I got recommended this book because at the time I knew nothing about EKGs. It's an easy to read book (sometimes repetitive) that's helpful at pounding info into your head. I ended up using it the most concurrently as a student taking a EKG/cardiac class. It wasn't very indepth in the mechanisms or physiology but it does the job it sets out to do: 'interpreting EKGs' which I believe I am able to do more proficiently thanks to this book. Also it's got nice glossy pages with helpful pictures that take up half the page on every page and it makes it more fun to read than normal class books.