Head position, intracranial pressure, and compliance.

Area of Science:

• Neuroscience
• Critical Care Medicine
• Neurosurgery

Background:

• Elevated intracranial pressure (ICP) is a critical condition in intensive care units (ICUs).
• Head positioning is a common intervention to manage ICP, but its effectiveness is debated.
• Intracranial compliance, a measure of the brain's ability to tolerate volume changes, is also crucial in managing ICP.

Purpose of the Study:

• To investigate the effect of different head positions on intracranial pressure (ICP) and intracranial compliance.
• To determine if routine head elevation is optimal for all patients with raised ICP.
• To validate the use of subarachnoid screw devices for measuring intracranial compliance.

Main Methods:

• Nineteen consecutive ICU patients with elevated ICP were studied.
• ICP and intracranial compliance were measured at different head positions (0 and 60 degrees elevation).
• Subarachnoid screw devices were validated by simultaneous intraventricular and subarachnoid pressure recordings in a subset of patients.

Main Results:

• Ten patients showed lower ICP with the head elevated at 60 degrees.
• Two patients had lower ICP at a 0-degree head position.
• Seven patients showed no change in ICP with head positioning.
• Intracranial compliance improved with head elevation in five patients, improved with head lowering in four, and remained unchanged in ten.

Conclusions:

• Individualized head positioning is crucial for managing elevated ICP.
• Routine head elevation may not be universally beneficial and can be ineffective for some patients.
• Optimal head positioning should be tailored to each patient's specific condition to improve ICP management and intracranial compliance.