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Effect of Higher Doses of Remifentanil on Postoperative Pain in Patients Undergoing Thyroidectomy

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified January 2013 by Ru-Ping Dai, Central South University.
Recruitment status was:  Recruiting
Information provided by (Responsible Party):
Ru-Ping Dai, Central South University Identifier:
First received: December 30, 2012
Last updated: January 3, 2013
Last verified: January 2013
Extensive clinical studies have shown that intraoperative infusion high dose of remifentanil (0.2ug/kg/min) induced postoperative hyperalgesia. Recent experimental study however suggests that higher dose of remifentanil may attenuate postoperative hyperalgesia. Thus, the present study is designed as a "proof of principle" study and hypothesizes that higher dose of remifentanil may reduce postoperative pain in patients.

Condition Intervention Phase
Nodular Goiter Drug: Remifentanil Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Comparison of Different Doses of Remifentanil on Postoperative Pain in Patients Undergoing Thyroidectomy: a Prospective, Double-blinded Randomized Control Trial

Resource links provided by NLM:

Further study details as provided by Ru-Ping Dai, Central South University:

Primary Outcome Measures:
  • Changes of sensory threshold from baseline to postoperative 24hours [ Time Frame: 24 hour ]
    Quantitative sensory threshold in the remote uninjured site (here, the inner forearm) is commonly used to examine the occurrence of postoperative hyperalgesia. The present study will examine the mechanical threshold in two different doses of remifentanil to determine whether high dose of remifentanil induces hyperalgesia

Secondary Outcome Measures:
  • visual analogue score (VAS) [ Time Frame: 24 hours ]
    VAS is widely used to assess postoperative pain. It will be divided as 10 points. Zero refers to no pain and ten refers to extremely pain. Based on this way, we can know the difference of postoperative pain in these two different groups.

Other Outcome Measures:
  • consumption of morphine postoperatively [ Time Frame: 24 hours ]

Estimated Enrollment: 60
Study Start Date: December 2012
Estimated Primary Completion Date: March 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Remifentanil (Low dose)
remifentanil(Low):dose of 0.2ug/kg/min. The dose of remifentanil is widely used intraoperatively clinically;
Drug: Remifentanil
The present study examine two different dose of remifentanil: low dose (0.2ug/kg/min) and high dose (1.2ug/kg/min)
Experimental: Remifentanil (High dose)
The high dose of remifentanil is 1.2ug/kg/min. The does is sometimes used in clinical practice.
Drug: Remifentanil
The present study examine two different dose of remifentanil: low dose (0.2ug/kg/min) and high dose (1.2ug/kg/min)

Detailed Description:

Remifentanil, an ultra-short acting opioid, is widely used in the patients undergoing surgery. However, extensive studies report that remifentanil,administered at 0.2ug/kg/min or 0.4ug/kg/min intraoperatively, can result in postoperative hyperalgesia and increase the consumption of analgesics when compared with low dose (0.05ug/kg/min). However, a recent experimental study shows that large dose of remifentanil can inhibit pain hypersensitivity through erasing the spinal sensitization of pain. The present study thus hypothesizes that higher dose of remifentanil (1.2ug/kg/min) may attenuate postoperative pain. The present study will compare the effect of two different dose of remifentanil (0.2ug/kg/min and 1.2ug/kg/min) on postoperative pain. Patients undergoing thyroidectomy will be recruited, and mechanical threshold will be measured in the remote region of surgical site preoperatively. The patients will be randomly divided by two groups, 0.2ug/kg/min (group I) and 1.2ug/kg/min (group II). After operation, mechanical threshold and visual analogue scale (VAS) will be measured as the indicators of postoperative pain. The consumption of morphine will also be compared between these two doses of remifentanil.

The present study may find optimized dose of opioid usage in the patients undergoing surgery to relieve the postoperative pain.


Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • ASA Grade I or II
  • Age 18-60 years old
  • BMI<35,

Exclusion Criteria:

  • do not consent,
  • Chronic pain,
  • used pain killer,
  • undergoing operation previously
  • diabetes or the other diseases affecting the sensory.
  • difficult intubation;
  • unexpected surgical complication such as bleeding;
  • psychiatric disorders;
  • drug or alchohol abuse
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01761149

Contact: Ru-Ping Dai, MD, PhD 86-731-8529 ext 5970

China, Hunan
Department of Anesthesiology, The Second Xiangya Hospital Recruiting
Changsha, Hunan, China, 410011
Contact: Yan-Ling Zhang, MD    86-731-8529 ext 5970   
Sponsors and Collaborators
Central South University
Principal Investigator: Ru-Ping Dai, MD Central South University
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Ru-Ping Dai, Associate Professor, MD, PhD, Central South University Identifier: NCT01761149     History of Changes
Other Study ID Numbers: XYEYYCT2013001
Study First Received: December 30, 2012
Last Updated: January 3, 2013

Keywords provided by Ru-Ping Dai, Central South University:
visual analogue score

Additional relevant MeSH terms:
Pain, Postoperative
Goiter, Nodular
Neurologic Manifestations
Nervous System Diseases
Postoperative Complications
Pathologic Processes
Signs and Symptoms
Thyroid Diseases
Endocrine System Diseases
Analgesics, Opioid
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Hypnotics and Sedatives
Anesthetics, Intravenous
Anesthetics, General
Anesthetics processed this record on September 20, 2017