Impact of factory-calibrated Freestyle Libre System with new glucose algorithm measurement accuracy and clinical performance in children with type 1 diabetes during summer camp.
Pediatr Diabetes
; 22(2): 261-270, 2021 03.
Article
em En
| MEDLINE
| ID: mdl-33034075
ABSTRACT
BACKGROUND:
Factory-calibrated intermittently-scanned Continuous Glucose Monitoring (isCGM) device FreeStyle Libre (FSL) has recently received improvements in its glucose tracking algorithm and calibration procedures, which are claimed to have improved its accuracy.OBJECTIVE:
To compare the accuracy of two generations of 14-days FSL devices (A in 2016, B in 2019) to self-monitored blood glucose measurements (SMBG) in children with type 1 diabetes in real-life conditions during a summer camp. MATERIALS ANDMETHODS:
Two largely independent groups of youth with type 1 diabetes took part in summer camps. In 2016 they used FSL-A, in 2019 FSL-B. On scheduled days, participants performed supervised 8-point glucose profiles with FSL and SMBG. The accuracy vs SMBG was assessed with mean absolute relative difference (MARD) and clinical surveillance error grid (SEG).RESULTS:
We collected 1655 FSL-SMBG measurement pairs from 78 FSL-A patients (age 13 ± 2.3 years old; HbA1c 7.6 ± 0.8%) and 1796 from 58 in FSL-B group (age 13.8 ± 2.3 years old, HbA1c 7.5 ± 1.1%)-in total 3451 measurements. FSL-B displayed lower MARD than FSL-A (11.3 ± 3.1% vs 13.7 ± 4.6%, P = .0003), lower SD of errors (20.2 ± 6.7 mg/dL vs 24.1 ± 9.6 mg/dL, P = .0090) but similar bias (-7.6 ± 11.8 mg/dL vs -6.5 ± 8 mg/dL, P = .5240). Both FSL-A and FSL-B showed significantly higher MARD when glycaemia was decreasing >2 mg/dL/min (FSL-A22.3 ± 18.5%; FSL-B17.9 ± 15.8%, P < .0001) compared with stable conditions (FSL-A 11.4 ± 10.4%, FSL-B10.1 ± 9.1%) and when the system could not define the glycaemic trend (FSL-A16.5 ± 16.3%; FSL-B15.2 ± 14.9%, P < .0001). Both generations demonstrated high percentage of A-class and B-class results in SEG (FSL-A 96.4%, FSL-B 97.6%) with a significant shift from B (decrease by 3.7%) to A category (increase by 3.9%) between generations (FSL-A 16/80.4%; FSL-B12.3/85.3%, P = .0012).CONCLUSION:
FSL-B demonstrated higher accuracy when compared to FSL-A However, when glycemia is decreasing or its trend is uncertain, the verification with a glucose meter is still advisable.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Glicemia
/
Algoritmos
/
Acampamento
/
Hemoglobinas Glicadas
/
Automonitorização da Glicemia
/
Diabetes Mellitus Tipo 1
Tipo de estudo:
Observational_studies
/
Prognostic_studies
Limite:
Adolescent
/
Child
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Pediatr Diabetes
Assunto da revista:
ENDOCRINOLOGIA
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Polônia
País de publicação:
DENMARK
/
DINAMARCA
/
DK