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P Mitrale

2

P mitrale [*]

• Classically associated with mitral stenosis
• Duration > 0.12 s
• Bifid contour
• Peak-to-peak duration > 0.04 s

Normal P waves

• Less than 0.25 mv (2.5 small squares) high
• Less than 0.12 s (3 small squares) duration
• Normally upright in leads I and II
• Inverted in lead aVR
• Best seen in leads II and V1

Negative P wave in lead I

• Transposition of right and left arm electrodes
• Dextrocardia
• Abnormal atrial rhythm