Publications by authors named "Simon Dexter"

Background: For patients in whom laparoscopic adjustable gastric band has failed, conversion to Roux-en-Y gastric bypass and laparoscopic sleeve gastrectomy are both options for further surgical treatment. There are limited data comparing these 2 procedures. The National Bariatric Surgery Registry is a comprehensive United Kingdom-wide database of bariatric procedures, in which preoperative demographic characteristics and clinical outcomes are prospectively recorded.

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Background: The National Bariatric Surgery Registry (NBSR) is the largest bespoke database in the field in the United Kingdom.

Objectives: Our aim was to analyze the NBSR to determine whether the effects of obesity surgery on associated co-morbidities observed in small randomized controlled clinical trials could be replicated in a "real life" setting within U.K.

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Giant fibrovascular polyps of the esophagus are rare benign tumors arising from the cervical esophagus or hypopharynx. Radiologic and endoscopic investigation may struggle to identify a stalk or to delineate the tumor as luminal or submucosal in origin. Excision is advised, although the diagnosis, and therefore the optimal operative approach, may not be apparent until the time of operation.

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Background: Severe, drug-resistant gastroparesis is a debilitating condition. Several, but not all, patients can get significant relief from nausea and vomiting by gastric electrical stimulation (GES). A trial of temporary, endoscopically delivered GES may be of predictive value to select patients for laparoscopic-implantation of a permanent GES device.

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Objective: The hypothesis that sleeve gastrectomy (SG) is not associated with an increase in mucosal colorectal cancer (CRC) biomarkers, unlike Roux-en-Y gastric bypass (RYGB), was tested.

Design And Methods: Rectal mucosa, blood, and urine were obtained from morbidly obese patients (n = 23) before and after (median 28 months) SG, as well as from nonobese controls (n = 20). Rectal epithelial cell mitosis and apoptosis, crypt size/fission, and pro-inflammatory gene expression were measured, as well as systemic inflammatory biomarkers, including C-reactive protein (CRP).

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Background: Laparoscopic sleeve gastrectomy (LSG) has rapidly gained popularity as a definitive bariatric procedure despite the sparse long-term follow-up data. On the basis of extensive experience with the open Magenstrasse and Mill operation, we began practice of LSG in 2000. The objective of the present study was to analyze 8-9 years of our follow-up data for LSG at a university hospital in the United Kingdom.

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Background: This study aimed to evaluate the role of the Obesity Surgery Mortality Risk Score (OS-MRS) to predict the risk of post-operative adverse events, in addition to death, from any laparoscopic bariatric procedure.

Methods: The OS-MRS was applied to consecutive patients at a single hospital during October 2008-September 2009. The composite end point comprised one or more of the following adverse events: mortality, re-intervention, re-admission to hospital, venous thromboemobolism, or blood transfusion.

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We describe a case of esophageal perforation following blunt chest trauma with delayed presentation as paraplegia secondary to spinal epidural abscess formation. The case highlights the importance of the awareness of the possibility of esophageal injury in patients following road traffic collisions.

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Introduction: Laparoscopic vagal preserving oesophagectomy is a recognised treatment option for high-grade dysplasia of the oesophagus. A jejunal interposition, as described by Alvin Merendino in 1955, aims to substitute the lower oesophageal sphincter, thereby treating physiological disorders such as reflux oesophagitis.

Methods: We aimed to combine these procedures in the treatment of an otherwise healthy patient, who presented with high-grade dysplasia on surveillance endoscopy, with particular reference to technical feasibility and to Quality of Life as assessed by the Gastrointestinal Quality of Life Index (GIQLI).

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Background: In the UK, it is standard practice to treat esophageal adenocarcinoma with neoadjuvant chemotherapy (no radiation) and surgery. We examined the prognostic value of the status of the circumferential resection margin (CRM) and stratification of the N1 category into 1-4 nodes or > or = 5 nodes.

Methods: Between 2000 and 2006, 105 patients with radiologically staged T3, T4 or N1 esophageal adenocarcinoma had preoperative chemotherapy.

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Introduction: This study compared pathological characteristics and patterns of disease recurrence for patients with pT1 esophageal adenocarcinoma treated with either laparoscopic transhiatal esophagectomy or open esophagectomy.

Methods: From January 2000-December 2006, 44 patients had pT1 esophageal adenocarcinoma after esophagectomy. No patients had neoadjuvant treatment.

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Background: Obesity predisposes to incisional herniation and increased the incidence of recurrence after conventional open repair. Only sparse data on the safety and security of laparoscopic ventral hernia repair (LVHR) for morbidly obese patients are available. This study compared the incidence of perioperative complications and early recurrence after LVHR between morbidly obese and non-morbidly obese patients.

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Background: Leakage is a serious complication of esophagectomy and is historically associated with high mortality. This study aimed to describe the morphology and strategies for clinical management of leakage after esophagectomy.

Study Design: A database prospectively maintained from July 2002 to July 2005 at a referral unit for foregut cancer was used to identify patients with leakage of saliva or gastrointestinal contents after esophagectomy and reconstruction with stomach.

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Background: Barrett's esophagus is generally accepted to be a premalignant condition. Previous studies have suggested the use of methylene blue (MB) chromoendoscopy to aid the identification of dysplasia in Barrett's esophagus surveillance programs, but a recent study has raised the concern that MB might induce oxidative damage of DNA.

Objective: The aim of this study was to compare MB directed biopsies (MBDB) with our current standard, which is random 4 quadrant biopsies (RB).

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Hypothesis: High-grade dysplasia (HGD) of the gastric epithelium is associated with high prevalence of invasive carcinoma, and distinction by endoscopic biopsy is difficult.

Design: Cohort study, 1996 to 2003.

Setting: Tertiary care center.

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Esophageal adenocarcinoma develops on a background of Barrett's esophagus. A number of risk factors have been linked to both conditions, including gastroesophageal reflux and smoking. However, the molecular mechanisms by which these factors influence disease progression remain unclear.

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Two staging systems for gastric cancer, International Union Against Cancer (UICC)/TNM and the Japanese classification, have been used widely for clinical practice and research. The two systems started independently in the 1960s, and underwent several revisions and amendments in order to approach each other, but have become more divergent in the latest editions because of characteristics based on different philosophies. The TNM system adopted a number-based system for N-staging that provides easy and accurate prognostic stratification.

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