Patent ID: 8805490

Claim:
An apparatus for use in generating an electric field across a patient's body during an electrophysiology study, comprising: a computer system having a plurality of inputs configured to be coupled to a plurality of surface electrodes, wherein the computer system comprises at least one processor programmed to: drive at least one pair of the plurality of surface electrodes to create an electrical field across the patient's body; measure at least one biologic impedance encountered by the electrical field with respect to at least one undriven surface electrode of the plurality of surface electrodes; calculate a mean absolute value of the measured at least one biologic impedance as a function of time, Pm(t); save an initial calculated mean absolute value of the measured at least one biologic impedance, Pa; and multiply an impedance measurement between a measurement electrode and a reference electrode by a ratio, Pa/Pm(t), to compute a scaled impedance.