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Table 1 Prevalence of Atrial Enlargement by CMR and ECG

From: Accuracy of electrocardiographic criteria for atrial enlargement: validation with cardiovascular magnetic resonance

LAE RAE
CMR Criteria
Volume index ≥ 55 ml/m 2 28% Volume index ≥ 55 ml/m 2 11%
ECG Criteria
Any ECG criteria for LAE 82% Any ECG criteria for RAE 5%
P > 0.11s 70% Inferior P waves > 2.5 mm 1%
P mitrale 3% Positive P wave in V1 > 1.5 mm 4%
P axis < 30° 9%   
NPTF-V1 > 0.04s·mm 16%   
PPTF-aVL > 0.5 mm 41%   
  1. CMR: Cardiovascular magnetic resonance. ECG: Electrocardiography. LAE: Left atrial enlargement. RAE: Right atrial enlargement. P mitrale: Notched P wave with interpeak duration > 0.04s. NPTF-V1 > 0.04s·mm: Area of negative P terminal force in lead V1 > 0.04s·mm. PPTF-aVL: Positive P terminal force in lead aVL. Inferior P waves: P wave in any of the leads II, III, or aVF.