The Link Between Obesity And Vitamin D in Bariatric Patients With Omega-loop Bypass Surgery (LOAD)
The Link Between Obesity And Vitamin D in Bariatric Patients With Omega-loop Bypass Surgery: a Randomized Controlled, Double-blinded Clinical Supplementation Trial
Studieoversigt
Status
Status
Betingelser
Betingelser
Intervention / Behandling
Intervention / Behandling
Undersøgelsestype
Undersøgelsestype
Tilmelding (Faktiske)
Tilmelding
Fase
Fase
- Fase 4
Kontakter og lokationer
Studiesteder
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Vienna, Østrig, 1090
- Medical University of Vienna
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Deltagelseskriterier
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- Planned omega loop bypass surgery
- 25-hydroxy vitamin D < 75 nmol/l
- BMI >40 or ≥35 kg/m2 with co-morbidities e.g. diabetes mellitus, hypertension
- Body weight <140 kg (due to limitation of DEXA measurement)
- Capability to consent
Exclusion Criteria:
- Another planned form of bariatric surgery
- Hypercalcemia (calcium >2.63 mmol/l) or hypocalcemia (<1.75 mmol/l)
- Renal insufficiency (creatinine >133 μmol/l or GFR <50 ml/min)
- Primary hyperparathyroidism
- Malignancy
- Infection e.g. human immunodeficiency virus
- Medical conditions requiring daily calcium supplements or antacid use
- Known hypersensitivity to cholecalciferol
- No capability to consent
- Imprisoned persons
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Firedobbelt
Antal våben
Våben og indgreb
Deltagergruppe / ArmDeltagergruppe / Arm |
Intervention / BehandlingIntervention / Behandling |
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Aktiv komparator: Intervention
The loading dose of 300 000 IU is divided into three doses (100 000 IU) and will be given over the first months.
All patients in the intervention group will receive the first loading dose of 100 000 IU at day of discharge.
The second (2 weeks) and third (4 weeks postoperative) administration will be given based on the 25-hydroxy vitamin D concentration.
After the last respectively third loading dose a maintenance dose of 3420 IU per day should maintain the high 25-hydroxy vitamin D concentration.
It should be administered for up to 46 weeks (until follow-up visit)
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Placebo komparator: Placebo
The placebo loading dose (oil) is divided into three administrations and will be given over the first months.
All patients in the placebo group will receive the first placebo loading dose at day of discharge.
After the last placebo loading dose a maintenance dose of 3420 IU per day should maintain the 25-hydroxy vitamin D concentration.
It should be administered for up to 46 weeks (until follow-up).
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Hvad måler undersøgelsen?
Primære resultatmål
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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25-hydroxy vitamin D levels
Tidsramme: 24 weeks postoperatively
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25-hydroxy vitamin D levels after 24 weeks measured in intervention and placebo group, adjusting for the baseline value as covariate
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24 weeks postoperatively
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Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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Prevalence of sufficient vitamin D
Tidsramme: 24 weeks postoperatively
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Number of patients reaching 25-hydroxyvitamin D levels above 75 nmol/l
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24 weeks postoperatively
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Prevalence of vitamin D deficiency
Tidsramme: 24 weeks postoperatively
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Prevalence of vitamin D deficiency
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24 weeks postoperatively
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Co-morbidities
Tidsramme: 24 weeks postoperatively
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Prevalence of Co-morbidities
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24 weeks postoperatively
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Prescribed medication
Tidsramme: 24 weeks postoperatively
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Change in prescribed medication
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24 weeks postoperatively
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Body weight, body composition
Tidsramme: 24 weeks postoperatively
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Change in body weight and body composition by bioelectrical impedance analysis
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24 weeks postoperatively
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Blood pressure
Tidsramme: 24 weeks postoperatively
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Change of vital signs (blood pressure)
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24 weeks postoperatively
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Laboratory parameters
Tidsramme: 24 weeks postoperatively
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Change in laboratory parameters compared to baseline: vitamin D status, bone turnover markers, calcium homeostasis, parathyroid hormone, inflammation, insulin resistance
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24 weeks postoperatively
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Depression symptoms
Tidsramme: 24 weeks postoperatively
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Prevalence of depression symptoms assessed by Beck Depression Inventory Questionnaire
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24 weeks postoperatively
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Bone mineral density and body fat content
Tidsramme: 24 weeks postoperatively
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Assessment of bone mineral density and total body fat content by DEXA
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24 weeks postoperatively
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Liver condition
Tidsramme: 24 weeks postoperatively
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Measurement of liver stiffness and fat content by FibroScan and CAP
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24 weeks postoperatively
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Dietary assessment
Tidsramme: 24 weeks postoperatively
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Dietary assessment will be documented with a 5-day food record to calculate vitamin D intake and the Mediterranean Score (questionnaire with calculated score)
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24 weeks postoperatively
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Gut microbiota composition
Tidsramme: 24 weeks postoperatively
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Association between vitamin D, gut microbiota and surgery-induced weight loss, by collecting stool samples
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24 weeks postoperatively
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Vitamin D in adipose and liver tissue
Tidsramme: during surgery
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For instance, for the purposes of describing adipose depot vitamin D concentrations and expression of enzymes in subcutaneous, visceral adipose and liver tissue samples will be collected during the omega loop gastric bypass surgery.
