非离子型造影剂优于离子型造影剂是无可争议的。在静脉DSA时以及动态CT扫描时通常需要多次注射造影剂。低渗透性非离子型造影剂比离子型造影剂具有更好的耐受性,这一点在CT应用中已得到证实。本文用双盲法研究,在第二次给药时其耐受性如何,以及二次给药后副作用发生率是否上升。方法 1984年4月与10月之间,采用随机抽样选择100例病人进行双盲研究试验。观察病人在第二次注射造影剂后的副作用发生率与严 Non-ionic contrast agent is superior to ionic contrast agent is indisputable. Multiple injections of contrast media are often required at venous DSA and dynamic CT scans. Low-permeability non-ionic contrast agents have better tolerance than ionic contrast agents, which has been demonstrated in CT applications. In this paper, a double-blind study was conducted on the tolerability of the second dose and the incidence of side effects after the second dose. Methods Between April and October 1984, 100 patients were selected for randomized double-blind study. Observation of patients in the second injection of contrast agent after the incidence of side effects and strict