Does anyone know what the difference is in editions 6 and 8 of the Lewis and Heitkemper Medical Surgical Book? I am taking a class that is using the 8th edition and I do not want to buy it because I have the sixth edition. Do you think I'll have any problems following along with reading assignments? My husband does not want me to buy the new book because he thinks it is a gimmick by the book company to sell more books. How updated is the new edition and in what areas? Any info would be appreciated. Thanks. I start my course Feb. 5th so please respond ASAP and let me know if you think I should shell out the 53.85 for a new book or the old one will do just fine. Thanks.