Figure 6 - uploaded by Mario Jorge Mc Loughlin
Content may be subject to copyright.
Healthy control. a. Standard V1 ECG tracing; b. Standard V6 ECG tracing; c. Polar coordinates. V1 wave peaks are printed in blue numbers and V6 in red numbers. It is clearly seen that P wave develops its positive and negative portion in V1 before its peak in V6. Although the difference between the peak of the "q" in V6 and that of the "r" in V1 is only 3 ms, the clock allows detecting the difference. The intrinsicoid def lection starts at 272 ms in V1 and 299 ms in V6 (27 ms difference), reflecting the time it takes to depolarization to reach V6. On the other hand, the peak of the T wave is seen in V6 11ms earlier than in V1.
Source publication
Electrical activity of the heart can be presented using different methods, and the standard is ECG, in which the changes in electric amplitude in one axis are written on paper that moves at a known velocity. Vectorcardiography uses Cartesian (rectangular) coordinates and plots points defined by the simultaneous values in the x and y axes. In this p...
Contexts in source publication
Context 1
... expected, when displaying the progression of intrinsicoid deflection in the precordial leads, the "clock" shows the delay in the arrival of the stimulus to the left electrodes. Figure 6 shows the superposition in time and amplitude of V1 and V6 in a healthy control. Intrinsicoid deflection starts at 272 ms in V1 and 299 ms in V6 (27 ms difference), but the peak of the T wave in V6 precedes in 11 ms the peak of T in V1, reflecting repolarization vectors. ...
Context 2
... these differences could be suspected in the conventional ECG, they are much easier to appreciate in the clock, and even minimal delays can be detected ( Figure 6) It is important to keep in mind that, in order to clarify the differences, in Figure 6, only two precordial leads were plotted. It is possible to superimpose more leads and comparisons can be made between several derivations ( Figure 8) or all of them (Figures 4 and 5). ...
Context 3
... these differences could be suspected in the conventional ECG, they are much easier to appreciate in the clock, and even minimal delays can be detected ( Figure 6) It is important to keep in mind that, in order to clarify the differences, in Figure 6, only two precordial leads were plotted. It is possible to superimpose more leads and comparisons can be made between several derivations ( Figure 8) or all of them (Figures 4 and 5). ...
