heart attack vs myocardial infarct

heart attack

noun
  • An acute myocardial infarction, sometimes fatal, caused by the sudden occurrence of coronary thrombosis, which obstructs the blood supply to the heart and leads to necrosis of heart muscle tissue. 

  • Death or failure. 

myocardial infarct

noun
  • Synonym of myocardial infarction 

How often have the words heart attack and myocardial infarct occurred in a corpus of books? (source: Google Ngram Viewer )