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Efficacy of Peripheral Nerve Stimulator in Assessing Sensory Nerve Block Level of Spinal Anesthesia

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 February 2014 by Yonsei University.
Recruitment status was:  Active, not recruiting
Information provided by (Responsible Party):
Yonsei University Identifier:
First received: January 8, 2013
Last updated: February 17, 2014
Last verified: February 2014

Various methods are used to assess the level of anesthesia block after spinal anesthesia. Among them, ice cubes, alcohol swabs, and needles are commonly used in the clinical setting, but ice is limited by difficulties with management and transportation, and needle assessment has problems owing to the risk of pain, infection, and injury to the patient.

Hence, the alcohol swab is commonly used in practice. However, the absence of pain is more important in the surgical process, and assessing the pain block level is more feasible in practice than assessing the sensory nerve block level using the alcohol swab.

Therefore, it seems to be better to use the peripheral nerve stimulator for the accurate assessment of the pain block level. This has the advantage of continuous measurement of the block level, which can be used in a practical manner in conjunction with the surgical incision.

Hence, the author compared the conventional method using the alcohol swab with the use of the peripheral nerve stimulator to determine which method is more practical in the measurement of spinal anesthesia block level.

Condition Intervention
Orthopedic Surgery-lower Leg Surgery Device: the anticholinergic glycopyrrolate 0.1 ㎎ + 0-15 mg hyperbaric bupivacaine

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: None (Open Label)

Resource links provided by NLM:

Further study details as provided by Yonsei University:

Primary Outcome Measures:
  • Efficacy of peripheral nerve stimulator as checking sensory block level after spinal anesthesia [ Time Frame: Changes of sensory block level at 5 minutes, 10 minutes, 15 minutes, 20 minutes after pinal anesthesia ]
    The spinal anesthesia block levels were assessed and recorded using the alcohol swab and peripheral nerve stimulation, respectively.

Estimated Enrollment: 58
Study Start Date: December 2012
Estimated Study Completion Date: November 2014
Estimated Primary Completion Date: August 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: sensory nerve block level of spinal anesthesia
This test group and the control group. Because within the group in two ways to check the level after spinal anesthesia will be.
Device: the anticholinergic glycopyrrolate 0.1 ㎎ + 0-15 mg hyperbaric bupivacaine

The study subjects were patients with planned orthopedic surgery on the infrapatellar area with spinal anesthesia, and 58 patients were recruited sequentially.

A blood pressure machine, electrocardiogram, and pulse oximeter were connected to the patient in the operating room, and measurements were carried out every 5 minutes. Prior to the induction of anesthesia, the anticholinergic glycopyrrolate 0.1 ㎎ was intravenously administered after the confirmation of intravenous line opening status.

For spinal anesthesia, the patient was arranged in the lateral recumbent position, and then the L 3-4 area was disinfected. Depending on the surgical region, height, and weight of each patient, 10-15 mg hyperbaric bupivacaine was administered through a 25 G needle.


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • The study subjects were adult patients, 20-65 years old, who were going to have orthopedic surgery on the infrapatellar area with spinal anesthesia planned and who fell under the American Society of Anesthesiologist physical status classifications of 1 or 2.

Exclusion Criteria:

  • Patients who could not read or understand the consent materials or who had pregnancy, hypertension, diabetes, a defect in blood coagulation, cardiovascular disease, or administration of cardiovascular medications were excluded from the study.
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Please refer to this study by its identifier: NCT01768780

Korea, Republic of
Severance hospital
Seoul, Korea, Republic of, 120-752
Sponsors and Collaborators
Yonsei University
  More Information

Responsible Party: Yonsei University Identifier: NCT01768780     History of Changes
Other Study ID Numbers: 4-2012-0692
Study First Received: January 8, 2013
Last Updated: February 17, 2014

Keywords provided by Yonsei University:
spinal anesthesia
peripheral nerve stimulator
sensory block level

Additional relevant MeSH terms:
Cholinergic Antagonists
Central Nervous System Depressants
Physiological Effects of Drugs
Anesthetics, Local
Sensory System Agents
Peripheral Nervous System Agents
Adjuvants, Anesthesia
Muscarinic Antagonists
Cholinergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action processed this record on September 21, 2017