| http://www.w3.org/ns/prov#value | - Operation of the impedance catheter 39: With reference to the embodiment shown in FIG. 1B, the voltage difference between the detection electrodes 42 and 43 depends on the magnitude of the current, I, multiplied by the distance, D, between the detection electrodes and divided by the conductivity, C, of the fluid and the cross-sectional area, CSA, of the artery or other organs into which the cathet
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