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快速性心律失常的治疗已进入一个新纪元——介入性电生理消融治疗。消融疗法可采用多种能源,本文结合临床就其生物物理特性进行叙述。一、高能直流电能经电极导管将高能直流电能输送到与远端电极相接触的心肌组织,造成的病损可以很深。由于瞬间通过的电流强度和电压很高,可破坏导管的导电性能,故在导管使用前后需常规测量导管的电阻。放电能量为300～400J时,远端电极可产生1000～3000V电压,电极表面温度急剧上升可达5000℃,与电极接触的血浆迅速汽化,形成气泡、电弧和火球现象。气泡可在15ms内扩大爆裂并产生高达70磅/时~2的压力。气泡的体积与放电
Tachyarrhythmia treatment has entered a new era - interventional electrophysiological ablation. Ablation therapy can use a variety of energy sources, this article combined with clinical description of its biophysical properties. First, the high-energy DC through the catheter will be high-energy direct current energy delivered to the distal electrode contact with the myocardial tissue, causing lesions can be deep. Due to the instantaneous high current strength and voltage can damage the conductivity of the catheter, so before and after the catheter to be used routinely measure the resistance of the catheter. When the discharge energy is 300-400J, the far-end electrode can generate a voltage of 1000-3000V, the surface temperature of the electrode rises sharply up to 5000 ℃, and the plasma in contact with the electrode rapidly vaporizes to form a bubble, an arc and a fireball phenomenon. Bubbles expand burst within 15ms and produce pressures as high as 70 psi. Bubble volume and discharge