Clinical trial NCT02530450: Continuous Glucose Monitor in Children With Poorly Controlled Diabetes
Official title: iPro Continuous Glucose Monitor in Children With Poorly Controlled Diabetes: A 6-Month, Randomized, Interventional Pilot Study
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Type 1 Diabetes Mellitus
Keywords: children
poor adherence
continuous glucose monitoring
Lead sponsor: The University of Texas Health Science Center at San Antonio
Sponsor class: OTHER
Collaborators: name: Medtronic Diabetes
First posted: 2015-08-21
Enrollment: 30
Sex: ALL
Minimum age (years): 7
Maximum age (years): 17
Standard ages: CHILD
Accepts healthy volunteers: no
Observational model: CASE_CROSSOVER
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Subjects are pediatric, with a clinical diagnosis of diabetes for at least 6 months, who have been treated in the diabetic clinic for at least 3 months previously.

Brief summary: The purpose of this study is to determine if the use of continuous glucose monitoring in a practical outpatient clinic setting in children with poorly controlled diabetes will lead to improved blood sugar control.

Detailed description: The trial was designed as a six month, randomized, prospective, interventional pilot study of children with uncontrolled (HgbA1c \> 8.5%) diabetes who were between the ages of 7-17 years of age. The purpose of the study was to determine the effect in glycemic control as measured by HgbA1c with use of iPro™ CGM at regularly scheduled clinic appointments. Recruitment for this study was limited to patients at the University of Texas Health Science Center in San Antonio Pediatric Diabetes Clinic from May 2011 to March 2013. Subjects were randomized into Group1 or Group 2 using sequentially numbered, opaque sealed envelopes (SNOSE).

All subjects had point-of-care HgbA1c (standard of care) and CGM data collected at time points 0, 3 months, and 6 months. After a regularly scheduled clinic appointment, all subjects and families at time 0 were counseled by a registered dietician regarding carbohydrate counting with a focus on minimizing errors in carbohydrate estimation, as is standard of care for patients with poorly controlled diabetes in our clinic. At time 0, subjects in both Group 1 and 2 had CGM placement after meeting with the dietician. Group 1 subjects were blinded to the first CGM data, meaning that they did not review the CGM download data. Group 2 was scheduled to return to clinic within 2 weeks of placement to meet with a pediatric endocrinologist involved in the study to interpret the CGM results and make adjustments to insulin regimen if appropriate. Both Groups 1 and 2 were not blinded to CGM data at 3 months and 6 months. Again, the CGM was placed after their regularly scheduled diabetes clinic appointments and all families returned within 2 weeks of these visits to meet with the pediatric endocrinologist to interpret the data and adjust the insulin regimen if necessary.

The iPro™ CGM was worn for a minimum of 48 hours (2 days), maximum 96 hours (4 days). Participants were instructed to complete a minimum of 4 SMBG records daily while wearing the iPro™ CGM for system calibration purposes. Subjects documented SMBGs, meal times, carbohydrate intake, insulin doses, exercise, and any hypoglycemic symptoms in a log book for correlation to CGM data.

Eligibility criteria: Inclusion Criteria:

1. Clinical diagnosis of diabetes for at least 6 months, type 1 or type 2 diabetes.
2. Treated at UT Health Science Center pediatric diabetes clinic for at least the previous 3 months.
3. HgbA1c \>8.5% (equivalent to average BG of \>205 mg/dL for past three months).
4. Supportive family with willingness to self monitoring blood glucose values at least 4 times per day during study.
5. Supportive family with willingness to participate in continuous glucose monitoring (CGM) for at least 48 hours including self monitoring blood glucose values at least 4 times per day, documenting meals, carbohydrates eaten, insulin dose given, exercise, and hypoglycemic symptoms.
6. Attend proposed clinic, nutritional, and CGM follow up visits.
7. Pump or multiple daily injection (MDI) insulin therapy (3-4 injections minimum daily). If on pump, on pump for at least the past 3 months. Current insulin regimen involves basal/ bolus therapy with no plans to switch the modality of insulin administration during the study (e.g., injection user switching to a pump, pump user switching to injections).
8. Hypoglycemic unawareness.
9. English or Spanish primary language.

