title: My doctor says I have a calcium build-up in my aortic valve and that the only solution is surgery to replace it.  How serious is calcium in the valve, and are there any alternatives to valve replacement?  Also, what should I expect after the surgery (my doctor has said the replacement would be a pig valve)?
mesh_terms: D001024:Aortic Valve Stenosis / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D002114:Calcinosis / Q000150:complications / Q000175:diagnosis / Q000601:surgery*; D002118:Calcium / Q000378:metabolism; D017023:Coronary Angiography; D007722:Health Knowledge, Attitudes, Practice; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D010353:Patient Education as Topic / Q000379:methods*; D010808:Physical Examination; D012307:Risk Factors
chemical_list: D002118:Calcium