Not Yet Recruiting

NCT Number: NCT07348029

Anatomical Measurements of Pudendal Nerve Block in Children

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.

Not Yet Recruiting

Trial opening soon.

Get Notified

Key information

Conditions

Postoperative Pain Management Penile Surgery-Related Pain

Age range

1 year–18 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty

Bakırköy, Istanbul, 34153, Turkey (Türkiye)

Location contact

Munevver Kayhan, Lecturer Doctor

CONTACT

[email protected]

02124143000

About this study

The pudendal nerve originates from the sacral nerve roots Sacral2-Sacral4 and provides sensory and motor innervation to the penile and perineal regions. Effective postoperative analgesia is essential in pediatric penile surgeries. Pudendal nerve block may provide longer-lasting and more effective analgesia compared to caudal or penile blocks.

However, due to age- and size-related anatomical variability in children, data regarding optimal needle insertion distance and depth to reach the pudendal nerve are limited. In this study, neurostimulation will be used to confirm pudendal nerve localization, and anatomical measurements will be analyzed in relation to demographic parameters.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Children aged 1-18 years
Scheduled for penile surgery (e.g., hypospadias, phimosis)
Planned to receive neurostimulation-guided pudendal nerve block
Patient and parents/legal guardians willing to participate under general anesthesia

Exclusion criteria

Patients with incomplete measurement data
Cases where successful nerve block cannot be performed or nerve stimulation is not detectable at currents ≥1.5 mA
Patients or parents/legal guardians who refuse pudendal nerve block
Patients with pelvic deformities or neuromuscular disorders

Treatment and study plan

Neurostimulation-Guided Pudendal Nerve Block

Procedure

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.

Primary outcomes

Horizontal distance from anus to needle insertion point and Depth from skin surface to pudendal nerve

Time frame: During pudendal nerve block procedure

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.

Study contacts

Contact information is provided by the study sponsor or research team.

Munevver Kayhan, Lecturer Doctor

CONTACT

[email protected]

02124143000

Pinar Kendigelen, Professor Doctor

CONTACT

[email protected]

02124143000

Sponsors and collaborators

Lead sponsor

Istanbul University - Cerrahpasa

Other

Registry information

Official study title

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

Important dates

Study start: 2026
Primary completion: 2026
Study completion: 2026
First posted: Jan 16, 2026
Registry last updated: Jan 16, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Not Yet Recruiting