Comparison of Continous Glucose Monitor and OGTT as a Screen for Cystic Fibrosis Related Diabetes and Impaired Glucose Tolerance
Medical College of Wisconsin
Summary
Cystic Fibrosis (CF) related diabetes (CFRD) is a unique form of diabetes mellitus, different from type 1 diabetes and type 2 diabetes. The diagnosis of CFRD is associated with a decline in pulmonary function, decreased nutritional status, and increased mortality. CFRD is extremely common in people with CF, occurring in approximately 40-50% of adults with CF. Impaired glucose tolerance or dysglycemia is also very common in CF. It is standard of care to screen for CFRD annually from the age of 10 years with a two-hour Oral Glucose Tolerance Test (OGTT) with 75 g dextrose. The gold standard screening for CFRD is the OGTT which is problematic as it is time consuming for patient and staff and adherence to annual screening is low among CF centers. Survival has improved dramatically with the advent of CFTR modulators and it is presumed that the incidence of CFRD will increase with increased life expectancy. The Cystic Fibrosis Foundation (CFF) has developed the oldest disease specific patient registry, consisting of approximately 35000 patients, so there is vast historical information available on individual patients and larger datasets on the CF community as a whole. Based on the 2021 CFF patient registry data, the current life expectancy for CF patients born between 2017 and 2021 is 53 years - a 15 year increase from a decade ago.
Description
Research design and methods * Clinic will continue to follow CFF standard of care guidelines. Subjects will complete the annual OGTT and an annual HgbA1c. * Sample Dexcom G7 Sensors will be provided to the subjects for 10 day wear during a routine CF clinic appointment. * The clinic RD will provide education on sensor application and assist the subjects in applying the sensors during the CF clinic visit. * The clinic RD will assist subjects with install of phone applications (Dexcom G7 and Dexcom Clarity) to track data and produce reports. The interpretation of reports will be reviewed with t…
Eligibility
- Age range
- 18+ years
- Sex
- All
- Healthy volunteers
- No
Inclusion Criteria: 1. An adult patient, diagnosed with CF, established with Froedtert Multidisciplinary CF Clinic. 2. Normal glucose tolerance or impaired glucose tolerance per OGTT completed in 2024. 3. At healthy baseline status at time of CGM wear and OGTT. Exclusion Criteria: 1. Diagnosed with CFRD and treating with diabetogenic medications. 2. s/p transplant 3. pregnancy 4. failure to wear CGM for entirety of 10 days
Interventions
- DeviceAccess to Dexcom G7 CGM Data
Eligible patients will undergo Continuous Glucose Monitoring using the Dexcom G7
Location
- The Medical College of WisconsinMilwaukee, Wisconsin