This study sought to explore the association between the Framingham Risk Score (FRS) and coronary plaque characteristics assessed by optical coherence tomography (OCT) imaging.
Clinical prediction models are useful for identifying high-risk patients. However, coronary events often occur in individuals estimated to be at low risk.
A total of 254 patients with coronary artery disease who underwent three-vessel OCT were divided into tertiles according to FRS. Nonculprit plaque characteristics were compared among the three groups.
A total of 663 plaques were analyzed. FRS was significantly associated with calcification [37% (low FRS) vs. 46% (intermediate FRS) vs. 70% (high FRS); P<0.001] and neovascularization [39% (low FRS) vs. 41% (intermediate FRS) vs. 56% (high FRS); P<0.001], but not with lipid-rich plaques or thin-cap fibroatheroma (TCFA). On multivariate analysis, FRS was an independent predictor of the presence of both calcification and neovascularization. There were no deaths, two acute myocardial infarctions, and 15 nontarget lesion revascularizations at the 1-year follow-up. The event rate increased progressively across FRS tertiles [2.4% (low FRS) vs. 7.1% (intermediate FRS) vs. 8.6% (high FRS); P=0.186]. The c-statistic for FRS to predict future clinical events was 0.628 (95% confidence interval, 0.500−0.757). The addition of both calcification and TCFA to FRS provided incremental prognostic value [c-statistics: 0.761 (95% confidence interval, 0.631−0.890)].
The present study showed significant associations between FRS and the presence of coronary calcification and neovascularization in nonculprit plaques. The combination of FRS and OCT-detected calcifications and TCFA provides improved prognostic ability in identifying patients with known coronary artery disease who are at risk of recurrent events.
bBiostatistics Center, Massachusetts General Hospital, Harvard Medical School, Boston
cNational Heart, Lung, and Blood Institute, The Framingham Heart Study, Framingham, Massachusetts, USA
dDepartment of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
eCardiovascular Department, Ospedale Papa Giovanni XXIII, Bergamo
fDepartment of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy
gDepartment of Cardiology, Nara Medical University, Nara, Japan
hDivision of Cardiology, Kyung Hee University, Seoul, South Korea
Correspondence to Ik-Kyung Jang, MD, PhD, Cardiology Division, Massachusetts General Hospital, Harvard Medical School, GRB 800, 55 Fruit Street, Boston, MA 02114, USA Tel: +1 617 726 9226; fax: +1 617 726 7416; e-mail: email@example.com
Received April 4, 2016
Received in revised form April 11, 2016
Accepted April 18, 2016