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NCT Number: NCT07426796

Comparison of Posterior QLB and QIPB in Pediatric Undescended Testis Surgery.

This randomized, double-blind study compares the postoperative analgesic efficacy of ultrasound-guided Posterior Quadratus Lumborum Block (QLB) versus Quadroiliac Plane Block (QIPB) in pediatric patients aged 1-7 years undergoing unilateral undescended testis surgery.

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Key information

Conditions

Postoperative Pain Congenital Abnormalities Congenital, Hereditary, and Neonatal Diseases and Abnormalities Cryptorchidism Endocrine System Diseases Genital Diseases Genital Diseases, Male Gonadal Disorders Male Urogenital Diseases Neurologic Manifestations Pain Pain, Postoperative Pathologic Processes Pathological Conditions, Signs and Symptoms Postoperative Complications Signs and Symptoms Testicular Diseases Urogenital Abnormalities Urogenital Diseases

Age range

1 year–7 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

About this study

Lower abdominal surgeries, such as undescended testis repair (orchiopexy), are common in pediatric patients and can cause significant postoperative pain. While Posterior Quadratus Lumborum Block (QLB) is a known technique for somatic and visceral analgesia, the Quadroiliac Plane Block (QIPB) is a newer approach targeting the fascial plane posterior to the iliac bone.

In this prospective, randomized, controlled trial, 70 pediatric patients (ASA I-II, aged 1-7 years) will be randomly assigned to receive either a Posterior QLB or a QIPB under general anesthesia. Both blocks will be performed using ultrasound guidance with 0.5 mL/kg of 0.25% bupivacaine.

The study aims to evaluate and compare the analgesic efficacy of these two techniques. Postoperative pain will be assessed using the FLACC scale. Secondary objectives include comparing the time to first rescue analgesic, total analgesic consumption, and incidence of complications.

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Male pediatric patients aged 1-7 years.
  • ASA physical status I or II.
  • Scheduled for unilateral undescended testis surgery.
  • Written informed consent obtained.

Exclusion criteria

  • History of neurological deficit or developmental delay.
  • Bleeding diathesis or known coagulopathy.
  • History of allergy to local anesthetics.
  • Infection or skin lesion at the block injection site.
  • Congenital spinal anomaly.
  • Mental retardation or psychiatric history.
  • Liver or kidney dysfunction.

Treatment and study plan

Ultrasound-guided Posterior Quadratus Lumborum Block.

Procedure

Patients will be placed in the lateral decubitus position. Under ultrasound guidance, the probe will be placed at the posterior axillary line. The needle will be advanced to the posterior fascial plane of the quadratus lumborum muscle. A total of 0.5 mL/kg of 0.25% Bupivacaine will be injected.

Ultrasound-Guided Quadroiliac Plane Block

Procedure

Patients will be placed in the lateral decubitus position. Under ultrasound guidance, the probe will be placed at the level of the iliac crest. The needle will be targeted to the plane where the quadratus lumborum muscle attaches to the iliac bone. A total of 0.5 mL/kg of 0.25% Bupivacaine will be injected

Primary outcomes

  1. Postoperative Pain Score (FLACC) at 12 Hours

    Time frame: 12 hours post-surgery.

    Pain severity assessed using the Face, Legs, Activity, Cry, Consolability (FLACC) scale. The total score ranges from 0 to 10, where higher scores indicate worse pain.

Secondary outcomes

  1. Time to First Rescue Analgesic Request.

    Time frame: Up to 24 hours.

    Time in minutes from surgery completion to the first dose of rescue analgesia.

  2. Total Postoperative Analgesic Consumption

    Time frame: 24 hours post-surgery.

    Cumulative amount of rescue analgesics consumed (mg).

  3. Incidence of Postoperative Complications.

    Time frame: Up to 24 hours.

    Assessment of complications such as urinary retention, motor block, hematoma, or ecchymosis at the injection site.

  4. Postoperative Pain Scores (FLACC) at Other Time Points.

    Time frame: 30 minutes, 1, 2, 4, 6, and 24 hours post-surgery.

    Pain severity assessed using the Face, Legs, Activity, Cry, Consolability (FLACC) scale at 30 minutes, 1, 2, 4, 6, and 24 hours. The total score ranges from 0 to 10, where higher scores indicate worse pain.

Study contacts

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

Burak Ömür

CONTACT

[email protected]

+905056215056

Sponsors and collaborators

Lead sponsor

Medipol University

Other

Collaborators

  • Biruni University
  • Prof. Dr. Cemil Tascıoglu Education and Research Hospital Organization

Registry information

Official study title

Comparison of the Effects of Posterior Quadratus Lumborum Block and Quadroiliac Plane Block on Analgesic Consumption in Postoperative Pain Management in Pediatric Patients Undergoing Undescended Testis Surgery

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Feb 23, 2026
Registry last updated
Jul 27, 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.

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