when does t wave inversion occur in mi
The abnormality lasts for a very short time, and then elevation of the ST segment occurs. This is the hallmark abnormality of an acute MI. It occurs when the heart muscle is being injured by a lack of blood flow and oxygen and is also called a current of injury. This is followed by T wave inversions. Over time, when the heart muscle cells actually die, these abnormalities are replaced with Q waves. However, not everyone with an MI has an abnormal EKG. In fact the initial EKG may not show ST elevation in up to 40% of patients having an MI.