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Closed-loop Control of Glucose Levels (Artificial Pancreas) During Postprandial Exercise in Adults With Type 1 Diabetes

8 februari 2019 uppdaterad av: Rémi Rabasa-Lhoret, Institut de Recherches Cliniques de Montreal

A Single-blind, Randomized, Cross-over Study to Assess the Efficacy of Single-hormone Closed-loop Strategy at Preventing Hypoglycemia During Unannounced and Announced Exercise in Adults With Type 1 Diabetes

Regular physical activity is associated with many health benefits for individuals with type 1 diabetes including improved cardiovascular fitness and vascular health, decreased insulin requirements, improved body composition and quality of life. However, exercise-induced hypoglycemia is very frequent and thus is the main limiting factor for physical activity practice in this population.

The artificial pancreas 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. The artificial pancreas has the potential to reduce the risk of exercise-induced hypoglycemia but the importance of announcing exercise to the artificial pancreas is yet to be explored.

The objective of this study is to investigate 1) if announcing postprandial exercise to the artificial pancreas is beneficial in reducing the risk of hypoglycemia and 2) if an insulin bolus reduction is necessary when announcing the exercise to the artificial pancreas.

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Studietyp

Interventionell

Inskrivning (Faktisk)

37

Fas

  • Fas 2

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

  • Kanada
    • Quebec
      • Montreal, Quebec, Kanada, H2W 1R7
        • Institut de Recherches Cliniques de Montreal

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

18 år och äldre (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Nej

Kön som är behöriga för studier

Allt

Beskrivning

Inclusion Criteria:

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

Exclusion Criteria:

  1. 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.
  2. Recent (< 3 months) acute macrovascular event e.g. acute coronary syndrome or cardiac surgery.
  3. Use of medication with an effect on heart rate (e.g. beta-blockers).
  4. Abnormal blood panel and/or anemia.
  5. Ongoing or planned pregnancy.
  6. Severe hypoglycemic episode within two weeks of screening.
  7. Other serious medical illness likely to interfere with study participation or with the ability to complete the exercise periods by the judgment of the investigator (e.g. orthopedic limitation).
  8. Failure to comply with team's recommendations (e.g. not willing to eat snack, not willing to change pump parameters, etc).
  9. Problems with venous access.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Behandling
  • Tilldelning: Randomiserad
  • Interventionsmodell: Crossover tilldelning
  • Maskning: Enda

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Aktiv komparator: Unannounced exercise
The target blood glucose of the algorithm will be as usual. A pre-meal full insulin bolus will be given.
Läkemedel: Insulin
Patientens vanliga snabbverkande insulinanalog kommer att användas.
Enhet: Dexcom G4 Platinum glukossensor
Dexcom G4 Platinum glukossensor kommer att användas för att mäta glukosnivåer.
Övrig: 60-minute exercise
Patients will be admitted at the research clinical facility at 6:30. The artificial pancreas intervention will start at 7:00. A standardized breakfast will be served at 8:00. At 9:30, patients will performed a 60-minute exercise on the ergocycle at 60% of VO2 max. At 11:30, patients will be switched to standard insulin pump therapy and a lunch will be served. Patients will be discharged after lunch consumption.
Enhet: Insulin pump
Patient's insulin pump will be used to infuse insulin.
Övrig: Single-hormone closed-loop strategy
Variable subcutaneous insulin infusion rates will be used to regulate glucose levels. Patient's usual fast acting insulin analog (Lispro, Aspart or Guilisine) will be infused using the patient's pump. The glucose level as measured by the real time sensor (Dexcom G4 Platinum, Dexcom Inc.) will be entered manually into the computer every 10 minutes. The pump's infusion rate will then be changed manually based on the computer generated recommendation infusion rates.
Aktiv komparator: Announced exercise with pre-meal full bolus
The target blood glucose of the algorithm will be increased and a pre-meal full bolus will be given
Läkemedel: Insulin
Patientens vanliga snabbverkande insulinanalog kommer att användas.
Enhet: Dexcom G4 Platinum glukossensor
Dexcom G4 Platinum glukossensor kommer att användas för att mäta glukosnivåer.
Övrig: 60-minute exercise
Patients will be admitted at the research clinical facility at 6:30. The artificial pancreas intervention will start at 7:00. A standardized breakfast will be served at 8:00. At 9:30, patients will performed a 60-minute exercise on the ergocycle at 60% of VO2 max. At 11:30, patients will be switched to standard insulin pump therapy and a lunch will be served. Patients will be discharged after lunch consumption.
Enhet: Insulin pump
Patient's insulin pump will be used to infuse insulin.
Övrig: Single-hormone closed-loop strategy
Variable subcutaneous insulin infusion rates will be used to regulate glucose levels. Patient's usual fast acting insulin analog (Lispro, Aspart or Guilisine) will be infused using the patient's pump. The glucose level as measured by the real time sensor (Dexcom G4 Platinum, Dexcom Inc.) will be entered manually into the computer every 10 minutes. The pump's infusion rate will then be changed manually based on the computer generated recommendation infusion rates.
Aktiv komparator: Announced exercise with reduced insulin bolus
The target blood glucose of the algorithm will be increased and the pre-meal insulin bolus will be reduced by 33%.
Läkemedel: Insulin
Patientens vanliga snabbverkande insulinanalog kommer att användas.
Enhet: Dexcom G4 Platinum glukossensor
Dexcom G4 Platinum glukossensor kommer att användas för att mäta glukosnivåer.
Övrig: 60-minute exercise
Patients will be admitted at the research clinical facility at 6:30. The artificial pancreas intervention will start at 7:00. A standardized breakfast will be served at 8:00. At 9:30, patients will performed a 60-minute exercise on the ergocycle at 60% of VO2 max. At 11:30, patients will be switched to standard insulin pump therapy and a lunch will be served. Patients will be discharged after lunch consumption.
Enhet: Insulin pump
Patient's insulin pump will be used to infuse insulin.
Övrig: Single-hormone closed-loop strategy
Variable subcutaneous insulin infusion rates will be used to regulate glucose levels. Patient's usual fast acting insulin analog (Lispro, Aspart or Guilisine) will be infused using the patient's pump. The glucose level as measured by the real time sensor (Dexcom G4 Platinum, Dexcom Inc.) will be entered manually into the computer every 10 minutes. The pump's infusion rate will then be changed manually based on the computer generated recommendation infusion rates.

