Ddx-of-dominant-R-wave-in-V1-or-V2

• Ventricular abnl:
  • RVH (RAD, RAA, deep S waves in I, V5, V6);
  • HCM;
  • Duchenne’s
• Posterior MI:
  • anterior R wave = posterior Q wave;
  • often with IMI
• Abnormal depolarization:
  • RBBB (QRS >120 msec, rSR′);
  • WPW (↓ PR, δ wave, ↑ QRS)
• Other:
  • dextroversion;
  • counterclockwise rotation;
  • lead misplacement;
  • nl variant