Exclusion Criteria:

1. Medications known to affect glycemic control (oral steroids, growth hormone, psychotropics).
2. Documented concomitant chronic disease known to affect glycemic control.
3. 3 or more incidents in the last 12 months of severe hypoglycemia with documented blood glucose below 50mg/dL (if possible), resulting in unconsciousness, hospitalization or third party assistance, where recovery follows treatment with glucose or glucagon or similar.
4. 3 or more incidents in the last 12 months of diabetic ketoacidosis (DKA).
5. Reported alcohol or drug abuse.
6. Documented cutaneous allergy to latex products.
7. Documented eating disorders or morbid obesity as assessed by the investigator.
8. Any other medical, social or psychological condition that, in the investigator's opinion, makes the patient unable to comply with the study protocol and all study procedures.
9. Home use of CGM in the past 6 months.

Primary outcomes:
measure: The Primary Outcome Measure Was Change in HgbA1c
timeFrame: 0 months, 3 months and 6 months
Secondary outcomes:
measure: % Time Spent in Hypoglycemia, Hyperglycemia, and Euglycemia
timeFrame: 3 months and 6 months
Other outcomes:
Locations:
Study officials:
affiliation: UT Health Science Center San Antonio
name: Maria Rayas, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Maahs DM, West NA, Lawrence JM, Mayer-Davis EJ. Epidemiology of type 1 diabetes. Endocrinol Metab Clin North Am. 2010 Sep;39(3):481-97. doi: 10.1016/j.ecl.2010.05.011.
citation: Diabetes Control and Complications Trial Research Group; Nathan DM, Genuth S, Lachin J, Cleary P, Crofford O, Davis M, Rand L, Siebert C. The effect of intensive treatment of diabetes on the development and progression of long-term complications in insulin-dependent diabetes mellitus. N Engl J Med. 1993 Sep 30;329(14):977-86. doi: 10.1056/NEJM199309303291401.
citation: Nathan DM, Cleary PA, Backlund JY, Genuth SM, Lachin JM, Orchard TJ, Raskin P, Zinman B; Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications (DCCT/EDIC) Study Research Group. Intensive diabetes treatment and cardiovascular disease in patients with type 1 diabetes. N Engl J Med. 2005 Dec 22;353(25):2643-53. doi: 10.1056/NEJMoa052187.
citation: Borus JS, Laffel L. Adherence challenges in the management of type 1 diabetes in adolescents: prevention and intervention. Curr Opin Pediatr. 2010 Aug;22(4):405-11. doi: 10.1097/MOP.0b013e32833a46a7.
citation: Boland E, Monsod T, Delucia M, Brandt CA, Fernando S, Tamborlane WV. Limitations of conventional methods of self-monitoring of blood glucose: lessons learned from 3 days of continuous glucose sensing in pediatric patients with type 1 diabetes. Diabetes Care. 2001 Nov;24(11):1858-62. doi: 10.2337/diacare.24.11.1858.
citation: Gandrud LM, Xing D, Kollman C, Block JM, Kunselman B, Wilson DM, Buckingham BA. The Medtronic Minimed Gold continuous glucose monitoring system: an effective means to discover hypo- and hyperglycemia in children under 7 years of age. Diabetes Technol Ther. 2007 Aug;9(4):307-16. doi: 10.1089/dia.2007.0026.
