Progressive Acceleration of Insulin Exposure Over 7 Days of Infusion Set Wear.

Insulin exposure varies over 3 days of insulin infusion set (IIS) wear making day-to-day insulin dosing challenging for people with diabetes (PWD). Here we report insulin pharmacodynamic (PD) and pharmacokinetic (PK) data extending these observations to 7 days of IIS wear. PWD (A1C ≤8.5%, C-peptide <0.6 nmol/L, ≥6 months pump use) were enrolled in a crossover euglycemic clamp pilot study comparing conventional Teflon angled IISs with an investigational extended-wear IIS. PK/PD data from six participants were obtained for 5 h postbolus. Although PD data were unstable, PK profiles (pooled data from both groups) of insulin lispro (0.15 U/kg bolus) showed statistically significant progressive decreases from days 0 to 7 for tmax (P < 0.001), Cmax (P < 0.05), and mean residence time (P < 0.0001). Area under the insulin concentration curve (AUC0-300) declined by ∼24% from days 0 to 7 (P < 0.05). These results confirm/extend previous observations showing progressive acceleration of insulin exposure over IIS wear time. This may have implications for PWD and designers of closed-loop algorithms, although larger studies are necessary to confirm this. The study was registered in clinicaltrials.gov (NCT04398030).

Feasibility study of a prototype extended-wear insulin infusion set in adults with type 1 diabetes.

AIM: To assess the feasibility of a prototype insulin infusion set (IIS) for extended wear in adults with type 1 diabetes. MATERIALS AND METHODS: The prototype Capillary Biomedical investigational extended-wear IIS (CBX IIS) incorporates a soft, flexible, reinforced kink-resistant angled nylon-derivative cannula with one distal and three proximal ports to optimize insulin delivery. Twenty adult participants with type 1 diabetes established on insulin pump therapy used the CBX IIS for two 7-day test periods while wearing a Dexcom G5 continuous glucose monitor. RESULTS: Participants were able to wear the CBX IIS for an average of 6.6 ± 1.4 days. Eighty-eight percent (36 of 41) of sets were worn for 7 days. No serious adverse events were reported. Five infusion sets failed prematurely because of: unresolvable hyperglycaemia (three); hyperglycaemia with elevated ketones (one); or infection (one). Median time in range (3.9-10.0 mmol/L) was 62% (54-76). Average glucose levels per day of infusion set wear showed a statistically significant increase over time (p < .001). CONCLUSIONS: Our preliminary observations confirm the tolerability of the prototype CBX IIS for extended wear, albeit with a deterioration in glucose control after the third day.

Effectiveness of V-Go® for Patients with Type 2 Diabetes in a Real-World Setting: A Prospective Observational Study.

BACKGROUND: V-Go is a wearable, patch-like, 24-h insulin delivery device that delivers both a continuous preset basal rate and on-demand bolus dosing. The aim of this study was to observe glycemic control, insulin dosing, and hypoglycemia risk in patients switched to V-Go in a real-world setting. The primary objective was to compare change in mean hemoglobin A1c (HbA1c) from baseline to the end of V-Go use. METHODS: This prospective, open-label, multicenter study recruited patients with type 2 diabetes (T2D) and suboptimal glycemic control (HbA1c ≥ 7%) across 28 centers. Efficacy analyses were conducted for all patients with a post-baseline HbA1c and results stratified based on prior antihyperglycemic medication therapies. Insulin dosing was at the discretion of the health care provider and the protocol did not mandate glycemic targets. Treatment satisfaction surveys were utilized to gain patient feedback on the use of V-Go. RESULTS: One hundred eighty-eight patients were enrolled in the study, among whom 140 patients had a valid post-baseline HbA1c and were included in the primary efficacy analysis. Use of V-Go resulted in a change of - 0.64%; (P = 0.003) in HbA1c from baseline, and in those prescribed insulin, the total daily dose of insulin was decreased by 12 units/day (P < 0.0001). Twenty-two patients (12%) reported hypoglycemic events (≤ 70 mg/dL), with an event rate of 1.51 events/patient/year. CONCLUSION: In a T2D population with suboptimal HbA1c, initiating V-Go therapy in a real-world setting significantly improved glycemic control and led to significant insulin dose reductions. ClinicalTrial.gov registry identifier: NCT01326598.

A Pragmatic Clinical Trial to Compare the Real-World Effectiveness of V-Go versus Standard Delivery of Insulin in Patients with Advanced Type 2 Diabetes.

