alexa Brief report: perioperative analgesic efficacy and plasma concentrations of S+ -ketamine in continuous epidural infusion during thoracic surgery.
Chemistry

Chemistry

Journal of Physical Chemistry & Biophysics

Author(s): Feltracco P, Barbieri S, Rizzi S, Ori C, Groppa F,

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Abstract BACKGROUND: In our study, we evaluated the analgesic effect and plasma level time course of subanesthetic doses of intraoperative S(+)-ketamine administered by continuous epidural infusion for postthoracotomic pain. METHODS: A study population of 140 patients undergoing thoracic surgery was randomly assigned to either S(+)-ketamine or ropivacaine by continuous epidural infusion. The outcome measures were as follows: (a) intraoperative fentanyl requirements; (b) postoperative pain intensity; and (c) postoperative rescue analgesics. RESULTS: Intraoperative fentanyl consumption was significantly lower (median of difference: -58.6 μg; 95\% confidence interval [CI], -97.2 to -19.6 μg; P = 0.0032) in patients in the ketamine group than those in the ropivacaine group. Postoperative visual analog scale scores were significantly lower in the ketamine group than in controls (Wilcoxon-Mann-Whitney odds at 24 hours = 6.25; 95\% CI, 4.07 to 1.97; P < 0.0001). Rescue analgesics were required more frequently in controls than in the ketamine group (percentage difference: 58.6\%; 95\% CI, 43.3\% to 69.6\%; P < 0.0001). The mean plasma level of ketamine declined rapidly during continuous epidural infusion and decayed slowly after it had stopped. CONCLUSIONS: Our data show that epidural infusion of subanesthetic doses of S(+)-ketamine during thoracic surgery provides better postoperative analgesia than epidural ropivacaine. This article was published in Anesth Analg and referenced in Journal of Physical Chemistry & Biophysics

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