Intraoperative Change in Urine Color: Be Cautious for a Clinical Entity!

A change in urine color is an unusual intraoperative occurrence, which can be distressing for the anesthesia provider. Abnormal changes in color are generally benign effects of medications and foods; however, a change in urine color may be a sign of an underlying pathologic condition. Methylene blue, a nonpathogenic, water-soluble, commonly used dye for diagnostic tests, has on rare occasions, been reported to discolor urine green intraoperatively or postoperatively. We report on a patient who produced green discoloration of urine intraoperatively after methylene blue administration, which was benign and resolved spontaneously.

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Déclaration de conflit d'intérêts

The authors have declared no financial relationships with any commercial entity related to the content of this article. The authors did not discuss off-label use within the article.