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Development of Algorithms for a Hypoglycemic Prevention Alarm: Closed Loop Study

This study has been completed.
University of Colorado, Denver
Information provided by (Responsible Party):
Bruce A. Buckingham, Stanford University Identifier:
First received: April 17, 2009
Last updated: March 5, 2015
Last verified: March 2015

This research study, Development of Algorithms for a Hypoglycemic Prevention Alarm, is being conducted at Stanford University Medical Center and the University of Colorado Barbara Davis Center. It is paid for by the Juvenile Diabetes Research Foundation.

The purpose of doing this research study is to understand the best way to stop an insulin infusion pump from delivering insulin to prevent a subject from having hypoglycemia. The investigators think that if they take into account how quickly your blood sugar (glucose) is dropping we can stop your basal insulin from your pump for 2 hours and keep you from going low. The investigators hope that what they learn from this study can be used to set up communication between a continuous glucose monitor and an insulin pump. However, the investigators do not currently know the best way to do this.

Condition Intervention
Diabetes Mellitus
Device: Medtronic Real Time Continuous Glucose monitor

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Official Title: Development of Algorithms for a Hypoglycemic Prevention Alarm

Resource links provided by NLM:

Further study details as provided by Stanford University:

Primary Outcome Measures:
  • The prevention of nocturnal hypoglycemia defined as blood sugar less than 60 mg/dl. [ Time Frame: 7/2011 ]

Secondary Outcome Measures:
  • Blood sugar values above 180 mg/dl. [ Time Frame: 7/2011 ]

Enrollment: 28
Study Start Date: May 2007
Study Completion Date: August 2011
Primary Completion Date: July 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Predictive suspend
The intervention is using a predictive low glucose suspend algorithm to prevent nocturnal hypoglycemia using algorithm based on 'Medtronic Real Time Continuous Glucose monitor'
Device: Medtronic Real Time Continuous Glucose monitor
insulin pump delivery will be suspend when hypoglcyemia is predicted based on Medtronic real time continuous glucose monitor. Algorithym resides on a bedside computer

Detailed Description:

The study is expected to include a maximum of 80 people who have type 1 diabetes and are between the ages of 12 - 46 years old.

Your involvement in this research study is expected to take approximately 3-9 months depending on your decision to continue using the Navigator Continuous Glucose Monitor.

Each subject will have one enrollment visit of approximately 2 hours. You will then return for one or two 14 hour overnight hospital admissions in the Clinical Research Center (CRC). After the CRC visit(s) you will be given the option to continue using a Navigator CGM at home for an additional 13 weeks. If you decide to continue use of the Navigator you will be scheduled for an additional phone consult or visit to Stanford one week after your hospital admission. In addition, you will be required to return to Stanford for a final 13 week visit.


Ages Eligible for Study:   12 Years to 46 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

The inclusion criteria for this study includes the following:

  1. Clinical diagnosis of type 1 diabetes and using daily insulin therapy for at least one year.
  2. Age 12.0 years to less than 46.0 years old.
  3. Subject has used a downloadable insulin pump for at least 3 months
  4. Parent/guardian and subject understand the study protocol and agree to comply with it.
  5. Subjects >12.0 years old and primary care giver (i.e., parent or guardian) comprehend written English.
  6. Subject has a home computer with email access.
  7. For females, subject not intending to become pregnant during the study.
  8. No expectation that subject will be moving out of the area of the clinical center during the study.
  9. Informed Consent Form signed by the parent/guardian and Child Assent Form signed by subjects ages 12 to 17 years.
  10. Subjects cannot have had a severe hypoglycemic event, as described as a seizure, loss of consciousness, severe neurological impairment, or neurological impairment suggestive of hypoglycemia and requiring an emergency department visit or hospitalization within 18 months of enrollment.

Exclusion Criteria:

The exclusion criteria for this study is the following:

  1. The presence of a significant medical disorder that in the judgment of the investigator will affect the wearing of the sensors or the completion of any aspect of the protocol
  2. The presence of any of the following diseases:

    • Asthma if treated with systemic or inhaled corticosteroids in the last 6 months
    • Cystic fibrosis
    • Angina (recurrent heart pain)
    • Past heart attack or coronary artery (heart vessel) disease
    • Past stroke or impairment of blood flow to the brain
    • Other major illness that in the judgment of the investigator might interfere with the completion of the protocol Adequately treated thyroid disease and celiac disease do not exclude subjects from enrollment
  3. Inpatient psychiatric treatment in the past 6 months for either the subject or the subject's primary care giver (i.e., parent or guardian)
  4. Current use of oral/inhaled glucocorticoids or other medications, which in the judgment of the investigator would be a contraindication to participation in the study
  Contacts and Locations
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Please refer to this study by its identifier: NCT00884611

United States, California
Stanford University School of Medicine
Stanford, California, United States, 94305
United States, Colorado
Barbara Davis Center for Childhood Diabetes, University of Colorado
Aurora, Colorado, United States, 80045
Sponsors and Collaborators
Stanford University
University of Colorado, Denver
Principal Investigator: Bruce A. Buckingham Stanford University
  More Information

Additional Information:
Responsible Party: Bruce A. Buckingham, Principle Investigator, Stanford University Identifier: NCT00884611     History of Changes
Other Study ID Numbers: SU-10162008-1321
Stanford eprotocol # 6789 ( Other Identifier: Stanford University )
Study First Received: April 17, 2009
Last Updated: March 5, 2015

Additional relevant MeSH terms:
Diabetes Mellitus
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases
Hypoglycemic Agents
Physiological Effects of Drugs processed this record on April 28, 2017