Patent ID: 8185194

Claim:
A method for determining a phasic change in a vessel, the method comprising the steps of: introducing a device into a site within a vessel, the device comprising: a pair of excitation electrodes positioned along a portion of the device; and a pair of detection electrodes positioned along a portion of the device, the pair of detection electrodes comprising two detection electrodes having a known distance from one another, the pair of detection electrodes physically positioned in between the pair of excitation electrodes along a portion of the device; operating the device in connection with two or more fluid injections in the vessel at or near the site to obtain two or more conductance values; calculating at least one parallel conductance value and at least one total conductance value at or near the site based upon at least two of the two or more conductance values; and calculating a phasic change in the at least one vessel parameter based upon the known distance of the two detection electrodes from one another, the calculated at least one parallel conductance value, and the calculated at least one total conductance value.