Optimizing Insulin Therapy in Type 1 Diabetes

Introduction to Insulin Regimens

The American Diabetes Association recommends adding prandial insulin coverage with rapid-acting insulin analogs before meals, as basal insulin alone is insufficient for optimal glycemic control in type 1 diabetes 1, 2
Type 1 diabetes requires both basal and prandial insulin components to achieve glycemic targets, with the landmark DCCT demonstrating that intensive insulin therapy reduces A1C and microvascular complications 1, 3

The American Association of Clinical Endocrinologists suggests starting with 0.5 units/kg/day as total daily insulin dose for metabolically stable type 1 diabetes patients, divided 50% as basal insulin and 50% as prandial insulin split among three meals 1, 3
Higher doses (0.4-1.0 units/kg/day) may be needed during puberty, pregnancy, or illness 1, 3
Rapid-acting insulin analogs (lispro, aspart, or glulisine) should be used before each meal, with quicker onset and peak and shorter duration than regular human insulin 1, 2

The American Diabetes Association recommends educating patients to match prandial insulin dose to carbohydrate intake, premeal blood glucose, and anticipated activity, with a typical starting carbohydrate-to-insulin ratio of 1 unit per 10-15 grams of carbohydrate 1, 2, 4
The insulin sensitivity factor (ISF) can be calculated using 1500 ÷ Total Daily Dose, determining how much 1 unit of insulin will lower blood glucose 1

The Endocrine Society considers continuous glucose monitoring (CGM) standard of care for most people with type 1 diabetes, reducing nocturnal hypoglycemia and improving overall glycemic control 1
Insulin pump therapy (CSII) has modest advantages for lowering A1C and reducing severe hypoglycemia rates, and should be considered if multiple daily injections fail to achieve targets 1, 4

The American Association of Clinical Endocrinologists recommends daily self-monitoring of blood glucose before meals and snacks, occasionally postprandially, at bedtime, prior to exercise, and when suspecting low blood glucose, with A1C checks at least quarterly when therapy has changed or goals are not being met 1, 5
Patients should be educated on proper insulin injection technique and site rotation, recognition and treatment of hypoglycemia, carbohydrate counting skills, "sick day" management rules, and insulin storage and handling 1, 2, 4