my girlfriend has congestive heart failure,they put in 2 stints, but she still has fluid in her lungs,and feet. better but still there. was comming home today, but doc said no still fluid. what can you do to help get rid of the fluid.they say its lack of potassium. her heart should produce 60 percent output they say, but now is only at 35. will she be ok, and will the heart muscle improve over time?