1. A device for assessing the condition of a mammalian heart, comprising: a lead comprising two sensors, a processor coupled to the lead, the processor configured to: (i) obtain a first signal from the lead, and compute a first waveform corresponding to the first signal, the first waveform being characterized by a plurality of QRS complexes and T waves; (ii) compute a plurality of first fiducial points associated with corresponding QRS complexes; (iii) compute a plurality of second fiducial points associated with corresponding T waves; (iv) compute a plurality of values of a T wave timing measure based on the differences in time between corresponding members of the first and second pluralities of fiducial points; (v) derive an average of the T wave timing measure based on the plurality of values of the T wave timing measure; (vi) apply a test to detect a pathological heart condition, wherein the test is based on the average of the T wave timing measure.