Objective Apply conventional and strain rate ultrasound to evaluate left atrial morphous and systolic changes of paroxysmal atrial fibrillation patients after radiofrequency catheter ablation, and to explore the value of strain rate imaging in the evaluation of atrial myocardial function. Methods 28 cases with paroxysmal atrial fibrillation were checked by ultrasound before radiofrequency catheter ablation, 1 week and 3 months after operation. Conventional structure and flow velocity parameters; ,such as anteroposterior diameter, maximum volume, minimum volume and former volume before contraction of left atrial were measured, and stroke volume, ejection fraction were calculated. Strain rate analysis software were used to obtain the average strain rate (mSRa) of valve annular, midpiece and base of interatrial septum and lateral wall. Results Conventional parameters were not significantly different between before and 1 week after operation. After 3 months anteroposterior maximum volume, minimum volume and former volume before contraction of left atrial were smaller and stroke volume, ejection fraction, A wave peak velocity, systolic motion velocity of mitral annular tissue A 'were bigger than those before operation and after 1 week. After 1 week mSRa of base and midpiece of interatrial septum were smaller than those before operation. mSRa after 3 months were more than that after lweek . Between after 3months and before operation these parameters had not significantly different. After lweek and 3 months mSRa of base and midpiece of ateral wall were smaller than those before operation . There were no significant differences between the these two time. The mitral annular part had no significant differences in all three time. Conclusion After radiofrequency catheter ablation the left atrial systolic function occurred deterioration in the short - term, the phenomenon called stunning. After 3 months left atrial systolic function restored. Strain rate imaging and conventional echocardiogram can evaluate atrial systolic function changes more completely.%目的 应用常规超声及超声应变率显像技术评价经导管射频消融术后左房形态及收缩功能的变化,评价应变率显像技术检测心房心肌收缩功能的应用价值.方法 分别对28例房颤患者于导管射频消融术前、术后1周及术后3个月行超声心动图检查,测量左房的前后径、最大容积、最小容积和收缩前容积,计算左房每搏量和主动射血分数等参数.应用应变率分析软件测量左房房间隔和侧壁瓣环段、中段和心底段的平均应变率(mSRa)并相比较.结果 阵发性房颤患者术后1周各常规超声参数与术前比较差异无统计学意义,术后3个月与术前及术后1周比较,最大容积、最小容积和收缩前容积减小,左房每搏量、主动射血分数、心房收缩期A峰峰值流速、左房室瓣环间隔侧组织运动速度A'等指标增大.房间隔心底段和中段mSRa术后1周较术前减小,术后3个月较术后1周增大,与术前比较差异无统计学意义.侧壁基底段和中段术后1周及术后3个月较术前减小,术后3个月较术后1周差异无统计学意义.瓣环段差异在术前术后差异均无统计学意义.结论 射频消融术后1周心房收缩功能发生了短暂的恶化即左心房收缩功能发生了顿抑,术后3个月收缩功能逐渐恢复.应变率显像技术结合传统超声可以更全面评价心房收缩功能的变化.
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