Absence of adventitial vasa vasorum formation at the coronary segment with myocardial bridge - An optical coherence tomography study

作者：Nishimiya Kensuke; Matsumoto Yasuharu; Wang Hongxin; Piao Zhonglie; Ohyama Kazuma; Uzuka Hironori; Hao Kiyotaka; Tsuburaya Ryuji; Takahashi Jun; Ito Kenta; Shimokawa Hiroaki^*

来源：International Journal of Cardiology, 2018, 250: 275-277.

DOI：10.1016/j.ijcard.2017.09.211

• Myocardial bridge
• Optical coherence tomography
• Vasa vasorum
• Adventitia

Background: Myocardial bridge (MB) is a myocardial bundle through which coronary segment tunnels and could compress coronary arteries causing myocardial ischemia. However, the characteristic structural findings of MB remain to be fully elucidated. Recently, we demonstrated that optical coherence tomography (OCT) enables us to visualize adventitial vasa vasorum (VV) formation in humans. In this study, we examined adventitial VV formation at the coronary segment with MB in humans using OCT.
Methods: We examined 15 consecutive patients with suspected angina pectoris and MB in the left anterior descending (LAD) coronary arteries but no angiographic coronary stenosis. MB was detected on coronary angiography as a segment with milking effect. We performed intracoronary OCT imaging along the entire LAD. Morphometric analysis was performed at MB and proximal/distal segments at every 1 mm.
Results: OCT examination showed the absence of adventitial VV formation at MB in the LAD, while VV was clearly noted at both the proximal and distal reference segments. Adventitial VV area was significantly less at MB compared with the proximal or distal references.
Conclusions: These results with OCT imaging indicate that coronary segments with MB lack adventitial VV formation in humans, suggesting that MB could influence morphological and functional changes of the coronary artery.

• 出版日期2018-1-1