BACKGROUND: Many patients with type 2 diabetes mellitus (T2DM) do not have adequate glycemic control, leading to poor patient outcomes and high healthcare costs. OBJECTIVE: This prospective pragmatic clinical trial evaluated V-Go, a wearable insulin delivery device, compared with standard treatment optimization (STO) among insulin-treated patients with T2DM in a real-world, community-based practice setting. METHODS: Study sites, rather than individual patients, were randomized to V-Go or STO via cluster randomization. Patients were treated according to routine clinical practice and followed up to 4 months. T2DM medications and supplies were purchased utilizing usual insurance and co-pay systems. The primary analysis was an unadjusted treatment group comparison of glycosylated hemoglobinA1c (HbA1c) change from baseline to end of study (EOS). A cost of therapy analysis was completed on patients who had received comparable baseline T2DM treatment with multiple daily basal-bolus insulin injections (MDI). RESULTS: Analysis included 415 patients (169 V-Go, 246 STO) enrolled from 52 US sites. Mean baseline HbA1c (9.6%) was higher in V-Go (9.9%, range 8.0% - 14.2%) than STO (9.3%, range 7.9% - 13.9%, p <.001). HbA1c decreased from baseline to EOS in both V-Go (-1.0%, p<.001) and STO (-0.5%, p<.001); V-Go had significantly larger decrease (p=.002). V-Go had a significant reduction (p<.001) in mean insulin total daily dose (TDD; 0.76 U/kg baseline, 0.57 U/kg EOS), not seen in STO (0.72 U/kg baseline and EOS). The MDI group included 95 (56.2%) V-Go and 113 STO (45.9%) patients. Mean baseline HbA1c was significantly higher in V-Go (9.9%) than STO (9.4%). V-Go also experienced larger decrease in HbA1c from baseline (-1.0%) than STO (-0.36%) (p=.006) with a decrease in TDD, while STO TDD remained unchanged. EOS mean per patient per day cost of diabetes treatment was lower for V-Go ($30.59) vs STO ($32.20) (p=.006). V-Go was more cost effective than STO ($24.02 per 1% drop in HbA1c vs $58.86, respectively). CONCLUSIONS: This pragmatic clinical trial demonstrated improved HbA1c levels, lower cost, and decreased insulin dose in patients with T2DM initiating V-Go vs STO in a real-world community-based practice setting. Observed baseline HbAlc indicated use of V-Go in more difficult to manage diabetes patients.

Effects of Dapagliflozin on 24-Hour Glycemic Control in Patients with Type 2 Diabetes: A Randomized Controlled Trial.

BACKGROUND: Glycated hemoglobin (HbA1c) and measures of short-term glycemia do not fully capture daily patterns in plasma glucose dynamics. This study evaluated 24-h glycemic profiles in patients with type 2 diabetes (T2D) initiated on dapagliflozin treatment using continuous glucose monitoring (CGM). METHODS: This randomized double-blind placebo-controlled multicenter parallel-design 4-week study compared dapagliflozin (10 mg/d; n = 50) with placebo (n = 50) in adult patients with T2D uncontrolled (HbA1c 7.5%-10.5%) on either stable doses of metformin monotherapy (≥1500 mg/d) or insulin (≥30 U/d with or without up to two oral antidiabetes drugs). CGM was used to measure 24-h glycemic profiles for 7 days pretreatment and during week 4 of treatment. The primary outcome was change from baseline in 24-h mean glucose (MG) at week 4. RESULTS: The 24-h MG decreased 18.2 mg/dL with dapagliflozin and increased 5.8 mg/dL with placebo (P < 0.001). The proportion of time spent in the target glucose range (70-180 mg/dL) increased significantly with dapagliflozin versus placebo (69.6% vs. 52.9%; P < 0.001), with a small (0.3%) increase in time spent in the hypoglycemic range (<70 mg/dL), driven by those on background insulin therapy. Dapagliflozin reduced postprandial glucose and significantly decreased overall glucose variability. Few events of symptomatic hypoglycemia occurred. The most common adverse event was urinary tract infection (6% in each treatment arm). CONCLUSIONS: Compared with placebo, dapagliflozin improved measures of glycemic control and variability as assessed by CGM. Glycemic improvements were more pronounced in the group on background metformin than those receiving basal insulin.

Comparative Pharmacokinetic/Pharmacodynamic Study of Liquid Stable Glucagon Versus Lyophilized Glucagon in Type 1 Diabetes Subjects.

