Automated Insulin Delivery Amongst Pregnant Women With Type 1 Diabetes

An open-label, multi-centre, randomized, two-arm parallel group trial comparing automated closed-loop and standard insulin delivery.

124 pregnant women between 18 and 45 years of age with Type 1 Diabetes of at least 12 months' duration on standard insulin delivery (CSII or MDI) will be recruited through outpatient antenatal diabetes clinics. Women fulfilling the eligibility criteria will be randomized to automated insulin delivery (AiD) or to continue standard patient-directed insulin delivery (CSII or MDI) without AiD. The study will take place within the home and NHS antenatal clinical settings.

Additional blood samples for the research will be obtained at the 24th and 34th week of pregnancy and questionnaires will also be completed by the participant at the 34th week of pregnancy. Following this we will collect information on the birth.

25 of the woman randomised to the closed loop insulin delivery system will also be interviewed to gain more information on, among other things, their existing diabetes management practices, everyday work and family lives and their experience with the device.

Inclusion criteria

• Between 18 and 45 years of age (inclusive).
• A diagnosis of type 1 diabetes (T1D), as defined by WHO for at least 12 months.
• A viable pregnancy confirmed by ultrasound, up to 13 weeks and 6 days gestation.
• Currently on intensive insulin therapy (≥3 injections or CSII).
• Willingness to use the study devices throughout the trial.
• HbA1c level ≥48 mmol/mol (≥6.5%) at booking (first antenatal contact) and ≤86 mmol/mol (≤10%) at point of randomization.
• Able to provide informed consent.
• Have access to email.

Exclusion criteria

• Non-type 1 diabetes.
• Any other physical or psychological disease which, in the opinion of the investigator, is likely to interfere with the normal conduct and interpretation of the study results e.g. untreated coeliac disease or untreated hypothyroidism.
• Current treatment with drugs known to interfere with glucose metabolism as judged by the investigator such as high dose systemic corticosteroids, non-selective beta-blockers and MAO inhibitors.
• Known or suspected allergy against insulin.
• Women with advanced nephropathy (eGFR <45), severe autonomic neuropathy, uncontrolled gastroparesis or severe proliferative retinopathy, as judged by the investigator, that is likely to interfere with the normal conduct of the study and interpretation of study results.
• Very good or very poor glycaemic control i.e. first antenatal HbA1c <48 mmol/mol (<6.5%) and current HbA1c >10% (>86 mmol/mol). Women who enter pregnancy with HbA1c >10% (>86 mmol/mol) may participate if they achieve HbA1c ≤10% (≤86 mmol/mol) before randomization.
• Total daily insulin dose 1.5 IU/kg.
• Severe visual or hearing impairment.
• Unable to speak and understand English.