Active clinical trials for "Obesity, Morbid"

To investigate: Associations between miRNA and insulin signaling-related gene expressions in abdominal adipose tissues in obese subjects. Differences in miRNAs expressed by intrabdominal omental adipose tissues between genders.

Excess visceral fat is a key factor in the development of metabolic syndrome associated with obesity. After bariatric surgery, patients experience weight loss accompanied by a decrease in the amount of total body fat. It is unclear how the different surgical procedures vary in their effect on the visceral and subcutaneous fat change. Ultrasonography (US) is an effective, efficient method in assessing this metabolically active layer of fat even when compared with gold standard techniques such as computed tomography and magnetic resonance imaging. Only a few studies managed to show the actual decrease in the visceral fat layer after these kinds of surgeries. The aim is to compare by ultrasound evaluation the extent of fat layers reduction after laparoscopic adjustable gastric banding (LAGB), laparoscopic sleeve gastrectomy (LSG) and laparoscopic roux-en-y gastric bypass (LRYGB). The hypothesis is that the sleeve gastrectomy and gastric bypass being not only a restrictive procedure but also a malabsorptive procedure will have the best results in decreasing the amount of visceral fat.

This is a short term study of the effects of bariatric surgery on body composition, gait parameters during walking, lower extremity joint pain and quality of life (QOL) in morbidly obese patients who are already scheduled for a bariatric surgical procedure.

The purpose of this study is to quantify the relative contribution of improved insulin sensitivity and improved insulin secretion to the glycaemic effect of bariatric surgery.

The purpose of this research is to further study the effect weight loss after gastric bypass surgery has on the heart and blood pressure and on how the body uses or metabolizes the sugars, fats and proteins we eat. Additionally, the researchers want to study fat tissue for gene patterns which may be responsible for where we carry fat on our bodies, as well as look carefully at a possible link between adipose tissue and insulin resistance. The researchers also want to evaluate the liver for the presence of fatty liver, which is common in people with obesity and is associated with insulin resistance, as well as study the liver for gene patterns which may be associated with non-alcoholic liver disease. Evaluating cardiovascular function and endocrine function before and after gastric bypass surgery, as well as studying adipose and liver tissue may help us understand the link between obesity, insulin resistance, fatty liver disease, high blood pressure and health problems such as diabetes and heart disease. Consequently, this may help in the future by identifying those who will benefit most from gastric bypass surgery.

The goal of the LABS-1 study is to assess the short-term safety of bariatric surgery.

single-center study carried out in order to evaluate in prospective among patients seen or treated in the pediatric endocrinology unit and multidisciplinary management of obesity, the potential number of patients eligible for surgery.

Study of the impact of weight loss induced by surgery (interventional group) or optimal nutritional management (control group) on sexual function in men with severe obesity

An important step during a gastric bypass operation for the treatment of morbid obesity is the measuring of the small bowel length. At several reoperations we found a length increase of the lowest part of the small intestine of up to 80% compared to the measured length at the initial operation. On the one hand, this reflects a normal technical error of small bowel measuring due to the variable state of contraction of the bowel, but on the other hand, it could also be due to a compensatory increase in intestinal length after the operation. New protocols allow measuring of the small bowel length by MRI. Comparing the preoperative and later on several postoperative measurements by MRI with the initial intraoperative length measuring should allow to validate the new MRI protocol and in the same time quantify the eventual small bowel length increase. We plan to include 20 patients in this study.

The relation between obesity and ischemic heart disease (IHD) is under considerable debate. The reduction in all-cause mortality and, more specifically, the reduction in cardiac-related mortality seen after weight-loss surgery, may be due to regression or slowing developement of subclinical IHD. Function of cells lining the arteries (endothelium) is closely related to the state of IHD and its measurement can serve as a surrogate marker for the existence and severity of IHD. The investigators hypothesize that the prevalence of undiagnosed IHD in the morbidly obese population is high and that following surgery for weight reduction there is a halt in the progression, or even a regression in its severity. The study includes measurement of endothelial function before and after weight-reducing surgery.