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首页> 外文期刊>Resuscitation. >Comparison of five different defibrillators using recommended energy protocols.
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Comparison of five different defibrillators using recommended energy protocols.

机译：使用推荐的能量方案比较五种不同的除颤器。

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Biphasic defibrillators represent a great step ahead in defibrillation. The manufacturers claim that biphasic defibrillators are able to compensate for differences in transthoracic impedance. That should mean that all patients should be defibrillated with approximately the same amount of current, regardless of their transthoracic impedance. We assessed one monophasic and four biphasic defibrillators. The defibrillators were discharged into resistive loads of 50, 90 and 130 Omega, simulating transthoracic impedance. For each waveform we used energy protocols recommended by the manufacturers and guidelines 2005. Waveforms were observed with on a digitising oscilloscope on a current sensing resistor. We compared the electrical properties of different waveforms and two defibrillators with the same type of waveform. The influence of different impedance on shape, duration and amplitude of current flow were also observed for each waveform. Measurements showed a significant difference in current flow at different impedance loads. At low impedance the mean current is well above expectations for all the defibrillators studied and at high impedance load we observed a big reduction of current amplitude. We can conclude that the compensating mechanisms of biphasic defibrillators are, from electrical point of view, negligible. From the laws of physics it is practically impossible to keep same level of current at given time with same energy at higher impedance. That is why we should reconsider the use of different energy equivalents between patients with different transthoracic impedance and not between different defibrillation impulses.
机译：双相除颤器代表着除颤方面的一大进步。制造商声称，双相除颤器能够补偿经胸阻抗的差异。这意味着，无论患者的经胸阻抗如何，均应使用几乎相同的电流对所有患者进行除颤。我们评估了一个单相除颤器和四个双相除颤器。除颤器放电至50、90和130Ω的电阻性负载，模拟经胸阻抗。对于每种波形，我们使用制造商和准则2005推荐的能量协议。在数字示波器上，在电流检测电阻上观察到了波形。我们比较了不同波形的电学特性和两个具有相同波形类型的除颤器的电学特性。对于每个波形，还观察到不同阻抗对电流的形状，持续时间和幅度的影响。测量表明，在不同的阻抗负载下，电流流动存在显着差异。在低阻抗下，平均电流远高于所有研究的除颤器的期望值;在高阻抗负载下，我们观察到电流幅度大大降低。我们可以得出结论，从电学角度来看，双相除颤器的补偿机制可忽略不计。根据物理定律，实际上不可能在给定的时间以更高的阻抗以相同的能量保持相同水平的电流。这就是为什么我们应该重新考虑在具有不同经胸阻抗的患者之间而不是在不同的除颤脉冲之间使用不同的等效能量。

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