Predicting lumbar plexus depth in children and adolescents.

Area of Science:

• Pediatric Anesthesiology
• Regional Anesthesia
• Pain Management

Background:

• Lumbar plexus block is effective for lower extremity surgery analgesia.
• Accurate prediction of lumbar plexus depth is needed in pediatric patients due to age-related variations.
• A simple, reliable measurement is essential for safe and effective pediatric lumbar plexus blocks.

Purpose of the Study:

• To identify a simple surface anatomy measurement that accurately predicts lumbar plexus depth in children.
• To establish a patient-specific predictor for lumbar plexus block in pediatric patients.
• To improve the safety and efficacy of lumbar plexus blocks in children.

Main Methods:

• Surface anatomy measurements, including the posterior superior iliac spine to intercristal line (PSIS-ICL) distance, were taken on 350 children undergoing lower extremity surgery and lumbar plexus block.
• Lumbar plexus depth was determined using peripheral nerve stimulation under general anesthesia.
• Linear regression analysis was employed to assess the relationship between anatomical measurements and lumbar plexus depth.

Main Results:

• A strong linear correlation (R(2) = 0.89, P < 0.0001) was observed between PSIS-ICL distance and lumbar plexus depth.
• The median absolute difference between predicted and actual lumbar plexus depth was 2 mm (IQR 1-5 mm).
• Ninety-two percent of patients had lumbar plexus depths within ±10 mm of the predicted depth using the PSIS-ICL measurement.

Conclusions:

• The PSIS-ICL distance is a highly accurate, patient-specific predictor of lumbar plexus depth in children across a wide age range.
• This simple measurement eliminates the need for complex calculations, guiding ultrasound use and needle selection.
• Utilizing the PSIS-ICL distance can potentially reduce complications associated with pediatric lumbar plexus blocks.