Real-time Adaptation to Changes in Insulin Sensitivity

NCT01261052 | Completed Phase 2 Results

• 1 other identifier: 2010.005
• Study Type: interventional
• Target: 14
• Locations: 1 country
• Sites: 1

Brief Summary

The purpose of this research study is to test an automated blood glucose control system that includes a new component designed to adapt to stress. The importance of this component is that when Type 1 Diabetics are stressed (for example, from illness or infection), their body is resistant to the effects of insulin. The investigators will be adjusting their blood glucose using insulin and glucagon and making their body less sensitive to insulin with a steroid, hydrocortisone. Insulin is a hormone that lowers blood glucose. Glucagon raises blood glucose when it is low. Both are natural hormones made by people without diabetes. Hydrocortisone is a steroid that will increase their blood glucose temporarily and will be given every 4 hours. All subjects will participate in two 33 hour experiments. One experiment will use the adaptive version of the sensor-based glucose control system. The other study will use the original version of the control system, without the adaptive component, for the first 13 hours. Then, the adaptive component will be added to the glucose control system for the remaining 20 hours of the study. Our primary goal is to assess the effectiveness of the adaptive component to control glucose levels in the presence of steroid-induced insulin resistance in persons with Type 1 Diabetes Mellitus.

Conditions

Type 1 Diabetes Mellitus

Keywords

glucose sensors; artificial pancreas; Diabetes Mellitus

Outcome Measures

Primary Outcomes (1)

• Measurement of the Effectiveness of APD and FMPD/APD Intervention in Adapting to Reduced Insulin Sensitivity

  The effectiveness of the APD and FMPD/APD intervention in adapting to reduced insulin sensitivity was analyzed using mean glucose.

  all 33 hour studies

Secondary Outcomes (1)

• Measurement of APD and FMPD/APD Interventions in Controlling Post-prandial Blood Glucose With Reduced Insulin Sensitivity.

  all 33 hour studies

Study Arms (2)

FMPD/APD intervention

ACTIVE COMPARATOR

Type 1 Diabetes Mellitus subjects who fit the inclusion/exclusion criteria will undergo artificial pancreas closed-loop study for 33 hours. For the first 13 hours, the original artificial pancreas algorithm FMPD, will be used to control the subject's blood glucose. After 13 hours, the adaptive component or APD will be used to control the subject's blood glucose for the remaining 20 hours.

Device: The Fading Memory Proportional Derivative/Adaptive Proportional Derivative Algorithm

APD only intervention

ACTIVE COMPARATOR

Type 1 Diabetes Mellitus subjects who fit the inclusion/exclusion criteria will undergo artificial pancreas closed-loop study for 33 hours. For the entire study, the adaptive component or APD will be used to control the subject's blood glucose.

Device: The Adaptive Proportional Derivative Algorithm

Interventions

The Fading Memory Proportional Derivative/Adaptive Proportional Derivative Algorithm DEVICE

The APD algorithm is based largely on a program that employs the Fading Memory Proportional Derivative (FMPD) insulin and glucagon infusion algorithm. The FMPD algorithm determines insulin and glucagon delivery rates based on proportional error, defined as the difference between the current glucose level and the target level, and the derivative error, defined as the rate of change of the glucose. The "fading memory" designation refers to weighting recent errors more heavily than remote errors. The APD algorithm, like the FMPD algorithm, will determine insulin and glucagon infusion rates based on sensed glucose values and utilizes the derivative and proportional glucose error to determine delivery rates of insulin. However, the APD algorithm has a model predictive element which also leads to frequent measurement of tissue sensitivity to insulin.

