Patent ID: 8155756

Claim:
A method comprising: positioning a pair of current-delivery electrodes in contact with a patient's body; advancing a multielectrode-bearing delivery device into a coronary sinus and at least partially into a vein of a left ventricle of a patient's heart; positioning an electrode of the multielectrode-bearing device at an optimal location by: delivering current using the pair of current-delivery electrodes to generate a potential field; measuring potentials associated with the potential field using an electrode of the multielectrode-bearing delivery device; mapping motion of the electrode of the multielectrode-bearing delivery device based on the measured potential; and identifying an optimal electrode of the multielectrode-bearing device based on the mapped motion, wherein the location of the optimal electrode corresponds to the optimal location; positioning an electrode at the determined optimal location by: advancing an electrode-bearing lead along the multielectrode-bearing delivery device; and aligning an electrode of the electrode-bearing lead with the optimal electrode of the multielectrode-bearing delivery device; after aligning the electrode of the electrode-bearing lead, retracting the multielectrode-bearing delivery device while maintaining the position of the electrode-bearing lead.