Conditions: Cystic Fibrosis Related Diabetes Pancreatic Insufficiency
Keywords: Cystic Fibrosis Diabetes Cystic Fibrosis Related Diabetes Pre-diabetes oral hypoglycemic agents Repaglinide treatment inflammatory markers Lung function nutrition
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 31
Healthy volunteers: no

Brief summary:
The purpose of this study is to provide the necessary data and experience to design a larger, full scale clinical trial to determine if a certain medicine (repaglinide), which increases the amount of insulin secreted by the pancreas, can improve the nutritional status and pulmonary function of adolescents and young adults with cystic fibrosis and prediabetes by improving blood glucose control. The investigators are also trying to determine the relationship between systemic inflammatory factors and glucose impairment.

Detailed description:
As people with Cystic Fibrosis (CF) are living well into adulthood new complications are arising. CF-Related Diabetes (CFRD) has emerged as a major complication. Years prior to the diagnosis of CFRD, patients have decreasing insulin secretion, glucose intolerance, deteriorating pulmonary function, and nutritional impairment. There are no current standard recommendations for the treatment of CF patients with prediabetes, and there is little evidence that treatment of this prediabetic state in CF patients will prevent the deterioration of the lung function, nutritional status and potentially slow the progression to manifest CFRD.

To determine the feasibility of testing this hypothesis, we will perform a pilot, double-blinded, randomized controlled trial in 20 CF pancreatic insufficient patients ages of 12 to 24 years old with impaired glucose tolerance test (IGT) or CFRD without fasting hyperglycemia (CFRD-No FH) and assign them to either placebo or Repaglinide 0.5 mg PO 3 - 4 times a day before meals for two years. Patients will monitor their blood glucose daily and will be followed every 3 months for 2 years to determine changes in nutritional status by BMI and DEXA, lung function tests, frequency of hospitalizations, antibiotic courses, and degree of glucose tolerance, insulin secretion and insulin sensitivity.

In addition, based on the evidence of increased inflammation in type 2 diabetes, correlation of systemic inflammatory response at different degrees of glucose tolerance and after treatment, will be assessed in these subjects, as well as in another 20 CF pancreatic insufficient matched patients with normal glucose tolerance who will be studied once without intervention

Arms:
arm 1: 1 pill before each meal 3-4 times a day for 2 years. All subjects had abnormal glucose tolerance. Subjects were randomized to placebo or drug. arm 2: repaglinide 0.5 mg before each meal 3-4 times a day for 2 years. All subjects had abnormal glucose tolerance.Subjects were randomized to placebo or drug.

Interventions: intervention 1: placebo intervention 2: repaglinide
Intervention descriptions: intervention 1: CF pancreatic insufficient patients with impaired glucose tolerance (IGT) or CFRD without fasting hyperglycemia (CFRD-No FH) by OGTT will be treated with placebo by taking 1 pill before each meal that contains more than 20 grams of carbohydrate 3-4 times a day for 2 years. intervention 2: CF pancreatic insufficient patients with impaired glucose tolerance (IGT) or CFRD without fasting hyperglycemia (CFRD-No FH) by OGTT will be treated with repaglinide 0.5 mg before each meal that contains more than 20 grams of carbohydrate 3-4 times a day for 2 years.

Protocol document: