Greetings! Thank you for your question and welcome to HCM. I understand your concern. Indeed, stress can trigger changes in the heart muscle and coronary arteries. Now, if this heart attacks you mentioned, were treated with stents and stents are doing good, there is a slight chance that he will suffer another heart attack just from receiving a bad news. Stress is a risk factor as added factor to main factors, but it is known that can cause significant spasms to all the arteries in the human body. Until now, my opinion and recommendation is that, knowing him, you should be able to find the easiest way to not generate stress to him. Although, I remain in my opinion that there is only a slight chance that stress can produce a new acute myocardial infarction. It would also be very helpful if you had provided more information and insight about the three heart attacks that he suffered. It is only the hormones that are flushed in the system during an acute stress episode that can produce coronary artery spasms. I hope this has been of help. My regards, Dr. Meriton