文摘
Background Patients with type 2 diabetes are at increased risk for both, left ventricular (LV)-dilatation and myocardial infarction (MI) following the rupture of a vulnerable plaque. This study investigated the to date incompletely understood relationship between plaque vulnerability and LV-dilatation using optical coherence tomography (OCT) and cardiac magnetic resonance imaging (CMR) in patients with type 2 diabetes and stable coronary artery disease. Methods CMR was performed in 58 patients with type 2 diabetes, in which 81 coronary lesions were investigated using OCT. Results A decreased minimal fibrous cap thickness (FCT) of coronary lesions was associated with an increase of several CMR-derived parameters including LV-end diastolic volume (LVEDV, r--.521, p-lt;-.001), LV-end diastolic diameter (r--.502, p-lt;-.001) and LV-end systolic volume (r--.467, p--.001). Similar results were obtained for mean FCT. Furthermore, patients with dilated versus non-dilated LV differed significantly in several cardiovascular risk factors including previous MI (47.1% vs. 14.6%, p--.009), HDL-cholesterol (40.35?±-.57?mg/dl vs. 45.20?±-0.79?mg/dl, p--.029) and smoking (82.4% vs. 51.2%, p--.027). However, minimal FCT is associated to LV-dilatation independent of previous MIs (odds ratio 0.679, p--.022). Receiver-operating curve analysis demonstrated that CMR-derived LVEDV predicts plaque vulnerability with low-moderate diagnostic efficiency (area under the curve 0.699) and considerate specificity (83.3%) at the optimal cut-off value (159.0?ml). Conclusion These data suggest that vulnerability of coronary lesions is associated with LV-dilatation in high risk patients with type 2 diabetes. CMR may be a useful adjunct to the risk-stratification in this population. Future studies are warranted to investigate potential mechanisms linking plaque vulnerability and LV-dilatation.