Table 4

ECG Changes Associated With Prior Myocardial Infarction

Any Q wave in leads V2–V3 ≥0.02 sec or QS complex in leads V2 and Vr
Q wave ≥0.03 sec and ≥0.1 mV deep or QS complex in leads 1, II, aVL, aVF or V4–V6 in any two leads of a contiguous lead grouping (1, aVL; V1–V6; II, III, aVF).a
R wave ≥0.04 sec in V1–V2 and R/S ≥1 with a concordant positive T wave in absence of conduction defect.
  • a The same criteria are used for supplemental leads V7–V9.