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

8. April 2014 aktualisiert von: 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.

Studienübersicht

Status

Abgeschlossen

Bedingungen

Intervention / Behandlung

Detaillierte Beschreibung

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.

Studientyp

Interventionell

Einschreibung (Tatsächlich)

12

Phase

  • Phase 2

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienorte

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

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

18 Jahre und älter (Erwachsene, Älterer Erwachsener)

Akzeptiert gesunde Freiwillige

Nein

Studienberechtigte Geschlechter

Alle

Beschreibung

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

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Hauptzweck: Behandlung
  • Zuteilung: Zufällig
  • Interventionsmodell: Crossover-Aufgabe
  • Maskierung: Keine (Offenes Etikett)

Waffen und Interventionen

Teilnehmergruppe / Arm
Intervention / Behandlung
Aktiver 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.
Sonstiges: 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).
Aktiver 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.
Sonstiges: 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).
Aktiver Komparator: Conventional treatment
Patients will use conventional pump therapy to regulate glucose levels
Sonstiges: 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).

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
The positive incremental area under the curve of postprandial glucose excursions
Zeitfenster: 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

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Zeitfenster
Mean plasma glucose
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Incremental two hours postprandial glucose
Zeitfenster: 2 hours after meal intake
2 hours after meal intake
Incremental postprandial peak-glucose values
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose levels between 4.0 and 10.0 mmol/L
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose levels spent above 10.0 mmol/L
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose levels spent below 4.0 mmol/L
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Total insulin delivery
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Total glucagon delivery
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Standard deviation of glucose levels
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose concentrations below 3.5 mmol/L
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Percentage of time of plasma glucose concentrations above 14 mmol/L
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Mean plasma insulin concentration
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Mean plasma glucagon concentration
Zeitfenster: 8h00 to 21h00
8h00 to 21h00
Number of patients experiencing hypoglycemia requiring oral treatment
Zeitfenster: 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.
Zeitfenster: 4 hours after meal intake
4 hours after meal intake

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Institut de Recherches Cliniques de Montreal

Mitarbeiter

Juvenile Diabetes Research Foundation

Publikationen und hilfreiche Links

Die Bereitstellung dieser Publikationen erfolgt freiwillig durch die für die Eingabe von Informationen über die Studie verantwortliche Person. Diese können sich auf alles beziehen, was mit dem Studium zu tun hat.

Allgemeine Veröffentlichungen

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn

1. August 2013

Primärer Abschluss (Tatsächlich)

1. Februar 2014

Studienabschluss (Tatsächlich)

1. Februar 2014

Studienanmeldedaten

Zuerst eingereicht

23. August 2013

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

23. August 2013

Zuerst gepostet (Schätzen)

28. August 2013

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Schätzen)

9. April 2014

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

8. April 2014

Zuletzt verifiziert

1. April 2014

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Schlüsselwörter

Zusätzliche relevante MeSH-Bedingungen

Andere Studien-ID-Nummern

  • CLASS-05

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