Effectiveness and Safety of the Intermittently Scanned Continuous Glucose Monitoring System FreeStyle Libre 2 in Patients with Type 2 Diabetes Treated with Basal Insulin or Oral Antidiabetic Drugs: An Observational, Retrospective Real-World Study

An overview of the FreeStyle Libre monitoring system for individuals with type 1 and type 2 diabetes

INTRODUCTION

Diabetes is a chronic disease with high prevalence, necessitating advanced technology to achieve glycemic targets and reduce complications. Continuous glucose monitoring (CGM) has become a cornerstone in diabetes management, with the Freestyle Libre (FSL) systems being some of the most widely used devices.

AREAS COVERED

This review focuses on FSL systems, each including an all-in-one sensor and transmitter, a handheld reader and a Mobile Medical App (MMA). Glucose data are uploaded to a dedicated cloud-based platform for analysis. Over the years, FSL has evolved with new features offering valuable support for individuals with diabetes, caregivers, and healthcare providers. Clinical trials and real-world studies have demonstrated efficacy and safety across diverse populations, including individuals with type 1 and type 2 diabetes, adolescents, and pregnant women with diabetes.

EXPERT OPINION

FSL is a user-friendly system that meets the needs of patients and healthcare providers. The MMA allows a review of glucose metrics and pattern identification, and supports educational strategies and patient-tailored treatment. Future advancements, including ketone monitoring, integration with wearables and other devices, and telemedicine applications, will further optimize diabetes care and prevention.

FRONTIER: FReeStyle Libre system use in Ontario among people with diabetes in the IC/ES database-Evidence from real-world practice: Patients on basal insulin, glucagon-like peptide 1 receptor agonist or oral therapies

AIM

We aimed to investigate glycated haemoglobin (HbA1c) levels and healthcare resource utilization (HCRU; emergency department [ED] visits or hospitalization) before and after adoption of FreeStyle Libre sensor-based glucose monitoring systems (FSL) by people with type 2 diabetes mellitus (T2DM) on basal insulin without glucagon-like peptide 1 receptor agonist (GLP-1 RA) therapy, basal insulin with GLP-1 RA therapy, GLP-1 RA therapy without insulin or oral therapy alone.

MATERIALS AND METHODS

Routinely collected administrative health data (housed at IC/ES, formerly the Institute for Clinical Evaluative Sciences) in Ontario, Canada were used to identify 20 253 people with T2DM who had a first FSL claim between 16 September 2019 and 31 August 2020 (index date) and remained active on FSL for 24 months' follow-up. HCRU was measured for 12 months before the index date and the last 12 months of the 24-month follow-up period. HbA1c data were taken from the latest tests in each period.

RESULTS

Mean HbA1c was statistically significantly reduced after FSL acquisition among people aged ≤65 or >65 years in all four treatment groups (range, 0.3-0.8% reduction). After FSL acquisition, ED visits and hospitalization were statistically significantly reduced in the oral therapy only group and in some basal insulin subgroups (without GLP-1 RA, all except hospitalization aged ≤65 years; with GLP-1 RA, only ED visits aged ≤65 years).

CONCLUSIONS

Among people with T2DM using basal insulin and/or non-insulin therapies, HbA1c levels were statistically significantly improved and HCRU was reduced after initiation of FSL.

Addition of continuous glucose monitoring to glucagon-like peptide 1 receptor agonist treatment for type 2 diabetes mellitus - An economic evaluation

BACKGROUND

Both glucagon-like peptide 1 receptor agonists (GLP-1 RAs) and continuous glucose monitoring (CGM) have been shown to improve glycated hemoglobin A1c (A1c) levels among patients with type 2 diabetes mellitus (T2DM). Recently, a US real-world study found statistically significant improvements in A1c levels among patients using GLP-1 RA and a CGM device, compared with a matched cohort receiving only GLP-1 RA.

OBJECTIVES

To assess the cost-effectiveness from a US payer perspective of initiating CGM (FreeStyle Libre Systems) in people living with T2DM using a GLP-1 RA therapy, compared with GLP-1 RA alone.