BACKGROUND: There is currently no stable liquid form of glucagon commercially available. The aim of this study is to assess the speed of absorption and onset of action of G-Pump™ glucagon at 3 doses as compared to GlucaGen®, all delivered subcutaneously via an OmniPod®. METHODS: Nineteen adult subjects with type 1 diabetes participated in this Phase 2, randomized, double-blind, cross-over, pharmacokinetic/pharmacodynamic study. Subjects were given 0.3, 1.2, and 2.0 µg/kg each of G-Pump glucagon and GlucaGen via an OmniPod. RESULTS: G-Pump glucagon effectively increased blood glucose levels in a dose-dependent fashion with a glucose Cmax of 183, 200, and 210 mg/dL at doses of 0.3, 1.2, and 2.0 µg/kg, respectively (P = ns vs GlucaGen). Mean increases in blood glucose from baseline were 29.2, 52.9, and 77.7 mg/dL for G-Pump doses of 0.3, 1.2, and 2.0 µg/kg, respectively. There were no statistically significant differences between treatments in the glucose T50%-early or glucagon T50%-early with one exception. The glucagon T50%-early was greater following G-Pump treatment at the 2.0 µg/kg dose (13.9 ± 4.7 min) compared with GlucaGen treatment at the 2.0 µg/kg dose (11.0 ± 3.1 min, P = .018). There was more pain and erythema at the infusion site with G-Pump as compared to GlucaGen. No serious adverse events were reported, and no unexpected safety issues were observed. CONCLUSIONS: G-Pump glucagon is a novel, stable glucagon formulation with similar PK/PD properties as GlucaGen, but was associated with more pain and infusion site reactions as the dose increased, as compared to GlucaGen.

Enhanced absorption of Nasulin™, an ultrarapid-acting intranasal insulin formulation, using single nostril administration in normal subjects.

BACKGROUND: This pharmacokinetic (PK) study was designed to investigate the maximum intranasal insulin dose that could be achieved by repeated doses in a single nostril of a nasal spray of recombinant regular human insulin 1% in combination with cyclopentadecalactone (CPE-215) 2%, a compound that enhances absorption of molecules across mucous membranes (Nasulin™, CPEX Pharmaceuticals, Inc.). METHOD: A nine-period crossover study of 8 healthy, nonsmoking subjects (ages 18-50, body mass index <33 kg/m², weight >70 kg) were studied. In a fasted state, subjects were randomly given 25, 50, and 75 U in a single nostril on the first day and randomly given 50, 75, and 100 U doses utilizing both nostrils on two subsequent days. After a 45-minute PK assessment, subjects were given a meal. To determine the mechanism of enhanced absorption in a single nostril, a second study utilizing 24 subjects under similar conditions received 25 U, placebo (P) that included CPE-215 plus 25 U, and 50 U in a single nostril. RESULTS: Single nostril administration revealed enhanced absorption with maximum concentrations (C(max)) of 13, 65, and 96 µU/ml for the 25, 50, and 75 U doses, respectively. Dual nostril administration in two cohorts resulted in C(max) of 31/42, 65/52, and 88/79 µU/ml for the 50, 75, and 100 U, respectively. In the second cohort, C(max) was 23, 19, 56 µU/ml for the 25, P + 25, and 50 U doses, respectively. CONCLUSIONS: Repeated dosing in a single nostril resulted in enhanced absorption; this was not due to the increased CPE-215 but to the increased insulin administered.

Comparison pharmacokinetics of two concentrations (0.7% and 1.0%) of Nasulin, an ultra-rapid-acting intranasal insulin formulation.

BACKGROUND: This pharmacokinetic (PK) study was designed to characterize the dose response of two concentrations (0.7% and 1%) of a nasal spray of recombinant regular human insulin in combination with cyclopentadecalactone (CPE-215), a compound that enhances absorption of molecules across mucous membranes (Nasulin, CPEX Pharmaceuticals). Nasulin has been effective in lowering blood glucose in both normal subjects and diabetes patients, and additional dosing options would allow greater titration flexibility. METHOD: A five-period crossover study of 24 healthy, nonsmoking subjects (ages 18-50, basal metabolic index <33 kg/m(2), weight >70 kg) were studied. Subjects were in a fasted state for 5 h before and 45 min after administration for PK assessment and were then given a meal. Each spray contained 100 microl. Doses tested were 25, 35, 50, 70, and 100 U. Maximum concentration (C(max)) and area under the curve (AUC) were estimated for each dose group. Glucose measurements were also performed. RESULTS: A dose response (slope of the natural log response versus dose) was demonstrated by baseline-adjusted C(max) of 22, 27, 56, 62, and 84 microU/ml for the 25, 35, 50, 70, and 100 U doses (p < .0001), respectively, and by baseline-adjusted AUC((0-45 min)) values of 491, 592, 1231, 1310, and 1894 microU/ml/min (p < .0001). Glucose AUC((0-45 min)) determinations also demonstrated a pharmacodynamic (PD) dose response. CONCLUSIONS: Proportional and linear dose responses for both PK and PD parameters were demonstrated for the two concentrations, making multiple doses available for clinical development.