Applications of the Transthoracic Impedance Signal during Resuscitation

Special Topics in Resuscitation Pub Date : 2018-10-17 DOI:10.5772/INTECHOPEN.79382

D. González-Otero, S. R. D. Gauna, J. Gutiérrez, P. Sáiz, J. Ruiz

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引用次数: 2

Abstract

Defibrillators acquire both the ECG and the transthoracic impedance (TI) signal through defibrillation pads. TI represents the resistance of the thorax to current flow, and is mea sured by defibrillators to check that defibrillation pads are correctly attached to the chest of the patient. Additionally, some defibrillators use the TI measurement to adjust the energy of the defibrillation pulse. Changes in tissue composition due to redistribution and movement of fluids induce fluctuations in the TI. Blood flow during the cardiac cycle generates small fluctuations synchronized to each heartbeat. Respiration (or assisted ventilation) also causes changes in the TI. Additionally, during cardiopulmonary resus citation (CPR), chest compressions cause a disturbance in the electrode-skin interface, inducing artifacts in the TI signal. These fluctuations may provide useful information regarding CPR quality, length of pauses in chest compressions (no flow time), presence of circulation, etc. This chapter explores the new applications of the transthoracic imped ance signal acquired through defibrillation pads during resuscitative attempts.

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经胸阻抗信号在复苏中的应用

除颤器通过除颤垫获得心电图和经胸阻抗(TI)信号。TI表示胸腔对电流的阻力，由除颤器测量，以检查除颤垫是否正确附着在患者的胸部。此外，一些除颤器使用TI测量来调整除颤脉冲的能量。由于液体的重新分配和运动而引起的组织成分的变化会引起TI的波动。在心脏周期中，血液流动产生与每次心跳同步的小波动。呼吸(或辅助通气)也会引起TI的变化。此外，在心肺复苏(CPR)过程中，胸部按压会引起电极-皮肤界面的干扰，从而诱发TI信号中的伪影。这些波动可以提供有关心肺复苏术质量、胸外按压暂停时间(无血流时间)、有无循环等方面的有用信息。本章探讨了在复苏尝试期间通过除颤垫获得的经胸阻抗信号的新应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Special Topics in Resuscitation

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