Intravenous morphine and oxycodone for pain after abdominal surgery

Area of Science:

• Anesthesiology
• Pharmacology
• Surgical Care

Background:

• Postoperative pain management is crucial for patient recovery.
• Opioid analgesics are commonly used for moderate to severe pain.
• Morphine and oxycodone are frequently prescribed intravenous opioids.

Purpose of the Study:

• To compare the efficacy and safety of intravenous oxycodone versus morphine for pain control after major abdominal surgery.
• To evaluate the dosage requirements, onset, and duration of analgesia for both opioids.
• To assess side effects such as sedation and hemodynamic changes.

Main Methods:

• A double-blind study involving 39 patients undergoing major abdominal surgery.
• Intravenous administration of morphine or oxycodone at 0.05 mg/kg.
• Patient-controlled analgesia with a 5-minute dosing interval until pain relief was achieved.
• Assessment of pain relief, analgesic consumption, onset and duration of effect, sedation, and mean arterial blood pressure.

Main Results:

• Lower total doses of oxycodone (21.8 mg) were needed compared to morphine (34.2 mg) over 2 hours.
• Oxycodone achieved the first state of pain relief faster (28 min vs. 46 min) and it lasted longer (39 min vs. 27 min).
• Morphine induced greater sedation and a more significant decrease in mean arterial blood pressure than oxycodone.

Conclusions:

• Intravenous oxycodone offers advantages over morphine in postoperative pain management following major abdominal surgery.
• Oxycodone demonstrates improved efficacy, faster onset, longer duration of action, and a potentially better safety profile regarding sedation and hemodynamics.
• These findings suggest oxycodone may be a preferred option for acute pain management in this patient population.