Morphine vs. Oxycodone for Postoperative Pain Management | NCT00528177

NCT00528177

Protocol Section

Identification Module

Results Section

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No data is available for this block.

Annotation Section

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Document Section

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Derived Section

Miscellaneous Info Module

Status Module

Name	Class
University of Oslo	OTHER

Oversight Module

Description Module

Detailed Description

Traditionally, a 1:1 ratio in analgesic potency between intravenous morphine and oxycodone has been presumed (1-2), but one study demonstrated a 3:2 ratio between those drugs (3). During the last years, several studies indicate that oxycodone has the potential of mediating pain relief through the kappa-opioid receptor (4-6), and not only on the my-opioid receptor like most other opioids used in the clinic. Kappa-opioid receptors are widely distributed in visceral organs, and this may explain why Kalso (3) found less need for oxycodone compared to morphine in patients undergoing abdominal surgery.

The aim of this study is to investigate whether patients with visceral postoperative pain need less oxycodone compared to morphine, and whether patients receiving oxycodone experience better pain relief and less adverse effects compared to patients receiving morphine.

Before start of surgery, the patients will be tested with PainMatcher, an instrument testing electrical pain threshold in the skin (7-10), to ensure that both groups have the same pain threshold before surgery.

References

Kalso E. Oxycodone. Journal of Pain & Symptom Management 2005; 29: S47-S56.
Silvasti M, Rosenberg P, Seppala T, Svartling N, Pitkanen M. Comparison of analgesic efficacy of oxycodone and morphine in postoperative intravenous patient-controlled analgesia. Acta Anaesthesiol Scand 1998; 42: 576-80.
Kalso E, Poyhia R, Onnela P, Linko K, Tigerstedt I, Tammisto T. Intravenous morphine and oxycodone for pain after abdominal surgery. Acta Anaesthesiol Scand 1991; 35: 642-6.
Staahl C, Christrup LL, Andersen SD, Arendt-Nielsen L, Drewes AM. A comparative study of oxycodone and morphine in a multi-modal, tissue-differentiated experimental pain model. Pain 2006; 123: 28-36.
Ross FB, Smith MT. The intrinsic antinociceptive effects of oxycodone appear to be kappa-opioid receptor mediated. Pain 1997; 73: 151-7.
Sandner-Kiesling A, Pan HL, Chen SR, James RL, Haven-Hudkins DL, Dewan DM, Eisenach JC. Effect of kappa opioid agonists on visceral nociception induced by uterine cervical distension in rats. Pain 2002; 96: 13-22.
Alstergren P, Forstrom J, Alstergren P, Forstrom J. Acute oral pain intensity and pain threshold assessed by intensity matching to pain induced by electrical stimuli. Journal of Orofacial Pain 2003; 17: 151-9.
Lundeberg T, Lund I, Dahlin L, Borg E, Gustafsson C, Sandin L, Rosen A, Kowalski J, Eriksson SV. Reliability and responsiveness of three different pain assessments. Journal of Rehabilitation Medicine 2001; 33: 279-83.
Nielsen PR. Prediction of post-operative pain by an electrical pain stimulus. Acta Anaesthesiol Scand 2007; 51: 582-6.
Stener-Victorin E, Kowalski J, Lundeberg T. A new highly reliable instrument for the assessment of pre- and postoperative gynecological pain. Anesth & Analg 95: 151-7.

Design Module

Interventional Study Design

Biospecimen

No data available

No data is available for this block.

Arms/Interventions Module

Arm Groups

Label	Type	Description	Intervention Names
O	Active Comparator	This arm will receive intravenous oxycodone at the end of surgery and PCA oxycodone for postoperative pain relief.	Drug: Morphine and oxycodone
M	Active Comparator	This arm will receive intravenous morphine at the end of surgery and PCA morphine for postoperative pain relief.	Drug: Morphine and oxycodone

Interventions

Name	Type	Description	Arm Group Labels	Other Names
Morphine and oxycodone	Drug	At the end of surgery, group 1 will receive intravenous morphine 0.07 mg/kg and intravenous PCA morphine 0.015 mg/kg every time they push the botton with 5 minutes lock-out interval. Maximum 16 mg/2 hours. Group 2 will receive intravenous oxycodone 0.07 mg/kg and intravenous PCA oxycodone 0.015 mg/kg every time they push the botton with 5 minutes lock-out interval. Maximum 16 mg/2 hours. The patients will use the PCA until the next morning.

Outcomes Module

Measure	Description	Time Frame
Dosage relation between oxycodone and morphine. Pain score (VAS). Adverse effects.		Within the first postoperative day (24 hours).

Eligibility Module

Contacts/Locations Module

Name	Affiliation	Role
Johan Ræder, Prof.MD,Phd	Ullevaal University Hospital	Study Director

Facility	Status	City	State	ZIP	Country	Contacts
Ullevaal University Hospital		Oslo	Oslo	0407	Norway

References Module

Citations

PubMed Identifier	Type	Citation	Retractions
19762758	Derived	Lenz H, Sandvik L, Qvigstad E, Bjerkelund CE, Raeder J. A comparison of intravenous oxycodone and intravenous morphine in patient-controlled postoperative analgesia after laparoscopic hysterectomy. Anesth Analg. 2009 Oct;109(4):1279-83. doi: 10.1213/ane.0b013e3181b0f0bb.

Condition Browse Module

ID	Term
D009214	Myoma
D010149	Pain, Postoperative

ID	Term
D009379	Neoplasms, Muscle Tissue
D018204	Neoplasms, Connective and Soft Tissue
D009370	Neoplasms by Histologic Type
D009369	Neoplasms

Intervention Browse Module