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Real-time CGM is superior to flash glucose monitoring for glucose control in type 1 diabetes: The CORRIDA Randomized Controlled Trial

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Hásková, Aneta, Radovnická, Lucie, Petruželková, Lenka, Parkin, Christopher G., Grunberger, George, Horová, Eva, Navrátilová, Vendula, Kádě, Ondřej +3 more·2020·Diabetes Care
DOI 10.2337/dc20-0112PMC PMC7576432
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Abstract

OBJECTIVE: The aim of this trial was to compare the efficacy of real-time and intermittently scanned continuous glucose monitoring (rtCGM and isCGM, respectively) in maintaining optimal glycemic control. RESEARCH DESIGN AND METHODS: In this randomized study, adults with type 1 diabetes (T1D) and normal hypoglycemia awareness (Gold score <4) used rtCGM (Guardian Connect Mobile) or isCGM (FreeStyle Libre) during 4 days of physical activity (exercise phase) and in the subsequent 4 weeks at home (home phase). Primary end points were time in hypoglycemia (<3.9 mmol/L [<70 mg/dL]) and time in range (3.9–10.0 mmol/L [70–180 mg/dL]). The isCGM group wore an additional masked Enlite sensor (iPro2) for 6 days to check for bias between the different sensors used by the rtCGM and isCGM systems. RESULTS: Sixty adults with T1D (mean age 38 ± 13 years; A1C 62 ± 12 mmol/mol [7.8 ± 1.1%]) were randomized to rtCGM (n = 30) or isCGM (n = 30). All participants completed the study. Percentage of time in hypoglycemia (<3.9 mmol/L [<70 mg/dL]) was lower among rtCGM versus isCGM participants in the exercise phase (6.8 ± 5.5% vs. 11.4 ± 8.6%, respectively; P = 0.018) and during the home phase (5.3 ± 2.5% vs. 7.3 ± 4.4%, respectively; P = 0.035). Hypoglycemia differences were significant and most notable during the night. rtCGM participants spent more time in range (3.9–10 mmol/L [70–180 mg/dL]) than isCGM participants throughout both the exercise (78.5 ± 10.2% vs. 69.7 ± 16%, respectively; P = 0.0149) and home (75.6 ± 9.7% vs. 67.4 ± 17.8%, respectively; P = 0.0339) phases. The results were robust to the insignificant bias between rtCGM and isCGM sensors that masked CGM found in the isCGM arm. CONCLUSIONS: rtCGM was superior to isCGM in reducing hypoglycemia and improving time in range in adults with T1D with normal hypoglycemia awareness, demonstrating the value of rtCGM alarms during exercise and in daily diabetes self-management.

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  • Patient preference surveys consistently favored rtCGM systems over isCGM.

    “Patient preference surveys consistently favored rtCGM systems over isCGM (Hašková et al., 2020)”

    From Effectiveness of continuous glucose monitoring systems on glycemic control in adults with type 1 diabetes: A systematic review and meta-analysis (2025) · cites this paper as Hašková et al., 2020

    The Results (Secondary End Points; page unavailable) report no significant between-group differences in quality-of-life measures, but quality of life is not a patient-preference survey. The Procedures and Conclusions passages likewise do not report patient preferences. Searches for preference surveys and whether patients preferred rtCGM over isCGM found no passage addressing the claim. (LLM, conf=0.76)

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  • In adults with type 1 diabetes, real-time CGM with predictive alerts/alarms shows greater benefit than intermittently scanned CGM without predictive alerts/alarms for reducing time spent in hypoglycemia in two randomized controlled trials.

    “In two of the studies, the primary outcome was a reduction in time spent in hypoglycemia, and rtCGM showed greater benefits compared with isCGM (89,90).”

    From 7. Diabetes Technology: Standards of Care in Diabetes—2025 (2025) · cites this paper as [90]

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Authors
Hásková, A., Radovnická, L., Petruželková, L., Parkin, C. G., Grunberger, G., Horová, E., Navrátilová, V., Kádě, O., Matoulek, M., Prázný, M., & Šoupal, J.
Affiliations
  • 3rd Department of Internal Medicine, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
  • Masaryk Hospital, Ústí nad Labem, Czech Republic
  • Charles University (CZ)
  • CGParkin Communications, Inc., Henderson, NV
  • Grunberger Diabetes Institute (US)
Corresponding author
Šoupal, Jan
ORCID
Venue
Diabetes Care
Publisher
American Diabetes Association
Published
2020-08-28
Volume
43
Issue
11
Pages
2744-2750
ISSN
  • 0149-5992 (ISSN-L)
  • 1935-5548
DOI
10.2337/dc20-0112
PMC
PMC7576432
OpenAlex
W3082218057
Cited by
146
References
21
Citations by year
2026: 11 · 2025: 15 · 2024: 28 · 2023: 39 · 2022: 37 · 2021: 15
FWCI
17.16
Type
journal article
Language
en
Open access
Licence
www.diabetesjournals.org/content/license (vor, 53 d)
Locations
  • Diabetes Care (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Agency for Healthcare Research (AZV) of the Czech Republic and Ministry of Health of the Czech Republic (15-26705A)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Education
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
type 1 diabetes, real-time continuous glucose monitoring, intermittently scanned continuous glucose monitoring, glycemic control, hypoglycemia, time in range, physical activity, sensor bias, hypoglycemia awareness, FreeStyle Libre, HbA1c, hypoglycemia risk reduction
MeSH terms
Glycemic Control, Adult, Blood Glucose, Computer Systems, Diabetes Mellitus, Type 1, Female, Glycated Hemoglobin, Humans, Hypoglycemia, Hypoglycemic Agents, Male, Middle Aged, Blood Glucose Self-Monitoring, Exercise, Treatment Outcome, Computers, Handheld

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