Mean Electric Axis in Cats
1978 Volume 11 Issue 11 Pages 26-31
Details
1978 Volume 11 Issue 11 Pages 26-31
A study was carried out to clarify the distribution of the P, QRS and T electric axes in cats. In it, electrocardiograms were recorded by means of needle electrodes from 11 adult cats lying on the right side under nembutal anesthesia. The mean electric axes were calculated for Einthoven's triangle on the horizontal and sagittal plane. On the two planes, vectorcardiograms were recorded with a transient-memory apparatus and an XY recorder. The results obtained are summarized as follows.
1) The mean P, QRS and T electric axes on the horizontal plane formed an angle of 72.4, 81.4 and 63.6 degrees with the reference line to induce a mean voltage of 0.094, 0.415 and 0.121 mV, respectively.
2) The mean P, QRS and T electric axes on the sagittal plane formed an angle of 37.3, 41.7 and 43.9 degrees with the reference line to induce a mean voltage of 0.086, 0.575 and 0.187 mV, respectively.
3) The mean electric axes were in good agreement with the vectorcardiograms.
4) The mean QRS electric axis on the sagittal plane corresponded more or less to the direction of the anatomical cardiac axis.
