Spectral analysis of intracardiac electrograms to predict identification of radiofrequency ablation sites

A method of choosing suitable sites for catheter delivery of ablative energy comprising:

• providing a catheter/ablation structure that is positioned on a potential ablation site on a heart;
• receiving from the catheter/ablation structure one or more intercardiac electrograms recorded from the potential ablation site;
• performing Fast Fourier Transform (FFT) on the recorded one or more intercardiac electrograms so as to produce one or more spectral power distributions of the potential ablation site;
• displaying the one or more spectral power distributions so as to determine whether the potential ablation site exhibits necessary spectral properties for the delivery of the ablative energy;
• and
• providing the ablation energy to the potential ablation site once it has been determined that the potential ablation site exhibits the necessary spectral properties, the necessary spectral properties aid in determining if the potential ablation site is a ventricular tachycardia (VT) termination site having power distributions that are nearly unimodal or a slow pathway site for other reentrant tachycardia circuits in which the rapidly and slowly conducting limbs of the reentrant circuit lie in physical proximity to one another.