Criteria for right atrial enlargement on ECG
Criteria for right atrial enlargement on ECG:
- Tall sharp P waves in lead II measuring 0.25 mV (2.5 mm) or more
- Sharp initial deflection of P wave in V1 of 0.1 mV (1 mm) or more
- Sharp intrinsicoid deflection of P wave (atrial intrinsicoid deflection) is suggestive of right atrial enlargement even in the presence of a prominent negative deflection in V1 (pseudo left atrial enlargement pattern, often seen in atrial septal defect)