RT Journal Article SR Electronic T1 Systematic oral hydration with water is similar to parenteral hydration for prevention of contrast-induced nephropathy: an updated meta-analysis of randomised clinical data JF Open Heart JO Open Heart FD British Cardiovascular Society SP e000317 DO 10.1136/openhrt-2015-000317 VO 2 IS 1 A1 Shiv Kumar Agarwal A1 Sameh Mohareb A1 Achint Patel A1 Rabi Yacoub A1 James J DiNicolantonio A1 Ioannis Konstantinidis A1 Ambarish Pathak A1 Shailesh Fnu A1 Narender Annapureddy A1 Priya K Simoes A1 Sunil Kamat A1 Georges El-Hayek A1 Ravi Prasad A1 Damodar Kumbala A1 Rhanderson M Nascimento A1 John P Reilly A1 Girish N Nadkarni A1 Alexandre M Benjo YR 2015 UL http://openheart.bmj.com/content/2/1/e000317.abstract AB Background Contrast-induced nephropathy (CIN) is the third most common cause of hospital-acquired kidney injury and is related to increased long-term morbidity and mortality. Adequate intravenous (IV) hydration has been demonstrated to lessen its occurrence. Oral (PO) hydration with water is inexpensive and readily available but its role for CIN prevention is yet to be determined.Methods PubMed, EMBASE and the Cochrane Central register of controlled trials (CENTRAL) databases were searched until April 2015 and studies were selected using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist. All randomised clinical trials with head-to-head comparison between PO and IV hydration were included.Results A total of 5 studies with 477 patients were included in the analysis, 255 of those receiving PO water. The incidence of CIN was statistically similar in the IV and PO arms (7.7% and 8.2%, respectively; relative risk 0.97; 95% CI 0.36 to 2.94; p=0.95). The incidence of CIN was statistically similar in the IV and PO arms in patients with chronic kidney disease and with normal renal function. Rise in creatinine at 48–72 h was lower in the PO hydration group compared with IV hydration (pooled standard mean difference 0.04; 95% CI 0.03 to 0.06; p<0.001; I2=62%).Conclusions Our meta-analysis shows that systematic PO hydration with water is at least as effective as IV hydration with saline to prevent CIN. PO hydration is cheaper and more easily administered than IV hydration, thus making it more attractive and just as effective.