METHODS

A patient-level microsimulation model was run for 10,000 patients over a lifetime horizon with 3.0% discounting for costs and utilities. Patient characteristics were based on the overall population of the US real-world study and the subgroup of patients not using intensive insulin. The effect of CGM was modeled as a persistent reduction in A1c compared with GLP-1 RA alone (overall = 0.37%; patients not using intensive insulin = 0.34%). Costs ($2,023) and disutilities were applied to diabetes complications and acute diabetic events. Outcomes were assessed as quality-adjusted life years (QALYs).

RESULTS

The base-case incremental cost-effectiveness ratio (incremental costs/incremental QALYs) for GLP-1 RA plus CGM vs GLP-1 RA alone was $40,968/QALY in the overall cohort (cost = $484,180 vs $473,938; QALYs = 13.37 vs 13.12). Among patients not using intensive insulin, the incremental cost-effectiveness ratio was $43,095/QALY. Scenario analysis showed that the model results were robust to changing assumptions. Probabilistic sensitivity analysis showed that GLP-1 RA plus CGM had a 64% probability of being cost-effective at a willingness-to-pay threshold of $100,000 per QALY.

CONCLUSIONS

From a US payer perspective, CGM is cost-effective when added to GLP-1 RA therapies for the treatment of T2DM, including for patients not using intensive insulin.

Glucometric parameter changes in patients with type 2 diabetes during ramadan fasting: A prospective comparative real-world study

Background

This study assessed glucometric changes in Type 2 diabetes mellitus (T2DM) patients before, during, and after Ramadan fasting using an intermittently scanned continuous glucose monitoring system (isCGMS).

Methods

This prospective comparative study included T2DM patients aged 30-70 years who were receiving nonintensive insulin in Riyadh, Saudi Arabia. In addition to the baseline characteristics, glycated hemoglobin (HbA1c) and ambulatory glucose profile (AGP)-derived metric data were collected at three specific points: pre-, during-, and post-Ramadan. Self-care activities during Ramadan were evaluated using the Diabetes Self-Management Questionnaire (DSMQ).

Results

Overall, a total of 93 T2DM patients were enrolled in the study. Their mean age ±SD age was 47.9 ± 7.5 years, and 51.6 % of them were males. Compared with pre- and post-Ramadan, there was a significant decrease in HbA1c (p < 0.001 for both periods), average glucose level (p = 0.001 and p = 0.026, respectively), glucose variability (p = 0.043 and p = 0.005, respectively), and % time above the range of 181-250 mg/dL (p < 0.001 for both periods), as well as a significant increase in % time in target (70-180 mg/dL) during Ramadan (p < 0.001 for both periods). However, the % time below 54 mg/dL was slightly greater during Ramadan than both pre- and post-Ramadan (p < 0.001 and p = 0.002, respectively). Furthermore, 32.3 % reported inadequate self-care behaviors during Ramadan.

Conclusions

Ramadan fasting could improve glucose levels in T2DM patients who were not on intensive insulin, with a relatively low incidence of hypoglycemia.

Cost-utility analysis of a flash continuous glucose monitoring system in the management of people with type 2 diabetes mellitus on basal insulin therapy-An Italian healthcare system perspective

AIMS

To assess the cost-utility of the FreeStyle Libre flash continuous glucose monitoring (CGM) system from an Italian healthcare system perspective, when compared with self-monitoring of blood glucose (SMBG) in people living with type 2 diabetes mellitus (T2DM) receiving basal insulin.

MATERIALS AND METHODS

A patient-level microsimulation model was run using Microsoft Excel for 10 000 patients over a lifetime horizon, with 3.0% discounting for costs and utilities. Inputs were based on clinical trials and real-world evidence, with patient characteristics reflecting Italian population data. The effect of flash CGM was modelled as a persistent 0.8% reduction in glycated haemoglobin versus SMBG. Costs (€ 2023) and disutilities were applied to glucose monitoring, diabetes complications, severe hypoglycaemia, and diabetic ketoacidosis. The health outcome was measured as quality-adjusted life-years (QALYs).

