Functional Changes in the Stomach and Esophagus After One Anastomosis Gastric Bypass- OAGB

Inclusion Criteria:

• BMI> 35 kg/m2

• 2 years of controlled conservative obesity treatment without weight reduction

• patients should give their consent to participate in the study

Exclusion Criteria:

• Less than 2 years of conservative obesity treatment

• cancer

• cirrhosis Child-Pough score A

• Crohn's disease

• serious psychiatric disorder, which led to in-hospital treatment in psychiatricclinic in the past two years

• drug consumption

• non-compliance

• hiatal hernia > 4cm

• gastric pouch < 10cm

• Barett esophagus

• erosive esophagitis Grade C or D according to the Los Angeles Classification

• endoscopically proven gastric stricture

• acid exposition time > 6% (Lyon criteria)

• reflux episodes> 80 /24 hours (Lyon criteria)

• insufficient low esophageal sphincter according to manometry findings

• pathological findings in the impedance pH-metry (acid and non-acid reflux)