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A randomised, controlled trial of self-monitoring of blood glucose in patients with type 2 diabetes receiving conventional insulin treatment

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Abstract

Aims/hypothesis

We evaluated whether self-monitoring of blood glucose (SMBG) leads to better glycaemic control (HbA1c) in patients with type 2 diabetes on conventional insulin regimens.

Methods

Patients with type 2 diabetes on a conventional insulin regimen (basal or premixed insulin with or without additional oral glucose-lowering agents) were recruited at study centres led by members of the German Diabetes Association. In a randomised, prospective, open 2 × 2 factorial design, the once-weekly performance of four-point glucose profiles (SMBG +; n = 151 patients) was compared with no SMBG (SMBG −; n = 149), and the measuring and transmitting of HbA1c results to the study centres (HbA1c +; n = 158, of these 82 SMBG − and 76 SMBG +) was compared with HbA1c measurement without disclosure of results (HbA1c −; n = 142, of these 67 SMBG − and 75 SMBG +). Randomised allocation was carried out by a central office, using sequentially numbered, sealed envelopes. The primary endpoint was the reduction of HbA1c compared with baseline after 12 months. Secondary analyses were of therapy intensification in response to higher blood or urinary glucose or HbA1c. Participants and caregivers were not blinded as to the allocation of interventions, whereas the laboratory determining HbA1c remained blinded.

Results

Patient characteristics were balanced across groups. A total of 56 patients dropped out. In completers, HbA1c was reduced in the SMBG + group from 7.3% to 7.0%, i.e. by 0.3% (0.1%, 0.5%) vs SMBG − from 7.3% to 7.0% and 0.3% (0.2%, 0.5%), respectively, the difference being 0.0% (−0.2%, 0.2%) (p = 0.93). The disclosure of HbA1c results had no significant influence, with a difference of 0.1% (−0.1%, 0.4%) (p = 0.28). Values above are mean (95% CI). The ORs for therapy intensification significantly rose as the following increased: proportions of urine samples testing positive for glucose, HbA1c concentrations, and fasting or postprandial glucose concentrations. No important adverse events were associated with the interventions.

Conclusions/interpretation

SMBG profiles once weekly or the disclosure of HbA1c results did not improve glycaemic control in patients with type 2 diabetes on conventional insulin treatment, although indicators of hyperglycaemia increased the likelihood of therapy intensification. Greater intensification may be necessary to impact on glycaemic control.

Trial registration:

www.clinicaltrials.gov (registration code NCT00688363)

Funding:

Deutsche Diabetes-Gesellschaft, Deutsche Diabetes-Stiftung, Bayer Vital GmbH

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Abbreviations

LOCF:

Last observation carried forward

SMBG:

Self-monitoring of blood glucose

SMUG:

Self-monitoring of urinary glucose

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Acknowledgements

The study physician M. Gutzeit and the study nurse S. Ciossek, both Diabeteszentrum Bad Lauterberg, Bad Lauterberg im Harz, Germany, helped compile and analyse data. We also want to thank the study teams from the sites listed in the Appendix.

Funding

We are indebted to the Deutsche Diabetes-Gesellschaft for supporting this study and for providing logistic assistance through the Clinical Trials Study Group (Kommission Klinische Studien der DDG). We also thank Bayer Vital, Diabetes Care, Cologne, Germany and the Deutsche Diabetes-Stiftung, Munich, Germany for additional funding. The funders had no influence on the study protocol, data analysis, or the presentation and interpretation of results, which were entirely the responsibility of the study group represented by the authors.

Duality of interest

MiAN has received research grants (to his institution, the Diabeteszentrum Bad Lauterberg) from: AstraZeneca; Bayer Vital; Berlin-Chemie/Menarini; Bionime; Boehringer Ingelheim; Eli Lilly; Merck; Sharp & Dohme MetaCure; Novartis Pharma; Novo Nordisk Pharma; Roche Pharma; and Tolerx. He has also received consulting fees and/or honoraria for membership of advisory boards and for speaking from Amylin Pharmaceuticals, AstraZeneca, Berlin-Chemie/Menarini, Boehringer Ingelheim, Bristol–Myers Squibb, Diartis Pharmaceuticals, Eli Lilly, F. Hoffmann-LaRoche, GlaxoSmithKline, Intarcia Therapeutics Lifescan, MannKind Corporation, Merck Sharp & Dohme, Novartis Pharma, NovoNordisk, Sanofi-Aventis Pharma, Takeda, Versartis and Wyeth Research. These fees/honoraria included reimbursement for travel expenses in connection with the above-mentioned activities. MiAN owns no stock and is employed by Diabeteszentrum Bad Lauterberg, Germany.

