For the article by Eisenach in the July 1999 issue of ANESTHESIOLOGY (1999; 91:299–302), the author would like to make the following correction:

In the third paragraph of the article, the sentence beginning on the eighth line should read, “Sufentanil is approximately five times more potent than fentanyl for spinal or epidural analgesia, and the most commonly used doses are 5–10 μg sufentanil or 20–35 μg fentanyl.”