Ionic iodinated contrast medium and amobarbital sodium mixtures: potential for precipitation.

Monsein, L H; Miller, T J; Kuwahara, S K; Sostre, S; Debrun, G M · Radiology · 1992

basic_science · Level V

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Abstract

When a small amount of diatrizoate meglumine, an ionic iodinated contrast medium, is left in a catheter system before injection of amobarbital sodium or when the contrast medium is intentionally mixed with amobarbital sodium, a potentially dangerous situation occurs. The authors showed in vitro that a dense precipitate forms in this situation. This is due to an acid-base reaction between the relatively acidic contrast medium and basic barbiturate and the subsequent formation of insoluble amobarbital.

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