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目的 探讨超声物理因素对其损伤灶的影响。方法 使用自行研制的超声导管消融系统，在犬离体右室或左室游离壁热动力学模型上进行超声心室肌消融，并与射频消融比较。结果 电功率与超声损伤灶深度线性相关，损伤面积与辐照时间有正相关关系。电功率是超声消融损伤深度较理想的预测因素，能量是描述损伤面积较好的物理量。换能器／组织接触压与损伤灶大小无明显关系。超声损伤灶的深度远大于射频损伤灶的深度。结论 与射频消融相比，超声消融可造成更深的心肌损伤灶，提示超声消融有可能消除位于较深心肌中的致心律失常病灶，这对于心肌梗塞后室性心动过速的消融有较大的意义。
Objective To investigate the influence of ultrasound physical factors on its lesions. Methods Ultrasound catheter ablation system developed by ourselves was used to perform echocardiogram ablation on isolated canine right ventricle or left ventricular free wall and compared with radiofrequency ablation. Results The electric power was linearly correlated with the depth of ultrasonic lesions, and the area of injury had a positive correlation with the irradiation time. Electric power is a better predictor of the depth of ultrasonic ablation, and energy is a physical quantity that describes the lesion area. Transducer / tissue contact pressure and lesion size no significant relationship. The depth of ultrasonic lesions is much larger than the depth of radio frequency lesions. Conclusion Compared with radiofrequency ablation, ultrasonic ablation can cause deeper myocardial lesion, suggesting that ultrasound ablation may eliminate the arrhythmia lesions located in the deeper myocardium, which has a greater ablation of ventricular tachycardia after myocardial infarction significance.