Ultrasound Evaluation of Two Anatomic Landmarks in Spinal Anesthesia for Cesarean Section: the Posterior Superior Iliac Spine VS Iliac Crest

Last updated: January 30, 2026
Sponsor: The Third Affiliated Hospital of Guangzhou Medical University
Overall Status: Active - Recruiting

Phase

N/A

Condition

Anesthesia

Anesthesia (Local)

Treatment

N/A

Clinical Study ID

NCT06711601
[2024] No. 131
  • Female

Study Summary

Intercristal line as palpation landmarks to identifying the vertebral level is frequently inaccurate.To find more safe and reliable body surface markers and convenient methods to be solved in clinical work.The investigators performed a two-stage study to evaluated the accuracy of intercristal line and the The Posterior Superior Iliac Spine (PSIS) line to identify the lumbar interspinous spaces for spinal anesthesia using ultrasonography in pregnant woman which will provide a second option.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • After obtaining written informed consents,pregnant women at 37-42 weeks of gestation

Exclusion

Exclusion Criteria:

  • BMI ≥ 40 kg/m² (to minimize palpation variability), History of lumbarsurgery/deformity (scoliosis, spondylolisthesis or osteoporotic vertebral collapse),Inability to maintain the flexed lateral decubitus position, Participant withdrawal,Unforeseen anatomical anomalies discovered during screening.

Study Design

Total Participants: 660
Study Start date:
October 10, 2024
Estimated Completion Date:
January 23, 2026

Study Description

The investigators performed a two-stage study to evaluated the accuracy of Intercristal line and the PSIS line to identify the lumbar intervertebral space for spinal anesthesia using ultrasonography in pregnant woman. In phase 1, the distances between the PSIS line and each lumbar interspinous space is measured by ultrasound,and the mean and 95% confidence interval of distances in pregnant women with different height ranges were calculated to provide a reference for identifying specific lumbar spaces.In phase 2, a further 230 participants were received the PSIS, Intercristal line or both as palpation landmarks to define specific lumbar spaces.

Connect with a study center

  • The Third Affiliated Hospital of Guangzhou Medical University

    Guangzhou, Guangdong
    China

    Site Not Available

  • The Third Affiliated Hospital of Guangzhou Medical University

    Guangzhou 1809858, Guangdong 1809935
    China

    Active - Recruiting

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