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Preemptive analgesia. Clinical evidence of neuroplasticity contributing to postoperative pain.

Preemptive analgesia. Clinical evidence of neuroplasticity contributing to postoperative pain.

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Title: Preemptive analgesia. Clinical evidence of neuroplasticity contributing to postoperative pain.
Author: Katz, J.
Kavanagh, B.P.
Sandler, A.N.
Nierenberg, H.
Boylan, J.F.
Friedlander, M.
Shaw, B.F.
Abstract: Recent evidence suggests that surgical incision and other noxious perioperative events may induce prolonged changes in central neural function that later contribute to postoperative pain. The present study tested the hypothesis that patients receiving epidural fentanyl before incision would have less pain and need fewer analgesics post-operatively than patients receiving the same dose of epidural fentanyl after incision. Thirty patients (ASA physical status 2) scheduled for elective thoracic surgery through a posterolateral thoracotomy incision were randomized to one of two groups of equal size and prospectively studied in a double-blind manner. Epidural catheters were placed via the L2-L3 or L3-L4 interspaces preoperatively, and the position was confirmed with lidocaine. Group 1 received epidural fentanyl (4 micrograms/kg, in 20 ml normal saline) before surgical incision, followed by epidural normal saline (20 ml) infused 15 min after incision. Group 2 received epidural normal saline (20 ml) before surgical incision, followed by epidural fentanyl (4 micrograms/kg, in 20 ml normal saline) infused 15 min after incision. No additional analgesics were used before or during the operation. Anesthesia was induced with thiopental (3-5 mg/kg) and maintained with N2O/O2 and isoflurane. Paralysis was achieved with pancuronium (0.1 mg/kg). Postoperative analgesia consisted of patient-controlled intravenous morphine. Visual analogue scale pain scores were significantly less in group 1 (2.6 +/- 0.44) than in group 2 (4.7 +/- 0.58) 6 h after surgery (P less than 0.05), by which time plasma fentanyl concentrations had decreased to subtherapeutic levels (less than 0.15 ng/ml) in both groups.
Subject: Randomized Controlled Trial
Fentanyl/blood
Middle Aged
Female
Male
Humans
Thoracotomy/adverse effects
Prospective Studies
Clinical Trial
Pain, Postoperative/etiology
Pain, Postoperative/drug therapy
Morphine/administration & dosage
Fentanyl/administration & dosage
Double-Blind Method
Anesthesia, General
Analgesia, Patient-Controlled
Analgesia, Epidural
Type: Article
Rights: Final published version available at: http://journals.lww.com/anesthesiology/Abstract/1992/09000/Preemptive_Analgesia_Clinical_Evidence_of.6.aspx
URI: http://hdl.handle.net/10315/6209
Published: Lippincott, Williams & Wilkins
Citation: Anesthesiology. 1992 Sep;77(3):439-46.
ISSN: 0003-3022
Date: 1992-09

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