BH has no duality of interest in relation to this manuscript.

CT is employed by the Ostfalia University of Applied Sciences. He has received consulting fees and/or honoraria for speaking from AstraZeneca, Novo Nordisk Pharma, German sickness funds and the National Association of Statutory Health Insurance Physicians (KBV).

UAM received a research grant from Roche Diagnostics, Germany and institutional education grants from Novo Nordisk and Merck Sharp & Dohme.

MaAN has received research grants (to his institution, Universitätsmedizin Greifswald) from Becton Dickinson, Bio-Rad, Radiometer, Roche and Siemens Healthcare Diagnostics. He has received consulting fees and/or honoraria for membership of advisory boards and for speaking from Becton Dickinson, Bio-Rad, Roche and Siemens Healthcare Diagnostics. These fees/honoraria included reimbursement for travel expenses in connection with the above-mentioned activities. Matthias AN owns no stock and is employed by Universitätsmedizin Greifswald, Germany.

LH, in his position as CEO of Profil when this study was performed, has received grants from a number of companies for performing clinical trials related to SMBG and continuous glucose monitoring. He has also received honoraria from many of these companies for consultancy and speaking activities.

Contribution statement

MiAN, BH, CT, MaAN and LH served on the Steering Committee designing, performing and analysing the study. They wrote the manuscript and collectively decided to publish the manuscript. BH performed the statistical analysis. UAM contributed to the analysis and interpretation of the data. All authors participated in the drafting of the article or revising it critically for important intellectual content, and have given final approval of the version to be submitted for publication.

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Correspondence to Michael A. Nauck.

Additional information

Additional members of the Clinical Trials Study Group are listed in the Appendix.

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Appendix

Appendix

In addition to the persons listed as authors, the following are also members of the Clinical Trials Study Group of the German Diabetes Association: P. Sawicki, Cologne; B. Böhm, Ulm; E. Rehring, Bad Lauterberg im Harz; H.-G. Ley, Marl; B. Gallwitz, Tübingen; S. Lange, Cologne; A. Tytko, Bad Lauterberg; R. Lundershausen, Erfurt; S. Martin, Düsseldorf; M. Gutzeit, Bad Lauterberg; Ch. von Boxberg, Leverkusen; M. Füchtenbusch, Munich. We acknowledge the following individuals for taking care of the patients studied at the associated study centres: R. Naumann, Schöppenstedt; R. Bellmann, Berlin; M. Jäger, Höchst (Breuberg/Odenwald); M. Gutzeit and A. Hinz, Bad Lauterberg; A. Eidner, Jena; A. Kamke and R. Radke, Burg/Spreewald; Z. Kourbanova, Langenfeld; U. Weller, Dorsten; M. Füchtenbusch, Munich; A. Schmidt-Reinwald, Waldrach; S. Maxeiner, Bosenheim; A. Hendel, Grassau; R. Böhme, Nordhausen; Th. Behnke, Neuwied; P. Krege, Emsdetten; U. Schmitz, Krefeld; A.-W. Bödecker, Wiehl; A. Rieth-Kunert, Stade; Stefan Fels, Oldenburg; W. Neumann, Selters/Westerwald; G. Willms, Leverkusen; H.-G. Ley, Marl; C. Jödicke, Bad Lauterberg; P. Koch, Bad Harzburg; Ch. Mulch-Wiemer, Bad Nauheim; M. Pfeiffer, Gronau; F. Fueting, Nassau; V. J. Jung, Waldkraiburg; J. Grossmann, Mönchengladbach; R. Hildebrandt, Clausthal-Zellerfeld; E.-M. Oerter, Würzburg; U. Preuß, Datteln; M. Friedrichs, Bad Lauterberg; M. Leupold, Borna; S. Gölz, Esslingen; H. Fischer, Düren; U. Warmers, Bitburg; D. Schoch, Berlin; K. Nowack, Torgau; J. Lemmerhirt, Cuxhaven; F. Klein, Schenklengsfeld; I. Niemetz, Kassel; K. Wollersen, Freiburg. All centres listed are in Germany.

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Nauck, M.A., Haastert, B., Trautner, C. et al. A randomised, controlled trial of self-monitoring of blood glucose in patients with type 2 diabetes receiving conventional insulin treatment. Diabetologia 57, 868–877 (2014). https://doi.org/10.1007/s00125-014-3168-1

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