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Effectiveness and Safety Study of the DexCom™ G4 Continuous Glucose Monitoring System

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01111370
Recruitment Status : Completed
First Posted : April 27, 2010
Results First Posted : March 27, 2017
Last Update Posted : March 27, 2017
Information provided by (Responsible Party):
DexCom, Inc.

Brief Summary:

The purpose of this study is to evaluate the safety and effectiveness of the G4 System when worn for up to 7-days by subjects >18 years-old with diabetes mellitus requiring insulin.

Device performance will be primarily evaluated in terms of the proportion of G4 System values that are within ±20% of YSI reference value for glucose levels >80 mg/dL and ±20 mg/dL at meter glucose levels <80 mg/dL. These G4-YSI matched pairs will be collected during in-clinic sessions on Days 1, 4, and 7 of Sensor wear. The proportion of matched pairs from this study (PTL-900360) meeting the above criteria will be compared to the proportion of such points observed in the DexCom clinical study that supported approval of the SEVEN PLUS System (PTL 300012).

Safety data of the G4 System will also be collected and safety will be characterized by the incidence of Adverse Device Effects, Serious Adverse Device Events, and Unanticipated Adverse Device Effects experienced by study participants.

Condition or disease Intervention/treatment Phase
Diabetes Mellitus Device: DexCom™ G4 Continuous Glucose Monitoring System Not Applicable

Detailed Description:

This will be a non-randomized, single-armed study conducted in the United States. Following screening, a minimum of 60 to a maximum of 80 subjects at up to 4 clinical sites will be enrolled. All participants will wear the G4 Sensor for one 7-day wear period (~168 hours). A subset of 20-30 subjects will wear two G4 Systems (one of which will be blinded) during the 7-day wear period for the purposes of assessing precision. During home use, subjects will be asked to use the meter provided to them to take fingersticks for calibration and diabetes management. Subjects will also be asked to confirm high and low G4 System glucose alerts/alarms by taking a comparative fingerstick immediately after receiving an alert/alarm.

All subjects will participate in one, 8-hour in-clinic session on Day 1, 4, or 7 of the study to collect accuracy information against a laboratory standard (YSI) and against SMBG. During the in-clinic session, subjects will have venous blood draws for evaluation of the YSI blood glucose measurements. Carbohydrate consumption and insulin dosing may be manipulated during the in-clinic session to ensure a wide range of glucose values. For the duration of this study, subjects will be instructed to use G4 System information as an adjunct to (and not as a replacement for) standard SMBG guidance of diabetes self-management.

Subjects will perform G4 Sensor insertions at the clinic under supervision of study staff. Sensor insertion sites will be examined after removal of the Sensor(s). Study staff will document any irritation and/or Adverse Device Effects.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 60 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Other
Official Title: Effectiveness and Safety Study of the DexCom™ G4 Continuous Glucose Monitoring System
Study Start Date : February 2010
Actual Primary Completion Date : April 2010
Actual Study Completion Date : April 2010

Resource links provided by the National Library of Medicine

Drug Information available for: Dextrose

Arm Intervention/treatment
Experimental: CGM
continuous glucose monitoring system
Device: DexCom™ G4 Continuous Glucose Monitoring System
Continuous Glucose Monitoring System
Other Name: Continuous Glucose Monitoring System

Primary Outcome Measures :
  1. the Proportion of G4 CGM System in Agreement With the Reference Standard [ Time Frame: Assessment done on either Day 1, 4 or 7 of the sensor wear period ]
    The proportion of G4 System values within (±) 20% of YSI reference value for glucose levels >80 mg/dL and (±) 20 mg/dL at YSI glucose levels <80 mg/dL. This is primarayly laboratory measurement outcome,and it is not measured by clinical outcome, for example, diagnosis, treatement and complication, and clinical effectiveness, etc.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Age 18 years or older;
  2. Have been diagnosed with insulin-requiring diabetes and are on multiple daily injections (MDI) or Continuous Subcutaneous Insulin Infusion (CSII) insulin therapy;
  3. Willing not to inject insulin or wear an insulin pump insertion set within 3 inches from the Sensor site during Sensor wear;
  4. Willing to use only the blood glucose meter provided to them for self-monitoring of blood glucose (SMBG) during Sensor wear;
  5. Willing to participate in one, 8-hour in-clinic session and be willing to take 4 fingersticks per hour and have 4 blood draws per hour for the entire 8-hour duration;
  6. Willing to take a minimum of 6 fingersticks per day during home use (2 for calibration purposes, 4 for comparative purposes);
  7. Willing to refrain from the use of acetaminophen during the Sensor insertion period and for at least 24-hours prior to Sensor insertion;
  8. Willing not to schedule a magnetic resonance (MRI) scan, computed tomography (CT) scan, or x-ray, for the duration of the study;
  9. Able to speak, read, and write English.

Exclusion Criteria:

  1. Have extensive skin changes/diseases that preclude wearing the Sensor on normal skin (e.g. extensive psoriasis, recent burns or severe sunburn, extensive eczema, extensive scarring, extensive tattoos, dermatitis herpetiformis) at the proposed wear sites;
  2. Subjects who have a known allergy to medical-grade adhesives;
  3. Are pregnant as demonstrated by a positive pregnancy test within 72 hours of insertion;
  4. Have a hematocrit that is less than 30%, or greater than 55%;
  5. Current participation in another investigational study protocol (if a subject has recently completed participation in another drug study, the subject must have completed that study at least 30 days prior to being enrolled in this study);
  6. Have any condition that, in the opinion of the Investigator, would interfere with their participation in the trial or pose an excessive risk to study staff handling venous blood samples (e.g., known history of hepatitis B or C).

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01111370

Sponsors and Collaborators
DexCom, Inc.
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Study Chair: Andrew Balo DexCom, Inc.

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Responsible Party: DexCom, Inc. Identifier: NCT01111370    
Other Study ID Numbers: PTL900360
First Posted: April 27, 2010    Key Record Dates
Results First Posted: March 27, 2017
Last Update Posted: March 27, 2017
Last Verified: August 2015
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by DexCom, Inc.:
diabetes mellitus requiring insulin
Additional relevant MeSH terms:
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Diabetes Mellitus
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases