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Continuous Glucose Monitoring Parameter and Oral Glucose Tolerance Testing (OGTT) Parameters in Children and Young Adults With Cystic Fibrosis (CF)

9. november 2026 oppdatert av: Northwell Health

As modulator therapies extend the lifespan of CF patients, the detection of complications like Cystic Fibrosis Related Diabetes (CFRD) becomes increasingly vital. The current gold standard for CFRD screening, the 2-hour OGTT, is cumbersome and suffers from low compliance. This study proposes that Continuous Glucose Monitoring (CGM) could offer a more comprehensive, easier, and potentially more compliant screening method. The research aims to correlate various CGM parameters (e.g., time in hyperglycemia) with traditional glycemic markers like OGTT glucose levels, GMI, average glucose, variability, and HbA1c. Additionally, the research seeks to understand patient and parent/guardian preferences for CFRD screening modalities. This prospective observational study will involve CF patients wearing a Dexcom CGM around the time of standard OGTT and HbA1c tests, followed by surveys, with the ultimate goal of paving the way for CGM to improve early detection and management of dysglycemia in CF children.

Studieoversikt

Status

Rekruttering

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

As modulator therapy changes the landscape of cystic fibrosis (CF), children with CF will live longer and healthier lives with less pulmonary exacerbations. Still, other complications like Cystic Fibrosis Related Diabetes and underlying dysglycemia may become more apparent as lifespans of CF patients increase. It is therefore essential that clinicians have the tools to understand early stages of dysglycemia to prevent long term complications of CFRD. At present, 2 hours 75-gram OGTT remains the gold standard annual screen for CFRD. This test is both cumbersome for patients and limits a clinician's interpretation of glycemic control to a limited time frame. Although OGTT is currently used to diagnose CFRD, it can be cumbersome for patients and time consuming. OGTT compliance is therefore not surprisingly low in the CF population with about 49 % of CF centers having a more than 50% completion of annual OGTT. Continuous glucose monitoring (CGM), on the other hand, offers the ability to obtain more data on longer time periods in a much easier fashion. Thus, CGMs have the potential to glean a more fine-tuned understanding of a patient's glycemic control. Moreover, CGMs can make glycemic testing easier on patients, thereby increasing compliance of annual glycemic testing. The investigators hypothesize the correlation of CGM parameters of hyperglycemia like % of time > 180 mg/dl, % of time> 150 mg/dL with 1- and 2-hour OGTT glucose levels, Glucose Management Indicator (GMI), average glucose, glucose variability, and HbA1c levels. The investigators also aim to explore patient views and preferences of OGTT and CGM for screening of CFRD through surveys after CGM wear.

The investigators hope to be able to correlate 1- and 2-hour glucose values on OGTT to % in range parameters on a continuous glucose monitor. This will pave the way to better understand glycemic control in children with CF and risk for CFRD with data from a CGM even without an OGTT in the future. The investigators also hope to understand patient and parent/guardian preferences towards CFRD screening modalities.

Study Design: Prospective observational study. Eligible patients will have a CGM placed for up to10-day wear within the 3 months before or after clinically appropriate OGTT and A1c. OGTT testing will include 1- and 2-hour glucose levels and HbA1c as per standard of care. A Dexcom CGM will be placed in clinic onto the subjects upper arm. Survey exploring patient and parent/guardian preference will be provided after the CGM is removed.

Studietype

Intervensjonell

Registrering (Antatt)

30

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studiesteder

    • New York
      • New York, New York, Forente stater, 11042
        • Rekruttering
        • Northwell Health
        • Ta kontakt med:

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

10 år til 25 år (Barn, Voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Beskrivelse

Inclusion Criteria:

  1. Patients with Cystic Fibrosis
  2. 10-25 years of age who have obtained or will obtain a OGTT within 3 months of recruitment and CGM placement.

Exclusion Criteria:

  1. Diagnosis of diabetes mellitus type 1 or type 2
  2. Use of the following medication: steroid course, Metformin therapy,
  3. Concurrent CV disease or malignancy, kidney failure, lung transplant.
  4. Does not have access to personal Bluetooth device compatible with Dexcom G7 application.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Screening
  • Tildeling: N/A
  • Intervensjonsmodell: Enkeltgruppeoppdrag
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: Pediatric Cystic Fibrosis Patients Undergoing Concurrent CGM Monitoring and OGTT Testing

Pediatric Cystic Fibrosis patients (ages 10-25 years) will wear a continuous glucose monitor (Dexcom G7) for up to 10 days within 3 months of an annual Oral Glucose Tolerance Test (OGTT) and complete a survey to evaluate correlations between CGM parameters and OGTT values and assess patient/guardian preferences for CFRD screening methods.

