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01-11-2014 | Original Article

Impact of tissue characteristics on luminal narrowing of mild angiographic coronary stenosis: assessment of integrated backscatter intravascular ultrasound

Authors: Makoto Iwama, Shinichiro Tanaka, Toshiyuki Noda, Tomonori Segawa, Masanori Kawasaki, Kazuhiko Nishigaki, Taro Minagawa, Sachiro Watanabe, Shinya Minatoguchi

Published in: Heart and Vessels | Issue 6/2014

Abstract

Integrated backscatter intravascular ultrasound (IB-IVUS) is a useful method for analyzing coronary plaque tissue. We evaluated whether tissue composition determined using IB-IVUS is associated with the progression of stenosis in coronary angiography. Sixty-three nontarget coronary lesions in 63 patients with stable angina were evaluated using conventional IVUS and IB-IVUS. IB-IVUS images were analyzed at 1-mm intervals for a length of 10 mm. After calculating the relative areas of the tissue components using the IB-IVUS system, fibrous volume (FV) and lipid volume (LV) were calculated through integration of the slices, after which percentages of per-plaque volume (%FV/PV, %LV/PV) and per-vessel volume (%FV/VV, %LV/VV) were calculated. Progression of coronary stenosis was interpreted from the increase in percent diameter stenosis (%DS) from baseline to the follow-up period (6–9 months) using quantitative coronary angiography. %DS was 24.1 ± 12.8 % at baseline and 23.2 ± 13.7 % at follow-up. Using IB-IVUS, LV was 31.7 ± 10.5 mm³, and %LV/PV and %LV/VV were 45.6 ± 10.3 % and 20.2 ± 6.0 %, respectively. FV, %FV/PV, and %FV/VV were 35.5 ± 12.1 mm³, 52.1 ± 9.5 %, and 23.4 ± 7.1 %, respectively. The change in %DS was −0.88 ± 7.25 % and correlated closely with %LV/VV (r = 0.27, P = 0.03) on simple regression. Multivariate regression after adjustment for potentially confounding risk factors showed %LV/VV to be correlated independently with changes in %DS (r = 0.42, P = 0.02). Logistic regression analysis after adjusting for confounding coronary risk factors showed LV (odds ratio 1.08; 95 % confidence interval 1.01–1.16; P = 0.03) and %LV/VV (odds ratio 1.13; 95 % confidence interval 1.01–1.28; P = 0.03) to be independent predictors of the progression of angiographic coronary stenosis. Our findings suggest that angiographic luminal narrowing of the coronary artery is likely associated with tissue characteristics. IB-IVUS may provide information about the natural progression of luminal narrowing in coronary stenosis.

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Title: Impact of tissue characteristics on luminal narrowing of mild angiographic coronary stenosis: assessment of integrated backscatter intravascular ultrasound
Authors: Makoto Iwama
Shinichiro Tanaka
Toshiyuki Noda
Tomonori Segawa
Masanori Kawasaki
Kazuhiko Nishigaki
Taro Minagawa
Sachiro Watanabe
Shinya Minatoguchi
Publication date: 01-11-2014
Publisher: Springer Japan
Published in: Heart and Vessels / Issue 6/2014
Print ISSN: 0910-8327
Electronic ISSN: 1615-2573
DOI: https://doi.org/10.1007/s00380-013-0428-9

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