网页www.ecgwaves.com | Learn ECG Interpretation Online ♥ P-wave amplitude should be ≤2,5 mm (all leads). PR interval must be 0,12–0,22 s (all leads). ♥ P mitrale: increased P-wave duration, enhanced second hump in lead II and enhanced negative deflection in V1. ♥ P pulmonale: increased P-wave amplitudes in lead II and V1.