Sim, Chua Boon
(2020)
Comparison of the efficacy of intravenous oxycodone versus morphine on postoperative pain following orthopaedics surgery under general anaesthesia.
Masters thesis, Universiti Sains Malaysia.
Abstract
Background Acute, severe postoperative pain is common following orthopaedics
surgery and morphine is the commonest used intravenous opioid. The introduction of
intravenous (IV) oxycodone has replaced morphine as the first choice of opioid used in
postoperative pain management in some countries. The aim of this study is to assess the
efficacy of IV oxycodone versus morphine on postoperative pain following orthopaedics
surgery under general anaesthesia.
Methods Fifty-eight American Society of Anesthesiologists (ASA) physical status
I–II patients were randomly assigned to receive either 0.08 mg/kg IV oxycodone (Group
O, n = 29) or 0.08 mg/kg morphine (Group M, n = 29) at the starting of skin closure.
Postoperative pain was evaluated using a visual analogue scale (VAS) from at 0 min,
hourly till 6th hour postoperatively. The time to first rescue analgesia, requirement of the
first and second rescue analgesia and adverse effects were assessed.
Results Postoperative pain score did not differ significantly in Group O and Group
M from 0 min, hourly till 6th hour postoperatively (P > 0.950). There were no significant
differences in the time to first rescue analgesia (P = 0.721), requirement of first (P =
0.594) and second rescue analgesia (P = 0.517) and adverse effects in both groups.
Conclusion Intravenous oxycodone is equipotent to morphine in treating acute
postoperative pain following orthopaedics surgery, and it is not associated with an
increased risk of opioid related adverse events.
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