Radical renal surgery (laparoscopic and open) in octogenarians.

AIM: An ageing population is at significant risk of developing of renal cell carcinoma (RCC). We evaluate our units experience in managing RCC in octogenarians using either laparoscopic or open radical nephrectomy, highlighting the postoperative complication rates and survival outcomes. MATERIALS AND METHODS: From June 2001 to June 2008, 65 octogenarians underwent a radical nephrectomy for suspected renal cell carcinoma. The procedure was performed laparoscopically (group 1) in 29 patients (44%) and via an open nephrectomy (group 2) in 36 patients (56%). The presenting age, sex distribution, ASA score, preoperative co-morbidities and indications for nephrectomy were statically comparable in both groups. Postoperative complications were recorded using the Clavien-Dindo classification. RESULTS: Both groups were similar preoperatively with respect to age of presentation, ASA score and co-morbidities such as hypertension, ischemic heart disease, and chronic respiratory disease. Group 1 showed better statistically significant operative parameters (operative time and blood loss), mean length of hospital stay and most importantly postoperative complications. Postoperative complication rates were lower in group 1 (48.3%) when compared with group 2 (80.5%) (p<0.05). CONCLUSION: Surgery for renal cancer in patient over the age of 80 should only be considered after a thorough work up. Chronological age itself should not be the only determining factor. If such a surgery was to be undertaken, then in our experience, patients who underwent laparoscopic radial nephrectomy had fewer complications than those had open radical nephrectomy.

Are surrogate assumptions and use of diuretics associated with diagnosis and staging of acute kidney injury after cardiac surgery?

BACKGROUND AND OBJECTIVES: This study measured the association between the Acute Kidney Injury Network (AKIN) diagnostic and staging criteria and surrogates for baseline serum creatinine (SCr) and body weight, compared urine output (UO) with SCr criteria, and assessed the relationships between use of diuretics and calibration between criteria and prediction of outcomes. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: This was a retrospective cohort study using prospective measurements of SCr, hourly UO, body weight, and drug administration records from 5701 patients admitted, after cardiac surgery, to a cardiac intensive care unit between 1995 and 2006. RESULTS: More patients (n=2424, 42.5%) met SCr diagnostic criteria with calculated SCr assuming a baseline estimated GFR of 75 ml/min per 1.73 m(2) than with known baseline SCr (n=1043, 18.3%). Fewer patients (n=484, 8.5%) met UO diagnostic criteria with assumed body weight (70 kg) than with known weight (n=624, 10.9%). Agreement between SCr and UO criteria was fair (κ=0.28; 95% confidence interval 0.25-0.31). UO diagnostic criteria were specific (0.95; 0.94-0.95) but insensitive (0.36; 0.33-0.39) compared with SCr. Intravenous diuretics were associated with higher probability of falling below the UO diagnostic threshold compared with SCr, higher 30-day mortality (relative risk, 2.27; 1.08-4.76), and the need for renal support (4.35; 1.82-10.4) compared with no diuretics. CONCLUSIONS: Common surrogates for baseline estimated GFR and body weight were associated with misclassification of AKIN stage. UO criteria were insensitive compared with SCr. Intravenous diuretic use further reduced agreement and confounded association between AKIN stage and 30-day mortality or need for renal support.