My mom has congestive heart failure, pulmonary hypertension and Diabetes. She's been on diuretics her entire adult life. Over the past 8 years, whenever she got excessive fluid build-up and severe symptoms, the hospital would basically flush her out with heavy IV diuretics and she would be fine again.
However, she has been hospitalized for 3 weeks now, was on a ventilator for 3 of those days and had over a liter of fluid drained from her back.