One hundred and fifteen patients with symptoms suggestive of irritable bowel syndrome (IBS) according to Rome III criteria and 209 patients with gastrointestinal symptoms different from IBS (control) were identified through medical records from the Gastroenterology Clinic of the "Dr. Manuel Gea Gonzalez General Hospital" from January 2008 to March 2010. No statistical differences in IBS data as compared with control groups were observed except in bloating, that was more frequent in the IBS group (P = 0.043). Although the pathogenicity of specific intestinal protozoa could not be demonstrated due to lack of association with the development of gastrointestinal symptoms, Blastocystis spp, in the IBS group, exhibited a trend of association to diarrhoea (odds ratio = 2.73, 95% confidence interval = 0.84-8.80, P = 0.053), while having any parasite and diarrhoea was significant (odds ratio = 3.38, 95% confidence interval = 1.33-8.57, P = 0.008). The association between Blastocystis and diarrhoea in IBS patients although not conclusive is an interesting finding; nonetheless more extensive case-controlled studies are required to clearly define the role of some "non-pathogenic" parasites in intestinal disease and IBS.

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Laparoscopic Y Roux gastric bypass (YRGB) is the most performed bariatric surgery. There are 3 main techniques in the construction of the gastrojejunostomosis (GJA). The size of the GJA and its relation to the reduction of excess weight has been previously debated. The aim of our study was to determine whether the GJA area in YRGB correlates with the loss of excess weight at 1 year postoperatively. Patients who complied 1 year after YRGB underwent an upper gastrointestinal endoscopy. Images of the GJA were obtained and the area of the GJA was calculated. A statistical analysis, adjusting for age and body mass index preoperatively obtained an r of -0474 and P=0.032, demonstrating a significant negative correlation between the GJA area and the percentage of excess weight loss. A statistically significant negative correlation between the GJA area and the percentage of the excess weight loss was shown. The number of patients evaluated should be increased for a higher statistical significance to corroborate whether the stoma size influences the loss of weight in YRGB patients.

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