I am just looking for a few examples of "the prevalence of cardiac disorders in our society".
http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=5tr&q=prevalence+cardiac+disorders+in+USA&btnG=Search
Many articles to read here.
If you need help learning how to search, including how to choose good search terms, go here and scroll down to the links under HOW TO SEARCH THE INTERNET:
http://hanlib.sou.edu/searchtools/
=)