Vad mäter studien?

Primära resultatmått

Resultatmått
Tidsram
Percentage of time of plasma glucose levels spent below 3.9 mmol/L
Tidsram: From 9:30 to 11:30 (120 minutes)
From 9:30 to 11:30 (120 minutes)

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Relative decrease in glucose levels during exercise compared to pre-breakfast levels
Tidsram: From 8:00 to 10:50 (170 minutes)
Difference between pre-breakfast levels and the lowest glucose level from the start of the exercise until 20 minutes after exercise
From 8:00 to 10:50 (170 minutes)
Number of patients experiencing exercise-induced hypoglycemia requiring treatment
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Decremental area under the curve from the start of the exercise
Tidsram: From 9:30 to 11:00 (90 minutes)
From 9:30 to 11:00 (90 minutes)
Percentage of time of plasma glucose levels spent below 3.9 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Percentage of time of plasma glucose levels spent below 3.3 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Percentage of time of plasma glucose levels spent below 2.8 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Percentage of time of plasma glucose levels spent between 3.9 and 7.8 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Percentage of time of plasma glucose levels spent above 10 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Percentage of time of plasma glucose levels spent above 13.9 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Percentage of time of plasma glucose levels spent above 16.7 mmol/L
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)
Mean plasma glucose levels
Tidsram: From 8:00 to 11:30 (210 minutes)
From 8:00 to 11:30 (210 minutes)
Standard deviation of glucose levels
Tidsram: From 8:00 to 11:30 (210 minutes)
From 8:00 to 11:30 (210 minutes)
Coefficient of variation of glucose levels
Tidsram: From 8:00 to 11:30 (210 minutes)
From 8:00 to 11:30 (210 minutes)
Mean time (minutes) to the first hypoglycemic event
Tidsram: From 9:30 to 10:30 (60 minutes)
From 9:30 to 10:30 (60 minutes)

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

Institut de Recherches Cliniques de Montreal

Publikationer och användbara länkar

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Allmänna publikationer

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart

1 september 2016

Primärt slutförande (Faktisk)

1 december 2018

Avslutad studie (Faktisk)

1 december 2018

Studieregistreringsdatum

Först inskickad

1 augusti 2016

Först inskickad som uppfyllde QC-kriterierna

1 augusti 2016

Första postat (Uppskatta)

4 augusti 2016

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

11 februari 2019

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

8 februari 2019

Senast verifierad

1 februari 2019

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • CLASS-16

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OBESLUTSAM

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