title: Spatial magnitude of the normal QRS-complex in the electrocardiogram of rabbits. Velocity and acceleration of the spatial magnitude.
abstract: The article describes the curves of the spatial magnitude (SM) of the normal QRS-complex in 52 rabbits, as well as of the velocity and acceleration of SM as a function of time. The X-, Y- and Z-recordings after McFee and Parungao are subjected to analogue-to-digital conversion and computer-calculation. The SM-curve consists of two and less frequently of three peaks, the third peak having the greatest amplitude and the first peak--the smallest. The three peaks are discovered at 16, 41 and 64 per cent, respectively, of the duration of the QRS-complex. The results are discussed in relation to data about other mammals and humans. The characteristic points in the curves of the recorded parameters are compared.
mesh_terms: D000818:Animals; D016275:Atrial Function; D004562:Electrocardiography; D004594:Electrophysiology; D005260:Female; D006321:Heart / Q000502:physiology*; D008297:Male; D011817:Rabbits; D013997:Time Factors