Pathologic-Q-waves

Q wave, Q

Definition

• ≥30 msec (≥20 msec V2–V3) or >25% height of R wave in that QRS complex

• Small (septal) q waves in I, aVL, V5 & V6 are nl, as can be isolated Qw in III, aVR, V1

• “Pseudoinfarct” pattern may be seen in LBBB, infiltrative dis., HCM, COPD, PTX, WPW