Effects of obesity, and of weight loss following bariatric surgery, on methylation of DNA from the rectal mucosa and in cell-free DNA from blood.

Background: DNA methylation is an epigenetic mechanism through which environmental factors including nutrition and inflammation influence health. Obesity is a major modifiable risk factor for many common diseases including cardiovascular diseases and cancer. In particular, obesity-induced inflammation resulting from aberrantly-methylated inflammatory genes may drive risk of several non-communicable diseases including colorectal cancer (CRC).

The role of damage control surgery in the treatment of perforated colonic diverticulitis: a systematic review and meta-analysis.

Introduction: Damage control surgery (DCS) is the classic approach to manage severe trauma and has recently also been considered an appropriate approach to the treatment of critically ill patients with severe intra-abdominal sepsis. The purpose of the present review is to evaluate the outcomes following DCS for Hinchey II-IV complicated acute diverticulitis (CAD).

Methods: A comprehensive systematic search was undertaken to identify all randomized clinical trials (RCTs) and observational studies, irrespectively of their size, publication status, and language.

Inherited pathogenic mitochondrial DNA mutations and gastrointestinal stem cell populations.

Inherited mitochondrial DNA (mtDNA) mutations cause mitochondrial disease, but mtDNA mutations also occur somatically and accumulate during ageing. Studies have shown that the mutation load of some inherited mtDNA mutations decreases over time in blood, suggesting selection against the mutation. However, it is unknown whether such selection occurs in other mitotic tissues, and where it occurs within the tissue.

Perforated sigmoid diverticulitis: Hartmann's procedure or resection with primary anastomosis-a systematic review and meta-analysis of randomised control trials.

Introduction: The surgical management of perforated sigmoid diverticulitis and generalised peritonitis is challenging. Surgical resection is the established standard of care. However, there is debate as to whether a primary anastomosis (PA) or a Hartmann's procedure (HP) should be performed.

Biomarkers of Colorectal Cancer Risk Decrease 6 months After Roux-en-Y Gastric Bypass Surgery.

Purpose: The impact of weight loss on obesity-related colorectal cancer (CRC) risk is not well defined. Previous studies have suggested that Roux-en-Y gastric bypass (RYGB) surgery may have an unexpected adverse impact on CRC risk. This study aimed to investigate the impact of RYGB on biomarkers of CRC risk.

A historical review of surgery for peritonitis secondary to acute colonic diverticulitis: from Lockhart-Mummery to evidence-based medicine.

The management of patients with colonic diverticular perforation is still evolving. Initial lavage with or without simple suture and drainage was suggested in the late 19th century, replaced progressively by the three-stage Mayo Clinic or the two-stage Mickulicz procedures. Fears of inadequate source control prompted the implementation of the resection of the affected segment of colon with formation of a colostomy (Hartman procedure) in the 1970's.

Changes in physical activity after bariatric surgery: using objective and self-reported measures.

Background: Many studies using self-reported physical activity (PA) assessment tools have suggested there is an increase in PA after bariatric surgery.

Objectives: Our aim was to assess PA and sedentary behavior before bariatric surgery and at 6 months after, using subjective and objective tools.

Setting: Bariatric surgery candidates were recruited from a single center.

Transanal Endoscopic Microsurgery (TEM) for Rectal Cancer: University Hospital of North Tees Experience.

Transanal endoscopic microsurgery (TEM) is a minimally invasive technique that is increasingly being used to treat early rectal cancer (T1/T2). We studied the outcomes of TEM for rectal cancer at our institution looking at the indication, recurrence rate, need for further radical surgery, 30-day and 12-month mortality and complication rate. We performed a retrospective analysis of prospectively collected data of cases between 2008 and 2012: 110 TEM procedures were performed during this period: 40 were confirmed rectal cancers and 70 were benign.

The Effects of Bariatric Procedures on Bowel Habit.

Background: Bariatric procedures are increasingly being used to combat the rising obesity epidemic. The aim of this study was to assess the effect of these interventions on bowel habit.

Methods: We recruited obese adults listed for a bariatric procedure.

Effect of vitamin C and vitamin E supplementation on endothelial function: a systematic review and meta-analysis of randomised controlled trials.

Randomised controlled trials (RCT) testing the effects of antioxidant supplements on endothelial function (EF) have reported conflicting results. We aimed to investigate the effects of supplementation with antioxidant vitamins C and E on EF and to explore factors that may provide explanations for the inconsistent results. We searched four databases (MEDLINE, Embase, Cochrane Library and Scopus) from inception until May 2014 for RCT involving adult participants aged ≥18 years who were supplemented with vitamins C and E alone or in combination for more than 2 weeks and reporting changes in EF measured using flow mediated dilation or forearm blood flow.

The effects of bariatric surgery on colorectal cancer risk: systematic review and meta-analysis.

Obesity is an established risk factor for colorectal cancer (CRC) but the effects of bariatric surgery on CRC incidence are uncertain. A systematic review of six electronic databases identified 3691 articles. Four observational studies met our inclusion criteria and results were pooled using a random effects model.