Cited by 43Diabetes Management and ResearchDiabetes Management and EducationDiabetes Treatment and Management

Method for automatic adjustment of an insulin bolus calculator: In silico robustness evaluation under intra-day variability

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Herrero, Pau, Pesl, Peter, Bondia, Jorge, Reddy, Monika, Oliver, Nick, Georgiou, Pantelis, Toumazou, Christofer·2015·Computer Methods and Programs in Biomedicine

Abstract

Background and objective Insulin bolus calculators are simple decision support software tools incorporated in most commercially available insulin pumps and some capillary blood glucose meters. Although their clinical benefit has been demonstrated, their utilisation has not been widespread and their performance remains suboptimal, mainly because of their lack of flexibility and adaptability. One of the difficulties that people with diabetes, clinicians and carers face when using bolus calculators is having to set parameters and adjust them on a regular basis according to changes in insulin requirements. In this work, we propose a novel method that aims to automatically adjust the parameters of a bolus calculator. Periodic usage of a continuous glucose monitoring device is required for this purpose.Methods To test the proposed method, an in silico evaluation under real-life conditions was carried out using the FDA-accepted Type 1 diabetes mellitus (T1DM) UVa/Padova simulator. Since the T1DM simulator does not incorporate intra-subject variability and uncertainty, a set of modifications were introduced to emulate them. Ten adult and ten adolescent virtual subjects were assessed over a 3-month scenario with realistic meal variability. The glycaemic metrics: mean blood glucose; percentage time in target; percentage time in hypoglycaemia; risk index, low blood glucose index; and blood glucose standard deviation, were employed for evaluation purposes. A t-test statistical analysis was carried out to evaluate the benefit of the presented algorithm against a bolus calculator without automatic adjustment.Results The proposed method statistically improved (p<0.05) all glycemic metrics evaluating hypoglycaemia on both virtual cohorts: percentage time in hypoglycaemia (i.e. BG<70 mg/dl) (adults: 2.7±4.0 vs. 0.4±0.7, p=0.03; adolescents: 7.1±7.4 vs. 1.3±2.4, p=0.02) and low blood glucose index (LBGI) (adults: 1.1±1.3 vs. 0.3±0.2, p=0.002; adolescents: 2.0±2.19 vs. 0.7±1.4, p=0.05). A statistically significant improvement was also observed on the blood glucose standard deviation (BG SD mg/dL) (adults: 33.5±13.7 vs. 29.2±8.3, p=0.01; adolescents: 63.7±22.7 vs. 44.9±23.9, p=0.01). Apart from a small increase in mean blood glucose on the adult cohort (129.9±11.9 vs. 133.9±11.6, p=0.03), the rest of the evaluated metrics, despite showing an improvement trend, did not experience a statistically significant change.Conclusions A novel method for automatically adjusting the parameters of a bolus calculator has the potential to improve glycemic control in T1DM diabetes management.

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Crossref · 10.1016/j.cmpb.2015.02.003

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Authors
Herrero, P., Pesl, P., Bondia, J., Reddy, M., Oliver, N., Georgiou, P., & Toumazou, C.
Affiliations
  • Imperial College London (GB)
  • Imperial College Healthcare NHS Trust (GB)
Corresponding author
Herrero, Pau
Venue
Computer Methods and Programs in Biomedicine
Publisher
Elsevier BV
Published
2015-04
Volume
119
Issue
1
Pages
1-8
ISSN
0169-2607 (ISSN-L)
OpenAlex
W2083543575
Cited by
43
References
32
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 5 · 2021: 2 · 2020: 8 · 2019: 5 · 2018: 8 · 2017: 5 · 2016: 5 · 2015: 1
FWCI
5.51
Type
journal article
Language
en
Open access
Locations
  • Computer Methods and Programs in Biomedicine (publishedVersion)
  • PubMed (publishedVersion)
  • RiuNet (Universitat Politècnica de València) (submittedVersion, cc-by-nc-nd)
Funders
  • Wellcome Trust
  • National Institute for Health Research
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
auto-tuning, type 1 diabetes, continuous glucose monitoring, intraday variability, hypoglycemia, low blood glucose index, time in target, insulin pump, UVA/Padova simulator, in silico evaluation, adolescents, adults, glycemic control, decision support software
MeSH terms
Adolescent, Adult, Algorithms, Computer Simulation, Decision Support Techniques, Diabetes Mellitus, Type 1, Humans, Hypoglycemic Agents, Insulin, Insulin Infusion Systems, Software, User-Computer Interface, Blood Glucose Self-Monitoring, Computational Biology, Postprandial Period

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