Glycemic Variability on Continuous Glucose Monitoring System Correlates With Non-Culprit Vessel Coronary Plaque Vulnerability in Patients With First-Episode Acute Coronary Syndrome - Optical Coherence Tomography Study.
Level 3 - non-randomized controlled study
Prospective observational cohort study examining physiological parameters and imaging markers
PubMed 26511357 · doi:10.1253/circj.CJ-15-0790
What was done
A prospective observational study evaluated 46 patients presenting with first-episode acute coronary syndrome (ACS). Glycemic variability was measured using a continuous glucose monitoring system and quantified by the mean amplitude of glycemic excursion (MAGE). Patients were categorized into MAGE tertiles. Optical coherence tomography (OCT) was performed on non-culprit coronary vessels with mild-to-moderate stenosis to evaluate plaque characteristics, including fibrous cap thickness and the presence of thin-cap fibroatheroma (TCFA).
What was found
TCFA was observed in 13 (28%) of the 46 patients. Patients in the high MAGE tertile had significantly thinner fibrous caps (80±40 µm) compared to the intermediate (152±122 µm) and low tertiles (155±102 µm; P=0.01). TCFA was also more common in the high MAGE group (50%) than in the intermediate (27%) and low (7%) groups (P=0.03). On multivariate logistic regression, high MAGE was the only significant independent determinant of TCFA after adjusting for coronary risk factors (OR 5.000, P=0.021) as well as HOMA-IR and HbA1c (OR 5.674, P=0.018).
Why it matters
The findings suggest that acute glycemic fluctuations, independent of baseline HbA1c or insulin resistance, are associated with widespread coronary plaque vulnerability beyond the culprit acute lesion.
Limits
The sample size was very small (n=46), limiting precision and multivariable adjustment robustness. The study design is observational and cannot determine whether glycemic variability directly causes plaque destabilization or is a marker of acute stress. Long-term clinical cardiovascular outcomes were not assessed.
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