Investigation of the Distance of the Needle Entry Point From the Anus and the Depth to Reach the Pudendal Nerve in Pudendal Nerve Block Application in Children
Sponsor study identifier
observational
50
1 country
1
Study Start
January 20, 2026
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Primary Completion
May 20, 2026
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Study Completion
June 10, 2026
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This prospective observational study aims to investigate the relationship between anatomical parameters-specifically the distance from the anus to the needle insertion point and the depth required to reach the pudendal nerve-during neurostimulation-guided pudendal nerve block and patients' age, height, and weight in children undergoing penile surgery.
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June 10, 2026
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January 9, 2026
Actual (reported)January 16, 2026
Actual (reported)January 20, 2026
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May 20, 2026
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June 10, 2026
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Horizontal distance from anus to needle insertion point and Depth from skin surface to pudendal nerve
The horizontal distance from the anus to the needle insertion point is measured in centimeters for each patient using neurostimulation-guided pudendal nerve block. Measurements are recorded separately for the right and left sides.The depth from the skin surface to the pudendal nerve is measured in centimeters using neurostimulation guidance. Measurements are recorded separately for the right and left sides. The relationship of this distance and the association of nerve depth with patient age, height, and weight will be analyzed.
During pudendal nerve block procedure
Children aged 1-18 years undergoing penile surgery with neurostimulation-guided pudendal nerve block; anatomical measurements of needle insertion distance from anus and nerve depth are recorded.
Bilateral pudendal nerve block is performed under general anesthesia with neurostimulation guidance. Anatomical measurements, including distance from anus to needle insertion point and nerve depth, are recorded for each patient. Bupivacaine 0.25% is used at 0.25 ml/kg per side, with a maximum total dose of 2 mg/kg.
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This study includes children aged 1-18 years who are undergoing penile surgery. Neurostimulation-guided pudendal nerve block will be performed, and anatomical measurements, including the horizontal distance from the anus to the needle insertion point and the depth from the skin to the pudendal nerve, will be recorded. Measurements will be taken separately for the right and left sides. Patient age, height, and weight will also be recorded, and their relationship with the anatomical measurements will be analyzed. The study will be conducted at Istanbul University-Cerrahpasa, Department of Pediatric Surgery.
Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
Bakırköy, Istanbul, 34153, Turkey (Türkiye)
Kendigelen P, Tutuncu AC, Emre S, Altindas F, Kaya G. Pudendal Versus Caudal Block in Children Undergoing Hypospadias Surgery: A Randomized Controlled Trial. Reg Anesth Pain Med. 2016 Sep-Oct;41(5):610-5. doi: 10.1097/AAP.0000000000000447.
Walker BJ, Long JB, Sathyamoorthy M, Birstler J, Wolf C, Bosenberg AT, Flack SH, Krane EJ, Sethna NF, Suresh S, Taenzer AH, Polaner DM, Martin L, Anderson C, Sunder R, Adams T, Martin L, Pankovich M, Sawardekar A, Birmingham P, Marcelino R, Ramarmurthi RJ, Szmuk P, Ungar GK, Lozano S, Boretsky K, Jain R, Matuszczak M, Petersen TR, Dillow J, Power R, Nguyen K, Lee BH, Chan L, Pineda J, Hutchins J, Mendoza K, Spisak K, Shah A, DelPizzo K, Dong N, Yalamanchili V, Venable C, Williams CA, Chaudahari R, Ohkawa S, Usljebrka H, Bhalla T, Vanzillotta PP, Apiliogullari S, Franklin AD, Ando A, Pestieau SR, Wright C, Rosenbloom J, Anderson T; Pediatric Regional Anesthesia Network Investigators. Complications in Pediatric Regional Anesthesia: An Analysis of More than 100,000 Blocks from the Pediatric Regional Anesthesia Network. Anesthesiology. 2018 Oct;129(4):721-732. doi: 10.1097/ALN.0000000000002372.
Munevver Kayhan, Lecturer Doctor
Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
Pinar Kendigelen
Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
Ayse Cigdem Tutuncu, Professor Doctor
Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
First Submitted
January 9, 2026
First Posted
January 16, 2026
Study Start
January 20, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Primary Completion
May 20, 2026
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This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
June 10, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Last Updated
January 16, 2026
Record last verified: 2026-01
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