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Closed-loop Control of Glucose Levels After Meal Intake in Adults With Type 1 Diabetes

8. april 2014 opdateret af: Rémi Rabasa-Lhoret, Institut de Recherches Cliniques de Montreal

An Open-label, Randomized, Three-way, Cross-over Study to Compare the Efficacy of Closed-loop Operation Combined With Meal-and-carbohydrate-announcement Closed-loop Operation Combined With Meal-announcement, and Conventional Pump Therapy in Regulating Glucose Levels in Adults With Type 1 Diabetes

Closed-loop strategy is composed of three components: glucose sensor to read glucose levels, insulin pump to infuse insulin and a dosing mathematical algorithm to decide on the required insulin dosage based on the sensor's readings. A dual-hormone closed-loop system would regulate glucose levels through the infusion of two hormones: insulin and glucagon.

The objective of this project is to assess whether a dual-hormone closed-loop strategy would alleviate the burden of carbohydrate counting from patients with type 1 diabetes (T1D) without a significant degradation in post-meal glucose control.

Our primary hypothesis is that meal-announcement strategy (pre-meal CHO-independent bolus) is equivalent to meal-and-carbohydrate-announcement strategy (full CHO-matching bolus) during closed-loop regulation of glucose levels in adults with T1D. Our secondary hypothesis is that closed-loop strategy with meal-announcement strategy (pre-meal CHO-independent bolus) or meal-and-carbohydrate-announcement strategy (full CHO-matching bolus) is better than conventional pump treatment in regulation of glucose levels in adults with T1D.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Closed-loop strategy is composed of three components: glucose sensor to read glucose levels, insulin pump to infuse insulin and a dosing mathematical algorithm to decide on the required insulin dosages based on the sensor's readings. A dual-hormone closed-loop system would regulate glucose levels through the infusion of two hormone: insulin and glucagon.

Each patient will be admitted three times to a clinical research facility. In the meal-and-carbohydrate-announcement visit, patients will eat 3 meals accompanied with a matching insulin bolus (depending on the carbohydrate content of the meal) and glucose levels will be subsequently regulated using dual-hormone closed-loop system. In the meal-announcement visit, patients will eat the 3 same meals but will inject only a partial insulin bolus (not depending on carbohydrate content of the meal) and the remaining needed insulin will be delivered based on glucose sensor excursions as part of closed-loop operation. In the control visit, patients will use conventional pump therapy to regulate glucose levels.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

12

Fase

  • Fase 2

Kontakter og lokationer

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

Studiesteder

  • Canada
    • Quebec
      • Montreal, Quebec, Canada, H2W1R7
        • Institut de recherches cliniques de Montreal

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

Beskrivelse

Inclusion Criteria:

  • Males and females ≥ 18 years of old.
  • Clinical diagnosis of type 1 diabetes for at least one year.
  • The subject will have been on insulin pump therapy for at least 3 months.
  • Last (less than 3 months) HbA1c ≤ 12%.

Exclusion Criteria:

  • Clinically significant microvascular complications: nephropathy (estimated glomerular filtration rate below 40 ml/min), neuropathy (especially diagnosed gastroparesis) or severe proliferative retinopathy as judged by the investigator.
  • Recent (< 3 months) acute macrovascular event e.g. acute coronary syndrome or cardiac surgery.
  • Ongoing pregnancy.
  • Severe hypoglycemic episode within two weeks of screening.
  • Medication likely to affect with the interpretation of the results because of their well known impact on gastric emptying: Motilium®, Prandase®, Victoza®, Byetta® and Symlin®.
  • Known or suspected allergy to the trial products, meal contents including nuts, peanuts, dairy products or eggs.
  • Unusual nutritional habits (e.g. vegetarians)
  • Other serious medical illness likely to interfere with study participation or with the ability to complete the trial by the judgment of the investigator.
  • Failure to comply with team's recommendations (e.g. not willing to eat snack, not willing to change pump parameters, etc).
  • Unreliable carbohydrate counting or lack of insulin to carbohydrate ratios
  • Problems with venous access

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Aktiv komparator: CHO-dependant bolus

An insulin bolus dependant of carbohydrate content will be given after each meal.

