If you use google scholar as your search engine you can search for medical studies using whatever parameters you choose You may then look at the hits. Some will only be links to a brief summary as the whole article will be hidden behind a paywall. Other times you can read the whole study. You will find the answer to the risk vs benefit of prophylactic antibiotics in those studies much more likely than on this forum.
For articles on use in heart surgery since 2011 you will get results such as this
prophylactic antibiotics heart surgery - Google Scholar