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| Name | Class |
|---|---|
| Cystic Fibrosis Foundation | OTHER |
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Nutrition and body composition, the amount of muscle and fat in the body, has a role in overall health. This study wants to learn more about how nutrition and body composition affects health outcomes like glucose tolerance and lung function in patients with cystic fibrosis (CF) who are ages 16-30 years old. 60 adolescents and young adults with CF will be recruited, and 30 volunteers without cystic fibrosis. A total of 40 of these study participants with CF will be asked to return for annual study visits for 2 years after the first visit.
The long-term goal of this study is to use the information collected to make decisions about future nutrition monitoring and interventions which help maintain optimal health for individuals with CF.
This is a prospective, observation study to test the central hypothesis that individuals with cystic fibrosis (CF) have a higher propensity to increased visceral adipose tissue (VAT) accumulation and decreased lean body mass (LBM) compared to healthy controls, and this dysregulation in adipose and protein deposition exacerbates glucose intolerance and lung function decline. A sub-set of participants with CF will be followed longitudinally for two years (n=40). The investigators will conduct detailed body composition, fat distribution, metabolic, and nutritional phenotyping in this cohort. Body fat distribution will be assessed with MRI. Whole body composition will be assessed with DEXA. Glucose tolerance will be assessed with an oral glucose tolerance test (OGTT) and mathematical modeling of the C-peptide and insulin response to glucose. Lung health will be assessed by objective clinical data and self-reported symptoms.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Subjects with Cystic Fibrosis | n=60 patients with CF ages 16-30 | ||
| Healthy Controls | n=30 healthy controls matched to participants with CF for age, sex, BMI, and race. |
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| Measure | Description | Time Frame |
|---|---|---|
| Change in Visceral Adipose Tissue volume (VAT) by Magnetic Resonance Imaging (MRI) | Body fat distribution and body composition in 60 individuals with Cystic Fibrosis (CF) and 30 matched, healthy control will be assessed by Magnetic Resonance Imaging (MRI) | Baseline, 1 year, 2 year |
| Change in Disposition Index | The disposition index (DI) is a measure of the ability of B-cells to compensate for insulin resistance. A lower DI indicates a loss of B-cell function, which means decreased pancreatic function. The disposition index will be assessed with an oral glucose tolerance test (OGTT) and mathematical modeling of the C-peptide and insulin response to glucose. This study seeks to determine if glucose intolerance is associated with body composition and fat distribution in CF subjects. | Baseline, 1 year, 2 year |
| Change in Forced Expiratory Volume in the first second (FEV1%) | Clinical spirometry is a test of lung function that will be used to assess the progression of lung disease with the baseline Forced Expiratory Volume (FEV%) predicted within the past year. Baseline is defined as the average of the best FEV1% for each quarter of the calendar year. FEV1% predicted is a method of determining the severity of pulmonary disease and declines as disease severity increases. | Baseline, 1 year, 2 year |
| Measure | Description | Time Frame |
|---|---|---|
| Change in Pancreatic lipid | Pancreatic lipid contributes to the Visceral Adipose Tissue volume (VAT) and it will me measured with the magnetic resonance imaging (MRI). Participants will lay in the supine position for approximately 30 minutes while in the MRI scanner, and images of the abdominal area (L1-L5 vertebrae) and thigh area will be obtained. Images will later be analyzed for quantification of VAT volume and lipid content of pancreas will be analyzed |
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Inclusion Criteria:
CF inclusion criteria
Longitudinal study inclusion:
CF participants who have normal glucose tolerance results after their initial study oral glucose tolerance test (OGTT).
Healthy controls inclusion criteria:
Exclusion Criteria:
CF exclusion criteria:
Healthy controls exclusion criteria:
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This will be a two-site study of n=60 patients with CF ages 16 years and older and n=30 age-, sex-, BMI-, and race-matched healthy controls. As a sub-study, 40 of these CF subjects will be followed longitudinally and assessed annually for two years.
| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Swati Zaveri, PhD | Contact | 440-778-8373 | swati.shital.zaveri@emory.edu | |
| Jessica A Alvarez, PhD, RD | Contact | 4047271390 | jessica.alvarez@emory.edu |
| Name | Affiliation | Role |
|---|---|---|
| Jessica A Alvarez, PhD, RD | Emory University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Alabama at Birmingham (UAB)/Children's of Alabama | Not yet recruiting | Birmingham | Alabama | 35233 | United States |
Completely de-identified participant data will be shared after publication of all results.
