Response to letter regarding article, 'Ischemic preconditioning for prevention of contrast medium-induced nephropathy: randomized Pilot RenPro-Trial (Renal Protection Trial)'

We thank the authors for their interest in our study on the impact of remote ischemic preconditioning on contrast medium–induced acute kidney injury (CI-AKI).1 The incidence of CI-AKI varies substantially among several studies because of the lack of a uniform definition of CI-AKI.2 Rates of CI-AKI may be as high as 50% or even higher, depending on the presence of risk factors such as chronic renal insufficiency and diabetes mellitus. Although the definition of CI-AKI varies across the trials, the most commonly used definition includes an absolute increase in serum creatinine of 0.5 mg/dL or a 25% relative increase in …