左心耳充盈排空功能的超声研究

目的：应用超声组织速度显像（TVI）技术对持续性房颤患者左心耳充盈和排空功能变化特点进行研究。方法：选择29例持续性房颤患者（房颤组）和31例对照者（对照组），在食管超声心动图（TEE）条件下获取左心耳超声图像，应用TVI技术对左心耳壁各节段收缩期峰值速度（PSV）和舒张早期峰值速度（PDVE）及其相关指标进行定量分析。结果：对照组左心耳壁顶部PSV和PDVs高于其余节段（P〈0．05），房颤组左心耳壁各节段PSV和PDVE较对照组均降低（P〈0．01）。对照组心耳顶部PSV与左心耳面积变化率（LAA—EF）和左心耳充盈速度（LAA—EV）呈正相关（r=0．656、0．712，P〈0．001），房颤组心耳顶部PSV与左房腔内径（LADd）呈线性负相关（r=-0．66，P〈0．001）。结论：TVI技术可定量评价左心耳排空及充盈功能，左心耳顶部PSV是反映左心耳整体排空功能的有效指标。

Assessment of the left atrial appendage function by tissue velocity imaging

Objection: To assess the feasibility of measuring left atrial appendage(LAA) function with tissue velocity imaging in patients with persistent atrial fibrillation(AF),and to explores its mechanical movement changes in pathological conditions.Methods: Thirty one controls and 29 patients with persistent AF are studied.Tissue velocity imaging(TVI) was performed with offline analysis in 5 segments of LAA wall.TVI detected a systolic(PSV) and diastolic(PDVE) deformation induced by LAA active motion.Results: At the tip of LAA,PSV and PDVE were higher than other segments in controls(P<0.01).PSV and PDVE in AF group had no statistical difference in 5 segments of LAA(P>0.05).PSV in controls taken from the tip of the LAA was positively correlated with LAA-EV and LAA-EF(r=0.656,0.712,P<0.001,respectively).PSV in AF group taken from the tip of the LAA was negatively correlated with LAD(r=-0.66,P<0.001).At the tip of LAA,PSV and PDVE were higher in controls than those in AF group(P<0.01).Conclusion: TVI has high evaluative values in assessing LAA function.The tip PSV plays an important role in LAA emptying function.