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It has been known for some time that both foveal and peripheral visual acuity is higher for single letters than for letters in a row. Early work showed that this was due to the destructive interaction of adjacent contours (termed 'crowding' or contour interaction). It has been assumed to have a neural basis and a number of competing explanations have been(More)
BACKGROUND Barrett's oesophagus (BE) is a pre-malignant condition leading to oesophageal adenocarcinoma (OAC). Treatment of neoplasia at an early stage is desirable. Combined endoscopic mucosal resection (EMR) followed by radiofrequency ablation (RFA) is an alternative to surgery for patients with BE-related neoplasia. METHODS We examined prospective data(More)
AIMS (i) To determine the value of individual alarm features for predicting cancer in subjects referred to a rapid access upper gastrointestinal cancer service; and (ii) to develop a clinical prediction model for cancer and to prospectively validate this model in a further patient cohort. METHODS Patient demographics, referral indications, and subsequent(More)
OBJECTIVE To determine whether variation in gastroscopy rates in English general practice populations is associated with inequality in oesophagogastric (OG) cancer outcome. DESIGN Retrospective observational study of the Hospital Episode Statistics (HES) dataset for England (2006-2008) linked to death registration. METHODS were validated using(More)
INTRODUCTION Little is known about patients' perspectives on the amount of information they receive prior to diagnostic gastrointestinal endoscopies. Our unit's policy for obtaining consent consists of initially posting an information leaflet to the patient followed by subsequent explanation of the procedure on arrival for the test. The consent form is(More)
BACKGROUND AND STUDY AIM Mucosal neoplasia arising in Barrett's esophagus can be successfully treated with endoscopic mucosal resection (EMR) followed by radiofrequency ablation (RFA). The aim of the study was to compare clinical outcomes of patients with high grade dysplasia (HGD) or intramucosal cancer (IMC) at baseline from the United Kingdom RFA(More)
Radiofrequency ablation (RFA) is an accepted treatment for the eradication of dysplastic Barrett's esophagus (DBE) and residual Barrett's esophagus after endoscopic resection of intramucosal adenocarcinoma. Circumferential balloon-based and focal catheter-based RFA devices are currently used (the Halo360 and Halo90). However, a new smaller focal ablation(More)
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