Nonspecific st-t wave changes do not indicate a heart attack. These changes are often dismissed by doctors, and there is no further investigation, despite the fact that their could be a pulmonary embolism or cardiac problem.
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Non-specific ST wave changes on a ECG mean that there is an irregularity, but the it isn't easily identifiable as pertaining to a specific cause which has a known appearance. Further testing is needed to determine the cause of the irregularity.