High-gain recordings of the Frank scalar atrial vectorcardiogram were obtained with conventional vectorcardiographic apparatus in 115 normal subjects. Forty measurements of time intervals, scalar voltages, and spatial voltages, which were expected to most likely reflect patterns of depolarization found in the experimental laboratory, were selected for analysis. The atrial vectorcardiogram was found to relate well to patterns of right and left atrial depolarization previously described in dogs. Right atrial activity was reflected in leftward, inferior, and anterior forces, while left atrial depolarization began later and was reflected in leftward, inferior, and more posterior forces. Normal values of selected parameters are presented. The study indicates that high-gain recordings of the scalar atrial vectorcardiogram can be easily obtained as a part of a routine vectorcardiographic procedure. Readily determined parameters reflect differential depolarization of the right atrium and of the left atrium.
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine