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Tsui Test as a Predictor of Bupivacaine Consumption in Labour Epidurals

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: NCT00792311
Recruitment Status : Completed
First Posted : November 17, 2008
Last Update Posted : March 26, 2010
Information provided by:
Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Brief Summary:
Low current electrical stimulation test, also called the Tsui test, has been used successfully to confirm the catheter location in the epidural space in various patient populations. The results of this study will show whether or not doing a Tsui test can predict inadequate epidural analgesia early in the course of placing the epidural, so that the appropriate measures could be applied immediately upon gathering unfavorable results.

Condition or disease Intervention/treatment Phase
Pain Procedure: Tsui test Not Applicable

Detailed Description:

Despite its very high success rate, the epidural technique remains a rather blind technique, and failures continue to occur. The incidence and reasons for failure are not well understood. The Tsui test is not routinely performed with each epidural catheter insertion, but rather it is used when there is suspicion about the catheter location.

In this study, the Tsui test will be performed twice during the epidural procedure, and bupivacaine consumption will be recorded for the first 2 hours.

Information gained from this study could have great impact in clinical practice, since the incidence of inadequate labor analgesia is still relatively high (10-20%), leading to maternal distress and disappointing labor experience.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 102 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Tsui Test as a Predictor of Bupivacaine Consumption in Labour Epidurals
Study Start Date : November 2008
Actual Primary Completion Date : August 2009
Actual Study Completion Date : August 2009

Resource links provided by the National Library of Medicine

Drug Information available for: Bupivacaine

Arm Intervention/treatment
Experimental: Tsui test
Tsui test administration.
Procedure: Tsui test
The stimulator is set at frequency of 1Hz with 200ms pulse width and the current output ranging from 0 to 20 mA. The current output will be carefully increased from zero until motor activity is detected up to a maximum of 20 mA.

Primary Outcome Measures :
  1. Consumption of bupivacaine in mg/hour in the first 2 hours of epidural anesthesia [ Time Frame: 2 hours ]

Secondary Outcome Measures :
  1. Incidence of inadequate epidural block. [ Time Frame: 2 hours ]
  2. Current (mA) needed to elicit motor response; 1. before test dose and 2. 5 minutes after test dose. [ Time Frame: 5 minutes ]
  3. Contraction pattern elicited by the Tsui test at baseline and after test dose. [ Time Frame: 5 minutes ]

Information from the National Library of Medicine

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, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Women over 18 years of age requesting an epidural for labor and delivery
  • Cervix dilated 0-5 cm and pain VAS>6
  • Able to communicate in English
  • Informed consent

Exclusion Criteria:

  • Refusal to provide written informed consent
  • Patients unable to communicate in English
  • Contraindication to regional anesthesia
  • Allergy or hypersensitivity to lidocaine, bupivacaine or fentanyl
  • Sedatives or opioids received prior to insertion of epidural catheter
  • Abnormal vertebral anatomy, such as previous spine surgery and scoliosis
  • Coexisting neurological disorders
  • Patients with implanted electronic devices

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 identifier (NCT number): NCT00792311

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Canada, Ontario
Mount Sinai Hospital
Toronto, Ontario, Canada, M5G 1X5
Sponsors and Collaborators
Samuel Lunenfeld Research Institute, Mount Sinai Hospital
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Principal Investigator: Jose CA Carvalho, MD MOUNT SINAI HOSPITAL

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Responsible Party: Dr. Jose C.A. Carvalho, Mount Sinai Hospital Identifier: NCT00792311    
Other Study ID Numbers: 08-02
First Posted: November 17, 2008    Key Record Dates
Last Update Posted: March 26, 2010
Last Verified: March 2010
Keywords provided by Samuel Lunenfeld Research Institute, Mount Sinai Hospital:
Tsui test
Epidural Analgesia
Additional relevant MeSH terms:
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Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents