| 摘要 |
A system and method of detecting a loss of electrical contact between a pair of electrodes that are electrically coupled to skin of a subject. The method includes monitoring parameters of a transthoracic impedance between the pair of electrodes in at least one of a low frequency regime and a high frequency regime, detecting an occurrence of chest compressions based on a signal indicative of chest compressions, establishing baseline levels of the parameters in at least one of the low and high frequency regimes, detecting whether changes in at least one parameter exceeds the baseline level by a threshold, determining that at least one electrode of the pair of electrodes is losing electrical contact with the skin responsive to the at least one parameter exceeding the baseline level by the threshold, and issuing an alert in response to a determination that the at least one electrode is losing electrical contact. |
| 主权项 |
1. A life support device, comprising:
a pair of electrodes configured to be attached to a skin of a subject; a therapy interface electrically coupled to the pair of electrodes; and a transthoracic impedance monitor electrically coupled to the therapy interface, the transthoracic impedance monitor being configured
to monitor transthoracic impedance parameters of a transthoracic impedance signal between the pair of electrodes over time, wherein the transthoracic impedance signal has a high frequency waveform component that varies with a frequency of CPR chest compressions, and wherein the transthoracic impedance parameters include at least one of a slope of the high frequency waveform component of the transthoracic impedance signal, a shape of the high frequency waveform component of the transthoracic impedance signal, and a relative energy content of the high frequency waveform component of the transthoracic impedance signal at a fundamental frequency of the transthoracic impedance signal and/or at a harmonic of the fundamental frequency of the transthoracic impedance signal,to establish baseline levels of the transthoracic impedance parameters,to detect whether changes over time in at least one transthoracic impedance parameter exceeds a corresponding baseline level by a threshold,to determine that at least one electrode of the pair of electrodes is losing electrical contact with the skin of the subject in response to detecting that the changes in the at least one transthoracic impedance parameter exceeds the corresponding baseline level by the threshold, andto issue an alert in response to a determination that the at least one electrode of the pair of electrodes is losing electrical contact with the skin of the subject. |
