Pathogenesis of Non-alcoholic Steatohepatitis and Liver Regeneration After Bariatric Surgery (NALKOSTEP)

October 24, 2016 updated by: RWTH Aachen University

Pathogenesis of Non-alcoholic Steatohepatitis and Liver Regeneration After Bariatric Surgery / Untersuchung Der Pathogenese Der Nicht-alkoholischen Steatohepatitis Und Der Leberregeneration Nach Bariatrischer Chirurgie

Obesity and obesity related health problems are globally recognized as one of the major threats to public health. Bariatric surgery is the most effective and durable therapy option for obesity and the improvement of obesity related co-morbidities. "Non alcoholic steatohepatitis" (NASH) is an important comorbidity of obesity and improves after surgical intervention. In this study investigators try to enlighten the weight independent mechanism for the effects of bariatric surgery. Patients who are assigned to a bariatric procedure will be observed for at least 24 month. A liver and adipose tissue samples are gained during the operation. Liver function and morphology are observed before and after operation with LiMAx, FibroScan and ultrasound. Systemic inflammation is measured in blood samples before and after surgical intervention. In order to check the microbiome stool samples are collected throughout the entire observation period.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Procedure: Sleeve-Gastrectomy, Roux en Y gastric bypass

Detailed Description

Every patient who is scheduled for bariatric surgery in the university hospital Aachen will be evaluated for this study. After informed consent baseline measurements are performed preoperative. Baseline measurements involve blood and stool samples, LiMAx, FibroScan and ultrasound. During the operation a liver, a subcutaneous and visceral fat sample are taken to analyse liver histology and inflammation as well as fatty tissue signaling. After the operation patients are observed 24 month. Further blood samples are taken on the first postoperative day, 2 and 4 weeks, 3, 6, 12, 18 and 24 month after the operation. Stool samples are taken 2 and 4 weeks, 3, 6, 12, 18 and 24 month after the intervention. The LiMAx test, a test analysing the liver function, is performed 4 weeks, 6, 12 and 24 month after the operation. The morphologic liver structure is evaluated by FibroScan and ultrasound 4 weeks, 6, 12 and 24 month postoperative.

Study Type

Observational

Enrollment (Anticipated)

200

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Germany
- NRW
  - Aachen, NRW, Germany, 52074
    - Recruiting
    - Department of Surgery, University Hospital Aachen
    - Contact:
      
      Andreas Kroh, MD
      
      Phone Number: 35478 +49 (0)241 80
    - Principal Investigator:
      
      Andreas Kroh, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

BMI > 35 kg/m2 Age > 18 years

Description

Inclusion Criteria:

>18 years
scheduled for bariatric surgery
informed consent

Exclusion Criteria:

pregnancy
substance abuse
liver disease other than NASH

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Weight in kg Time Frame: 24 month	24 month

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
NAFLD (Non-alcoholic fatty liver disease) Activity Score (NAS) Time Frame: within 7 days after the operation	The NAS will be assessed by a trained pathologist in a liver sample which is taken during the operation. The NAS usually will be assessed within 7 days after the Operation. The NAS is the basis for further clinical and laboratory tests and follow-up.	within 7 days after the operation

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

RWTH Aachen University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

June 1, 2016

Primary Completion (Anticipated)

December 1, 2020

Study Completion (Anticipated)

December 1, 2022

Study Registration Dates

First Submitted

March 22, 2016

First Submitted That Met QC Criteria