A comparison of Epidural Butorphanol and Tramadol for Postoperative Analgesia Using CSEA Technique.

J Anaesthesiol Clin Pharmacol · 2011 · PMC3141111 · PMID 21804703

Europe PMC

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highly significantp<0.001actually significant

The mean VAS score between the groups was highly significant (p<0.001) at 0.5, 1, 1.5, 2 hrs; significant (p<0.05) from 4 to 8 hours and at 12, 24 hours it was insignificant statistically (p>0.05) ( Fig I ).

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