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.

The ECG findings presented as normal in athletes were established by an international consensus panel ... Ectopic P waves are most easily seen when the P waves are negative in the inferior leads (II, ...

The most common ECG finding in the setting of a pulmonary ... A large S wave in lead I, a Q wave in lead III and an inverted T wave in lead III together indicate acute right heart strain.