II and III. The six precordial leads are called leads V1, V2, V3, V4, V5 and V6. Below is a normal 12-lead ECG tracing. The different parts of the ECG will be described in the following sections.

If lead II is downward (negative), then the axis is ... Note that the first three account for almost 90% of ECG tracings with LAD. If the QRS is predominantly negative in lead I and positive ...

[Dániel Buga], for instance, designed a compact ECG system the size of a credit card, cleverly dubbed Card/IO, that clearly demonstrates how to implement a single-lead ECG. Although obviously not ...