Furthermore, the liver tissue samples should be used in addition for a histological examination as extended diagnostics (NAFLD/ NASH).
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during surgery
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Samarbejdspartnere og efterforskere
Sponsor
Sponsor
Efterforskere
Efterforskere
- Ledende efterforsker: Bernhard Ludvik, M.D., Division of Endocrinology & Metabolism, Department of Internal Medicine III, Medical University of Vienna
Publikationer og nyttige links
Generelle publikationer
- Kruschitz R, Wakolbinger M, Schindler K, Prager G, Hoppichler F, Marculescu R, Ludvik B. Effect of one-anastomosis gastric bypass on cardiovascular risk factors in patients with vitamin D deficiency and morbid obesity: A secondary analysis. Nutr Metab Cardiovasc Dis. 2020 Nov 27;30(12):2379-2388. doi: 10.1016/j.numecd.2020.08.011. Epub 2020 Aug 20.
- Luger M, Kruschitz R, Winzer E, Schindler K, Grabovac I, Kainberger F, Krebs M, Hoppichler F, Langer F, Prager G, Marculescu R, Ludvik B. Changes in Bone Mineral Density Following Weight Loss Induced by One-Anastomosis Gastric Bypass in Patients with Vitamin D Supplementation. Obes Surg. 2018 Nov;28(11):3454-3465. doi: 10.1007/s11695-018-3353-2.
- Luger M, Kruschitz R, Kienbacher C, Traussnigg S, Langer FB, Prager G, Schindler K, Kallay E, Hoppichler F, Trauner M, Krebs M, Marculescu R, Ludvik B. Vitamin D3 Loading Is Superior to Conventional Supplementation After Weight Loss Surgery in Vitamin D-Deficient Morbidly Obese Patients: a Double-Blind Randomized Placebo-Controlled Trial. Obes Surg. 2017 May;27(5):1196-1207. doi: 10.1007/s11695-016-2437-0.
- Luger M, Kruschitz R, Kienbacher C, Traussnigg S, Langer FB, Schindler K, Wurger T, Wrba F, Trauner M, Prager G, Ludvik B. Prevalence of Liver Fibrosis and its Association with Non-invasive Fibrosis and Metabolic Markers in Morbidly Obese Patients with Vitamin D Deficiency. Obes Surg. 2016 Oct;26(10):2425-32. doi: 10.1007/s11695-016-2123-2.
- Luger M, Kruschitz R, Marculescu R, Haslacher H, Hoppichler F, Kallay E, Kienbacher C, Klammer C, Kral M, Langer F, Luger E, Prager G, Trauner M, Traussnigg S, Wurger T, Schindler K, Ludvik B. The link between obesity and vitamin D in bariatric patients with omega-loop gastric bypass surgery - a vitamin D supplementation trial to compare the efficacy of postoperative cholecalciferol loading (LOAD): study protocol for a randomized controlled trial. Trials. 2015 Aug 5;16:328. doi: 10.1186/s13063-015-0877-9.
Datoer for undersøgelser
Studer store datoer
Studiestart
Studiestart
Primær færdiggørelse (Faktiske)
Primær færdiggørelse
Studieafslutning (Faktiske)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- LOAD
- 2013-003546-16 (EudraCT nummer)
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