Sigmoid volvulus: Evaluating identification strategies and contemporary multicenter outcomes.

BACKGROUND: There is limited epidemiologic data on sigmoid volvulus (SV) from non-endemic regions. Therefore, we performed a multicenter study to report contemporary outcomes and appraise literature-based methods that pair diagnostic and procedural codes to identify SV. METHOD: Using an automated search for patients with 'volvulus' in our system from 2011 to 2021, we reviewed electronic charts to clarify the diagnosis, automatically replicate three strategies to identify SV, and retrieved 6-month outcomes. RESULTS: Of 895 patients, 109 had SV. Literature-based strategies poorly identified SV. At the index admission, patients underwent endoscopic reduction alone (33%), emergent (16.5%), semi-elective (34%), or elective (16.5%) surgery. Endoscopic reduction alone had high recurrence rates and delayed surgery was associated with worse outcomes. CONCLUSION: Literature-based strategies to identify SV suffer from misclassification bias which affects patient counseling. In this large series, one-third of patients do not undergo during their index admission despite improved outcomes with earlier surgery.

Diffuse Pagetoid Squamous Cell Carcinoma in Situ of the Esophagus: A Rare Case Report and Review of Literature.

Squamous cell carcinoma in situ (SCCIS) with diffuse pagetoid features has been well-described in skin and external genitalia. Diffuse pagetoid SCCIS of the esophagus is extremely rare with only two cases published in the English literature. In this article, we report a rare case of diffuse pagetoid SCCIS of the esophagus in an 89-year-old female with no significant past medical history who presented with dysphagia. Endoscopic examination of the esophagus was remarkable for multiple clean base ulcers spanning 4 cm in the proximal esophagus. Biopsy showed enlarged and hyperchromatic dysplastic cells in the basal half of the epithelium with scattered large individual pagetoid cells as well as several apoptotic dyskeratotic cells in the superficial half of the epithelium. Immunohistochemically, the dysplastic cells were positive for CK7 and p40 with overexpression of p53, and were negative for cytokeratin 20, SOX10, GATA3, CDX2, TTF1. Kreyberg stain was negative for mucin. The histologic features and immunohistochemical profile supported the diagnosis of esophageal diffuse pagetoid SCCIS.

Clinical efficacy of the over-the-scope clip device: A systematic review.

BACKGROUND: The over-the-scope clip (OTSC) system has been increasingly utilized as a non-surgical option to endoscopically manage refractory gastrointestinal (GI) hemorrhage, perforations/luminal defects and fistulas. Limited data exist evaluating the efficacy and safety of OTSC. AIM: To determine the clinical success and adverse event (AE) rates of OTSC across all GI indications. METHODS: A PubMed search was conducted for eligible articles describing the application of the OTSC system for any indication in the GI tract. Any article or case series reporting data for less than 5 total patients was excluded. The primary outcome was the rate of clinical success. Secondary outcomes included: Technical success rate, OTSC-related AE rate and requirement for surgical intervention despite-OTSC placement. Pooled rates (per-indication and overall) were calculated as the number of patients with the event of interest divided by the total number of patients. RESULTS: A total of 85 articles met our inclusion criteria (n = 3025 patients). OTSC was successfully deployed in 94.4% of patients (n = 2856/3025). The overall rate of clinical success (all indications) was 78.4% (n = 2371/3025). Per-indication clinical success rates were as follows: (1) 86.0% (1120/1303) for GI hemorrhage; (2) 85.3% (399/468) for perforation; (3) 55.8% (347/622) for fistulae; (4) 72.6% (284/391) for anastomotic leaks; (5) 92.8% (205/221) for defect closure following endoscopic resection (e.g., following endoscopic mucosal resection or endoscopic submucosal dissection); and (6) 80.0% (16/20) for stent fixation. AE's related to the deployment of OTSC were only reported in 64 of 85 studies (n = 1942 patients), with an overall AE rate of 2.1% (n = 40/1942). Salvage surgical intervention was required in 4.7% of patients (n = 143/3025). CONCLUSION: This systematic review demonstrates that the OTSC system is a safe and effective endoscopic therapy to manage GI hemorrhage, perforations, anastomotic leaks, defects created by endoscopic resections and for stent fixation. Clinical success in fistula management appears limited. Further studies, including randomized controlled trials comparing OTSC with conventional and/or surgical therapies, are needed to determine which indication(s) are the most effective for its use.

Outcomes of gastrointestinal bleeding in patients with left ventricular assist devices: a tertiary care experience.

Background and study aims Left ventricular assist device (LVAD) placement is a therapeutic modality for patients with end-stage heart failure. Gastrointestinal bleeding is a common complication following LVAD implantation. The aim of this study was to report our experience in management and outcomes of gastrointestinal bleeding in a large cohort of patients with LVADs. Patients and methods We performed a retrospective review of all patients who underwent LVAD implantation at the University of Rochester Medical Center from January 2008 to June 2017. Data were collected on patient characteristics, clinical aspects of gastrointestinal bleeding events, and procedural interventions. A Cox proportional hazard model was utilized to identify potential risk factors for a gastrointestinal bleeding event. Results During the study period, 345 patients underwent LVAD implantation. Of these, 125 patients (36.2 %) experienced 297 gastrointestinal bleeding events resulting in 533 endoscopic procedures. The diagnostic yield of endoscopy in determining a bleeding source was 49.5 %. If required, therapeutic interventions were successful in achieving homeostasis in 96.2 % of procedures. Our 30-day overall post-procedure adverse event (AE) rate was 6.6 %. Procedure-related (bleeding, infection, and perforation) AEs were very minimal (2.8 %). A Cox proportional hazard model indicated that older age at implant, female sex, African-American race, diabetes mellitus, and pulmonary hypertension were statistically significant predictors of a gastrointestinal bleeding event following LVAD implantation. Conclusions LVAD patients have a high risk of gastrointestinal bleeding. Endoscopy was able to safely locate a bleeding lesion in approximately half of our patients and was successful in treating bleeding lesions in a majority of the cases.

Role of Endoscopic Ultrasound in Detecting Pancreatic Cancer Missed on Cross-Sectional Imaging in Patients Presenting with Pancreatitis: A Retrospective Review.

INTRODUCTION: Pancreatic cancer is the fourth leading cause of cancer-related death in the USA. Early detection of pancreatic cancer may help improve patient survival. It has been hypothesized that acute idiopathic or chronic pancreatitis is associated with an increased risk of pancreatic cancer; however, these conditions may also represent an early manifestation of pancreatic cancer, rather than just being risk factors. Endoscopic ultrasound (EUS) is a sensitive diagnostic modality for the detection of small, early-stage pancreatic tumors. The aim of this study was to evaluate the diagnostic yield of EUS for pancreatic cancer in patients with acute idiopathic or chronic pancreatitis when cross-sectional imaging (CT and/or MRI) was negative for a mass lesion in the pancreas. METHODS: This study was an IRB-approved retrospective chart review conducted for the period of August 2005 to September 2018. Any patient presenting with acute idiopathic or chronic pancreatitis with a CT and/or MRI imaging negative for a pancreatic mass lesion that underwent an EUS during the study period was selected for inclusion. A retrospective review was performed to evaluate the outcomes of patients who had pancreatic cancer diagnosed from an EUS-FNA (fine needle aspiration) sample. Data were collected on patient demographics and clinical characteristics, inclusive of specific post-diagnosis treatment course. An "event rate" was calculated and is defined as the number of positive pancreatic cancer diagnoses on EUS-FNA from all patients presenting with acute idiopathic or chronic pancreatitis who underwent an EUS examination following a CT and/or MRI study negative for pancreatic mass lesion. RESULTS: A total of 565 patients met inclusion criteria, with 30 cases of confirmed pancreatic cancer diagnosed with EUS-FNA from this group. The event rate for EUS diagnosis of pancreatic cancer was 5.3%. The majority of patients (52.0%) diagnosed with cancer were stages I-II. CONCLUSIONS: Endoscopic ultrasound should be a routine part of the diagnostic algorithm when evaluating a patient with acute idiopathic or chronic pancreatitis of unclear etiology, particularly when cross-sectional imaging is negative for a mass lesion and clinical suspicion is high for neoplasia. Further prospective studies are needed to evaluate the role of EUS in this setting.

Neprilysin Inhibition and the Treatment of Heart Failure: Recent Steps in the Right Direction.

Numerous investigators have attempted to target the natriuretic peptide system in the treatment of heart failure since it was first described over 30 years ago. The history of neprilysin inhibition as a treatment for heart failure has been characterized by numerous setbacks. Recently, the PARADIGM-HF trial has shown favorable results, which may bring neprilysin inhibition into the mainstream of clinical practice. This article will review the history of the natriuretic peptide system and the investigations into it as a target for heart failure treatment, culminating in the positive results of the PARADIGM-HF trial, as well as planned and potential future directions for research.

Spatial genetic structure of the mountain pine beetle (Dendroctonus ponderosae) outbreak in western Canada: historical patterns and contemporary dispersal.

Environmental change has a wide range of ecological consequences, including species extinction and range expansion. Many studies have shown that insect species respond rapidly to climatic change. A mountain pine beetle epidemic of record size in North America has led to unprecedented mortality of lodgepole pine, and a significant range expansion to the northeast of its historic range. Our goal was to determine the spatial genetic variation found among outbreak population from which genetic structure, and dispersal patterns may be inferred. Beetles from 49 sampling locations throughout the outbreak area in western Canada were analysed at 13 microsatellite loci. We found significant north-south population structure as evidenced by: (i) Bayesian-based analyses, (ii) north-south genetic relationships and diversity gradients; and (iii) a lack of isolation-by-distance in the northernmost cluster. The north-south structure is proposed to have arisen from the processes of postglacial colonization as well as recent climate-driven changes in population dynamics. Our data support the hypothesis of multiple sources of origin for the outbreak and point to the need for population specific information to improve our understanding and management of outbreaks. The recent range expansion across the Rocky Mountains into the jack/lodgepole hybrid and pure jack pine zones of northern Alberta is consistent with a northern British Columbia origin. We detected no loss of genetic variability in these populations, indicating that the evolutionary potential of mountain pine beetle to adapt has not been reduced by founder events. This study illustrates a rapid range-wide response to the removal of climatic constraints, and the potential for range expansion of a regional population.