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Challenges to hemoglobin A1c as a therapeutic target for type 2 diabetes mellitus

Masayuki Ikeda1, Rumiko Shimazawa2

  • 1Department of Medical Informatics Kagawa University Hospital Kagawa Japan.

Journal of General and Family Medicine
|July 18, 2019
PubMed

Insights

Individual differences in hemoglobin glycation may explain why lowering HbA1c doesn't always reduce risks for type 2 diabetes patients. Further research is needed to refine glycemic targets and improve drug therapies.

Area of Science:

  • Endocrinology
  • Metabolic Diseases
  • Clinical Pharmacology

Background:

  • Glycated hemoglobin (HbA1c) is a standard measure for long-term blood glucose control in type 2 diabetes (T2D).
  • Discrepancies exist among medical societies regarding optimal HbA1c targets for T2D management.
  • Concerns have arisen regarding cardiovascular risks associated with certain glucose-lowering drugs, even with significant HbA1c reduction.

Purpose of the Study:

  • To investigate the role of inter-individual variability in hemoglobin glycation in explaining inconsistencies in glycemic control outcomes.
  • To question the universal applicability of HbA1c as a sole therapeutic target in T2D.
  • To provide evidence supporting a re-evaluation of HbA1c's role in clinical trials and practice.

Main Methods:

  • Analysis of data from large cardiovascular outcome trials involving glucose-lowering drugs.
  • Examination of associations between drug efficacy, glycemic control (HbA1c levels), and adverse events (heart failure, amputation).
  • Hypothesizing the impact of individual hemoglobin glycation differences on observed outcomes.

Main Results:

  • Some glucose-lowering medications showed increased risks of heart failure or amputation despite similar HbA1c levels between treatment and placebo groups.
  • These inconsistencies in cardiovascular outcomes, despite comparable glycemic control, suggest limitations in relying solely on HbA1c.
  • Individual variations in hemoglobin glycation are proposed as a key factor underlying these discrepancies.

Conclusions:

  • Inter-individual variation in hemoglobin glycation significantly contributes to inconsistencies observed in T2D glycemic control and cardiovascular outcomes.
  • HbA1c may not be a universally reliable therapeutic target for all individuals with T2D.
  • Further research and application of these findings are crucial for refining clinical trial designs and patient management strategies in T2D.

Keywords:
cardiovascular diseasesclinical trialsglycated hemoglobinhypoglycemic agentsoutcome assessmenttype 2 diabetes mellitus

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