Biophysical and anatomical considerations for safe and efficacious catheter ablation of arrhythmias.

The development of catheter ablation techniques for therapy of cardiac arrhythmias continues to evolve. Although many patients have benefited from catheter ablation procedures, failure to ablate the arrhythmogenic substrate and complications from the pulse used in these procedures remain too frequent occurrences. The purpose of this review is to focus on these problems of inefficacy and safety with attention directed to the role various direct current and radiofrequency pulses have had in the genesis of these difficulties.