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The Effect of Spinal Flexion in the Lateral Decubitus Position on the Unilaterality During Spinal Anesthesia

This study has been completed.
Information provided by (Responsible Party):
Jin-Tae Kim, Seoul National University Hospital Identifier:
First received: March 18, 2011
Last updated: May 26, 2012
Last verified: May 2012
For unilateral spinal block, spinal local anesthetics should take effect on the spinal nerves of one side. With full flexion of the spine, the cauda equina becomes tightened and hangs in the middle of the subarachnoid space. This study was performed to assess if flexion of the vertebral column facilitates unilateral spinal anesthesia.

Condition Intervention
Spinal Anesthesia
Other: lateral decubitus position with full spinal flexion
Other: lateral decubitus position without spinal flexion

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Supportive Care

Resource links provided by NLM:

Further study details as provided by Seoul National University Hospital:

Primary Outcome Measures:
  • Time for the complete regression of pinprick spinal analgesia on the nondependent legs [ Time Frame: Sensory and motor blockade were evaluated within 3 hour of intrathecal injection ]

Enrollment: 32
Study Start Date: March 2011
Study Completion Date: October 2011
Primary Completion Date: October 2011 (Final data collection date for primary outcome measure)
Intervention Details:
    Other: lateral decubitus position with full spinal flexion
    The patients maintained the lateral decubitus position with the hips and back fully flexed for 15 minutes.
    Other: lateral decubitus position without spinal flexion
    the patients are allowed to straighten their flexed hips and back to obtain the normal lordotic curvature of spinal column

Ages Eligible for Study:   20 Years to 45 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • ASA physical status Ⅰ-Ⅱ, scheduled for elective knee arthroscopy under spinal anesthesia

Exclusion Criteria:

  • Hemodynamically unstable patients
  • Lumbar disease
  • patients with back pain
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Please refer to this study by its identifier: NCT01321684

Korea, Republic of
Seoul national university hospital
Seoul, Korea, Republic of, 110-744
Sponsors and Collaborators
Seoul National University Hospital
  More Information

Responsible Party: Jin-Tae Kim, assistant professor, Seoul National University Hospital Identifier: NCT01321684     History of Changes
Other Study ID Numbers: H-1006-100-322
Study First Received: March 18, 2011
Last Updated: May 26, 2012 processed this record on May 25, 2017