My mom worked in a doctor's office, and a hospital before that, and she always watched all the medical shows on TV. Some things she explained to us, but like Grivusangel, it's nice to get a detailed explanation of a term you hear a lot on those shows.
Several years ago, we had a customer collapse in the office, and of course, we called the EMTs. They had to use a defibrillator because he went into v-fib. He made it to the hospital, thank goodness, but it was sure enough scary, hoping the EMTs would be able to shock his heart back into rhythm.