A 40-year-old man has been suffering from chronic glomerulonephritis for 10 years. Complains of vomiting, muscle cramps in the lower extremities. AT - 180/120 mm Hg. Art., creatinine in serum - 770 μmol/l, glomerular filtration rate - 5 ml/min. For the last two days, diuresis decreased to 400 ml per day. What treatment tactics are indicated for this patient?