Published in:
01-08-2013 | Original Paper
Virtual histology intravascular ultrasound comparison of coronary chronic total occlusions versus non-occlusive lesions
Authors:
Jun Guo, Akiko Maehara, Ning Guo, Kazuhiro Ashida, Amala Chirumamilla, Yunpeng Shang, Jun Pu, Elias Sanidas, Jeffrey W. Moses, Martin B. Leon, Giora Weisz, Gregg W. Stone, Gary S. Mintz, Masahiko Ochiai
Published in:
The International Journal of Cardiovascular Imaging
|
Issue 6/2013
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Abstract
To use virtual histology intravascular ultrasound (VH-IVUS) to assess the differences in tissue composition between chronic total occlusions (CTO) and non-occlusive lesions, especially in vivo. We compared 50 CTOs (49 patients) after guidewire crossing with 41 non-occlusive lesions (41 patients, 25 with unstable angina and 16 with stable angina). Overall, the percentage of necrotic core in the CTO segments was similar to non-occlusive lesions (35.6 vs. 38.7 %, p = 0.18 at the maximum necrotic core site; 24.2 vs. 23.7 %, p = 0.8 in mean analysis over the entire segment length). However, the percentage of dense calcium in CTO segments was less than in non-occlusive lesions (10.6 vs. 14.8 %, p = 0.025 at the maximum necrotic core site; 7.6 vs. 11.4 %, p = 0.036 in mean analysis over the entire segment length). Finally, the necrotic core/dense calcium ratio tended to be larger in the CTO segment than in non-occlusive lesions (2.94 vs. 2.35, p = 0.082 at the maximum necrotic core site; 3.05 vs. 2.03, p = 0.005 in mean analysis over the entire segment length). Overall, 42 (84 %) CTOs contained a fibroatheroma compared to 40 (97 %) of non-occulsive stenoses. The percentage of necrotic core in CTOs with a fibroathroma (39.0 %) was less than non-occlusive stenoses with a VH-thin cap fibroathroma (44.4 %, p = 0.017) and greater than non-occlusive stenoses with a VH-thick cap fibroathroma (33.5 %, p = 0.022) at maximum necrotic core site. These findings suggest that the morphological characteristics of most CTOs were similar as compared with non-CTO lesions and CTOs evolved from fibroatheromas.