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本文对连续式YAG激光和直流电在相同条件下消融活体狗心内膜的病理改变,从肉眼、光镜和电镜三个水平进行了对比观察。消融的能量分60,120和240焦耳三组。两种方法消融后的组织学改变均可产生非单纯坏死性心肌损伤。激光消融以局部汽化和组织凝固性坏死为主,而电消融则以组织的变性和水肿出血性改变为主。二者组织损伤的程度均与消融的能量有关。损伤面积的直径,激光约为3～10mm,电约为8～30mm。组织汽化或凝同性坏死的深度,激光约为2～10mm.电约为0～3mm,但后者损伤改变的深度可达20～30mm。结果表明YAG激光心肌消融比相同能量的电消融对心肌损伤更轻,效果更为确切,是目前治疗顽固性心动过速较有发展前途的方法之一。
In this paper, continuous YAG laser and DC were used to ablate the pathological changes of the endocardium of living dogs under the same conditions, and compared with the naked eye, light and electron microscope. Ablation energy points 60,120 and 240 joules three groups. Histological changes after both ablation methods can produce non-simple necrotic myocardial damage. Laser ablation is mainly localized vaporization and tissue coagulation necrosis, while electro-ablation is based on tissue degeneration and edema hemorrhagic changes. The extent of tissue damage both are related to the energy of ablation. Damage the diameter of the area, the laser is about 3 ~ 10mm, electricity is about 8 ~ 30mm. The depth of tissue vaporization or coagulation necrosis, the laser is about 2 ~ 10mm. Electricity is about 0 ~ 3mm, but the latter changes the depth of injury up to 20 ~ 30mm. The results show that the ablation of YAG laser with the same energy is more effective and more effective than the same energy ablation, which is one of the promising methods for the treatment of refractory tachycardia.