Use of nonionic low-osmolar rather than ionic high-osmolar contrast media has reduced the risk of contrast-induced nephropathy. Will nonionic iso-osmolar media further lessen this risk?

• 使用非离子型低渗而非离子型高渗造影剂已经减少了造影剂肾病的风险。非离子型等渗造影剂是否进一步减低这种风险？