Type 1 Diabetes Clinical Trial
Official title:
A Randomised, 2-period Cross-over Study to Assess the Feasibility of Overnight Computer-based Glucose Control Based on Continuous Subcutaneous Glucose Monitoring, and Compare it With Conventional Pump Therapy in Adults With Type 1 Diabetes
The main objective of this study is to evaluate the feasibility of closed loop insulin pump therapy to improve overnight glucose control in adults with type 1 diabetes.
People with type 1 diabetes(T1D) need regular insulin injections or continuous delivery of
insulin using an insulin pump in order to keep the blood glucose levels normal. We know that
keeping blood sugars in the normal range will help prevent long term diabetes related
complications involving the eyes, kidneys and heart. However, achieving treatment goals can
be very difficult as the tighter we try to control blood glucose levels, the greater the
risk of the person developing episodes of low glucose levels (hypoglycaemia). This is a
particular problem at night and one solution is to develop a system whereby the amount of
insulin injected is very closely matched to the blood sugar levels on a continuous basis.
This can be achieved by what is called a "closed loop system" where a small glucose sensor
placed under the skin communicates with a computer containing an algorithm that drives an
insulin pump. This system is being developed in Cambridge and we have trialed this on 16
children and adolescents with T1D in a clinical setting over the past year. We have found
that this system is very effective at preventing hypoglycaemia in this group of patients.
We will recruit 12 adults with T1D on insulin pump therapy, and the studies will be done in
a clinical research facility. The subjects will be studied on two nights. On one night they
will have their normal insulin pump therapy and on the other night their insulin pump will
be varied according to information about blood glucose values from the continuous glucose
sensor. This information will be manually typed into the computer every 15 minutes from 8pm
until 8am. The algorithm will advise of the insulin infusion rate and this will be manually
changed by a trained nurse every 15 minutes throughout the night.
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Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Crossover Assignment, Masking: Open Label, Primary Purpose: Treatment
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