Mayo Clinic offers award-winning medical and health information and tools for healthy living.

The eMedicine point-of-care clinical reference features up-to-date, searchable, peer-reviewed medical articles organized in specialty-focused textbooks, and is continuously updated with practice-changing evidence culled daily from the medical literature.

cardiologychannel is your source for heart and circulation information and connecting with others, including angina, heart attack, cholestorol, blood pressure, pacemaker, and more. Find a cardiologist, share your story, watch videos, and more.

Special Heart Valve Surgery Book About Heart Valve Replacement, Heart Valve Repair, Leaking Heart Valve Symptoms, Ross Procedure, Aortic Valve Replacement, Mitral Valve Prolapse, Aortic Stenosis, Mitral Valve Replacement

UpToDate is an evidence based, peer reviewed information resource, available via the Web and Mobile Devices. Our community includes over 4,400 leading physicians, peer reviewers, editors and over 385,000 users. UpToDate includes access to over 8,300 topics in 14 specialties

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world's largest medical library. It collects materials in all major areas of the health sciences and to a lesser degree in such areas as chemistry, physics, botany and zoology. The collections stand at 5 million items--books, journals, technical reports, manuscripts, microfilms, photographs and images. Housed within the Library is one of the world's finest medical history collections of old (pre-1914) and rare medical texts, manuscripts, and incunabula.

Homepage of Merck.com, Merck's corporate Web site