- P-wave inversions in lead I are never normal. Consider 3 common etiologies:
- Ectopic atrial rhythm - V1-V6 also reveal inverted P's from an abnormal depolarization site.
- Dextrocardia - V1-V6 show r-wave regression.
- Limb lead reversal - lead II shows a "flat line", repeat the EKG with a better tech.
- "Sinus tachycardia with 1° AV block"
- "Sinus tachycardia with short PR"
- * cannot find p-wave axis