Gastric Volumetry by Gastric Tomodensitometry With Gas (VOLUSCAN)

Civil Hospices of Lyon

Status

Completed

Conditions

Morbid Obesity

Treatments

Device: gastric tomodensitometry with gas at 3 months and 12 months

Study type

Interventional

Funder types

Other

Identifiers

NCT01963637

2012.721

2012-A00591-42 (Other Identifier)

Details and patient eligibility

About

The Gastric bypass (GBP) is actually one of the most performed bariatric procedures worldwide. Short term results report 67% of mean Excess Weight Loss (EWL) at 2 years, and 58% EWL at 5 years. Sleeve gastrectomy (SG) which is a restrictive procedure has gained in popularity because of its technical simplicity and its efficiency (60% EWL at 1 year and 48% over 4 years). However, failures are observed because of insufficient weight loss or early weight regain. Several hypotheses have been proposed to explain these failures, such as the size of the gastric pouch that could be correlated to weight evolution.

Purpose of the study Taking the hypothesis that a progressive dilatation of the gastric pouch is one of the main factors of weight loss failure after GBP or SG due to the loss of its restrictive function, the aim of our study is to measure these gastric volumes using gastric tomodensitometry with gas, a new reliable,precise and 3 dimension radiological technique. The investigators will try to identify a positive correlation between gastric dilatation and weight regain.

Methods This is a 2 year interventional, prospective, monocentric study with longitudinal follow-up. Forty-five obese patients (BMI>40kg/m²) eligible for primary GBP (n=25) or SG (n=20) will be included. Gastric volumes will be measured by gastric tomodensitometry with gas at 3 and 12 month after surgery. In the GBP group, the investigators will measure the gastric pouch volume, the candy cane Roux limb volume, the neostomach volume (= gastric pouch+candy cane Roux limb) and the gastro-jejunal anastomosis diameter. In the SG group, the investigators will measure the volume of the gastric tube, of the non resectedantrum, of the whole residual stomach and the gastric tube diameter at the middle of the small curvature. Volume variations between 3 and 12 months will be compared to the EWL and to clinical and metabolic data (HbA1c, Insulinemia, HOMA index, liver steatosis). A 30% dilatation of the neostomach at 12 months will be considered as significant. Reinhold's criteria will be used to define surgical failure: EWL<50% at 12 months. Weight regain will be considered as significant if the weight reached at 12 months is higher than the minimum weight obtained. Gastric volume variation, EWL and BMI evolution between the 3rd and the 12th month will be analysed in the whole population and in each group (GBP and SG) with a Wilcoxon test.

Expected benefits If the investigators valid the hypothesis that the dilatation of the neostomach is an essential factor in weight regain after GBP and SG, the benefit for the patient will be dual: 1/ validate the prognostic value of gastric volumetry by gastric tomodensitometry with gas in order to explain weight regain, and in order to use it as a standard. 2/ the identification of specific risk factors related to the surgical procedure could result in surgical technique improvements as well as a better adaptation of revisional procedures, in order to improve treatment of recurrent obesity.

Enrollment

46 patients

Sex

All

Ages

18 to 60 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Patients of both genders, with morbid obesity (BMI > or = 40kg / m ²)
Age included between 18 and 60 years
Patient who requires a gastric bypass or a Sleeve gastrectomy as a 1st bariatric procedure. Indication validated in pluridisciplinary concertation meeting for bariatric surgery
No previous history of bariatric surgery
Free and informed consent signed
Being affiliated to a French social security system or similar.

Exclusion criteria

Bariatric surgery with metabolic aim (BMI < 40kg / m ²)
Patients with a history of bariatric surgery, after failure of one or several previous procedures
Contraindication to radiation exposition: current or planned pregnancy during the study
prostate adenoma : contraindication to antispasmodic
Known allergy to effervescent salts or butylscopolamine (Scoburen)
Glaucoma
Inability to express a consent
Unaffiliated patients to a French national insurance
Patients with Pacemaker
Patients already enrolled in a study with a conflict of interest with this study.