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Abstract

Introduction. Intravenous administration of saline and non-ionic isosmolar contrast media significantly reduces the incidence of contrast-induced nephropathy, one of the most common causes of acute renal failure. Results with oral N -acetylcysteine are conflicting. The aim of our study was to evaluate the prophylactic role of N -acetylcysteine in patients with stable chronic renal failure undergoing coronary and/or peripheral angiography and/or angioplasty.

Methods. We randomized 200 elective, consecutive patients (mean age 74.9 ± 7.3 years; 65% male, 25% diabetics) with basal creatinine clearance ≤55 ml/min to receive oral N -acetylcysteine (600 mg bid the day before and the day of the procedure plus saline i.v. 0.9% 1 ml/kg/h 12–24 h before and 24 h after the procedure, n = 99) or placebo and saline at the same time intervals, n = 101. The contrast medium was non-ionic isosmolar (Iodixanol, Visipaque Amersham Health). Contrast-induced nephropathy was defined as an increase in serum creatinine >0.5 mg/dl or >25% within 3 days after the procedure. Serum creatinine was measured at baseline, 24, 48 and 72 h after the procedure.

Results. Contrast-induced nephropathy was 8/99 (8.1%) in the N -acetylcysteine group versus 6/101 (5.9%) in the placebo group, P = 0.6. No difference was noted in high-risk subgroups such as diabetics (4/25 versus 2/25 P = 0.4) and those with serum creatinine clearance <42.3 ml/min (5/54 versus 4/48; P = 0.9).

Conclusion. In our experience, N -acetylcysteine did not prevent contrast-induced nephropathy in patients receiving isosmolar (iodixanol) contrast media and adequate hydration.

acute renal failure, contrast nephropathy, isosmolar contrast media, N -acetylcysteine , renal replacement therapy
© Oxford University Press 2009
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CLINICAL NEPHROLOGY
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