Echocardiography Results - ejection fraction + heart disease

The results of my most recent echocardiography after aortic valve replacement indicated the following; Abnormal diastolic left ventricular function, Aortic insufficiency of the bioprosthetic valve, Mild tricuspid regurgitation, Left ventricular hypertrophy, Moderate hypokinese of the anterior septal wall, and an ejection fraction of 65% which I'm being told would indicate a much less sever condition. What does all this mean as far as heart disease and with a tissue aortic valve replacement in 2005 will the ejection fraction decrease with the age of the valve? Also I have been placed on Toprol XL 50mg., does this medication have any affect on the ejection fraction?