Criteria - both of the following:
(1) absence of counterclockwise rotation in the frontal plane
(2) one or both of the following:
(2a) Q wave >= 30 msec in lead II
(2b) regression of initial inferior forces from lead III to lead II
where:
• Regression of the initial forces from lead III to lead II is indicated by the initial portion of the QRS complex in lead II is more negative than the initial portion of the QRS complex in lead III.
• Regression of the initial forces from lead III to lead II may show one of the following:
(1) a taller initial R wave in lead III than the initial R wave in lead II
(2) an initial R wave in lead III and an isoelectric segment in lead II
(3) an initial isoelectric point in lead III and a Q wave in lead II
(4) a Q wave in lead II that is deeper than a Q wave in lead III
