Transvenous phrenic nerve stimulation system

An electrical stimulation lead for delivering energy to a nerve lying close to a vein of a patient comprising:

• an elongate lead body having a proximal end and a distal end;
• a plurality of electrodes to stimulate a phrenic nerve of the patient, the plurality of electrodes being located along the elongate lead body near the distal end;
• a proximal connector included in the proximal end and having an electrical connection;
• a plurality of conductors located in an interior of the elongate lead body connecting each electrode of the plurality of electrodes to the electrical connection;
• and
• a plurality of bend curves, all of the plurality of bend curves being free of any of the plurality of electrodes and having arcuate shapes to cause a bias force to be exerted by the electrical stimulation lead to maintain the distal end substantially immobile in a pericardiophrenic vein of the patient, wherein at least one bend curve of the plurality of bend curves is configured to apply a bias force to a vessel wall of the pericardiophrenic vein, wherein the at least one bend curve is shaped to deflect around a radius such that the bias force stabilizes the plurality of electrodes in the pericardiophrenic vein.