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- W3120581189 abstract "Background The underlying pathophysiology of coronary artery spasm (CAS) remains unclear. We aim to determine whether coronary artery medial layer thickness is associated with CAS using optical coherence tomography. Methods and Results A total of 50 patients with previous myocardial infarction underwent optical coherence tomography of the left anterior descending artery: 20 with CAS and 30 without CAS. Intimal and medial layer areas were measured by planimetric analysis of optical coherence tomography images. The medial area/external elastic membrane (EEM) area was significantly greater in patients with than without CAS (0.13±0.01 versus 0.09±0.01, respectively, P<0.01), whereas the intimal area/EEM area was similar in the 2 groups. In patients without CAS, the relationship of intimal area/EEM area with medial area/EEM area and coronary diameter response to intracoronary injection of acetylcholine was characterized by an inverted U-shaped curve (y=-1.85x2+0.81x+0.01, R2=0.43, P<0.001) and a U-shaped curve (y=2993.2x2-1359.6x+117.1, R2=0.53, P<0.001), respectively. Thus, the medial layer became thin and the contractile response became weak in coronary arteries with greater intimal area in the non-CAS patients. In contrast, in patients with CAS, the intimal area/EEM area had no significant relationship with the medial area/EEM area in either linear correlation analysis or quadratic regression analysis. Thus, even when the intimal layer thickened, the medial layer did not thin in patients with CAS. Conclusions The structural thickness of the coronary medial layer was increased in patients with CAS, which may provide mechanistic insight into the pathogenesis of CAS. Registration URL: https://www.upload.umin.ac.jp; Unique identifier: UMIN000018432." @default.
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- W3120581189 date "2021-01-19" @default.
- W3120581189 modified "2023-10-13" @default.
- W3120581189 title "Structural Thickening of Medial Layer in Coronary Artery With Spasm in Patients With Myocardial Infarction" @default.
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- W3120581189 doi "https://doi.org/10.1161/jaha.120.018028" @default.
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