we have compared the results of 435 aortic valve replacements using the starr- edwards valve ( se-avr ) , 515 mitral valve replacements ( se-mvr ) , and 121 double-valve replacements ( se-avrmvr ) with 251 aortic valve replacements using the xenograft aortic valve ( x-avr ) , 338 mitral valve replacements ( x-mvr ) , and 88 double-valve replacements ( x-avr-mvr ) .
C0003506
aortic valve replacements
C0003501
x-avr