Continuous glucose monitors, such as Dexcom, have been established as a standard component of clinical care for continuous blood glucose monitoring. These devices are widely utilized in diabetes management clinics and demonstrate a robust safety and efficacy profile. The intervention also includes administration of a patient preference survey as outlined in the study protocol.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Average Blood Glucose Level from Continuous Glucose Monitoring
Tidsramme: Up to 10 days of CGM wear (within 3 months of the Oral Glucose Tolerance Test).

Mean glucose level recorded over the continuous glucose monitoring (CGM) wear period (mg/dL)

Up to 10 days of CGM wear (within 3 months of the Oral Glucose Tolerance Test).

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Percentage of Time Glucose Exceeds 150 mg/dL from Continuous Glucose Monitoring
Tidsramme: Up to 10 days of CGM wear (within 3 months of the Oral Glucose Tolerance Test).

The proportion of time during the CGM wear period that glucose levels were above 150 mg/dL (%)

Up to 10 days of CGM wear (within 3 months of the Oral Glucose Tolerance Test).
Percentage of Time Glucose Exceeds 180 mg/dL from Continuous Glucose Monitoring
Tidsramme: Up to 10 days of CGM wear (within 3 months of the Oral Glucose Tolerance Test).

The proportion of time during the CGM wear period that glucose levels were above 180 mg/dL (%)

Up to 10 days of CGM wear (within 3 months of the Oral Glucose Tolerance Test).
Fasting Plasma Glucose Level from Oral Glucose Tolerance Test
Tidsramme: Single measurement at the start of the OGTT (within 3 months of CGM wear).

Plasma glucose level measured after an overnight fast, as part of the Oral Glucose Tolerance Test (OGTT) (mg/dL)

Single measurement at the start of the OGTT (within 3 months of CGM wear).
1 hour Plasma Glucose Level from Oral Glucose Tolerance Test
Tidsramme: Single measurement 1 hour after glucose load (within 3 months of CGM wear).

Plasma glucose level measured 1 hour after glucose administration as part of the Oral Glucose Tolerance Test (OGTT) (mg/dL)

Single measurement 1 hour after glucose load (within 3 months of CGM wear).
2-Hour Plasma Glucose Level from Oral Glucose Tolerance Test
Tidsramme: Single measurement 2 hours after glucose load (within 3 months of CGM wear).

Plasma glucose level measured 2 hours after glucose load administration during the OGTT (mg/dL)

Single measurement 2 hours after glucose load (within 3 months of CGM wear).
Forced Expiratory Volume in 1 Second (FEV1) as a Percentage of Predicted
Tidsramme: Within 3 months of CGM placement (standard of care assessment).

Lung function parameter reflecting the volume of air exhaled in the first second during a forced breath, expressed as a percentage of the predicted value. (%)

Within 3 months of CGM placement (standard of care assessment).
Forced Vital Capacity (FVC) as a Percentage of Predicted
Tidsramme: Within 3 months of CGM placement (standard of care assessment).

Lung function parameter reflecting the total volume of air exhaled during a forced breath, expressed as a percentage of the predicted value (%)

Within 3 months of CGM placement (standard of care assessment).
Hemoglobin A1c (HbA1c) Level
Tidsramme: At the time of OGTT (within 3 months of CGM wear).

A measure of average blood glucose level (%)

At the time of OGTT (within 3 months of CGM wear).
Body Mass Index (BMI) Z-Score
Tidsramme: Within 3 months of CGM placement (standard of care assessment).

Age- and sex-adjusted Body Mass Index standardized score, reflecting nutritional status (z-score)

Within 3 months of CGM placement (standard of care assessment).
Response to Survey Question on CFRD Screening Preferences
Tidsramme: After 10 days of CGM wear

Participant's (and/or parent/guardian's) response to the Likert scale questions regarding preferences for Cystic Fibrosis Related Diabetes

After 10 days of CGM wear

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Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

23. juni 2025

Primær fullføring (Antatt)

1. august 2027

Studiet fullført (Antatt)

1. august 2027

Datoer for studieregistrering

Først innsendt

29. juni 2026

Først innsendt som oppfylte QC-kriteriene

9. november 2026

Først lagt ut (Faktiske)

12. november 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

12. november 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

9. november 2026

Sist bekreftet

1. oktober 2026

Mer informasjon

Begreper knyttet til denne studien

Andre studie-ID-numre

  • 24-0945-CCMC

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Ja

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