Abstract
Prior intravascular ultrasound (IVUS) trials suggest slowing of coronary plaque progression with some medicines but have not shown convincing evidence of regression using angiotension-II receptor blocking agents (ARB). A prospective, double-blind, randomized, multicenter trial (Impact of OLmesartan on progression of coronary atherosclerosis; evaluation by IntraVascular UltraSound [OLIVUS]) was performed in 247 stable angina pectoris patients with native coronary artery lesions. When these patients underwent percutaneous coronary intervention for culprit lesions, IVUS was performed in their non-culprit vessels (without angiographically documented coronary stenosis [<50%]). Patients were randomly assigned to receive 20 mg of Olmesartan or control, and treated with a combination of β-blockers, calcium channel blockers, diuretics, nitrates, glycemic control agents and/or statins per physician’s guidance. Patients already on ACE inhibitors or other ARBs were excluded. Serial IVUS examinations (baseline and 14-months follow-up) were performed to assess coronary plaque volume. Volumetric IVUS analyses (mean measured length:41.2 ± 8.7mm) included lumen (LV), plaque (PV), vessel volume (VV), percent plaque volume (% PV), percent change in total PV (PCPV) and percent change in % PV (PC%PV). At baseline, patient characteristics and all IVUS parameters were identical between the two groups. However, follow-up IVUS showed significantly decreased PCPV and PC%PV in the Olmesartan group, despite similar blood pressure (table ). In addition, multivariate analysis identified Olmesartan administration as one of the factors that decreased plaque volume (β-coefficient −0.29 (95%CI, −0.7 to 0.4), p<0.01). These observations suggest a positive role in potential plaque regression through the administration of Olmesartan, an angiotension-II receptor blocking agent, for patients with stable angina pectoris.
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