A device for measuring parameters of human tissue includes a multielectrode catheter for taking multiple measurements of the electrical characteristics of the human tissue, a concentric tube catheter located inside the multielectrode catheter, for providing structural support to the multi-electrode catheter and for serving as a conduit for advancing or withdrawing the multielectrode catheter over its surface; and an imaging catheter located inside the concentric tube catheter for taking multiple measurements of anatomical characteristics of the human tissue.