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Updated: Feb 18, 2026

Author Spotlight: Enhancing Success of Ultrasound-Guided Neuraxial Anesthesia in Cases with Difficult Anatomy
Published on: January 31, 2025
Ultrasound-guided versus conventional injection for caudal block in children: A prospective randomized clinical study
Ali Ahiskalioglu1, Ahmet Murat Yayik2, Elif Oral Ahiskalioglu2
1Department of Anesthesiology and Reanimation, Ataturk University School of Medicine, Erzurum, Turkey.
Insights
Ultrasound guidance for pediatric caudal blocks improves first-attempt success and reduces complications like vascular puncture. This technique enhances safety and efficacy in children undergoing surgery.
Area of Science:
- Pediatric Anesthesiology
- Regional Anesthesia
- Medical Imaging
Background:
- Caudal blocks are common for pediatric pain management.
- Conventional caudal injection relies on anatomical landmarks.
- Ultrasound guidance offers real-time visualization during needle insertion.
Purpose of the Study:
- To compare the efficacy of ultrasound-guided sacral hiatus injection versus conventional sacral canal injection for caudal blocks in children.
- To evaluate procedural success, complications, and needle placement accuracy.
Main Methods:
- A randomized controlled trial involving 134 children (ages 5-12) undergoing elective surgery.
- Children received caudal blocks using either ultrasound guidance (Group U) or conventional landmark technique (Group C).
- Both groups received 0.125% levobupivacaine with morphine.
Main Results:
- Block performance time and success rates were similar between groups (p>0.05).
- Ultrasound guidance significantly increased the first puncture success rate (80% vs 63%, p=0.026).
- Vascular puncture and subcutaneous bulging rates were significantly lower with ultrasound guidance (p<0.05).
Conclusions:
- Ultrasound guidance is recommended for pediatric caudal injections.
- It enhances the success rate of the first puncture.
- It reduces the incidence of complications such as vascular puncture.
Study Objective:
The aim of this study was to compare the efficacies of ultrasound guided sacral hiatus injection and conventional sacral canal injection performed for caudal block in children.
Design:
Randomized controlled clinical trial.
Setting:
Operating rooms of university hospital of Erzurum, Turkey.
Patients:
One hundred-thirty four children, American Society of Anesthesiologists I-II, between the ages of 5 and 12, scheduled for elective phimosis and circumcision surgery.
Interventions:
Patients assigned to two groups for ultrasound guided caudal block (Group U, n=68) or conventional caudal block (Group C, n=66). Caudal solution was prepared as 0.125% levobupivacaine plus 10mcg/kg morphine (total volume: 0.5ml/kg), and was administered to both groups.
Measurements:
The block performing time, the block success rate, the number of needle puncture, the success at first puncture and the complications were recorded.
Main Results:
The block performing time and the success rate of block were similar between Group U and Group C (109.96±49.73s vs 103.17±45.12s, and 97% vs 93%, respectively p>0.05). The first puncture success rate was higher in Group U than in Group C (80% vs 63%, respectively p=0.026). No significant difference was observed between the groups with regard to the number of needle punctures (p=0.060). The rates of vascular puncture and subcutaneus bulging were higher in Group C than in Group U (8/66 vs 1/68, and 8/66 vs 0/68, respectively p<0.05).
Conclusions:
Despite the limitations in central neuroaxial anesthesia we recommend the use of ultrasound since it reduces the complications and increases the success rate of first puncture in pediatric caudal injection.
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