 0.003) with all malignant IPMNs growing at least 10 mm prior to cancer diagnosis. CONCLUSIONS: BD-IPMN growth rates ≥2 mm/year and total growth of ≥10 mm should be considered worrisome features for BD-IPMN at increased risk of malignancy.

Laparo-endoscopic transgastric resection of gastric submucosal tumors.

BACKGROUND: Laparoscopic and endoluminal surgical techniques have evolved and allowed improvements in the methods for treating benign and malignant gastrointestinal diseases. To date, only case reports have been reported on the application of a laparo-endoscopic approach for resecting gastric submucosal tumors (SMT). In this study, we aimed to evaluate the efficacy, safety, and oncologic outcomes of a laparo-endoscopic transgastric approach to resect tumors that would traditionally require either a laparoscopic or open surgical approach. Herein, we present the largest single institution series utilizing this technique for the resection of gastric SMT in North America. METHODS: We performed a retrospective review of a prospectively collected patient database. Patients who presented for evaluation of gastric SMT were offered this surgical procedure and informed consents were obtained for participation in the study. RESULTS: Fourteen patients were included in this study between August/2010 and January/2013. Eight (8) patients (57.1 %) were female and the median age was 56 years (range 29-78). Of the 14 cases, 8 patients (57.1 %) underwent laparo-endoscopic resection of SMTs with transgastric extraction, 5 patients (35.7 %) had conversions to traditional laparoscopic surgery, and 1 patient (7.2 %) was abandoned intraoperatively. The median operative time for this cohort was 80 min (range 35-167). Ten patients (71.4 %) had GISTs, 3 (21.4 %) had leiomyomas, and 1 (7.1 %) had schwannoma. There were no intraoperative complications. Two patients had postoperative staple line bleeding that required repeat endoscopy. The median hospital stay was 1 day (range 1-6) and there were no postoperative mortalities. At 12-month follow-up visit, only one GIST patient (10 %) had tumor recurrence. CONCLUSION: Our experience suggests that this surgical approach is safe and efficient in the resection of gastric SMT with transgastric extraction. This study found no intraoperative complications and optimal oncologic outcomes during the follow-up period. Minimally invasive surgical approaches are emerging as a valid and potentially better approach for resecting malignancies; however, continued investigation is underway to further validate this data.

Malignant cell contamination may lead to false-positive findings at endosonographic fine needle aspiration for tumor staging.

BACKGROUND AND STUDY AIMS: Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) of lymph nodes is used for staging of gastrointestinal malignancies. False-positive rates of 5 % - 7 % are not well understood. Elements of EUS examinations that contribute to false-positive cytological findings were investigated. PATIENTS AND METHODS: 13 patients undergoing EUS staging of gastrointestinal luminal malignancy were consecutively enrolled together with 3 patients with extraluminal tumors (pancreas, lung) defined as controls. After EUS, cellular debris and fluid were collected from the FNA needle catheter, instrument channel, and endoscope tip for cytologic and histologic investigation. RESULTS: 6 of 13 patients (46 %) had malignant cells contaminating the FNA needle catheter, instrument channel, or endoscope tip. Malignant cells were present in the instrument channel in 5 cases (38 %), exterior tip of echoendoscope in 4 (31 %) and needle catheter in 2 (15 %). CONCLUSIONS: Echoendoscopes used for FNA in patients with luminal tumors are at risk for malignant cell contamination of the instrument channel, FNA needle catheter, and echoendoscope tip. FNA needle contamination can contribute to false-positive findings.

Increased rates of duodenal obstruction in pancreatic cancer patients receiving modern medical management.

BACKGROUND: Duodenal obstruction from pancreatic cancer historically occurs in 2-25 % of patients without surgery, but with new advances in chemotherapy and radiation therapy, the life expectancy of pancreatic cancer has increased. AIM: The aim of the study was to determine the rate of development of duodenal obstruction requiring intervention in patients with pancreatic head adenocarcinoma who do not undergo surgical resection, but receive modern chemoradiation. METHODS: It is a retrospective single center study. Inclusion criteria were patients with pancreatic cancer who underwent ERCP with metal biliary stent and then chemoradiation who subsequently developed symptomatic duodenal obstruction and underwent either metal duodenal stent placement or surgical duodenal bypass. RESULTS: Twenty-four of 63 patients (38 %, 95 % CI 26-50 %) with unresectable pancreatic cancer and biliary stents who received chemotherapy and/or radiation therapy developed duodenal obstruction. The average length of time from diagnosis of pancreatic adenocarcinoma to development of outlet obstruction was 11.4 ± 4.9 months (range 1.5-40 months). Average length of time from development of duodenal obstruction to death was 4.8 ± 2.1 months (range 0.5-60 months). Average survival time from diagnosis to death was 16.6 ± 5.6 months (range 4.5-58 months). CONCLUSION: Thirty-eight percent of patients with unresectable pancreatic head adenocarcinoma and metal biliary stents who receive chemotherapy and/or radiation therapy eventually develop symptomatic duodenal obstruction requiring duodenal stent or surgical bypass. This rate of duodenal obstruction is nearly twice that of previous reports using older oncologic therapy and will likely increase as patients survive longer with advances in medical therapy for pancreatic cancer.

