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fMRI Measurements on Pain Relief Methods in First Stage Labor Pain (TENS)

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 October 2008 by Chang Gung Memorial Hospital.
Recruitment status was:  Recruiting
ClinicalTrials.gov Identifier:
First Posted: October 7, 2008
Last Update Posted: October 7, 2008
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.
Information provided by:
Chang Gung Memorial Hospital
The purposes of this study is to integrate the objective tests into the subjective test, visual analog score (VAS), for evaluation and further understanding of relieving labor pain by TENS application on acupuncture points in the first stage of labor.

Labor Pain Pain Relief Magnetic Resonance Imaging

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: fMRI Measurements on the Effect of Transcutaneous Electrical Nerve Stimulation (TENS) on Acupuncture Points Verses Spontaneous Normal Vaginal Delivery to Relief of Labor Pain

Further study details as provided by Chang Gung Memorial Hospital:

Estimated Enrollment: 60
Study Start Date: March 2008
Estimated Study Completion Date: December 2010
Estimated Primary Completion Date: July 2008 (Final data collection date for primary outcome measure)
Healthy term pregnant women in labor without any pain relief
Healthy term pregnant women received TENS
Healthy term pregnant women received epidural anesthesia

Detailed Description:

Our published paper "Pain relief by applying transcutaneous electrical nerve stimulation (TENS) on acupuncture points during the first stage of labor: a randomized double-blind placebo-controlled trial. (Pain 2007; 127:214-20 )" about the double-blind randomized placebo-controlled study, sponsored by NSC 91-2314-B-182A-162-grant in 2002, showed that TENS application on acupuncture points resulted in significantly better pain relief than placebo by visual analogue scale (VAS) score in the first stage of labor. Two hurdles that hampered physicians to evaluate the possible therapies in the management of obstetric pain. Firstly, there is no objective test for pain. Secondly, lack of controlled trials for different analgesic methods of pain treatment (interventional, psychological, physical therapy).

Transcutaneous electrical nerve stimulation (TENS) is one of the non-pharmacological means of pain relief for labor and delivery. We aimed to investigate the efficacy and safety of TENS on specific acupuncture points for reducing pain in the first stage of labor. In this double-blind, placebo-controlled trial, we randomly assigned healthy full-term parturients in active phase of first-stage labor to either TENS on 4 acupuncture points (Hegu [Li 4] and Sanyinjiao [Sp 6].

Visual analogue scale (VAS) will be used as an adjunct objective assessment of pain relief efficacy by having a scale with a range from 1 to 10, where 1 represented no pain and 10 the most painful. Participants will be asked by study personnel to estimate how painful during the last contractions before the application of TENS, 30 minutes and 60 minutes after TENS application. VAS will be recorded at each application (first, second application, and so forth) as described till the end of first stage. Within 24 hours after delivery, the women will be asked to fill in a questionnaire regarding the satisfaction of pain relief using TENS during labor. Augmentation of labor will be administered to achieve three uterine contractions in 10 minutes in the first stage according to the protocol of induction of labor. Continuous external electronic fetal heart rate monitoring and tocodynamometry are used for fetal surveillance. Polygraph recording of maternal heart rate, transcutaneous oxygen tension, respiratory rate will be used for evaluate the changes. Details of the effect of analgesia in participants switching to it, the progression of cervical dilation and the length of first stage after the application of TENS are recorded. The request for epidural anesthesia or other form of analgesia will be available upon request. Adverse events such as discomfort of movement restriction, skin allergy, or electrical accident were recorded if any. Decision of performing operative delivery was made only according to maternal and fetal indications. fMRI A scan will be collected in between 30-60 minutes after the application TENS. Subjects will be asked to lie supine on the scanner bed and motion artifact will be excluded. MR imaging parameters: Functional scans using 3.0-Tesla Siemens Allegra MRI System equipped for echo-planar imaging. Blood oxygenation level-dependent (BOLD) functional imaging will be carried out using a gradient echo T2-weighted pulse sequence. At least 38 sagittal slices, 3 mm thick with 0.6-mm gap will be performed in each scan. Image collection was preceded by four dummy scans to allow for equilibration of the MRI signal. A3D MPRAGE T1-weighted high-resolution structure dataset was collected before functional imaging to facilitate Talairach transformation and visualization.


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Ages Eligible for Study:   20 Years to 40 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
primary care clinic

Inclusion Criteria:

  • an initial wish to deliver without epidural analgesia
  • primigravida
  • planned vaginal childbirth without obstetrical or non-obstetrical complications
  • fetal vertex presentation
  • term pregnancy (>37 weeks of gestation)
  • age between 20 and 40 years
  • no experience in acupuncture or TENS for other reasons
  • no previous poor obstetrical outcome (either maternal or fetal). For those subjects willing to have fMRI: This study will be carried out only on right-handed Chinese women under accompany by a family member.

Exclusion Criteria:

  • psychiatric and neurologic disorders,
  • candidate for vaginal birth after cesarean (VBAC); and
  • head trauma with loss of conscious,
  • major medical illness e.g., pacemaker parturient.
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00768014

AS Chao Recruiting
Gueishan, Tao-Yuan, Taiwan, 333
Contact: An-Shine Chao, MD    03-3281200 ext 8258    aschao1295@cgmh.org.tw   
Sponsors and Collaborators
Chang Gung Memorial Hospital
Principal Investigator: An-Shine Chao, MD Chang Gung Memorial Hospital
  More Information

Responsible Party: AS Chao, MD, Chang Gung Memorial Hospital
ClinicalTrials.gov Identifier: NCT00768014     History of Changes
Other Study ID Numbers: 97-1707B
YY Wai
JJ Wang
ZH Wang
First Submitted: October 5, 2008
First Posted: October 7, 2008
Last Update Posted: October 7, 2008
Last Verified: October 2008

Additional relevant MeSH terms:
Labor Pain
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms