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Safety of Overestimation of a Meal Insulin Bolus in the Context of Dual-hormone Closed-loop Operation - Part 2

25. April 2017 aktualisiert von: Rémi Rabasa-Lhoret, Institut de Recherches Cliniques de Montreal

In previous studies, investigators have studied if a pre-meal insulin bolus based on estimated carbohydrate meal size would alleviate the burden of carbohydrate counting without a significant degradation in postprandial glucose control. With this strategy, the patient would only have to evaluate the size of the meal in terms of carbohydrate (snack, regular, large or very large). It is however important to establish the safety of this simplified meal bolus approach. The safety of overestimating a meal insulin bolus in the context of closed-loop strategy needs to be assessed. For ethical reasons, only dual-hormone closed-loop will be tested.

Investigators hypothesize that dual-hormone closed-loop with overestimated meal size bolus will not increase time below 4.0 mmol/L compared to dual-hormone closed-loop with an adequately estimated meal size bolus.

Studienübersicht

Status

Abgeschlossen

Bedingungen

Intervention / Behandlung

Studientyp

Interventionell

Einschreibung (Tatsächlich)

11

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

    • Quebec
      • Montreal, Quebec, Kanada, H2W 1R7
        • Institut de recherches cliniques de Montréal

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:

  1. Males and females ≥ 18 years 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 and currently using a fast acting insulin analog (Lispro, Aspart or Glulisine).
  4. Last (less than 3 months) HbA1c ≤ 10%.
  5. Currently using carbohydrate counting as the meal insulin dose strategy.

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. Pregnancy.
  4. Severe hypoglycemic episode within 1 month of screening.
  5. Agents affecting gastric emptying (Motilium®, Prandase®, Victoza®, Byetta® and Symlin®) as well as oral anti-diabetic agents (Metformin, SGLT-2 inhibitors and DPP-4 inhibitors) if not at a stable dose for 3 months. Otherwise, these medications are acceptable and will be kept stable during the entire protocol.
  6. Oral steroids unless patients present a low stable dose (e.g. 10 mg or less of prednisone per day or physiological doses, less than 35 mg/day, of hydrocortisone Cortef®). Inhale steroids at stable dose in the last month are acceptable.
  7. Other serious medical illness likely to interfere with study participation or with the ability to complete the trial by the judgment of the investigator (e.g. unstable psychiatric condition).
  8. Failure to comply with team's recommendations (e.g. not willing to change pump parameters, follow algorithm's suggestions, etc).

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: Single

Waffen und Interventionen

Teilnehmergruppe / Arm
Intervention / Behandlung
Aktiver Komparator: Dual-hormone CL with overestimation of meal size category
A regular size standardized meal of 45g of carbohydrates will be provided to the patient and the meal size will be overestimated by one category, which will result in a meal insulin bolus for a meal of 65g of carbohydrates.
Glucagon (Eli Lilly) wird während der Dual-Hormon-Closed-Loop-Strategie verwendet.
Interventions will be undertaken 1 to 5 days after sensor insertion. Subjects will be admitted at the research center at 7:00. Subject's pump will be substituted with the study pump and an additional pump containing glucagon will be installed. At 7:00, closed-loop will be initiated. At 9:00, a standardized breakfast (45g CHO) will be served. Study subjects will consume the same meal on the two intervention days. During the intervention, patients will be allowed to do sedentary activities. Patients will be allowed to consume caffeine during the intervention, but will have to replicate their caffeine consumption on both interventions. The intervention day will end at 13:00.
Participant's usual fast-acting insulin analog will be used: Lispro (Humalog), Aspart (NovoRapid) or Glulisine (Apidra).
Aktiver Komparator: Dual-hormone CL with adequate estimation of meal size category
A regular size standardized meal of 45g of carbohydrates will be provided to the patient and the meal size will be adequately estimated, which will result in a meal insulin bolus for a meal of 35g of carbohydrates.
Glucagon (Eli Lilly) wird während der Dual-Hormon-Closed-Loop-Strategie verwendet.
Interventions will be undertaken 1 to 5 days after sensor insertion. Subjects will be admitted at the research center at 7:00. Subject's pump will be substituted with the study pump and an additional pump containing glucagon will be installed. At 7:00, closed-loop will be initiated. At 9:00, a standardized breakfast (45g CHO) will be served. Study subjects will consume the same meal on the two intervention days. During the intervention, patients will be allowed to do sedentary activities. Patients will be allowed to consume caffeine during the intervention, but will have to replicate their caffeine consumption on both interventions. The intervention day will end at 13:00.
Participant's usual fast-acting insulin analog will be used: Lispro (Humalog), Aspart (NovoRapid) or Glulisine (Apidra).

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Zeitfenster
Percentage of time below 4.0 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Zeitfenster
Mean glucose
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Percentage of time of glucose concentrations between 4.0 and 8.0 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Percentage of time of glucose concentrations between 4.0 and 10.0 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Percentage of time of glucose concentrations below 3.1 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Area under the curve of glucose values below 4.0 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Area under the curve of glucose values below 3.1 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Number of patients with at least one hypoglycemic event with or without symptoms
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Total number of hypoglycemic event below 3.1 mmol/L
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Total carbohydrate intake for hypoglycemia correction
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Total insulin delivery
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
Total glucagon delivery
Zeitfenster: The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.
The outcome measure will be calculated over the 4 hours following the breakfast meal. The 4-hour period is from 9:00 to 13:00.

Mitarbeiter und Ermittler

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Sponsor

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. Juni 2016

Primärer Abschluss (Tatsächlich)

1. März 2017

Studienabschluss (Tatsächlich)

1. März 2017

Studienanmeldedaten

Zuerst eingereicht

9. Juni 2016

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

9. Juni 2016

Zuerst gepostet (Schätzen)

14. Juni 2016

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

26. April 2017

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

25. April 2017

Zuletzt verifiziert

1. April 2017

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • CLASS-Safety study - Part 2

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