just had my echo all good both mech valve seated well no regurg but i noticed my mitral valve gradient is 8mmhg they dont seem bothered my surgery was complicated as it was my 4th with a root enlargement on the aortic, it was my 2nd hit of endocarditis - anyway just was curious what the average norm was ..i have ats aortic 23 -was a 25 but had to reduce due to infection and st judes standard mitral 29mm surgeon said it was a tight fit the 3rd op when he originally did the root enlargment and fitted the 25mm aotic- but then he had to replace the mitral on the forth opp as well....