what can i do to bring swollen feet and ankles down?

I work at an old folks home and i have a patient that is about 80 yes old.
His feet and ankles are constantly swollen …real swollen. It looks as if his ankles
were to explode. Poor guy! I.just need to know how i can help him to bring
down the swelling! What could i do for him? Have a pleasant day! God bless you!