Mina Hanna

New European medical device regulations require the performance of postmarketing surveillance evaluations for blood glucose meters (BGMs). We conducted an ISO15197:2015-conform system performance evaluation with the approved glucose dehydrogenase (GDH)-based Wellion NEWTON BGM. One hundred subjects were enrolled into the study (44 female, 56 male, 43 healthy subjects, 23 type 1 diabetes, 34 type 2 diabetes, age: 53.7 ± 15.8 years). In addition, manipulated heparinized whole blood was used for a laboratory interference test with ten selected substances (interference definition: substance-induced bias > 10%). The mean absolute relative difference (MARD) was 4.7%, and 100% of the values were in zones A (99.7%) and B (0.3%), respectively, of the consensus error grid. Interference was observed with xylose only, which is a known interfering substance for GDH-based BGMs.

Type 2 diabetes is a chronic progressive disease with increasing drug demands. It is comprised of a hereditary ß-cell dysfunction, (ßCD), insulin resistance (IR), and chronic systemic inflammation (CSI), which can be present with different degrees of severity. We have tested an alternative approach to the common drug escalation programs. DET (De-Escalation Treatment), temporary, multi-drug intervention targets to improve ß-Cell function and reverse disease progression. A personalized drug combination for a three-month treatment is determined based on a biomarker panel consisting of classic and new biomarkers. 22 patients (8 women, 14 men, age: 62±8 yrs., disease duration: 12±7 yrs., HbA1c: 7.8 %, BMI: 33.2±2.4 kg/m², treatment with 1 or 2 oral drugs) were treated with follow-up periods of up to 12 years. DET consisted of low doses each of basal insulin to address ßCD, treatment of IR (exercise and/or pioglitazone), a drug to reduce CSI (diet, GLP-1, or SGLTII) and a hypoglycemic intervention (metformin, or DPP-IV). The DET approach was well tolerated (nausea: 4 cases, edema: 1 case). All patients experienced a normalization or pronounced improvement of glycemic control without report of hypoglycemia. Mean HbA1c after 3 months was 5.9±0.4 %. Intact proinsulin decreased from 9.3±2.1 pmol/L to 2.3±0.6 pmol/L, adiponectin improved from 3.4±1.2 to 8.6±2.4 mg/dL, and mean body weight decreased by 2.4±1.1 kg (all: p11 years). Regeneration of ß-cell function by means of DET resulted in a temporary stop of chronic disease progression. A formal prospective clinical study to investigate the practicability of this approach in routine clinical practice is currently ongoing. Disclosure: A. Pfützner: Consultant; Self; LifeCare, Inc., Novo Nordisk A/S. Research Support; Self; CNOGA Medical, Esperion Therapeutics, Inc. Speaker’s Bureau; Self; Sanofi-Aventis. A. Manessis: Research Support; Self; Novo Nordisk Inc., Sciema GmbH. L. Do: Research Support; Self; Sciema GmbH. M. Hanna: None. Funding: Diabetes Treatment Centers International

Background: We evaluated the Wellion Galileo GLU/KET blood and ketone (ß-Hydroxybutyrate, ß-OHB) meter to demonstrate that it meets ISO15107:2015 regulatory approval criteria. Research Design and Methods: A total of 100 subjects (52 female, age: 30 to 84 years, diabetes: 10 type 1/90 type 2) with blood glucose levels distributed over the entire measurement range as required by the ISO15197 protocol were tested (double determinations with 3 strip lots and two devices). A similar test protocol was followed to test ß-OHB strip performance (reference devices: YSI 2300plus for glucose and STANBIO ß-HOB LiquiColor TestKit for ß-OHB). Precision was tested for glucose with 3 blood glucose concentrations (ß-OHB: 2 control solutions). Results: All glucose test-strip lots met the strict ISO acceptance criteria. Mean absolute relative difference (MARD) was 4.9% and all data pairs were in zone A of the consensus error grid. The ß-OHB test-strips also met the pre-defined acceptance criteria. Within-run and between-run precision was calculated to be 2.3% and 0.7% for the glucose strips (3.7%/0.8% for the ketone strips). Conclusions: When tested according to the ISO15197:2015 guideline, the device showed very accurate measurement performance for glucose and ß-OHB testing and fully met regulatory accuracy approval criteria.

Background: In recent randomized clinical trials, an unusual reporting pattern of glycemic data and hypoglycemic events potentially related to an internet enabled blood glucose meter (MyGlucoHealth, BGM) was observed. Therefore, this clinical study was conducted to evaluate the system accuracy of the BGM in accordance with the ISO15197:2015 guidelines with additional data collection. Methods: To investigate system accuracy, 10 of 3088 devices and 6 of 23 strip lots, used in the trials, were selected by a randomization procedure and a standard repeatability assessment. YSI 2300 STAT Plus was used as the standard reference method. The samples were distributed as per the ISO15197:2015 recommendations with 20 additional samples in the hypoglycemic range. Each sample was tested with 6 devices and 6 strip lots with double determinations. Results: Overall, 121 subjects with blood glucose values 26-423 mg/dL were analyzed, resulting in 1452 data points. In all, 186/1452 readings (12.8%) did not meet the ISO acceptance criteria. Data evaluated according to the FDA guidelines showed that 336/1452 (23.1%) readings did not meet the acceptance criteria. A clear bias toward elevated values was observed for BG <100 mg/dL (MARD: 11.0%). Conclusions: The results show that the BGM, although approved according to standard regulatory guidelines, did not meet the level of analytical accuracy required for clinical treatment decisions according to ISO 15197:2015 and FDA requirements. In general, caution should be exercised before selection of BGMs for patients and in clinical trials.