Can Pre-operative Lean Mass Predict Weight Loss After Roux-en-Y Gastric Bypass? (FLAG)
The goal of this observational study is to evaluate whether preoperative fat-free mass predicts post-operative weight loss in patients undergoing Roux-En-Y gastric bypass. The primary objective of this study is to evaluate whether preoperative fat-free mass predicts weight loss in the two years following RYGB.
The investigators will collect the following data, assessed as part of routine follow-up:
- height, weight, hip and waist circumferences
- body composition by bioimpedance analysis and dual energy-X-ray absorptiometry
- Muscle strength and physical activity
- Nutritional parameters: resting energy expenditure, eating behavior and digestive tolerance", plasma micronutrient status. .
- Cardiovascular risk factors: fasting glucose, blood levels of Hb1Ac, triglycerides, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, blood pressure
- Co-morbidities: joint pain and arthritis, sleep apnea, gastro-oesophageal reflux, metabolic dysfunction-associated fatty liver disease (MAFLD), cancer, stroke, heart attack.
Quality of life: quality of life by the "Bariatric Analysis and Reporting Outcome (BAROS) questionnaire", symptoms of dumping syndrome by the "Sigstad diagnostic score system" Birthdate, birthweight and term of their children
Przegląd badań
Status
Status
Warunki
Warunki
Szczegółowy opis
This study is prospective but the investigators will also use the retrospective data of the patients who underwent bariatric surgery before the acceptance of the study, with their informed consent.
The investigators will collect the following data, assessed as part of routine follow-up:
Preoperatively:
- medical history
- height, weight, hip and waist circumferences
- body composition by bioimpedance analysis (BIA) and dual energy-X-ray absorptiometry (DXA)
- handgrip strength
- sarcopenia questionnaire (SARC-F)
- physical activity questionnaire (IPAQ)
- resting energy expenditure by indirect calorimetry
- eating behaviour: duration of meals, hyperphagia, snacking, compulsions, and cognitive restrictions as variables dichotomized as yes or no, and hunger and satiety each through a visual analogue scale, where 0 corresponds to "no hunger or good satiety" and 10 to "big hunger or no satiety"
- digestion symptoms: frequency of vomiting and of bowel movements
- Binge eating questionnaire
- blood pressure
- blood sample
- co-morbidities
- results of liver ultrasound, gastric endoscopy
- quality of life questionnaire (BAROS), Dumping questionnaire (Sigstad)
- blood and tissue biobanking
These assessments will be repeated after surgery at the frequency indicated below:
- at month 1: all tests except DXA, sarcopenia questionnaire (SARC-F), physical activty assessment (IPAC), binge eating questionnaire, liver ultrasound and gastric endoscopy, quality of life and dumping questionnaire, blood and tissue biobank
- At month 3: all tests except DXA, binge eating questionnaire, dumping, questionnaire, and only if indicated for clinical routine, liver ultrasound and gastric endoscopy.
- At month 6: all tests except DXA, sarcopenia questionnaire (SARC-F), physical activty assessment (IPAC), binge eating questionnaire, quality of life questionnaire, and only if indicated for clinical routine, liver ultrasound and gastric endoscopy, only if indicated in clinical routine, blood and tissue biobank.
- At year 1, 2, 3, 4 and 5: all tests except liver ultrasound and gastric endoscopy only if indicated in clinical routine
- At year 1.5: all tests except DXA, sarcopenia questionnaire (SARC-F), blood and tissue biobank
Study sample calculation:
The investigators hypothesized, in a conservative way and based on available litterature, that the patients will decrease their lean mass by 5±10 kg within 2 years after RYGB. A sample size of 32 achieves 90% power to detect a mean of paired differences of 5 kg with an estimated standard deviation of paired differences of 10.0 and with a significance level (alpha) of 0.050 using a two-sided paired t-test.
The investigators plan to evaluate whether preoperative FFM (independent variable) predicts weight loss (dependent variable) while adjusting for age, sex, preoperative BMI category (35-40, 40-50, > 50), and FM, physical activity. This corresponds to 6 adjustment variables altogether, or 3 supplemental variables. According to the rule of Harrel that stipulates at least 10 observations per independent variables, the investigators need at least 70 participants (10*(1+6)) to perform these adjustments.
Considering a drop-out rate of 30% at 2 years, the investigators will need a sample size of: 70+30% = 91 subjects.
