An introducer system for use with a pacemaker lead includes a plastic
sheath compatible for insertion within a body, a first end configured for
insertion into the body with a second end extending out of the body. A
central lumen of the sheath is configured to permit introduction of the
lead and includes a flexible, kink-resistant section smooth on its outer
surface with a helical pleat defining a helical groove enabling a
conductor extending from the mapping probe to the pacing system analyzer
to be received in the helical groove of the sheath. A mapping probe at
the first end of the sheath is connectable to a pacing system analyzer
for seeking a location on the myocardial surface of the heart or an
endocardial location at which optimal pacing parameters can be achieved
prior to implantation of the lead.