A 25-year-old woman has been suffering from diabetes mellitus since she was 9 years of old. She was admitted into the nephrology unit with significant edemas of the face, upper and lower extremities. Blood pressure — 200/110 mmHg. In the laboratory analysis of the blood: Hb — 90 g/L, blood creatinine — 850mcmol/L, urine proteins — 1.0 g/L, leukocytes — 10-15 in the vision field. Glomerular filtration rate — 10 mL/min. What tactics should the doctor choose?