The invention relates to a catheter useful in recording His electrogram alternans. The catheter includes a catheter probe containing at least one row of receiving poles positioned at an edge of the catheter probe, equidistantly spaced from each other. An apparatus useful in receiving an electrical signal from cardiac tissue, said apparatus comprising a catheter probe at one end and a flexible elongate member at the other end, wherein said catheter probe comprises a plurality of receiving poles positioned in a row at a first edge of said probe, said poles positioned equidistant from each other, wherein said catheter probe is from about 6 cm to about 10 cm in length, and from about 3 mm to about 5 mm in width or diameter, and said elongate member is capable of moving through a human blood vessel.
