Abnormal Q wave 2025-10-29T07:00:50Z Pathological Q wave Physiologically, the Q wave is mainly observed in the lateral leads aVL, I, V5, and V6 and is not observed in leads V1 to V3. The Q wave points downward and has a width less than 0.03s (i.e., 1 small square) and a depth of less than 3 mm (3 small squares), and it does not exceed 1/4 of the R wave in the given lead. The development of pathological Q waves has long been correlated with worsened outcome in patients with ST elevation myocardial infarction An anomaly of the Q wave of the electrocardiogram. Abnormal QRS complex