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Mechanisms of Glycemic Improvement After Gastrointestinal Surgery

29. marts 2016 opdateret af: David Flum, University of Washington
This study is designed as a prospective clinical trial aimed at investigating the mechanisms behind observed improvements in type 2 diabetes mellitus (T2DM) following bariatric surgery. The majority of patients with T2DM who are undergoing Roux-en-Y gastric bypass (RYGB) surgery, in particular, experience complete remission of T2DM almost immediately post-surgery. This response occurs before significant weight loss is possible. To assess the mechanisms involved with disease resolution, the investigators propose a study to evaluate patients at the UW Medical Center (UWMC) who have T2DM and are undergoing RYGB with G (gastronomy)-tube placement as part of their clinical care. The investigators are interested in this sub-population as the G-tube allows us the unique opportunity to evaluate glycemic control and insulin response following delivery or exclusion of nutrients to the otherwise bypassed portion of the gastrointestinal tract. The investigators hypothesize that nutrient delivery to the proximal GI tract will reverse RYGB-mediated improvements in glucose homeostasis, possibly in association with changes in nutrient-regulated gut peptides involved in glucose control.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Roux-en-Y gastric bypass surgery causes complete, durable remission of type 2 diabetes (T2DM) in 84% of cases, typically within a few days to weeks after surgery. Mounting evidence indicates that this dramatic phenomenon results from effects beyond those related to weight loss and reduced caloric intake alone. The mechanisms mediating the weight-independent anti-diabetes impact of RYGB are unknown, and elucidating them could lead to new diabetes medicines. Human subjects will undergo frequently sampled I.V. glucose tolerance tests (FS-IVGTT) and tracer-enhanced hyperinsulinemic/euglycemic clamps (to measure insulin secretion and sensitivity) before RYBG and 3 times in the first six weeks afterward, during which the proximal small bowel will either be excluded from nutrient contact or exposed to nutrients delivered through an indwelling gastric cannula. We hypothesize that nutrient delivery to the proximal GI tract will reverse RYGB-mediated improvements in glucose homeostasis, possibly in association with changes in nutrient-regulated gut peptides involved in glucose control. Our study will allow us to test the upper intestinal hypothesis rigorously in man, and whether the hypothesis is confirmed or refuted, we will gain valuable new insights into the mechanisms of improved glucose control early after RYGB.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

7

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Forenede Stater
    • Washington
      • Seattle, Washington, Forenede Stater, 98195
        • University of Washington Medical Center

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Patients planning to undergo RYGB at UWMC with planned placement of gastrostomy tube.

Beskrivelse

Inclusion Criteria:

  • Age 18 years or greater and planning to undergo RYGB at UWMC
  • Ability to speak English and communicate effectively with research staff
  • Ability to return for follow-up visits at UWMC
  • Adequate IV access
  • A G-tube is planned as part of the bariatric surgical procedure
  • Documented T2DM (fasting plasma glucose >125 mg/dL) that is treated with lifestyle efforts or by taking acceptable oral medications

Exclusion Criteria:

  • Informed consent not obtained
  • Unlikely to comply with the protocol
  • Current HbA1c >8.5% or fasting blood glucose >180 mg/dL
  • Serum creatinine >1.7 mg/dL
  • Use of unacceptable diabetes medications at baseline

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
RYGB
UWMC patients undergoing RYGB surgery with routine placement of Gastrostomy tube.
Andet: Ingen indgriben

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
Determine if the improvements in glycemic control occurring early after RYGB can be reversibly inactivated and activated through delivery or exclusion of nutrients in the bypassed proximal small intestine.
Tidsramme: 1/2010 - 6/2014
1/2010 - 6/2014

Sekundære resultatmål

Resultatmål
Tidsramme
To evaluate whether improvements in glucose control occurring early after RYGB are related to altered insulin secretion, insulin sensitivity, or both.
Tidsramme: 1/2010-6/2014
1/2010-6/2014

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

University of Washington

Samarbejdspartnere

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Efterforskere

  • Ledende efterforsker: David R Flum, MD, MPH, University of Washington
  • Ledende efterforsker: David E Cummings, MD, University of Washington

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. januar 2010

Primær færdiggørelse (Faktiske)

1. juni 2015

Studieafslutning (Faktiske)

1. juni 2015

Datoer for studieregistrering

Først indsendt

2. december 2009

Først indsendt, der opfyldte QC-kriterier

3. december 2009

Først opslået (Skøn)

4. december 2009

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

31. marts 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

29. marts 2016

Sidst verificeret

1. marts 2016

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 36417-A
  • 1R01DK084324-01 (U.S. NIH-bevilling/kontrakt)

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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Kliniske forsøg med Ingen indgriben

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Sponsorer og samarbejdspartnere

Medicinske tilstande

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CROs by country

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Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

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