Patent ID: 8761876
Filing Date: 2014-06-24
Classification: A61B,A61N

Abstract:
1. A method comprising: measuring a first impedance signal between at least first and second electrodes, which define a first electrode configuration, in a subject's thorax; extracting from the first impedance signal, a first cardiac stroke signal and a corresponding first respiration signal, if a corresponding heartbeat is not deemed arrhythmic; computing a first comparative measurement between the first cardiac stroke signal and the first respiration signal; measuring a second impedance signal between at least third and fourth electrodes, which define a second electrode configuration, in a subject's thorax, wherein at least one of the third and fourth electrodes is a different electrode from at least one of the first and second electrodes; extracting from the second impedance signal, a second cardiac stroke signal and a corresponding second respiration signal, if a corresponding heartbeat is not deemed arrhythmic; computing a second comparative measurement between the second cardiac stroke signal and the second respiration signal; and using the first and second comparative measurements as a basis for selecting of the first and second electrode configurations for subsequent extraction of at least one of the respiration and cardiac stroke signals.