Granmother died of mi in 1980's in her late 50's early 60's. if she had an aortic dissection would mi still be stated as cause or would it be specific?

Cause of death: In many cases, a death certification or other determination of cause of death is a best guess. For example, if a patient had chest pain followed by sudden death at home, and there was not diagnostic testing or autopsy, myocardial infarction might be the likely & assumed COD. But pulmonary embolism or aortic dissection or a malignant arrhythmia might present with a similar history.