FMPD/APD intervention

The Adaptive Proportional Derivative Algorithm DEVICE

The APD algorithm is based largely on a program that employs the Fading Memory Proportional Derivative (FMPD) insulin and glucagon infusion algorithm. The FMPD algorithm determines insulin and glucagon delivery rates based on proportional error, defined as the difference between the current glucose level and the target level, and the derivative error, defined as the rate of change of the glucose. The "fading memory" designation refers to weighting recent errors more heavily than remote errors. The APD algorithm, like the FMPD algorithm, will determine insulin and glucagon infusion rates based on sensed glucose values and utilizes the derivative and proportional glucose error to determine delivery rates of insulin. However, the APD algorithm has a model predictive element which also leads to frequent measurement of tissue sensitivity to insulin.

APD only intervention

Eligibility Criteria

• Age: 21 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Diagnosis of Type 1 Diabetes Mellitus for at least 1 year
• Male or Female subjects 21 to 65 years of age
• Willingness to follow all study procedures, including attending all clinic visits
• Willingness to sign informed consent and HIPAA documents.

You may not qualify if:

• Pregnancy or Lactation: For women of childbearing potential: there is a requirement for a negative urine pregnancy test and for agreement to use contraception during the study and for at least 1 month after participating in the study. Acceptable contraception includes birth control pill / patch / vaginal ring, Depo-Provera, Norplant, an IUD, the double barrier method (the woman uses a diaphragm and spermicide and the man uses a condom), or abstinence.
• Renal insufficiency (serum creatinine of 2.0 mg/dL or greater).
• Serum ALT or AST equal to or greater than 3 times the upper limit of normal; hepatic synthetic insufficiency as defined as a serum albumin of less than 3.3 g/dL; or serum bilirubin of over 2.
• Adrenal insufficiency
• Hematocrit of less than or equal to 34%.
• A history of cerebrovascular disease or coronary artery disease regardless of the time since occurrence.
• Congestive heart failure, NYHA class III or IV.
• Any active infection.
• Visual impairment preventing reading of glucose meter values or continuous glucose monitoring device.
• Physical impairment impeding the ability to use a glucose meter or glucose monitoring device.
• Active foot ulceration.
• Severe peripheral arterial disease characterized by ischemic rest pain or severe claudication.
• Active alcohol abuse, substance abuse, or severe mental illness (as judged by the principal investigator).
• Active malignancy, except basal cell or squamous cell skin cancers.
• Major surgical operation within 30 days prior to screening.

Sponsors & Collaborators

• Legacy Health System: lead
• Juvenile Diabetes Research Foundation: collaborator

Study Sites (1)

Legacy Good Samaritan Hospital

Portland, Oregon, 97210, United States

Location

Related Publications (1)

• Castle JR, Engle JM, El Youssef J, Massoud RG, Yuen KC, Kagan R, Ward WK. Novel use of glucagon in a closed-loop system for prevention of hypoglycemia in type 1 diabetes. Diabetes Care. 2010 Jun;33(6):1282-7. doi: 10.2337/dc09-2254. Epub 2010 Mar 23.

  PMID: 20332355 BACKGROUND

MeSH Terms

Conditions

Diabetes Mellitus, Type 1; Diabetes Mellitus

Condition Hierarchy (Ancestors)

Glucose Metabolism Disorders; Metabolic Diseases; Nutritional and Metabolic Diseases; Endocrine System Diseases; Autoimmune Diseases; Immune System Diseases

Results Point of Contact

• Title: Dr. W Kenneth Ward
• Organization: Legacy Health System

kenward503@msn.com

503-413-5171

Study Officials

• W K Ward, MD

  Legacy Health Research

  PRINCIPAL INVESTIGATOR

Publication Agreements

• PI is Sponsor Employee: Yes

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Purpose: TREATMENT
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Senior Scientist

Study Record Dates

• First Submitted: December 15, 2010
• First Posted: December 16, 2010
• Study Start: November 1, 2010
• Primary Completion: April 1, 2011
• Study Completion: April 1, 2011
• Last Updated: December 3, 2012
• Results First Posted: November 29, 2012

Record last verified: 2012-11

Locations

US (1)