Ronkar,
Sorry to hear of your father's problems.
The most important thing that you could do for your father is make sure that he is seen at a center with experts in dealing with heart, aorta, and kidney disease. Several university centers throughtout the country would fit that bill: Duke, Emory, or Vanderbilt in the South; Cleveland Clinic or Mayo Clinic in the Midwest, Harvard hospitals in the Northeast are all example centers.
The treatment options that are available for him will depend on a multitude of factors. Be sure to take paper records and films with you wherever you decide to go.
Good luck.