In reply to Anonymous' comment above: Lasix is used to remove all excess fluids and not only fluid in lungs or around the heart. If her potassium is already at a 1.8 I am surprised they are choosing Lasix and not a potassium-sparing diuretic. Also, ask for a potassium supplement, because low potassium is also counter-productive for the heart's efficiency. The blood pressure is pretty low, and fluid balance is critical to proper kidney function as well as blood pressure. I wish you the best of luck.