LAUSR

BACKGROUND Acute kidney injury (AKI) and renal dysfunction after heart transplantation are common and serious complications. Atrial natriuretic peptide (ANP) has been shown to increase glomerular filtration rate (GFR) and exert renoprotective effects when used for prevention/treatment of AKI in cardiac surgery. We tested the hypothesis that intra- and postoperative administration of ANP could prevent a postoperative decrease in renal function early after heart transplantation. METHODS Seventy patients were randomized to receive either ANP (50 ng/kg/min) (n=33) or placebo (n=37) starting after induction of anesthesia and continued for 4 days after heart transplantation or until treatment with dialysis was started. The primary end-point of the present study was measured GFR (mGFR) at day 4, assessed by plasma clearance of a renal filtration marker. Also, the incidence of postoperative AKI and dialysis were assessed. RESULTS Median (IQR) mGFR at day 4 postoperatively was 60.0 (57.0) and 50.1 (36.3) ml/min/1.72 m2 for the placebo and ANP groups, respectively (p=0.705). During ongoing ANP infusion, the need for dialysis was 21.6% and 9.1% for the placebo and ANP groups, respectively (p=0.197). The incidences of AKI for the placebo and the ANP groups were 76.5% and 63.6%, respectively (p=0.616). The incidences of AKI stage 1 were 32.4% and 21.2% for the placebo and ANP groups, respectively (p=0.420) and for AKI stage 2 or 3, 37.8% and 42.4%, respectively (p=0.808). CONCLUSIONS The study failed to detect that ANP infusion attenuates renal dysfunction or decreases the incidence of AKI after heart transplantation.