Hi friend,
Welcome to Health Care Magic
These changes are often a normal variant / especially in certain race; or gender - eg. women.
However, it may also be due to reduced blood supply to the mid-portion of the heart.
Electrical interference, muscle movements can cause artefacts.
Repeat the ECG / Do blood tests (cardiac markers) and/or
ECHOcardiogram.
If all are well, one is re-assured. Any suspicion needs further investigation.
Take care
Wishing speedy recovery
God bless
Good luck