My Husband Had Quadruple Bypass Surgery In March Of 2015.

my husband had quadruple bypass surgery in march of 2015. Ejection fraction was 20% before surgery with enlargement of the left ventricle, thickening not thinning. Since surgery with diet exercise and specific supplements ejection fraction is now at 35 to 45% enlargement has been reduced, blood pressure is low normal without medication. How much improvement can we expect to see.