Arruda A M, Pellikka P A, Mahoney D W, Joseph A, Mathias W, Seward J B
Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.
Am J Cardiol. 2000 Nov 1;86(9):919-22. doi: 10.1016/s0002-9149(00)01122-x.
To characterize Doppler flow patterns of the grafted left internal mammary artery (LIMA) in patients with and without dobutamine stress induced wall motion abnormalities in the graft distribution, we studied 29 patients who underwent coronary artery bypass surgery using LIMA grafts to the left anterior descending coronary artery (LAD). The ungrafted right internal mammary artery (RIMA) was used as a control. RIMA Doppler flow pattern was predominantly systolic in all patients. In patients without ischemia in the LAD distribution, LIMA flow was predominantly diastolic. In patients with ischemia, LIMA flow was predominantly systolic. In the grafted LIMA, a ratio of diastolic to systolic time-velocity integral of > 1.5 best showed absence of ischemia in the graft distribution. In summary, characterization of the Doppler flow pattern in the internal mammary arteries is feasible. In the grafted LIMA, ratios of diastolic to systolic flow are less in patients with an ischemic response in the subtended vascular bed than in those without ischemia.
为了描述在移植分布区存在或不存在多巴酚丁胺负荷诱导的壁运动异常的患者中，移植的左乳内动脉（LIMA）的多普勒血流模式，我们研究了29例接受冠状动脉旁路移植术的患者，这些患者使用LIMA移植至左前降支冠状动脉（LAD）。未移植的右乳内动脉（RIMA）用作对照。所有患者的RIMA多普勒血流模式主要为收缩期。在LAD分布区无缺血的患者中，LIMA血流主要为舒张期。在有缺血的患者中，LIMA血流主要为收缩期。在移植的LIMA中，舒张期与收缩期时间-速度积分之比>1.5最能表明移植分布区无缺血。总之，乳内动脉多普勒血流模式的特征描述是可行的。在移植的LIMA中，与无缺血的患者相比，在受支血管床有缺血反应的患者中，舒张期与收缩期血流之比更低。
