Sloth E, Houlind K C, Oyre S, Kim W Y, Pedersen E M, Jørgensen H S, Hasenkam J M
Department of Anaesthesia, Aarhus Kommune Hospital, Denmark.
Am Heart J. 1994 Dec;128(6 Pt 1):1130-8. doi: 10.1016/0002-8703(94)90743-9.
Detailed data on blood velocity fields in the normal human main pulmonary artery are an essential platform for discriminating physiologic from pathologic pulmonary flow patterns. Over the years, many studies have revealed quite inconsistent data mainly because of lack of suitable measuring techniques. By using combined cardiac- and respiratory-triggered magnetic resonance phase velocity mapping, very consistent data were obtained in 12 volunteers. In all subjects the location of the highest axial velocities was shifted from the inferior-right toward the superior-left part of the vessel area during the right ventricular contraction, with rapidly decreasing velocities to the inferior right evolving into retrograde flow in the deceleration phase. The mean temporal velocity profile was consistently skewed with a low flow region also toward the inferior-right vessel wall. The magnetic resonance phase shift method used in this study provided remarkably consistent high-quality data about human pulmonary artery velocity fields. This is most likely because of the use of combined cardiac and respiratory triggering.
关于正常人体主肺动脉中血流速度场的详细数据是区分生理性与病理性肺血流模式的重要平台。多年来，许多研究揭示的数据相当不一致，主要原因是缺乏合适的测量技术。通过使用心脏和呼吸触发相结合的磁共振相速度映射，在12名志愿者中获得了非常一致的数据。在所有受试者中，右心室收缩期间，最高轴向速度的位置从血管区域的右下方向左上部分移动，速度迅速下降至右下，在减速期演变为逆向血流。平均时间速度剖面始终呈倾斜状，低血流区域也朝向右下血管壁。本研究中使用的磁共振相移方法提供了关于人类肺动脉速度场的非常一致的高质量数据。这很可能是由于使用了心脏和呼吸触发相结合的方法。
