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P Wave
- Normal findings
- Upright: I, II, avF, V4, V5, V6
- Inverted: aVR
- Variable: III, avL, V1, V2, V3
- P Wave Inversion (other than aVR)
- Ectopic atrial focus
- AV nodal rhythm
- High Amplitude: Atrial hypertrophy or atrial dilatation
- Mitral valve or tricuspid valve disease
- Hypertension
- Cor Pulmonale
- Congenital Heart Disease
- Wide P Wave (over .11 sec)
- Left atrial enlargement
- Biphasic P Wave (second half negative in III or V1)
- Left Atrial Enlargement
- M shaped or notched P Wave
- M-Mitral: Left atrial enlargement
- Findings
- Over 0.04 seconds between peaks
- Taller in I than in III
- Peaked P Wave
- P-Pulmonale: Right atrial enlargement
- Findings
- Tall and pointed
- Taller in Lead III than in I
- P Waves absent
- Sinoatrial node block
- AV Nodal rhythm
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