EXPRESSION OF NORMAL VENTRICULAR REPOLARIZATION IN BODY-SURFACE DISTRIBUTION OF T-POTENTIALS

Isopotential maps from 120 normal humans were obtained from 192 simultanously recorded ECG leads. Maps were plotted at 1 ms intervals during the QRS and 5 ms intervals during the ST-T deflection. Repetition of QRS features was evident during all but the 1st feq msec of the initial half of serial T maps. This suggests similarities of the normal sequence of ventricular excitation and recovery. Such similarities were demonstrated by direct studies but are not evident from the ECG examinations. Serial maps during later portions of the T wave showed decreasing intensity of potentials with little change of body surface locations. This also correlates with an established feature of ventricular repolarization, mamely that potential difference boundaries with stable locations are widely distributed during part of that process. Fingins suggest isopotential maps show features of ventricular recovery not apparent from less extensive examinations.