Note the R/S ratio in V1 is quite high. Now, here is the same patient with a posterior ECG tracing. Leads V7 to V9 were added. Leads V1 and V2 were moved a bit just to confuse us. There is not ...

Below is a normal 12-lead ECG tracing. The different parts of the ECG will be described in the following sections. A normal ECG contains waves, intervals, segments and one complex, as defined below.

Part of a tracing, using the standard lead, throat to abdomen, is shown in Fig. 1. While the general form of the electrocardiogram is similar to that of the normal human heart (Fig. 2), except ...

As noted above, the precordial leads are unreliable ... Of course, such an approach requires more than a single ECG tracing. Incorporation of these ideas in one's "routine" is not cumbersome ...