Relationship Between Microalbuminuria and Vulnerable Plaque Components in Patients With Acute Coronary Syndrome and With Diabetes Mellitus : – Virtual Histology-Intravascular Ultrasound –
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Background: The purpose of the present study was to use virtual histology-intravascular ultrasound (VH-IVUS) to evaluate the relationship between microalbuminuria and plaque components in 920 patients. Methods and Results: Patients with albumin levels <30mg/g creatinine were defined as having normoalbuminuria (n=824), and those with albumin levels 30-300mg/g as having microalbuminuria (n=96). The microalbuminuria group contained more patients with acute coronary syndrome (ACS; 72% vs. 61%, P=0.018) and more patients with diabetes (53% vs. 26%, P<0.001). In ACS patients, %necrotic core (NC) volume was significantly greater in the microalbuminuria group compared with the normoalbuminuria group (19±10% vs. 15±9%, P=0.019), but not in patients with stable angina. In ACS patients, thin-cap fibroatheroma (TCFA) was observed more frequently in the microalbuminuria group (36% vs. 18%, P=0.008), and microalbuminuria was the independent predictor of TCFA (odds ratio [OR], 1.106; 95% confidence interval [CI]: 1.025-1.144, P=0.018). In diabetic patients, %NC volume was significantly greater in the microalbuminuria group compared with the normoalbuminuria group (20±9% vs. 16±10%, P=0.017), but not in non-diabetic patients. In diabetic patients, TCFA was observed more frequently in the microalbuminuria group (38% vs. 17%, P=0.002) and microalbuminuria was the independent predictor of TCFA (OR, 1.120; 95%CI: 1.038-1.204, P=0.012). Conclusions: Microalbuminuria was associated with a higher number of vulnerable plaque components in ACS and diabetic patients. More intensive medical therapy is needed to stabilize the vulnerable plaque if microalbuminuria is observed in diabetic ACS patients. (Circ J 2011; 75: 2893-2901)
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