Correlation of clinical information in the standard 12-lead ECG and in a corrected orthogonal 3-lead ECG.

Abstract The clinical information contained in the standard 12-lead ECG was compared with that in the corrected orthogonal 3-lead ECG, in 261 randomly selected patients who showed ECG abnormalities. In a first correlation , all electrical information of clinical significance in the 12 standard leads could not be recovered from the 3 orthogonal leads in 7.3 per cent of all cases. In a second correlation, orthogonal leads were resolved in order to obtain additional leads from directions comparable to those of standard records. This procedure led to good agreement in all cases except one with a questionable discrepancy. Since lead resolution merely represents a different type of display of the data of orthogonal leads, resolved records do not contain any new information not contained in the 3 basic leads. The conclusion, therefore, was that the informational content of 3 corrected orthogonal leads is comparable to that of the standard 12-lead ECG. Transformation of data, such as orthogonal lead resolution and/or vector loop display, appears to be necessary, however, to recover without appreciable loss the clinical information contained in the standard 12-lead electrocardiogram.

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