heart attack vs myocardial infarction

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 infarction

noun
  • Necrosis of heart muscle caused by an interruption to the supply of blood to the heart, often as a result of coronary thrombosis. 

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