Relationship between fluctuations in glucose levels measured by continuous glucose monitoring and vascular endothelial dysfunction in type 2 diabetes mellitus.
Level 4 - case-series / case-control
Cross-sectional observational study
PubMed 23280391 · doi:10.1186/1475-2840-12-1
What was done
Researchers investigated 57 hospitalized patients with type 2 diabetes mellitus to assess the relationship between glucose fluctuations and vascular endothelial function. Blood glucose fluctuations were measured over 24 hours using continuous glucose monitoring on admission day 2. Endothelial function was evaluated on admission day 3 by measuring the reactive hyperemia index using peripheral arterial tonometry.
What was found
The natural logarithmic-scaled reactive hyperemia index (L_RHI) correlated inversely with the standard deviation of glucose (r = -0.504, P < 0.001), mean amplitude of glycemic excursions (MAGE) (r = -0.571, P < 0.001), mean postprandial glucose excursion (r = -0.411, P = 0.001), and percentage of time >= 200 mg/dl (r = -0.292, P = 0.028). In 12 patients with hypoglycemia, L_RHI also correlated inversely with the percentage of time in hypoglycemia (r = -0.589, P = 0.044). L_RHI showed no significant correlation with HbA1c, fasting plasma glucose, LDL cholesterol, HDL cholesterol, triglycerides, or blood pressure. Multivariate analysis identified MAGE as the only significant determinant of L_RHI.
Why it matters
The findings indicate that short-term glycemic variability may be more closely tied to endothelial impairment in type 2 diabetes than conventional static markers like HbA1c or fasting glucose.
Limits
The study is a cross-sectional observational design with a small sample size (n = 57), which cannot establish causality. Glucose monitoring was limited to a single 24-hour period, and hard cardiovascular outcomes were not evaluated.
Cited by
- supports Repeated, continuous spikes of glucose and insulin cause arterial plaque formation.