What does it mean to have reciprocal changes in ecg

Can anyone please explain what does it mean to have reciprocal changes in ecg

What leads do one have to look for?

U know that Usually we don’t put chest leads posteriorly

Suppose there is a posterior wall MI , we will see the changes in the anterior chest leads but in the opposite directions ( vectors play role)

These are the reciprocal changes that we see on the anterior chest leads when the pathology is on the posterior side

Reciprocal ST Segment depression is basically a typical ECG finding frequently going with STEMI. The ST depression may point to ischemia in a myocardial area other than the zone of infarction or may represent just a benign electrical phenomenon.