The blood draining organs with a high histamine content was sampled and elevation of plasma histamine was found to result from injections of certain contrast media. All methylglucamine contrast media tested to date (acetrizoate, diatrizoate, and iodipamide) produced such elevations. Methylglucamine chloride also caused elevation of plasma histamine. Some “allergic” reactions to contrast media may be explained on this basis.
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Lasser et al. (1971) studied this question.