CI've had a cough, shortness of breath and swelling in my legs and ankles. I'm doing in center hemodialysis. I had an appt with the lung doctor but he couldn't identify why I'm having these problems. My doctor did a BNP and it was 1,843 so now I have an appt with the cardiologist and an echocardiogram scheduled. I was doing fine until a week ago Saturday when this popped up out of nowhere. Is it possible to get CHF so unexpectedly?