A mapping catheter comprises a catheter body and a mapping assembly. The
catheter body has an outer wall, proximal and distal ends, and at least
one lumen extending therethrough. The mapping assembly comprises a
generally straight proximal region attached to the catheter body, a
generally circular main region distal the proximal region having an outer
circumference, and a generally straight distal region distal the main
region. The mapping assembly also comprises a support member having
shape-memory, a non-conductive covering over the support member, and a
plurality of electrodes on the non-conductive covering along the
generally circular main region.