Laparoscopic Gastric Bypass Versus Laparoscopic Banded Gastric Bypass Randomized Prospective Clinical Trial

2016-10-21 04:08:21 | BioPortfolio


This study try to identify differences in length of operation, weight loss and complications, between two different bariatric surgical techniques, the laparoscopic Roux-en-Y gastric bypass and the laparoscopic Roux-en-Y banded gastric bypass. The study will be conducted in a Spanish public health system hospital. The patients of the trial will have the preoperative studies, hospital treatment during the admission, postoperative treatment and follow up as any other patient included in the hospital bariatric surgery program. The study cases will have placed around the gastric pouch a band of polypropylene mesh, and will be randomly choose between the participants.

Patients will be randomized in a 5/3 (study/control) ratio.


One group of patients of the study will have done the simplified laparoscopic gastric bypass, with a vertical gastric pouch of about 20 ml, a 150 cm Roux-en-Y limb constructed in an antegastric antecolic fashion, and a biliary limb of 100 cm. Anastomosis will be done with endoscopic surgical linear stapler, closing the apertures with continuous absorbable running sutures. The Petersen space and the mesenteric defect will be closed with non-absorbable sutures.

The other group of patients will have performed the laparoscopic Roux-en-Y banded gastric bypass. This technique is identical to the one performed in the other group, but differs in that a polypropylene mesh (10x65 mm) is placed 15 mm proximal to the anastomosis around the gastric pouch, and the gastric pouch is about 15 mm longer.

The investigators randomly assigned 50 patients to the study group (Laparoscopic Roux-en-Y banded gastric bypass) and 30 to the control group (Laparoscopic Roux-en-Y gastric bypass) , n=80, and were also blinded to the surgeon until surgery.

One of the methods is basically the same than the other, but for the placement of the polypropylene mesh around the gastric pouch above the anastomosis, and patient series with Laparoscopic Roux-en-Y banded gastric bypass showed long term better weight loss than other series with not banded gastric bypass, thus it is expected a difference in long term weight loss between groups.

Fisher Test will be used for the statistical analysis, assuming a risk of 0.05 and a statistical power of 90%.

Sample size is calculated considering bibliographic long term weight loss in both groups, which is 82% in the banded group versus 63% in the not banded group. Thus sample size (n): 67, and adjust by loss sample size: 79 (10% expected loss ratio), not being necessary a 1: 1 ratio between cases and controls and requiring no more than 25 controls, A sample size of 50 cases and 30 controls, total n = 80, will be used.

The method of randomization was concealed envelopes.

Study Design

Allocation: Randomized, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject), Primary Purpose: Treatment


Morbid Obesity


Banded (with polypropylene mesh) gastric bypass, Gastric bypass


Servicio de Cirugía General. Hospital Universitario Puerta de Hierro Majadahonda




Puerta de Hierro University Hospital

Results (where available)

View Results


Published on BioPortfolio: 2016-10-21T04:08:21-0400

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Medical and Biotech [MESH] Definitions

Coronary artery bypass surgery on a beating HEART without a CARDIOPULMONARY BYPASS (diverting the flow of blood from the heart and lungs through an oxygenator).

Surgical procedure in which the STOMACH is transected high on the body. The resulting small proximal gastric pouch is joined to any parts of the SMALL INTESTINE by an end-to-side SURGICAL ANASTOMOSIS, depending on the amounts of intestinal surface being bypasses. This procedure is used frequently in the treatment of MORBID OBESITY by limiting the size of functional STOMACH, food intake, and food absorption.

Abnormal distention of the STOMACH due to accumulation of gastric contents that may reach 10 to 15 liters. Gastric dilatation may be the result of GASTRIC OUTLET OBSTRUCTION; ILEUS; GASTROPARESIS; or denervation.

Vagal denervation of that part of the STOMACH lined with acid-secreting mucosa (GASTRIC MUCOSA) containing the GASTRIC PARIETAL CELLS. Since the procedure leaves the vagal branches to the antrum and PYLORUS intact, it circumvents gastric drainage required with truncal vagotomy techniques.

A procedure consisting of the SURGICAL ANASTOMOSIS of the proximal part of the JEJUNUM to the distal portion of the ILEUM, so as to bypass the nutrient-absorptive segment of the SMALL INTESTINE. Due to the severe malnutrition and life-threatening metabolic complications, this method is no longer used to treat MORBID OBESITY.

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