Patient position during lumbar puncture has no meaningful effect on cerebrospinal fluid opening pressure in children

Area of Science:

• Pediatric Neurology
• Clinical Measurement Science

Background:

• Cerebrospinal fluid opening pressure measurement is crucial for diagnosing neurological conditions in children.
• Current recommendations for lumbar puncture positioning to ensure accurate opening pressure readings have not been formally validated in pediatric populations.

Purpose of the Study:

• To evaluate the effect of lateral recumbent position (flexed vs. extended) on cerebrospinal fluid opening pressure measurements in children.
• To determine if the extended position significantly reduces opening pressure compared to the flexed position in pediatric patients.

Main Methods:

• A single-center prospective cohort study involving 53 pediatric patients (mean age 11.7 years).
• Cerebrospinal fluid opening pressure was measured in both the flexed and extended lateral recumbent positions before fluid removal.
• Statistical analysis was performed to compare pressure measurements between the two positions.

Main Results:

• The mean cerebrospinal fluid opening pressure was statistically higher in the flexed position (25.1 cm H2O) compared to the extended position (24.4 cm H2O).
• The mean difference was 0.6 cm H2O (P < .03), indicating a statistically significant but small elevation in the flexed position.
• Over 92% of measurements showed a difference of less than 5 cm H2O between the two positions.

Conclusions:

• Performing lumbar puncture in the extended lateral recumbent position results in a statistically significant decrease in cerebrospinal fluid opening pressure in children.
• While statistically significant, the observed difference in opening pressure between positions is small and may lack clinical significance.
• The findings support the practice of using the extended lateral recumbent position for more accurate cerebrospinal fluid opening pressure measurements in pediatric patients.