Compensatory enlargement of angiographically normal coronary segments in patients with coronary artery disease. In vivo documentation using intravascular ultrasound.

Abstract:

:Intravascular ultrasound (IVUS) frequently reveals plaque formation at sites with a normal angiographic appearance. However, whether angiographically normal coronary arteries undergo adaptive expansion in vivo remains uncertain. The authors studied 12 patients (11 men, 1 woman; mean age fifty-three +/- ten years [mean +/- SD]) with focal coronary stenosis. Sixty IVUS images from angiographically normal coronary segments were analyzed (14 left main, 44 left anterior descending, and 2 left circumflex coronary arteries). The mean percent area stenosis was 36 +/- 5% and the circular shape factor of the lumen cross section averaged 0.97 +/- 0.02. Both total arterial area and internal elastic lamina area increased as the plaque area expanded (y = 2.13x + 8.07, r = 0.87, P = 0.0001; y = 2.06x + 4.57, r = 0.87, P = 0.0001, respectively), suggesting that for every 1 mm2 increase in plaque area, the total arterial area increased by approximately 2.13 mm2 and the internal elastic lamina area increased by approximately 2.06 mm2. The lumen area also increased as the plaque area expanded (y = 1.06x + 4.57, r = 0.68, P = 0.0001), suggesting that for every 1 mm2 increase in plaque area, the lumen area increased by approximately 1.06 mm2. The medial area did not correlate with the plaque area (r = 0.15, P = 0.26). Thus, compensatory enlargement precedes development of angiographically, detectable coronary atherosclerosis. Furthermore, in early stages of atherosclerosis, arterial enlargement may overcompensate for plaque area. The reduction of the total medial mass does not appear to contribute to the mechanism of compensatory enlargement.

journal_name

Angiology

journal_title

Angiology

authors

Nakamura Y,Takemori H,Shiraishi K,Inoki I,Sakagami M,Shimakura A,Usuda K,Kubota K,Takata S,Kobayashi K

doi

10.1177/000331979604700804

subject

Has Abstract

pub_date

1996-08-01 00:00:00

pages

775-81

issue

8

eissn

0003-3197

issn

1940-1574

journal_volume

47

pub_type

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