Patent ID: 8565851

Claim:
A method of treating a patient, comprising the steps of: advancing through the vasculature of a patient a medical device having a body portion, at least one reference electrode, and a plurality of monophasic action potential electrogram recording electrodes, the plurality of electrodes having a first collapsed configuration and a second expanded configuration, and the at least one reference electrode being located distal of the body portion and proximal of the plurality of monophasic action potential electrogram recording electrodes; transitioning the plurality of monophasic action potential electrogram recording electrodes to the second expanded configuration, the plurality of monophasic action potential electrogram recording electrodes being a radially symmetrical distance from a longitudinal axis of the medical device in different radial directions; positioning the plurality of monophasic action potential electrogram recording electrodes in contact with a target tissue region, the at least one reference electrode being located a distance from the target tissue region; and obtaining at least one monophasic action potential signal from at least one recording electrode.