We have studied a new type of myocardial catheter ablation with photosensitization reaction to realize non-thermal
therapy for atrial arrhythmia, such as atrial fibrillation. Photochemically-generated reactive oxygen species may induce
myocardial electrophysiological damage without heat generation. In this study, to demonstrate photosensitization
reaction-induced myocardial electrical conduction block, the inferior vena cava to tricuspid annulus (IVC-TA) isthmus
linear ablation was conducted with photosensitization reaction in porcine heart in vivo, using a newly developed laser
catheter (7 Fr.). The end point of the procedure was the production of IVC-TA isthmus block under the
electrophysiological analysis by diagnostic catheter with 10-bipole electrodes placed in right atrium along the isthmus.
Talaporfin sodium (NPe6) as a photosensitizer was injected intravenously to pigs at 2.5-5.0 mg/kg. About 15 min after
the injection, the laser light at the wavelength of 663 nm with a catheter output power density of 40-60 W/cm2 in about
1.4 mm spot size was irradiated through the laser catheter point by point in line crossing the isthmus under the
fluoroscopic guidance. Before the photosensitization procedure, pacing signal from the distal electrodes of the diagnostic
catheter, propagated through the isthmus in order. During the irradiation, electrical potential at the irradiated area was
diminished. After the completion of the irradiation line, the bidirectional conduction block on the IVC-TA isthmus was
validated by pacing from the distal and proximal bipole. These results indicated that photosensitization reaction could
achieve the electrical conduction block of myocardial tissue immediately after the irradiation. We think that
photosensitization reaction could become a novel therapy for atrial arrhythmia.