Lumbar puncture position influences intracranial pressure

Area of Science:

• Neurology
• Medical Devices
• Clinical Measurement

Background:

• Standard lumbar puncture procedures involve maximal spinal flexion.
• Cerebrospinal fluid opening pressure (CSFop) is typically measured in a horizontal position.
• The influence of hip and neck flexion on intracranial pressure (ICP) requires further investigation.

Purpose of the Study:

• To investigate the influence of hip and neck flexion on intracranial pressure (ICP).
• To determine if these postural changes affect ICP to a clinically relevant extent.

Main Methods:

• Thirty-nine patients undergoing invasive ICP monitoring were included.
• Patients underwent either vertical (n=24) or horizontal (n=15) postural examinations.
• Varying degrees of spine flexion were assessed to measure ICP changes.

Main Results:

• Straightening the neck in a sitting position decreased ICP by 15.2 mmHg.
• Lateral recumbency increased ICP by a median of 6.9 mmHg.
• Simultaneous hip and neck extension decreased ICP by 6.4 mmHg.

Conclusions:

• Neck and hip flexion significantly confound ICP measurements.
• Positional changes can shift ICP readings between normal and pathological ranges.
• Standardized guidelines for body positioning during CSFop measurement are needed.