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

8 de abril de 2014 atualizado por: 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.

Visão geral do estudo

Status

Concluído

Condições

Intervenção / Tratamento

Descrição detalhada

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.

Tipo de estudo

Intervencional

Inscrição (Real)

12

Estágio

  • Fase 2

Contactos e Locais

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Locais de estudo

    • Quebec
      • Montreal, Quebec, Canadá, H2W1R7
        • Institut de Recherches Cliniques de Montreal

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

18 anos e mais velhos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Tudo

Descrição

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

Plano de estudo

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Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição cruzada
  • Mascaramento: Nenhum (rótulo aberto)

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Comparador Ativo: 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.

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).
Comparador Ativo: 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.
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).
Comparador Ativo: Conventional treatment
Patients will use conventional pump therapy to regulate glucose levels
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).

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
The positive incremental area under the curve of postprandial glucose excursions
Prazo: 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

Medidas de resultados secundários

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

Colaboradores e Investigadores

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Publicações e links úteis

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Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo

1 de agosto de 2013

Conclusão Primária (Real)

1 de fevereiro de 2014

Conclusão do estudo (Real)

1 de fevereiro de 2014

Datas de inscrição no estudo

Enviado pela primeira vez

23 de agosto de 2013

Enviado pela primeira vez que atendeu aos critérios de CQ

23 de agosto de 2013

Primeira postagem (Estimativa)

28 de agosto de 2013

Atualizações de registro de estudo

Última Atualização Postada (Estimativa)

9 de abril de 2014

Última atualização enviada que atendeu aos critérios de controle de qualidade

8 de abril de 2014

Última verificação

1 de abril de 2014

Mais Informações

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .

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