Do ICP-Derived Parameters Differ in Vegetative State from Other Outcome Groups After Traumatic Brain Injury?

Area of Science:

• Neuroscience
• Critical Care Medicine
• Neurological Surgery

Background:

• Traumatic brain injury (TBI) can lead to various neurological outcomes, including persistent vegetative state (VS).
• Understanding the physiological differences between patients with different TBI outcomes is crucial for prognosis and management.
• Intracranial pressure (ICP) monitoring provides valuable data for assessing brain injury severity.

Purpose of the Study:

• To compare intracranial pressure (ICP)-derived indices and demographic data between patients who developed a vegetative state (VS), survived without VS (S), and died (D) following TBI.
• To identify physiological markers that differentiate VS patients from other outcome groups.

Main Methods:

• Retrospective analysis of continuous computer-recorded signals from nearly 1,000 TBI patients monitored between 1992-2014.
• Comparison of mean arterial blood pressure (ABP), ICP, cerebral perfusion pressure (CPP), pressure reactivity index (PRx), slow ICP vasogenic waves, and heart rate (HR) between outcome groups (VS, S, D).

Main Results:

• Mean arterial blood pressure was lowest in the VS group compared to both the died (p = 0.02) and survived groups.
• Mean ICP was significantly lower in VS patients than in those who died (p < 0.001) but not significantly different from survivors.
• The magnitude of slow vasogenic ICP waves was significantly lower in VS patients compared to survivors (p = 0.01).

Conclusions:

• Patients progressing to VS after TBI exhibit distinct physiological profiles compared to non-VS survivors and those who die.
• Decreased power of slow vasogenic waves differentiates VS patients from non-VS survivors.
• Absence of significant intracranial hypertension distinguishes VS patients from those who died.