Therefore, the criteria for diagnosing LAE on a 12-lead ECG is as follows: The length of the P wave in lead II is greater than 120 milliseconds OR The downward deflection of the P wave in lead V1 ...
When looking at a 12-lead ECG, a few logistics must be understood ... In general, when measuring amplitudes of waves or complexes, the units are expressed in mm, and when measuring lengths ...