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Trial record 23 of 74 for:    Codeine AND Acetaminophen

Adjuvant Analgesic Effects of Low Dose Tramadol/Acetaminophen Combination After Open Gynaecological Surgery

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00942565
Recruitment Status : Completed
First Posted : July 21, 2009
Last Update Posted : February 1, 2013
Information provided by (Responsible Party):
Cheung Chi Wai, The University of Hong Kong

Tracking Information
First Submitted Date  ICMJE July 20, 2009
First Posted Date  ICMJE July 21, 2009
Last Update Posted Date February 1, 2013
Study Start Date  ICMJE April 2007
Actual Primary Completion Date October 2008   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures  ICMJE
 (submitted: January 31, 2013)
Pain score [ Time Frame: Postoperative 48 hours ]
Original Primary Outcome Measures  ICMJE Not Provided
Change History Complete list of historical versions of study NCT00942565 on Archive Site
Current Secondary Outcome Measures  ICMJE
 (submitted: January 31, 2013)
postoperative morphine consumption, side effect, recovery, sleeping quality, satisfaction [ Time Frame: Postoperative 48 hours ]
Original Secondary Outcome Measures  ICMJE Not Provided
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title  ICMJE Adjuvant Analgesic Effects of Low Dose Tramadol/Acetaminophen Combination After Open Gynaecological Surgery
Official Title  ICMJE Not Provided
Brief Summary

Patient experience moderate to severe pain after abdominal surgery. This post-operative pain can also contribute to complications such as respiratory impairment, cardiovascular events, ileus, sleep deprivation and mood disturbance. Opioid based patient-controlled analgesia (PCA) is commonly employed but opioids have the side effects such as respiratory depression, nausea and vomiting, sedation, pruritus and urinary retention. Bowel motility can also be affected. Consequently alternative or adjunct analgesic medications without these side-effects have been investigated in order to reduce opioid consumption.

Multimodal analgesia is a technique whereby a combination of analgesic drugs with different modes of action can be used to improve analgesia and decrease adverse effects by virtue of synergism. Postoperatively, with adjunctive analgesia, PCA morphine consumption as well as the side effects may be reduced. Non-steroidal anti-inflammatory drugs (NSAIDs) have been shown to be opioid sparing and decrease the adverse effects of PCA morphine. A recent review showed that acetaminophen combined with PCA could induce a significant opioid-sparing effect but the incidence of PCA morphine related side effects were not reduced.

It is common nowadays to give oral analgesic supplements to post-operative patients on PCA morphine. Tramadol, an analogue of codeine, is one of the choices. However, some of the patients cannot tolerate the side effects such as nausea, drowsiness, sweating, postural hypotension and dry mouth. Combination of tramadol 37.5 mg and acetaminophen 375 mg, which has been used successfully to treat post-operative pain, may improve analgesic response with better tolerability.

This study is to assess tramadol 37.5 mg and acetaminophen 375 mg combination on the efficacy of pain control, down stepping of morphine consumption and related adverse events with PCA use after open colorectal surgeries.


This study aims to compare and evaluate:

  • The efficacy of tramadol/acetaminophen combination on postoperative pain relief after lower abdominal surgeries
  • The effects of tramadol/acetaminophen combination on the consumption and the duration of PCA morphine use
  • The adverse effects related to this regimen
  • The effects on postoperative bowel function, tolerability of fluid and diet, ambulatory function, sleep, and duration of hospital stay
  • The overall satisfaction of the patients
Detailed Description

This is a randomized, double-blinded, placebo-controlled study.

Study site Patients will be recruited and studied at Queen Mary Hospital, Hong Kong.

Anaesthesia for operation No premedication will be prescribed. Patients will be induced with fentanyl 1 to1.5µg/kg, thiopentone 2-4mg/kg or propofol 2-3mg/kg and rocuronium 1mg/kg. Anaesthesia will be maintained with cisatracurium and isoflurane with air and oxygen. Intravenous morphine will be used for pain relief intraoperatively.

Postoperative PCA settings

After the operation, at the recovery area, patients will be given boluses of intravenous morphine until satisfactory pain control, i.e. numerical rating scale (NRS) less than 4. PCA machine will then be connected and patient will learn the technique of using PCA. The PCA pump will be programmed as follow:

Each bolus: 1 to 1.5mg Lockout interval: 5 minutes Maximum hourly dose limit: 0.1mg/kg for patients up to 65 years old and 0.075mg/kg for patients over 65 No background morphine infusion will be given. Intramuscular pethidine 0.5mg/kg four-hourly will be prescribed as rescue pain medications. Patients will be assessed everyday by the pain team of the hospital.