Transesophageal endoscopic myotomy (TEEM) for the treatment of achalasia: the United States human experience.

BACKGROUND: From our early experience with NOTES, our group has acquired familiarity with transesophageal submucosal dissection and myotomy in swine model, which allowed us to perfect a model to perform purely endoscopic transesophageal myotomy (TEEM) for the treatment of achalasia and apply it into clinical practice. This study was designed to assess the safety, feasibility, and efficacy of TEEM in a series of patients with achalasia. METHODS: Under institutional review board approval, patients were enrolled on our study, where TEEM was offered as an alternative to laparoscopic or robotic Heller myotomy. The inclusion criteria were patients with achalasia confirmed by esophageal manometry, between age 18 and 50 years, and ASA class 2 or lower. The exclusion criteria were pregnancy, prior esophageal surgery, immunosuppression, coagulopathies, and severe medical comorbidities. The procedures were performed under general anesthesia, with the patient in supine position on positive pressure ventilation. With a GIF-180 (Olympus, Tokyo, Japan) positioned at 10 cm above the GEJ, a mucosotomy was performed at the 2 o'clock position, and a submucosal space was developed caudally creating a controlled submucosal tunnel extending 2 cm distal to the GEJ. Upon completion of this tunnel the gastroesophageal lumen was inspected for mucosal integrity. The scope was then reinserted into the submucosal tunnel and using a triangle-tip knife, myotomy was performed starting at 5 cm above the GEJ and ending at 2 cm below the GEJ. During this process the circular muscle layer of the esophagus was carefully divided with preservation of the longitudinal layer. At the end of the procedure, the mucosal incision was closed longitudinally with endoscopic clips and surgical glue. RESULTS: Five patients underwent TEEM, with no perioperative complication. All patients reported significant improvement of their dysphagia immediately after the procedure. On the first postoperative day, all barium swallows showed disappearance of the classical bird beak taper, rapid emptying of contrast into the stomach, and absence of leaks. All patients were discharged on the second postoperative day on liquid diet. Two patients reported transient heartburn, which were well controlled with medications. The average preoperative GERD-HRQL was 20, which improved to 11.3 at 7 days postoperative and 2 at 30 days postoperative. To date, three patients have already returned for their 6-month follow-up, reporting adequate swallowing and low LES pressures on esophageal manometry (their mean preoperative LES resting pressure was 36.46 mmHg and residual pressure was 43.16 mmHg, whereas the 6-month follow-up mean LES resting pressure was 10.06 mmHg and residual pressure was 0.43 mmHg). CONCLUSIONS: TEEM seems to be safe, feasible, and effective for the treatment of patients with achalasia. Long-term data are still necessary for wide-spread utilization of this novel technique.

Association of physician burnout with perceived EHR work stress and potentially actionable factors.

OBJECTIVE: Physicians of all specialties experienced unprecedented stressors during the COVID-19 pandemic, exacerbating preexisting burnout. We examine burnout's association with perceived and actionable electronic health record (EHR) workload factors and personal, professional, and organizational characteristics with the goal of identifying levers that can be targeted to address burnout. MATERIALS AND METHODS: Survey of physicians of all specialties in an academic health center, using a standard measure of burnout, self-reported EHR work stress, and EHR-based work assessed by the number of messages regarding prescription reauthorization and use of a staff pool to triage messages. Descriptive and multivariable regression analyses examined the relationship among burnout, perceived EHR work stress, and actionable EHR work factors. RESULTS: Of 1038 eligible physicians, 627 responded (60% response rate), 49.8% reported burnout symptoms. Logistic regression analysis suggests that higher odds of burnout are associated with physicians feeling higher level of EHR stress (odds ratio [OR], 1.15; 95% confidence interval [CI], 1.07-1.25), having more prescription reauthorization messages (OR, 1.23; 95% CI, 1.04-1.47), not feeling valued (OR, 3.38; 95% CI, 1.69-7.22) or aligned in values with clinic leaders (OR, 2.81; 95% CI, 1.87-4.27), in medical practice for ≤15 years (OR, 2.57; 95% CI, 1.63-4.12), and sleeping for <6 h/night (OR, 1.73; 95% CI, 1.12-2.67). DISCUSSION: Perceived EHR stress and prescription reauthorization messages are significantly associated with burnout, as are non-EHR factors such as not feeling valued or aligned in values with clinic leaders. Younger physicians need more support. CONCLUSION: A multipronged approach targeting actionable levers and supporting young physicians is needed to implement sustainable improvements in physician well-being.

Long-term risk of cholangitis in patients with metal stents for malignant biliary obstruction.

BACKGROUND: Patients with malignant biliary obstruction are commonly living longer than previously due to improved oncologic therapies, often exceeding expected times of self-expanding metal stent patency. AIMS: The purpose of this study was to assess the long-term risk and impact of cholangitis in these patients. METHODS: Retrospective review of electronic medical records at an academic medical center. RESULTS: One hundred and one patients had a self-expanding metal stent placed for malignant biliary obstruction. The median survival after SEMS was 214 days. Of these patients, 22 % developed at least one episode of cholangitis requiring inpatient admission, 20 % (9/45) of patients were hospitalized for cholangitis at 6 months, 40 % (8/20) at 1 year, and 75 % (3/4) at 2 years. All of the (8/8) patients receiving chemotherapy prior to hospitalization for cholangitis experienced delays in subsequent chemotherapy. Follow-up of 36 episodes of cholangitis revealed a 14 % 30-day mortality. CONCLUSIONS: Cholangitis develops commonly in long-term survivors with self-expanding metal stents for malignant biliary obstruction, and is associated with delays in chemotherapy and a 14 % 30-day mortality.

Initial experience with an innovative endoscopic clipping system.

There are few options for the treatment of fistulas, leaks, and perforations endoscopically. Here we describe our experience with an endoscopic clipping system. A retrospective review of all cases using the Over-The-Scope-Clip system (Ovesco Endoscopy AG, Tuebingen, Germany) was performed. The system was utilized in ten patients with gastrointestinal surgical complications. Four patients had gastric leaks following sleeve gastrectomy, one had a post-operative colonic leak, two had gastro-gastric fistulas following gastric bypass, and three had esophageal perforations. Two leak patients had complete resolution, one had a contained leak following clip placement that was clinically insignificant, and the fourth patient had a persistent leak despite two clipping procedures. Two patients had gastro-gastric fistulas following roux-en-y gastric bypass surgery and, while they both had initial success, the fistulas recurred. One patient presented with anastomotic leak following colon resection but the system was unable to reach the treatment site. Three patients were successfully treated for esophageal perforation. There were no complications. This over-the-scope endoscopic clip system is simple to use, safe, and successful in approximating tissue to treat traditionally difficult surgical complications. Further experience and longer follow-up are needed to assess its indications as related to defect size and location.

Use of a large-diameter 30-French venting gastrostomy tube is effective and safe for symptom palliation in patients with malignant bowel obstruction.

Background: Treatment options for malignant bowel obstruction are limited, particularly in poor surgical candidates. Standard percutaneous endoscopic gastrostomy (PEG) tubes used for venting are of small caliber, limiting success. This study examines outcomes in patients who received larger-caliber 30-Fr PEGs for treatment of malignant bowel obstruction. Method: Retrospective chart review for all patients who received a large-caliber venting PEGs for malignant bowel obstruction in a series of patients at a single institution. Results: Thirty-six patients were included. The most common primary cancer diagnoses were ovarian (22%), mucinous appendiceal (19%), and colorectal (17%). Symptom relief was achieved in all patients (100%). Four patients (11%) sought medical care for recurrent symptoms due to an incorrect venting technique. Large-caliber venting PEGs were placed on the first admission for obstruction in 17 patients (47%), and were used to replace standard caliber PEGs in 8 patients because of persistent symptoms (22%). Significant ascites was observed in 12 patients (33%), but paracenteses were performed in only 3 of these patients prior to PEG placement. Most large-caliber venting PEGs were placed during hospital admission (34/36, 94%), and facilitated hospital discharge (33/34, 97%). Two significant (6%) and 2 minor adverse events (6%) occurred. Conclusions: This study demonstrates the efficacy and safety of large-caliber venting PEGs for malignant bowel obstruction. This facilitated hospital discharge in almost all patients and prevented readmissions when a correct venting technique was utilized; these PEGs were also effective in patients who had failed standard PEG tube venting.

Association of Electronic Health Record Inbasket Message Characteristics With Physician Burnout.

Importance: Physician burnout is an ongoing epidemic; electronic health record (EHR) use has been associated with burnout, and the burden of EHR inbasket messages has grown in the context of the COVID-19 pandemic. Understanding how EHR inbasket messages are associated with physician burnout may uncover new insights for intervention strategies. Objective: To evaluate associations between EHR inbasket message characteristics and physician burnout. Design, Setting, and Participants: Cross-sectional study in a single academic medical center involving physicians from multiple specialties. Data collection took place April to September 2020, and data were analyzed September to December 2020. Exposures: Physicians responded to a survey including the validated Mini-Z 5-point burnout scale. Main Outcomes and Measures: Physician burnout according to the self-reported burnout scale. A sentiment analysis model was used to calculate sentiment scores for EHR inbasket messages extracted for participating physicians. Multivariable modeling was used to model risk of physician burnout using factors such as message characteristics, physician demographics, and clinical practice characteristics. Results: Of 609 physicians who responded to the survey, 297 (48.8%) were women, 343 (56.3%) were White, 391 (64.2%) practiced in outpatient settings, and 428 (70.28%) had been in medical practice for 15 years or less. Half (307 [50.4%]) reported burnout (score of 3 or higher). A total of 1 453 245 inbasket messages were extracted, of which 630 828 (43.4%) were patient messages. Among negative messages, common words included medical conditions, expletives and/or profanity, and words related to violence. There were no significant associations between message characteristics (including sentiment scores) and burnout. Odds of burnout were significantly higher among Hispanic/Latino physicians (odds ratio [OR], 3.44; 95% CI, 1.18-10.61; P = .03) and women (OR, 1.60; 95% CI, 1.13-2.27; P = .01), and significantly lower among physicians in clinical practice for more than 15 years (OR, 0.46; 95% CI, 0.30-0.68; P < .001). Conclusions and Relevance: In this cross-sectional study, message characteristics were not associated with physician burnout, but the presence of expletives and violent words represents an opportunity for improving patient engagement, EHR portal design, or filters. Natural language processing represents a novel approach to understanding potential associations between EHR inbasket messages and physician burnout and may also help inform quality improvement initiatives aimed at improving patient experience.

Quality of colonoscopy withdrawal technique and variability in adenoma detection rates (with videos).

BACKGROUND: Studies suggest that endoscopist-related factors such as colonoscopy withdrawal time are important in determining the adenoma detection rate (ADR). OBJECTIVE: To determine the importance of withdrawal technique in differentiating among endoscopists with varying ADRs. DESIGN: Prospective, multicenter study. SETTING: Five academic tertiary-care medical centers. PARTICIPANTS: This study involved 11 gastroenterology faculty endoscopists. INTERVENTION: A retrospective review of screening colonoscopies was performed to categorize endoscopists into low, moderate, and high ADR groups. Video recordings were randomly obtained for each endoscopist on 20 (10 real, 10 sham) withdrawals during colonoscopies performed for average-risk colorectal cancer screening. Three blinded reviewers assigned withdrawal technique scores (total of 75 points) on 110 video recordings. A separate reviewer recorded withdrawal times. MAIN OUTCOME MEASUREMENTS: Withdrawal technique scores and withdrawal times. RESULTS: Mean (± standard deviation [SD]) withdrawal technique scores were higher in the moderate (62 ± 2.5) and high (59.5 ± 3) ADR groups compared with the low (40.8±3) ADR group (P = .002). Mean (± SD) withdrawal times were 6.3 ± 1.8 minutes (low ADR), 10.2 ± 1.5 minutes (moderate ADR), and 8.2 ± 1.8 minutes (high ADR) (P = .29). A comparison of the withdrawal times and technique scores of the two individual endoscopists with the lowest and highest ADRs did not find a significant difference in withdrawal times (6.6 ± 1.7 vs 7.4 ± 1.7 minutes) (P = .36) but did find a nearly 2-fold difference in technique scores (36.2 ± 9 vs 62.8 ± 9.9) (P = .0001). LIMITATIONS: Not adequately powered to detect small differences in withdrawal times. CONCLUSION: Withdrawal technique is an important indicator that differentiates between endoscopists with varying ADRs. It is possible that withdrawal technique is equal to, if not more important than, withdrawal time in determining ADRs.

Missed work related to mid-week screening colonoscopy.

BACKGROUND: Most screening colonoscopies require patients to miss work on the day of the procedure. Little is known about whether patients are taking additional time off from work, and the reasons for doing so. AIMS: The purpose of this study was to assess the patterns and reasons for missed work related to screening colonoscopies. METHODS: All outpatient screening colonoscopy procedures performed at an academic medical center over 6 months were reviewed. Exclusions included procedures performed for other indications, patients age 65 or older, procedures performed on Monday or Friday, and patients who were not working. Patients were interviewed by telephone regarding missed work time and the reasons for doing so. RESULTS: Sixty-eight patients met all inclusion criteria. Thirty-four percent missed work on more than the day of the procedure. Thirty-two percent took the day prior off, 10% took the day after off, and 9% took both days off. The reason for taking the day before the procedure off was uniformly anticipation of the bowel preparation. Of those who took the day after off, 57% did so as a precautionary measure after moderate sedation, while 43% had symptoms. CONCLUSIONS: One third of working patients who undergo mid-week screening colonoscopies miss work on additional days to the procedure day. Unanticipated time missed from work could increase the indirect costs of screening colonoscopy.

Pancreatic rest resection using band ligation snare polypectomy.

BACKGROUND: Although pancreatic rests have characteristic endoscopic features, confirming a histological diagnosis may be desirable to exclude other significant pathology. AIMS: The aim of this study was to assess the efficacy and safety of endoscopic band ligation snare polypectomy (EBLSP) for removal of suspected pancreatic rests and to compare the diagnostic yield to other endoscopic tissue sampling methods. METHODS: An electronic endoscopic report database was searched for patients referred for evaluation of incidentally found gastric antral subepithelial lesions. Tissue sampling technique, pathology, and complications were recorded. RESULTS: Removal of suspected pancreatic rests with EBLSP was successful in all 21 cases without complications. Nineteen of 21 (90%) who underwent EBLSP had a histological diagnosis of heterotopic pancreas compared with 5 of 14 (36%) who underwent tissue sampling with biopsy and/or snare (P = 0.001). The endoscopic characteristics of the histology proven pancreatic rests were an antral subepithelial mass with central umbilication measuring 6-10 mm in diameter and located 2-6 cm from the pylorus in the 3-7 o'clock position. CONCLUSIONS: Endoscopic band ligation snare polypectomy resection of gastric antral lesions suspected to be pancreatic rests had a diagnostic yield superior to standard biopsy forceps and snare polypectomy techniques. However, because all pathologically confirmed pancreatic rests had typical endoscopic appearances of pancreatic rests, it may not be necessary to obtain histologic diagnosis for every suspected gastric antral heterotopic pancreas.

A Patient-Derived Orthotopic Xenograft Model of Gastroesophageal-Junction Adenocarcinoma Translated to the Clinic by Tumor-Targeting Fluorescent Antibodies to Carcinoembryonic-Antigen-Related Cell-Adhesion Molecules.

BACKGROUND/AIM: During surgical resection of gastroesophageal-junction (GEJ) adenocarcinoma, the margin status is often difficult to visualize resulting in high recurrence rates. The aim of the present study was to develop a labelling technique that would allow improved visualization of GEJ tumor margins for surgeons to reduce recurrence rates in a patient-like model. MATERIALS AND METHODS: A patient GEJ tumor was obtained from an endoscopic biopsy and implanted subcutaneously in a nude mouse. A patient-derived orthotopic xenograft (PDOX) model was established by implanting tumor fragments grown from a subcutaneous model to the cardia of the stomach of nude mice. CC1/3/5-SAB, an antibody to carcinoembryonic-antigen-related cell-adhesion molecules, was conjugated with infrared dye IRDye800 to create SAB-IR800. Forty-eight hours after i.v. injection of SAB-IR800, GEJ-PDOX mice were imaged. RESULTS: Fluorescence imaging with SAB-IR800 brightly visualized the GEJ adenocarcinoma demonstrating specific targeting. In the PDOX model, injection of SAB-IR800 (50 µg) resulted in a tumor to background ratio of 1.78 at 48 hours and 1.86 at 72 hours. CONCLUSION: PDOX models of GEJ tumors can be established from patients by endoscopic biopsy without undergoing surgical resection. GEJ PDOX models should be useful for developing novel diagnostics and therapeutics for this recalcitrant disease.