实时三维超声及斑点追踪技术评价心房颤动患者射频消融术前后左心房功能

目的 应用实时三维超声心动图(RT-3DE)和斑点追踪显像技术(STI)评价Carto标测系统引导下的环肺静脉消融术治疗心房颤动对左房功能的近期影响。方法 对30例因阵发性心房颤动行消融治疗的患者于术前、术后3d和术后3个月进行超声心动图检查。应用RT-3DE计算左房最大容积(LAVmax)、左房最小容积(LAVmin)、左房收缩前容积(LAVp)、左房被动射血分数(LAPEF)和左房主动射血分数(LAAEF);应用STI技术获取左房各壁各节段的应变率曲线，分别测量左室收缩期的左房峰值应变率(SRs)、左室舒张早期的左房峰值应变率(SRe)、左室舒张晚期的左房峰值应变率(SRa)。结果 与术前相比，射频消融术后3d左房各壁各节段SRs、SRe和SRa均降低；术后3个月左房前壁、下壁、房间隔各节段SRa和SRe增高，SRs无明显差异，LAVmax和LAVp减小，LAPEF和LAAEF增高。结论 环肺静脉消融术式成功的患者在术后3d左房功能处于“恶化期”，术后3个月左房辅泵功能和管道功能增高。

Evaluation of left atrial function in patients with atrial fibrillation after having catheter ablation by real-time three-dimensional echocardiography and speckle tracking imaging

Objective To evaluate left atrial (LA) function by real-time three-dimensional echocardiography (RT-3D) and speckle tracking imaging (STI) after circumferential ablation of pulmonay vein ostia for atrial fibrillation guided by carto mapping system. Methods Thirty patients who had ablation procedure for paroxysmal atrial fibillation were accepted echocardiography to estimate the LA function at pre-operation,3 days and 3 months of post-operation. The LA maximal, minimal and pre-systolic volume (LAVmax, LAVmin and LAVp), LA passive ejection fraction (LAPEF), LA active ejection fraction (LAAEF) were measured by RT-3DE respectively. The strain rate curve was acquired in each LA segment (anterior, posterior, lateral, inferior and septal) by STI. Systolic strain rate (SRs), early diastolic strain (SRe) and late diastolic strain rate(SRa) of each left atrial segments were measured. Results Comparing with preoperative,3 days post-ablation SRs,SRe and SRa decreased significantly in each wall of LA. After 3 months,SRa and SRe in anterior, inferior and septal were significantly improved, however, SRs showed no significant difference. LAVmax and LAVpre were significantly decreased. LAPEF and LAAEF were significantly improved. Conclusions The patients with circumferential pulmonary vein ablation were in a deterioration after three days. The pump function and conduit functions of left atrial were increased after 3 months.