Randomisation and blinding

Patients will be randomised to one of the following 2 groups:

Group T: Tramadol 37.5mg / acetaminophen 325mg: 1 tablet 3 times daily orally Group P: Acetaminophen 500mg 3 times daily A computer-generated random sequence will decide the allocation order. The appearance of acetaminophen looks similar to the tramadol/acetaminophen combination. Both pain team members and patients will be blinded to the study medications. The study medications will be used for 48 hours after operation.

Follow-up and assessments Patients will be assessed each morning by the pain team. The daily average pain score at rest and during cough will be recorded in numerical rating scale (NRS). Average daily pain intensity (0=none, 1=mild, 2=moderate, 3=severe) and average daily relief (4=complete relief, 3=a lot, 2=moderate, 1=slight, 0=no, -1=worse pain) will be assessed. The tries/good ratio shown on PCA machine and the total amount of morphine used, daily rescue pain drug consumption will be charted. The adverse effects (nausea, vomiting, pruritus, dizziness, and others) will be recorded with their frequencies and severity graded. Sedation will be assessed based on the scale shown.

The ambulatory function, tolerability of fluid and diet and bowel function will also be assessed. Sleeping quality will be evaluated using NRS and reason for it asked.

The PCA machine will be off if the NRS pain score on cough is less than 4. Patients will then grade their overall satisfaction of pain relief at postoperative day 3.

Data Collection


  • Resting and coughing NRS pain scores,
  • Average daily pain intensity and average daily relief
  • Tries/good ratio, cumulative morphine consumption,
  • Rescue pain drug consumption every day until 2 days after stopping PCA
  • Overall patient's satisfaction using NRS


− Adverse effects and their severity, sedation, ambulatory function, tolerability of fluid and diet, bowel function, and sleeping quality every day until off PCA


  • Age
  • Sex
  • Body weight
  • ASA grading
  • Operation duration
  • Intraoperative opioids
  • Morphine consumption at recovery room
Study Type  ICMJE Interventional
Study Phase  ICMJE Phase 4
Study Design  ICMJE Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Condition  ICMJE Postoperative Pain
Intervention  ICMJE
  • Drug: tramadol/acetaminophen
  • Drug: acetaminophen
Study Arms  ICMJE
  • Active Comparator: Tramadol/acetaminophen
    The tramadol and acetaminophen combination was given to patients at the same day after surgery.
    Intervention: Drug: tramadol/acetaminophen
  • Active Comparator: acetaminophen
    Acetaminophen was used as active control.
    Intervention: Drug: acetaminophen
Publications * Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status  ICMJE Completed
Actual Enrollment  ICMJE
 (submitted: January 31, 2013)
Original Enrollment  ICMJE Not Provided
Actual Study Completion Date  ICMJE December 2012
Actual Primary Completion Date October 2008   (Final data collection date for primary outcome measure)
Eligibility Criteria  ICMJE

Inclusion Criteria:

  • ASA I to III
  • Age 18 to 80 years
  • Scheduled for elective lower abdominal surgery (gynecological or colorectal surgery) at Queen Mary Hospital, Hong Kong

Exclusion Criteria:

  • Allergy to tramadol, acetaminophen, or other opioid drugs
  • Patient with epilepsy or history of seizures
  • Concurrent use of selective serotonin uptake inhibitors, tricyclic antidepressants, or monoamine oxidase inhibitors
  • Impaired or retarded mental state
  • Impaired renal function, defined as preoperative serum creatinine level over 120µmol/L
  • Impaired hepatic function, defined as preoperative serum albumin level less than 30g/L
  • Intraoperative use of clonidine or dexmedetomidine
  • Patient requiring postoperative mechanical ventilation
  • Difficulties in using patient-controlled analgesia
  • Pregnancy
  • Current or previous drug abuser
  • Alcoholism
  • Patient refusal
Sex/Gender  ICMJE
Sexes Eligible for Study: Female
Ages  ICMJE 18 Years to 80 Years   (Adult, Older Adult)
Accepts Healthy Volunteers  ICMJE No
Contacts  ICMJE Contact information is only displayed when the study is recruiting subjects
Listed Location Countries  ICMJE Hong Kong
Removed Location Countries  
Administrative Information
NCT Number  ICMJE NCT00942565
Other Study ID Numbers  ICMJE UW 06-188 T/1213
Has Data Monitoring Committee Not Provided
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement  ICMJE Not Provided
Responsible Party Cheung Chi Wai, The University of Hong Kong
Study Sponsor  ICMJE The University of Hong Kong
Collaborators  ICMJE Not Provided
Investigators  ICMJE Not Provided
PRS Account The University of Hong Kong
Verification Date January 2013

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP