Condition category
Nutritional, Metabolic, Endocrine
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status
Results overdue

Plain English Summary

Background and study aims:
Insulin is given to treat diabetes mellitus type 1. To know how much insulin needs to be given, patients need to be aware of their glucose levels so that they do not over or underdose their insulin. The information about glucose levels is traditionally acquired by fingerprick. Recently, devices have been made which measure glucose continuously by inserting a small needle-like sensor in the fat of the skin. These continuous glucose monitors (CGM) are an important tool in the treatment of diabetes and in the development of an artificial pancreas. An artificial pancreas is a device which automatically makes decisions about what amount of insulin is needed based on the glucose data from the sensor; the artificial pancreas then delivers this insulin automatically. This trial will collect data from two glucose sensors used in the treatment of patients with diabetes.

Who can participate?
Patients with type 1 diabetes for at least 6 months, aged 18 years or above, with a Body Mass Index (BMI) of less than 35 kg/m². Participants had to be willing to wear a CGM device for the duration of the seven study days and undergo all study procedures.

What does the study involve?
The two sensors were inserted under the skin and recording was started. Sensor data was collected over a seven day period while the participants were at home, and at the clinical research centre. All participants were treated the same way.

What are the possible benefits and risks of participating?
There are no known benefits to participants of taking part in this study. There is a small risk of infection at blood collection sites and infection or irritation at the sensor site.

Where is the study run from?
Academic Medical Centre, The Netherlands
Profil GmbH, Neuss, Germany
Medical University Graz, Austria
(Medical University and Hospital of Padua, Padua, Italy

When is the study starting and how long is it expected to run for?
The study started in December 2010 and ended in February 2011

Who is funding the study?
European Community Framework Programme 7 ref: FP7-ICT-2009-4

Who is the main contact?
Dr JH DeVries

Trial website

Contact information



Primary contact

Dr J Hans DeVries


Contact details

PO Box 22660
1100 DD

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Collection of continuous glucose monitoring and reference glucose values to develop and test algorithms for a continuous glucose monitor



Study hypothesis

The aim of this study is the collection of clinical data to develop and test calibration, filtering and prediction algorithms to be embedded in the so-called “smart sensor” for the enhancement of continuous glucose monitoring outcomes. In particular, the collected data will be used for the identification of the parameters, i.e. the gradient g and time constant τ, which characterize the BG-to-IG dynamic model.

Ethics approval

1. Medical Ethics Review Academic Medical Center Amsterdam [Medisch Ethische Toetsingscommissie Academisch Medisch Centrum Amsterdam], 26 August 2010, ref: 10/195
2. Ethics Committee of the Medical University of Graz [Ethikkommission der Medizinischen Universität Graz]
3. Hospital and University of Padua Ethics Committee for Experimentation [Azienda Ospedaliera e Università degli Studi di Padova Comitato Etico per la Sperimentazione]
4. Ethics Committee of the Medical Association of North [Ethikkommission der Ärztekammer Nordrhein]

Study design

Open-label non-randomised controlled trial

Primary study design


Secondary study design

Non randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Diabetes mellitus type 1


2 CGM DexCom Seven Plus (Sensor 1 and Sensor 2) will be inserted on the participant and recording will start. In both sensors, standard calibration will be performed right after the insertion. Sensor data will then be collected over the course of a seven day period all of which are in an outpatient setting, with the exception of day 3, 4 or 5 where CGM data will be collected in the clinical research center after meal challenges.

Intervention type



Not Applicable

Drug names

Primary outcome measure

1. Continuous Glucose Monitoring (CGM) data
2. Self-monitoring blood glucose (SMBG) data
3. Insulin doses
4. Composition of meals and calibration data

Secondary outcome measures

The collected data will be used for the identification of the parameters, i.e. the gradient g and
time constant τ, which characterize the BG-to-IG dynamic model

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Aged 18 years or above
2. Diagnosed with Type 1 diabetes mellitus at least 6 months according to the WHO definition
3. Body Mass Index (BMI) <35 kg/m²
4. Willing to wear a Continuous Glucose Monitoring (CGM) device for the duration of the seven study days and undergo all study procedures
5. HbA1c <10%
6. If patient is on antihypertensive, thyroid, anti-depressant or lipid lowering medication, patient must have stability on the medication for at least 1 month prior to enrolment in the study and for the study duration
7. Signed informed consent form prior to study entry

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Patient is pregnant, or breast feeding during the period of the study
2. Patient is using a medication that significantly impacts glucose metabolism (oral steroids) except if stable for at least the last three months and expected to remain stable for the study duration
3. Has severe medical or psychological condition(s) or chronic conditions/infections that in the opinion of the Investigator would compromise the patient’s safety or successful participation in the study
4. Patient is actively enrolled in another clinical trial or took part in a study within 30 days
5. Known adrenal gland problem, pancreatic tumour, or insulinoma
6. Retinopathy except background retinopathy according to eye fundus examination during the last year
7. Known bleeding diathesis or dyscrasia
8. Inability of the patient to comply with all study procedures
9. Inability of the patient to understand the patient information
10. Patient donated blood in the last 3 months

Recruitment start date


Recruitment end date



Countries of recruitment

Austria, Germany, Italy, Netherlands

Trial participating centre

PO Box 22660
1100 DD

Sponsor information


Academic Medical Centre (Netherlands)

Sponsor details

PO Box 22660
1100 DD

Sponsor type

Hospital/treatment centre



Funder type


Funder name

European Community Framework Programme 7 ref: FP7-ICT-2009-4

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes