[Noninvasive locational diagnosis of concealed accessory pathways in the heart]

Concealed accessory pathways in the heart can be located by noninvasively mapping the left and right atrial potentials. The quantitative diagnostic criteria for locating the septal pathway are (1) the retrograde depolarization time difference between the two atria (delta A) = 0ms, (2) (delta A) less than 30 ms, (3) the change rate of delta A(delta A%) greater than 50%, (4) delta A index less than 10 and (5) the ratio of ventriculoatrial conduction time in the left to that in the right heart less than 1.2. These criteria have a diagnostic sensitivity of 100%, specificity of 87.5% and accuracy of 94.4%.