Clinical Effectiveness of Advanced Hybrid Closed-loop Systems for Achieving Time in Tight Range Among T1D Patients

Diabetes is a chronic disease with a relevant public health burden. Type 1 diabetes (T1D) is characterized by the autoimmune destruction of insulin-producing pancreatic beta cells, which requires the administration of exogenous insulin for its treatment. Maintaining blood glucose levels as close to normal as possible is essential to avoid the associated microvascular and macrovascular complications that affect quality of life, as well as morbidity and mortality due to the deleterious long-term effects of suboptimal control. Therefore, the key to prevent and/or reduce the development of these complications lies in adequate and strict glycemic control.

The use of advanced hybrid closed-loop (AHCL) systems in patients with T1D is associated with improved glycemic control and quality of life in both controlled clinical trials and real-life studies. Since 2021, AHCL systems are considered the standard of care, ahead of traditional MDI.

There are three main types of AHCL systems marketed in Spain: SmartGuard in Medtronic Minimed 780G (MM780G), Control-IQ in Tandem T Slim X2 (TTSX2) and CamAPS in Ypsopump (CamAPS).

All three systems have been shown indepently to significantly improve glycaemic control in people with DM1 as expressed by the classic control targets of the International Time in Range Consensus (percentage of interstitial glucose time in range 70-180 mg/dL >70%). So much so that it has been suggested to further intensify the possible glucose targets in patients treated with AHCL systems to a time in tight range (TITR) of interstitial glucose (70-140 mg/dL) >50%.

However, there is little information on the benefits and safety of using tighter control targets. Furthermore, there is no evidence about comparing the clinical benefit differences between these three types of technology.

The main objective is to analyze the effect on time in tight range (TiTR, 70-140 mg/dL) of interstitial glucose between three different advanced hybrid closed-loop (AHCL) systems among adult people with T1D.

This is multicenter (3 centers) cross-sectional observational clinical study (non-randomized). The target population will be adult T1D patients treated with any of the aforementioned AHCL systems followed in any of the three participant centers.

Inclusion criteria

• Patients with type 1 diabetes.
• Age greater than or equal to 18 years.
• Treated with advanced hybrid closed-loop systems (AHCL) for at least 3 months
• Actived continuous glucose monitoring data in the last 14 days.

Exclusion criteria

• Other types of diabetes.
• Receiving treatment with insulin regimens other than AHCL.
• Having received AHCL treatment for less than 3 months in a row prior to inclusion in the study with the same system.
• No data on use of the AHCL system during the previous 14 days.
• Severe or uncontrolled psychiatric disorder.
• Pregnancy or end of pregnancy less than 3 months ago or preparation for pregnancy.