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Heart Valves
Although your heart has four valves, the valves open and close two at a time.
http://www.guidant.com/condition/heart/heart_valves.shtml
FDA Heart Health Online - Prosthetic Heart Valve
A prosthetic (artificial) heart valve is a replacement for a diseased heart valve. http://www.fda.gov/hearthealth/treatments/medicaldevices/prostheticheartvalve.html
Heart Valve Replacement
What to expect before Heart Valve Replacement, complications & risks, what to expect during, what to expect after, frequently asked questions.
http://www.sjm.com/procedures/procedure.aspx?name=Heart+Valve+Replacement