RESULTS

Direct costs were €5338 higher with flash CGM than with SMBG. Flash CGM was associated with 0.51 more QALYs than SMBG, giving an incremental cost-effectiveness ratio (ICER) of €10 556/QALY. Scenario analysis ICERs ranged from €3825/QALY to €26 737/QALY. In probabilistic analysis, flash CGM was 100% likely to be cost effective at willingness-to-pay thresholds > €20 000/QALY.

CONCLUSIONS

From an Italian healthcare system perspective, flash CGM is cost effective compared with SMBG for people living with T2DM on basal insulin.

Association of Changes in A1C Following Continuous Glucose Monitoring Acquisition in People with Sub-Optimally Treated Type 2 Diabetes Taking GLP-1 RA Therapy

INTRODUCTION

Both glucagon-like peptide-1 receptor agonists (GLP-1 RA) and continuous glucose monitoring (CGM) improve glycemia in patients with type 2 diabetes (T2D). However, it is unknown whether adding CGM to GLP-1 RA therapy further improves A1c. We evaluated changes in A1c levels 6 months after initiation of FreeStyle Libre (FSL) in adults with sub-optimally controlled T2D already on GLP-1 RA therapy.

METHODS

This retrospective, observational study used Optum's de-identified Market Clarity Data, a linked electronic health record-claims database to assess changes in A1c after FSL acquisition. Inclusion criteria were T2D diagnosis, ≥ 18 years, baseline A1c ≥ 8%, with the first FSL acquisition between 2018 and 2022. Patients were required to be on GLP-1 RA prior to FSL with at least one GLP-1 RA prescription within 90 days of FSL acquisition. GLP-1 RA initiation was defined as the earliest GLP-1 RA prescription from 2017 onwards. Paired changes in A1c were assessed at 6 months after initial FSL acquisition.

RESULTS

The study cohort included 1454 adults with T2D (age 55 ± 10 years, 52% male, 38% with intensive insulin therapy, median 471 days from GLP-1 RA initiation to FSL, and baseline A1c 9.8 ± 1.5%). After FSL acquisition, patients experienced an A1c decrease of 1.5 ± 1.9% (p < 0.001). Patients with a baseline A1c > 10% had the largest reduction (n = 497, - 2.7 ± 2.2%, p < 0.001). Significant improvements were observed in subgroups based on insulin therapy and GLP-1 RA formulation. Those initiating GLP-1 RA therapy > 24 months before FSL acquisition also showed improvements in A1c (n = 478; - 1.3 ± 1.7%, p < 0.001).

CONCLUSIONS

In a large, real-world study of adults with T2D, those on prior GLP-1 RA therapy experienced significant A1c improvements after acquiring FSL, irrespective of GLP-1 RA duration, GLP-1 RA formulation, or insulin therapy type. These findings support the use of FSL in adults with T2D treated with GLP-1 RA.

Blood glucose monitoring devices for type 1 diabetes: a journey from the food and drug administration approval to market availability

Blood glucose monitoring constitutes a pivotal element in the clinical management of Type 1 diabetes (T1D), a globally escalating metabolic disorder. Continuous glucose monitoring (CGM) devices have demonstrated efficacy in optimizing glycemic control, mitigating adverse health outcomes, and augmenting the overall quality of life for individuals afflicted with T1D. Recent progress in the field encompasses the refinement of electrochemical sensors, which enhances the effectiveness of blood glucose monitoring. This progress empowers patients to assume greater control over their health, alleviating the burdens associated with their condition, and contributing to the overall alleviation of the healthcare system. The introduction of novel medical devices, whether derived from existing prototypes or originating as innovative creations, necessitates adherence to a rigorous approval process regulated by the Food and Drug Administration (FDA). Diverse device classifications, stratified by their associated risks, dictate distinct approval pathways, each characterized by varying timelines. This review underscores recent advancements in blood glucose monitoring devices primarily based on electrochemical sensors and elucidates their regulatory journey towards FDA approval. The advent of innovative, non-invasive blood glucose monitoring devices holds promise for maintaining stringent glycemic control, thereby preventing T1D-associated comorbidities, and extending the life expectancy of affected individuals.