Abstract: A process for the treatment of atrial arrhythmia by use of ablation procedures comprising circumferential ablation of vessels, particularly pulmonary veins associated with the left atrium of the heart. Also disclosed are medical devices used for formation of the circumferential ablation lesions in vessels associated with the heart.

Abstract: A process for the treatment of atrial arrhythmia by use of ablation and/or mapping procedures comprising ablating discrete ablation tracks within the left and right atrium of the heart by use of precurved left and right atrium guiding introducers, including preferably a guiding introducer system for use in the left atrium comprising an inner and an outer guiding introducer. Also disclosed are shapes for the guiding introducers and the guiding introducer system to be used for the ablation and/or mapping of the discrete tracks within the left and right atrium.

Abstract: A process for the treatment of atrial flutter and/or atrial fibrillation in the right atrium by use of an ablating and/or mapping catheters guided by a guiding introducer. Also disclosed is a predetermined shape for the guiding introducer for use in the treatment of atrial flutter and/or atrial fibrillation in the right atrium.

Abstract: A guiding introducer system for use in the right atrium comprised of an inner guiding introducer and an outer guiding introducer wherein the inner guiding introducer is comprised of a first and second section and the outer guiding introducer is comprised of a first, second and third section. The guiding introducer system is for use in sensing, pacing, and ablating procedures within the right atrium of the human heart.

Abstract: Disclosed are shapes for guiding introducers to be used for the ablation and/or mapping of the discrete tracks within the left and right atrium.

Abstract: A guiding introducer for the treatment of atrial flutter and/or atrial fibrillation in the right atrium by use of an ablating and/or mapping catheters guided by the guiding introducer. Also disclosed is a predetermined shape for the guiding introducer for use in the treatment of atrial flutter and/or atrial fibrillation in the right atrium.

Abstract: A guiding introducer system for use in the left atrium comprised of an inner guiding introducer and an outer guiding introducer wherein the inner guiding introducer is comprised of a first and second section and the outer guiding introducer is comprised of a first and second sections. The guiding introducer system is for use in sensing, pacing, and ablating procedures within the left atrium of the human heart.

Abstract: A process for the treatment of atrial arrhythmia by use of ablation and/or mapping procedures comprising ablating discrete ablation tracks within the left and right atrium of the heart by use of precurved left and right atrium guiding introducers, including preferably a guiding introducer system for use in the left atrium comprising an inner and an outer guiding introducer. Also disclosed are shapes for the guiding introducers and the guiding introducer system to be used for the ablation and/or mapping of the discrete tracks within the left and right atrium.

Abstract: A catheter for mapping and ablating cardiac tissue comprising an elongated catheter body with proximal and distal ends and an electrode comprising an electrode conductor and a helical electrode comprising a series of turns which is secured to the catheter body near its distal end, wherein at least a portion of the circumference of the turns of the helical electrode portion is uncoated. Also disclosed is a process for ablating human tissue wherein a helical electrode secured to a catheter body near its distal end is utilized for an ablating procedure.

Abstract: A process for the treatment of ectopic atrial tachycardia by use of ablation and/or mapping procedures comprising ablating discrete locations within the right atrium of the heart by use of an ablation catheter and a precurved guiding introducer. Also disclosed is a shape for the guiding introducer to be used for the ablation and/or mapping of the discrete locations within the right atrium for the treatment of ectopic atrial tachycardia.

Abstract: A guiding introducer system for use in the right atrium comprised of an inner guiding introducer and an outer guiding introducer wherein the inner guiding introducer is comprised of a first and second section and the outer guiding introducer is comprised of a first, second and third section. The guiding introducer system is for use in sensing, pacing, and ablating procedures within the right atrium of the human heart.

Abstract: A process for the treatment of atrial arrhythmia by use of ablation and/or mapping procedures comprising ablating discrete ablation tracks within the left and right atrium of the heart by use of precurved left and right atrium guiding introducers. Also disclosed are shapes for the guiding introducers to be used for the ablation and/or mapping of the discrete tracks within the left and right atrium.

Abstract: A guiding introducer system for use in the left atrium comprised of an inner guiding introducer and an outer guiding introducer wherein the inner guiding introducer is comprised of a first and second section and the outer guiding introducer is comprised of a first and second sections. The guiding introducer system is for use in sensing, pacing, and ablating procedures within the left atrium of the human heart.

Abstract: A guiding introducer for in the left atrium comprised of a first, second and third section wherein the first section is a generally elongated straight section wherein merged with the distal end of the first section is a second section which is curved in a compound curve, first curving upward in a first longitudinal curve and simultaneously curving to the right in a second longitudinal curve, wherein the second section merges with the third section wherein said third section is a third longitudinal curve wherein the plane of the third section is angled upward at an angle of approximately 25 to about 60 degrees from the plane of the first section and wherein substantially all of the third section is coplanar.

Abstract: A guiding introducer for use in the right atrium comprised of a first, second and third section wherein the first section is a generally elongated straight section wherein merged with the distal end of the first section is a second section which is curved upward in a longitudinal curve wherein the distal end of the second section is merged with the third section. The guiding introducer is for use in sensing, pacing and ablating procedures in the right atrium of the human heart.