OBJECTIVE -To investigate the pharmacodynamic profile and duration of action for five subcutaneous doses of insulin detemir (0.1, 0.2, 0.4, 0.8, and 1.6 units/kg; 1 unit ϭ 24 nmol) and one subcutaneous dose of NPH insulin (0.3 IU/kg; 1 IU ϭ 6 nmol).
RESEARCH DESIGN AND METHODS-This single-center, randomized, doubleblind, six-period, crossover study was carried out as a 24-h isoglycemic clamp (7.2 mmol/l) in 12 type 1 diabetic patients.RESULTS -Duration of action for insulin detemir was dose dependent and varied from 5.7, to 12.1, to 19.9, to 22.7, to 23.2 h for 0.1, 0.2, 0.4, 0.8, and 1.6 units/kg, respectively. Interpolation of the dose-response relationships for AUC GIR (area under the glucose infusion rate curve) revealed that a detemir dose of 0.29 units/kg would provide the same effect as 0.3 IU/kg NPH but has a longer duration of action (16.9 vs. 12.7 h, respectively). Lower between-subject variability was observed for insulin detemir on duration of action (0.4 units/kg insulin detemir vs. 0.3 IU/kg NPH, P Ͻ 0.05) and GIR max (maximal glucose infusion rate) (0.2 and 0.4 units/kg insulin detemir vs. 0.3 IU/kg NPH, both P Ͻ 0.05). Assessment of endogenous glucose production (EGP) and peripheral glucose uptake (PGU) resulted in an AOC EGP (area over the EGP curve) of 636 mg/kg (95% CI 279 -879) vs. 584 (323-846) and an AUC PGU (area under the PGU curve) of 173 (47-316) vs. 328 (39 -617) for 0.29 units/kg detemir vs. 0.3 IU/kg NPH, respectively.CONCLUSIONS -This study shows that insulin detemir provides a flat and protracted pharmacodynamic profile.
Diabetes Care 28:1107-1112, 2005T raditional basal insulin formulations such as NPH or zinc insulin have limitations such as variability in insulin absorption after subcutaneous injection, resulting in an unpredictable action profile increasing the risk of hypoglycemic episodes, and a pharmacodynamic profile requiring several injections to cover 24 h (1-4).Recently, long-acting insulin analogs have been biologically engineered to overcome these limitations (5-9). These insulin analogs make use of different principles for achieving a protracted insulin profile, such as changing the isoelectric point (insulin glargine) or acylation of the insulin molecule (insulin detemir). Previous studies have confirmed both a delayed and a sustained blood glucoselowering effect with insulin detemir compared with NPH insulin in healthy subjects (10,11). However, the results show that a higher molar dose of insulin detemir is needed to achieve comparable glycemic control similar to that observed with NPH insulin (10).The objective of the present trial was to describe the 24-h pharmacodynamic profile, including duration of action and dose-response relationship, of insulin detemir in subjects with type 1 diabetes and to compare this with NPH insulin.
RESEARCH DESIGN ANDMETHODS -In this single-center, double-blind, six-period, randomized, dose-response trial, isoglycemic (7.2 mmol/l) subjects were randomized to a specific treatment sequence encompassing five dose levels of insulin dete...