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Postprandial hyperglycemia and glycemic variability: should we care?
Eberhard Standl1, Oliver Schnell, Antonio Ceriello
1Munich Diabetes Research Institute, Munich Helmholtz Centre, Munich, Germany. eberhard.standl@lrz.uni-muenchen.de
Diabetes Care
|April 29, 2011
Summary
Postprandial hyperglycemia and glycemic variability
Area of Science:
- Endocrinology
- Cardiovascular Medicine
- Metabolic Disorders
Background:
- Diabetes mellitus management traditionally focuses on average blood glucose (BG) levels, assessed via HbA1c or fasting plasma glucose (FPG).
- Emerging evidence suggests postprandial hyperglycemia and glycemic variability may independently contribute to diabetes complications.
- Oxidative stress and endothelial dysfunction are implicated mechanisms linking glucose fluctuations to adverse outcomes.
Purpose of the Study:
- To critically evaluate the evidence for and against the impact of postprandial hyperglycemia and glycemic variability on cardiovascular complications in diabetes.
- To assess the role of these glycemic parameters beyond average BG control.
Main Methods:
- Review of pathophysiological studies, epidemiological data, and randomized prospective intervention trials.
- Analysis of evidence linking glucose peaks and excursions to biomarkers of oxidative stress and endothelial dysfunction.
- Evaluation of clinical trial outcomes targeting postprandial hyperglycemia and glycemic variability reduction.
Main Results:
- Pathophysiological studies show strong associations between glucose variability, oxidative stress, and endothelial dysfunction.
- Epidemiological data provide compelling, though not conclusive, support for postprandial hyperglycemia's role in complications.
- Key intervention studies targeting postprandial hyperglycemia have failed to demonstrate significant reductions in hard cardiovascular endpoints.
Conclusions:
- Current evidence from intervention trials does not conclusively support targeting postprandial hyperglycemia or glycemic variability for cardiovascular risk reduction in diabetes.
- Lack of standardized methods for measuring glycemic variability poses a challenge to further research and clinical application.
- Further long-term intervention studies are needed to definitively establish the clinical significance of glycemic variability in diabetes management.
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