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Background— Statin therapy reduces adverse outcomes, with a minimal decrease in vessel stenosis. Magnetic resonance imaging (MRI) noninvasively detects atherosclerotic plaque (AP) reduction. We hypothesized that statin-induced AP regression can be monitored by MRI and detected earlier than previously reported and is significantly associated with its lipid-lowering effect.Methods and Results— APs in thoracic aorta were measured by combined surface/transesophageal MRI in 27 patients (treated with simvastatin 20 to 80 mg daily) before and after 6 months of therapy. AP volume and luminal dimensions were measured from 6 cross sections used to construct a 2.4-cm 3D volume of the aorta that included plaque and lumen. Method reproducibility was studied in 10 patients imaged twice, 1 week apart. AP volume was reduced from 3.3±0.1.4 to 2.9±1.4 cm3 at 6 months (P &lt;0.02), whereas luminal volume increase was less accentuated (from 12.0±3.9 to 12.2±3.7 cm3 ,P &lt;0.06). LDL cholesterol decreased by 23% (from 125±32 to 97±27 mg/dL,P &lt;0.05) in 6 months. AP regression (plaque volume/area reduction) was significantly related to LDL cholesterol reduction (P &lt;0.02 andP &lt;0.005, respectively), and luminal volume increase was inversely related to LDL cholesterol reduction (P &lt;0.04). Plaque volume measurement was highly reproducible (intraclass correlationR =0.98 and variability=4.8%). Intraobserver (0.91) and interobserver (0.81) concordances were documented for plaque volume assessment.Conclusions— AP regression and reverse remodeling can be detected accurately by MRI 6 months after statin therapy initiation, and it is strongly associated with LDL cholesterol reduction.

Statin-Induced Cholesterol Lowering and Plaque Regression After 6 Months of Magnetic Resonance Imaging–Monitored Therapy