Heart related issue LVEF25 percent.

Dear sir Actually my father is suffering from DM last 25 years.and currently last 5 years he suffered from ckd ,heart and COPD related issue.doctors told that lungs ,kidney working approx 30 percent.and his lvef is 25percent.last two years ago AICD machine has been installed in one hospital . currently his BP fluctuates Max time and his pulse rate up and down .and his condition is critical in this time.@Doctors told to me his heart is weak .so that this type of issue has been happened.so kindly suggest any medicine or any treatment so that my father has been recovered.and angiography has been done in last one year ago .no any blockadge found.so plsss suggest what can we do for this type of issue plssssssss.