The Optimal Concentration of Ropivacaine in Combination with Butorphanol 50micro gram/ml for Patient-Controlled Epidural Analgesia.
Dong Hee Kim
Korean J Anesthesiol. 2002;43(6):749-754.     DOI: https://doi.org/10.4097/kjae.2002.43.6.749
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Stability of an epidural analgesic admixture containing butorphanol tartrate and ropivacaine hydrochloride
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