Alprostadil protects type 2 diabetes mellitus patients treated with metformin from contrast-induced nephropathy

Purpose Type 2 diabetes mellitus (T2DM) patients treated with metformin are predisposed to develop contrast-induced nephropathy (CIN) after received emergency contrast-enhanced computed tomography (CT) examination. We evaluated the protective effects of alprostadil on CIN in T2DM patients treated with metformin after contrast media (CM) administration. Methods In this single-institution, single-blind, superiority trial, we randomly assigned 451 T2DM patients taking metformin and underwent emergency contrast-enhanced CT examination to either the alprostadil group (227 patients) receiving alprostadil or the control group (224 patients) without alprostadil. All subjects stopped taking metformin and drank 500 ml water within 12 h after CM exposure. In addition, patients in the alprostadil group were injected with alprostadil (10 μg/day, for 3 days) plus 20 ml normal saline (alprostadil hydration) and the control group patients were daily injected with 20 ml normal saline as control for 3 days following CM administration. Serum creatinine (Scr) was measured before and <72 h after contrast-enhanced CT examination. CIN was defined as an increase in Scr ≥ 44.2 µmol/l (0.5 mg/dL) or >25% over baseline within 3 days of contrast administration. Results There was a lower incidence of CIN in patients underwent alprostadil hydration than drinking water monohydration after CM administration, who with either normal renal function or chronic kidney disease (baseline eGFR < 60 ml·min −1 ·1.73 m −2 ). Conclusions Alprostadil hydration was superior to drinking water monohydration regarding preventing CIN in T2DM patients treated with metformin after contrast-enhanced CT.