[Significance of a differentially amplified ECG in the diagnosis of paroxysmal tachycardias].

For differentiation of tachycardias the authors offer a method of recording the curves of differentially increased spike potentials (DISP) of atriae from the surface of the chest wall, based on the recording of the electrical activity of the atriae in the shape of a high amplitude atrial spike complex. The DISP curves have been recorded in 36 patients with tachycardias, in whom by usual ECG it was difficult to determine the tachycardia type, in some cases it was impossible, for instance in confluence of the P wave with the QRS complex or the T wave. The typical and constant form of the atrial spike complex on the DISP curve in the sinus rhythm permits determining the sequence of the stimulations of atriae and the type of disorders of the cardiac rhythm. The recording of the DISP of atriae as to complexity does not differ from the recording of the usual ECG.