NCT07549776|Completed
Ultrasound-guided Versus Landmark-based Spinal Anesthesia in Obese Parturients Undergoing Cesarean Section
USLMCSEOB
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USLMCSEOB
Sponsor study identifier
interventional
100
1 country
1
Study Start
July 1, 2025
Actual (reported)Primary Completion
January 1, 2026
Actual (reported)Study Completion
January 1, 2026
Actual (reported)Spinal anesthesia is the most commonly used anesthetic technique for cesarean section. However, in obese parturients, identification of the optimal puncture site using anatomical landmark palpation can be challenging because of altered anatomy. Preprocedural ultrasound has been proposed as a tool to improve localization of the puncture site and facilitate neuraxial access. This is a prospective comparative study included 100 obese parturients undergoing cesarean section under spinal anesthesia. Participants were allocated to one of two comparison groups according to the puncture site localization technique: a preprocedural ultrasound group and an anatomical landmark palpation group. The primary outcome is the first-attempt success rate, defined as successful cerebrospinal fluid return after the first needle insertion without needle redirection or a new skin puncture. Secondary outcomes include the number of puncture attempts, needle redirections, need for rescue interventions, incidence of paresthesia and vascular puncture during the procedure, and procedural times.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
January 1, 2026
Actual (reported)Click on a node to explore related trials.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
July 1, 2025
Actual (reported)January 1, 2026
Actual (reported)January 1, 2026
Actual (reported)April 9, 2026
Actual (reported)April 24, 2026
Actual (reported)First-attempt success rate of spinal anesthesia
Successful cerebrospinal fluid return after the first needle insertion without redirection.
During the spinal anesthesia procedure
Number of puncture attempts
During the spinal anesthesia procedure
Number of needle redirections
During the spinal anesthesia procedure
Need for rescue intervention
During the spinal anesthesia procedure
Incidence of paresthesia
During the spinal anesthesia procedure
Incidence of vascular puncture
During the spinal anesthesia procedure
Preprocedural ultrasound was used to identify and mark the optimal puncture site in obese parturients undergoing cesarean section (n = 50).
The puncture site was identified using anatomical landmark palpation in obese parturients undergoing cesarean section (n = 50)
Preprocedural ultrasound is used to identify and mark the optimal puncture site before spinal anesthesia.
The puncture site is identified using anatomical landmark palpation before spinal anesthesia.
National Maternal and Perinatal Institute
Lima, Lima Province, 15001, Peru
Khoo AK, Huynh A, Pelecanos A, Eley VA. Does preprocedural ultrasound prior to lumbar neuraxial anesthesia or analgesia increase first-pass success in adults with obesity? A systematic review. Health Sci Rep. 2024 Nov 6;7(11):e70039. doi: 10.1002/hsr2.70039. eCollection 2024 Nov.
Zhang Y, Peng M, Wei J, Huang J, Ma W, Li Y. Comparison of ultrasound-guided and traditional localisation in intraspinal anesthesia: a systematic review and network meta-analysis. BMJ Open. 2023 Nov 2;13(11):e071253. doi: 10.1136/bmjopen-2022-071253.
Eddisson R Quispe Pilco, MD
National Maternal and Perinatal Institute
100 participants (actual enrollment reported by the registry).
First Submitted
April 9, 2026
First Posted
April 24, 2026
The Efficacy of Intrathecal Morphine Versus Intrathecal Morphine-Dexamethasone Combination in Cesarean Delivery
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Li M, Ni X, Xu Z, Shen F, Song Y, Li Q, Liu Z. Ultrasound-Assisted Technology Versus the Conventional Landmark Location Method in Spinal Anesthesia for Cesarean Delivery in Obese Parturients: A Randomized Controlled Trial. Anesth Analg. 2019 Jul;129(1):155-161. doi: 10.1213/ANE.0000000000003795.
Perlas A, Chaparro LE, Chin KJ. Lumbar Neuraxial Ultrasound for Spinal and Epidural Anesthesia: A Systematic Review and Meta-Analysis. Reg Anesth Pain Med. 2016 Mar-Apr;41(2):251-60. doi: 10.1097/AAP.0000000000000184.
Study Start
July 1, 2025
Actual (reported)Primary Completion
January 1, 2026
Actual (reported)Study Completion
January 1, 2026
Actual (reported)Last Updated
July 7, 2026
Record last verified: 2026-07
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Source: ClinicalTrials.gov.
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