ECG RAE/LAE
LAE:
Wide >2.5 mm (100 msec) in lead II
P waves are biphasic in leads V1-2. If the second, negative phase of the P wave is >1.5 mm in depth, it indicates LAE.
In mitral valve disease: wide "double-humped" P wave >120 msec duration in lead II.
RAE:
P waves amplitude >2.5 or more in leads II, III
Peaked P wave morphology (P- pulmonale). Duration >10 msec
Sharply peaked biphasic P wave in lead V1 - V2 with initial deflection greater (>1.5) than the terminal deflection
Biatrial enlargement:
Combination of tall P waves in II, III, aVF with terminal negative V1.