I had his heart checked and found that he had myocardial infarction, and he was treated with balloon angioplasty. He got much better after that, but he still felt tight in his chest after dinner. However, this time if he got up to walk, the tightness would go away, which means that it was not a sign of myocardial infarction. I tested his heart again, and like I suspected, nothing was wrong.