Glycemic control with closed-loop intraperitoneal insulin in type I diabetes

Area of Science:

• Endocrinology
• Metabolic Diseases
• Biomedical Engineering

Background:

• Type I diabetes management often involves insulin therapy.
• Closed-loop insulin systems aim to mimic physiological insulin secretion.
• Comparing different insulin delivery routes is crucial for optimizing glycemic control.

Purpose of the Study:

• To compare the efficacy of intraperitoneal (i.p.) versus intravenous (i.v.) insulin infusion in closed-loop systems for type I diabetes.
• To evaluate the impact of insulin delivery route on postprandial glucose control and insulin pharmacokinetics.

Main Methods:

• A randomized, cross-over study involving eight type I diabetic subjects.
• Closed-loop insulin infusions were administered via i.p. and i.v. routes.
• Blood glucose and plasma insulin levels were monitored after a test meal.

Main Results:

• Plasma glucose peaks were significantly higher with i.p. compared to i.v. infusion (174 vs. 129 mg/dl).
• Hypoglycemia occurred in five of eight subjects at 180 minutes with i.p. infusion.
• A 60-minute lag in insulin rise was observed with i.p. administration, despite higher insulin doses.

Conclusions:

• Current closed-loop systems using i.p. insulin infusion do not offer superior glucose control over i.v. infusion.
• The delayed insulin absorption via i.p. route hinders effective glycemic management and can lead to hypoglycemia.
• Further research is needed to adjust artificial pancreas algorithms and explore bolus dosing strategies for i.p. delivery.