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The most characteristic findings of QRS waves of the spatial velocity ECG in atrial septal defect are that the velocity increased markedly after the initiation of the terminal delay. The peak velocity in the terminal delay and the velocities at the beginning portions of the terminal delay showed positive correlations with pulmonary artery and right ventricular pressures. Mean values of the pulmonary artery and the right ventricular pressures were significantly higher in the group with higher peak velocity in the terminal delay than in the group with lower peak velocity in the terminal delay. The durations of the terminal delays showed significant negative correlations with the pulmonary artery and the right ventricular pressures. Using only 2 parameters concerning the terminal delay of QRS waves of the spatial velocity ECG, namely the peak velocity in the terminal delay and the duration of terminal delay, 93% of the normal subjects, 100% of the usual type of the complete right bundle branch block and 95% of atrial septal defect were differentiated each other.

QRS Waves of the Spatial Velocity Electrocardiogram in Atrial Septal Defect