The criteria for inferior infarct are Q waves in the inferior leads of 0.04 sec. or greater. But the computer algorithm accepts any size Q wave. Small q waves are often present normally; so “inferior infarcts” are over diagnosed. Notice the word “possible”. Most likely, the interpretation is from an EKG machine algorithm.
https://www.reference.com/world-view/possible-inferior-infarct-age-undetermined-mean-ekg-2ff4d3fa3c0df8f6
What is Anteroseptal infarct age undetermined? If the finding on an ECG is “septal infarct, age undetermined,” it means that the patient possibly had a heart attack at an undetermined time in the past.
https://www.reference.com/world-view/possible-inferior-infarct-age-undetermined-mean-ekg-2ff4d3fa3c0df8f6
Similarly, it is asked, what does an infarct mean on an ECG? An inferior infarct on ECG (inferior myocardial infarction or inferior STEMI) occurs when inferior myocardial tissue supplied by the right coronary artery (RCA), is injured due to thrombosis of that vessel.
https://www.rampfesthudson.com/what-is-probable-inferior-infarct/
This discussion is related to Definitrion of interior infarct. An inferior infarction is usually caused by an occlusion of the right coronary artery and commonly involves the inferior wall of the left ventricle. It can also be called a "diaphragmatic infarct" because the inferior aspect of the heart sits on top of the diaphragm.
https://www.reference.com/world-view/possible-inferior-infarct-age-undetermined-mean-ekg-2ff4d3fa3c0df8f6
pdf for "evaluation of possible inferior infarct age undetermined".(Page 1 of about 18 results)