Each subject insulin-to-carbohydrate ratio (U per 10g CHO) will be used to calculate the insulin bolus to be given. The dual-hormone closed-loop strategy will give the remaining insulin needed based on the sensor readings.
Andet: 14 hours intervention
Subjects will be admitted at the IRCM at 6:30. Subjects will be asked to fast from midnight. At 8:00, a standardized (50g CHO for males; 30g CHO for females) meal will be served. At 12:00, a standardized (120g CHO for males; 90g CHO for females) meal will be served. At 17:00, a standardized (70g CHO for males; 50g CHO for females) meal will be served. Between meals, patients will be allowed to do sedentary activities (reading, watching television, and playing video games, etc).
Aktiv komparator: CHO-independent bolus
An insulin bolus independent of carbohydrate content will be given after each meal. The dual-hormone closed-loop strategy will give the remaining insulin needed based on the sensor readings.
Andet: 14 hours intervention
Subjects will be admitted at the IRCM at 6:30. Subjects will be asked to fast from midnight. At 8:00, a standardized (50g CHO for males; 30g CHO for females) meal will be served. At 12:00, a standardized (120g CHO for males; 90g CHO for females) meal will be served. At 17:00, a standardized (70g CHO for males; 50g CHO for females) meal will be served. Between meals, patients will be allowed to do sedentary activities (reading, watching television, and playing video games, etc).
Aktiv komparator: Conventional treatment
Patients will use conventional pump therapy to regulate glucose levels
Andet: 14 hours intervention
Subjects will be admitted at the IRCM at 6:30. Subjects will be asked to fast from midnight. At 8:00, a standardized (50g CHO for males; 30g CHO for females) meal will be served. At 12:00, a standardized (120g CHO for males; 90g CHO for females) meal will be served. At 17:00, a standardized (70g CHO for males; 50g CHO for females) meal will be served. Between meals, patients will be allowed to do sedentary activities (reading, watching television, and playing video games, etc).

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
The positive incremental area under the curve of postprandial glucose excursions
Tidsramme: 4 hours after meal intake
The positive incremental area under the curve (IAUC, as compared to pre-meal glucose value) of the 4-hr postprandial glucose excursions for the breakfast, lunch and dinner meals.
4 hours after meal intake

Sekundære resultatmål

Resultatmål
Tidsramme
Mean plasma glucose
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Incremental two hours postprandial glucose
Tidsramme: 2 hours after meal intake
2 hours after meal intake
Incremental postprandial peak-glucose values
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose levels between 4.0 and 10.0 mmol/L
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose levels spent above 10.0 mmol/L
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose levels spent below 4.0 mmol/L
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Total insulin delivery
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Total glucagon delivery
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Standard deviation of glucose levels
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose concentrations below 3.5 mmol/L
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose concentrations above 14 mmol/L
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Mean plasma insulin concentration
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Mean plasma glucagon concentration
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Number of patients experiencing hypoglycemia requiring oral treatment
Tidsramme: 8h00 to 21h00
8h00 to 21h00
Incremental area under the curve of the 4-hr postprandial glucose excursions but the reference glucose is set to 5.0 mmol/L if premeal glucose is less than 5.0 mmol/L.
Tidsramme: 4 hours after meal intake
4 hours after meal intake

Samarbejdspartnere og efterforskere

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

Sponsor

Institut de Recherches Cliniques de Montreal

Samarbejdspartnere

Juvenile Diabetes Research Foundation

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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. august 2013

Primær færdiggørelse (Faktiske)

1. februar 2014

Studieafslutning (Faktiske)

1. februar 2014

Datoer for studieregistrering

Først indsendt

23. august 2013

Først indsendt, der opfyldte QC-kriterier

23. august 2013

Først opslået (Skøn)

28. august 2013

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

9. april 2014

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

8. april 2014

Sidst verificeret

1. april 2014

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • CLASS-05

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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