citation: Bode BW, Gross TM, Thornton KR, Mastrototaro JJ. Continuous glucose monitoring used to adjust diabetes therapy improves glycosylated hemoglobin: a pilot study. Diabetes Res Clin Pract. 1999 Dec;46(3):183-90. doi: 10.1016/s0168-8227(99)00113-8.
citation: Tanenberg R, Bode B, Lane W, Levetan C, Mestman J, Harmel AP, Tobian J, Gross T, Mastrototaro J. Use of the Continuous Glucose Monitoring System to guide therapy in patients with insulin-treated diabetes: a randomized controlled trial. Mayo Clin Proc. 2004 Dec;79(12):1521-6. doi: 10.4065/79.12.1521.
citation: Chetty VT, Almulla A, Odueyungbo A, Thabane L. The effect of continuous subcutaneous glucose monitoring (CGMS) versus intermittent whole blood finger-stick glucose monitoring (SBGM) on hemoglobin A1c (HBA1c) levels in Type I diabetic patients: a systematic review. Diabetes Res Clin Pract. 2008 Jul;81(1):79-87. doi: 10.1016/j.diabres.2008.02.014. Epub 2008 Apr 15.
citation: Kaufman FR, Gibson LC, Halvorson M, Carpenter S, Fisher LK, Pitukcheewanont P. A pilot study of the continuous glucose monitoring system: clinical decisions and glycemic control after its use in pediatric type 1 diabetic subjects. Diabetes Care. 2001 Dec;24(12):2030-4. doi: 10.2337/diacare.24.12.2030.
citation: Ludvigsson J, Hanas R. Continuous subcutaneous glucose monitoring improved metabolic control in pediatric patients with type 1 diabetes: a controlled crossover study. Pediatrics. 2003 May;111(5 Pt 1):933-8. doi: 10.1542/peds.111.5.933.
citation: Lagarde WH, Barrows FP, Davenport ML, Kang M, Guess HA, Calikoglu AS. Continuous subcutaneous glucose monitoring in children with type 1 diabetes mellitus: a single-blind, randomized, controlled trial. Pediatr Diabetes. 2006 Jun;7(3):159-64. doi: 10.1111/j.1399-543X.2006.00162.x.
citation: Schaepelynck-Belicar P, Vague P, Simonin G, Lassmann-Vague V. Improved metabolic control in diabetic adolescents using the continuous glucose monitoring system (CGMS). Diabetes Metab. 2003 Dec;29(6):608-12. doi: 10.1016/s1262-3636(07)70076-9.
citation: Ryan EA, Germsheid J. Use of continuous glucose monitoring system in the management of severe hypoglycemia. Diabetes Technol Ther. 2009 Oct;11(10):635-9. doi: 10.1089/dia.2009.0042.
citation: Hood KK, Rohan JM, Peterson CM, Drotar D. Interventions with adherence-promoting components in pediatric type 1 diabetes: meta-analysis of their impact on glycemic control. Diabetes Care. 2010 Jul;33(7):1658-64. doi: 10.2337/dc09-2268.
citation: Stanger C, Ryan SR, Delhey LM, Thrailkill K, Li Z, Li Z, Budney AJ. A multicomponent motivational intervention to improve adherence among adolescents with poorly controlled type 1 diabetes: a pilot study. J Pediatr Psychol. 2013 Jul;38(6):629-37. doi: 10.1093/jpepsy/jst032. Epub 2013 May 22.
citation: Mulvaney SA, Hood KK, Schlundt DG, Osborn CY, Johnson KB, Rothman RL, Wallston KA. Development and initial validation of the barriers to diabetes adherence measure for adolescents. Diabetes Res Clin Pract. 2011 Oct;94(1):77-83. doi: 10.1016/j.diabres.2011.06.010. Epub 2011 Jul 7.
citation: Telo GH, Volkening LK, Butler DA, Laffel LM. Salient characteristics of youth with type 1 diabetes initiating continuous glucose monitoring. Diabetes Technol Ther. 2015 Jun;17(6):373-8. doi: 10.1089/dia.2014.0290. Epub 2015 Mar 6.