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Right atrial enlargement

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Right atrial enlargement (P pulmonale)

• Tall P waves (>2.5 mm) in II, III, aVF
• Limited correlation with pathology
• Associated with
1. COPD
2. Pulmonary hypertension
3. Pulmonary stenosis
4. Tetralogy of Fallot
5. Tricuspid stenosis
6. Transiently in pulmonary embolism