The present invention provides for a method and apparatus providing pacing
to improve the hemodynamics of the heart for patients with AV nodal
block, right/left bundle branch block, and heart failure. A lead body
having at least one conductor with an insulative sleeve is introduced
into the right atrium of a heart. A partially masked helical electrode
connected to the conductor is then secured preferably into the atrial
aspect of the atrioventricular septum. The electrical conductor is then
rotated such that an unmasked portion of the electrode is moved to a
depth within the heart tissue substantially near the heart's intrinsic
conduction system. This method and apparatus allow pacing in a natural
manner via low power stimulation of the heart's intrinsic conduction
system.