Typ studiów
Typ studiów
Zapisy (Szacowany)
Zapisy
Kontakty i lokalizacje
Kontakt w sprawie studiów
Kontakt w sprawie studiów
- Nazwa: Laurence Genton, MD
- Numer telefonu: 0041 79 553 34 84
- E-mail: laurence.genton@hug.ch
Kopia zapasowa kontaktu do badania
- Nazwa: Laure Wilmart-Beck
- Numer telefonu: 0041 22 372 93 49
- E-mail: laure.wilmart@hug.ch
Lokalizacje studiów
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-
Canton of Geneva
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Geneva, Canton of Geneva, Szwajcaria, 1205
- Rekrutacyjny
- Geneva University Hospitals
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Kryteria uczestnictwa
Kryteria kwalifikacji
Kryteria kwalifikacji
Wiek uprawniający do nauki
- Dziecko
- Dorosły
- Starszy dorosły
Akceptuje zdrowych ochotników
Metoda próbkowania
Badana populacja
Opis
Inclusion Criteria:
- Patients ≥ 18 years AND
- Meeting inclusion criteria for RYGB (www.smob.ch): BMI ≥35 kg/m2, failure of weight-reducing programs over 2 years (for patients with a BMI ≥50 kg/m2, 1 year), understanding of the necessity to change the lifestyle and eating habits post-operatively, signed consent for lifelong post-operative follow-up in a recognized bariatric center AND
- Scheduled RYGB at the HUG OR previous RYGB at the HUG with a present follow-up in Clinical Nutrition and dietetics at the HUG AND
- Understanding French
Exclusion Criteria:
- Inability or refusal to give consent.
- Planification for another type of bariatric surgery than RYGB
- Contra-indications to bariatric surgery as stated under www.smob.ch: insufficient nutritional knowledge in nutrition to lose weight, pregnancy, kidney failure (Creatinine ≥ 300 umol/l without dialysis, Crohn's disease, active cancer or remission < 2 years, active psychiatric disease, substance abuse (alcohol, cannabis, opioids), absence of compliance, lack of understanding of the requirements and necessary lifestyle changes reported by physician or dietician.
Plan studiów
Jak projektuje się badanie?
Szczegóły projektu
Liczba grup / kohort
Kohorty i interwencje
Grupa / KohortaGrupa / Kohorta |
|---|
|
Patients with scheduled RYGB at the Geneva University Hospitals
Morbidly obese patients scheduled for Roux-en-Y gastric bypass
|
Co mierzy badanie?
Podstawowe miary wyniku
Podstawowe miary wyniku
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
|
Correlation between Fat-free mass (FFM) and weight loss following RYGB
Ramy czasowe: 2 years
|
FFM and lean body mass measurement using BIA and DXA, respectively
|
2 years
|
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Evolution of body composition in the two years after bariatric surgery
Ramy czasowe: 5 years
|
Measurments of body composition by dual energy X-ray absorptiometry before gastric bypass and yearly after gastric bypass
|
5 years
|
Współpracownicy i badacze
Sponsor
Sponsor
Daty zapisu na studia
Główne daty studiów
Rozpoczęcie studiów (Rzeczywisty)
Rozpoczęcie studiów
Zakończenie podstawowe (Szacowany)
Zakończenie podstawowe
Ukończenie studiów (Szacowany)
Ukończenie studiów
Daty rejestracji na studia
Pierwszy przesłany
Pierwszy przesłany
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy wysłany (Rzeczywisty)
Pierwszy wysłany
Aktualizacje rekordów badań
Ostatnia wysłana aktualizacja (Rzeczywisty)
Ostatnia wysłana aktualizacja
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia weryfikacja
Ostatnia weryfikacja
Więcej informacji
Terminy związane z tym badaniem
Słowa kluczowe
Dodatkowe istotne warunki MeSH
Inne numery identyfikacyjne badania
Inne numery identyfikacyjne badania
- 2024-02136
Plan dla danych uczestnika indywidualnego (IPD)
Planujesz udostępniać dane poszczególnych uczestników (IPD)?
Informacje o lekach i urządzeniach, dokumenty badawcze
Bada produkt leczniczy regulowany przez amerykańską FDA
Bada produkt urządzenia regulowany przez amerykańską FDA
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