Beginning 9 months following publication of results. No end date.
Researchers who provide a methodologically sound proposal that is approved by all primary study co-investigators.
Types of analyses: To achieve the aims in the approved proposal and for individual participant data-meta analysis.
Proposals should be directed to Dr. Alvarez at jessica.alvarez@emory.edu
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| ID | Term |
|---|---|
| D003550 | Cystic Fibrosis |
| ID | Term |
|---|---|
| D010182 | Pancreatic Diseases |
| D004066 | Digestive System Diseases |
| D008171 | Lung Diseases |
| D012140 | Respiratory Tract Diseases |
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Specimens that remain after completion of the study will be stored for future studies beyond the scope of the current study only if subjects denote the appropriate section of the informed consent form to grant long term storage of samples. Specimens and data will be stored at Emory University within the PI's (Jessica Alvarez) laboratory. Any stored samples will be de-identified with a specific code whose identity can only be accessed by authorized study personnel appointed by the PI.
During the conduct of the study, an individual participant can choose to withdraw consent to have biological specimens stored for future research. However, withdrawal of consent with regard to bio-sample storage may not be possible after the study is completed.
| Baseline, 1 year, 2 year |
| Change in Hepatic lipid | Hepatic lipid contributes to the Visceral Adipose Tissue volume (VAT) and it will me measured with the MRI. Participants will lay in the supine position for approximately 30 minutes while in the MRI scanner, and images of the abdominal area (L1-L5 vertebrae) and thigh area will be obtained. Images will later be analyzed for quantification of VAT volume and lipid content of liver will be analyzed | Baseline, 1 year, 2 year |
| Change in Thigh perimuscular adipose tissue (PMAT) | Thigh PMAT contributes to the VAT and it will me measured with the MRI. Participants will lay in the supine position for approximately 30 minutes while in the MRI scanner, and images of the abdominal area (L1-L5 vertebrae) and thigh area will be obtained. Images will later be analyzed for quantification of VAT volume and Thigh PMAT | Baseline, 1 year, 2 year |
| Change in Body Composition Analysis | Dual-energy X-ray absorptiometry (DEXA) is an imaging technique that provides whole body and regional estimates of the three main body components: fat, lean soft tissues and bone mineral mass. | Baseline, 1 year, 2 year |
| Change in Insulin secretion | Insulin secretion measures the total beta cell response (PhiTot), and will be assessed with an oral glucose tolerance test (OGTT). Fasted blood samples will be drawn 30 minutes and 15 minutes before the initiation of glucose consumption. At time "zero", an oral glucose solution at the dose of 1.75 gm/kg to a maximum of 75 gms will be provided and consumed within 5 minutes of administration. Subsequent blood samples will be drawn at 10, 20, 30, 60, 90, and 120 min following initiation of glucose ingestion. Decreased insulin secretion has been associated with lower B-cell function. | Baseline, 1 year, 2 year |
| Change in Whole body insulin sensitivity index (WBISI) | Insulin sensitivity describes how sensitive the body is to the effects of insulin. Whole body insulin sensitivity index (WBISI) is derived from glucose and insulin levels from the full length of the OGTT. The index is calculated using a formula. Decreased insulin sensitivity index is associated with more advanced CF disease. | Baseline, 1 year, 2 year |
| Annual rate of Forced Expiratory Volume in the first second (FEV1%) decline | FEV1 is the maximal amount of air you can forcefully exhale in one second. It is then converted to a percentage of normal, based on your height, weight, and race. It is assessed when doing the spirometry. | Baseline, 1 year, 2 year |
| Number of pulmonary exacerbations needing intravenous (IV) antibiotics within previous five years | Number of pulmonary exacerbations needing intravenous (IV) antibiotics within previous five years will be recorded. | Baseline |
| Number of Perceived respiratory symptoms measured with the Cystic Fibrosis Questionnaire-Revised (CFQ-R) | The Cystic Fibrosis Questionnaire-Revised (CFQ-R) is a disease-specific instrument, designed to measure impact on overall health, daily life, perceived well-being and symptoms. Scores range from 0 to 100, with higher scores indicating better health. | Baseline, 1 year, 2 year |
| Emory University/Children's Hospital of Atlanta (CHOA) | Recruiting | Atlanta | Georgia | 30322 | United States |
|
| D030342 |
| Genetic Diseases, Inborn |
| D009358 | Congenital, Hereditary, and Neonatal Diseases and Abnormalities |
| D007232 | Infant, Newborn, Diseases |