• Q wave is Pathological in III, aVF
• Not deep enough in II
• Non-pathological in I, V5, V6 (L-sided)

Definition

• Q wave:
  • Duration: 1 mm (40 ms)
  • Amplitude: 25-30% of the R wave, or < 2 mm
• Pathological Q wave

  • Deep: > 25-30% of R wave, or > 2 mm

  • Wide: > 1 mm (40 ms)

  • Continuous: more than 2 regional leads