| 摘要 |
An improved method and device for measuring transthoracic impedance through an ECG cable and electrodes, in which the measurement accuracy is substantially unaffected by shunt capacitance and series resistance within the cable, said device comprising a means for repetitively injecting alternating polarity impulses of charge into the ECG cable and electrodes, a demodulator, and a low pass filter. The measurement performed by integration of the transient voltage induced by the injected charge responds primarily to the resistive components of the cable and patient impedance, and substantially rejects the effects of the shunt capacitance.
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