Hello and welcome to HCM. As an Urologist,i must reiterate, what your doctor has already told you. As a patient with kidney failure,waiting for a dialysis, Bumex is avoided,as it definitely can precipitate the kidney failure complications. If you want to see longer in better health,coax her to stop smoking, achieve good control of diabetes,and with maintainence dialysis,she should have a better quality of life. Her CHF will be checked by cardiologist with E,C,G,kidney functions,electrolytes,sugar,and kidney scan will be done by nephrologist. If you ve any doubts,you may contact me directly. Dr.Matthew J. Mangat.