[Acute kidney injury in cancer patients]

Acute kidney injury is a common and serious complication of cancer. We analyzed medical records of 335 cancer patients who were treated in Internal Diseases and Nephrology Department with Dialysis Center at St. Lucas Hospital in Tarnow in years 2009 and 2010. AKI was diagnosed according to the RIFLE classification in 91 cases (43 woman and 48 men). The average age was 68.7 years (from 18 to 93 years). 54 patients were classified as category F, 23 as category I and 14 as category R of the RIFLE classification. 60.4% of the patients were diagnosed with metastatic cancer, 12.1% with a regionally developed disease, 18.7% with cancer limited to one organ and in 8.8% the stage of the disease could not be established. The highest incidence of AKI was observed in patients with cancer of the cervix, ovary, prostate, breast, stomach and of unknown primary site. The most common risk factor of AKI was hypovolemia diagnosed in 35% of cases. Obstruction of the urinary tract, the second most frequent risk factor was observed in 26% of cases. 14.5% of the patients required hemodialysis. In the group of dialysed patients 38.5% of them died, 61.5% were discharged from hospital after improvement of renal function. In the group of non-dialysed patients mortality rate was 25.6%; survivors in that group presented improvement in renal function. Evaluation of the renal function in patients with cancer is essential.