Perturbational Complexity Index
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Clinical Significance
Up to 40% of minimally conscious patients are misdiagnosed as vegetative using bedside exams. PCI achieves 94.7% sensitivity for detecting hidden awareness.
0.31
Threshold
94.7%
Sensitivity
Clinical Applications
Disorders of Consciousness
Distinguishes minimally conscious state from vegetative state when behavioral assessment fails. Changes treatment decisions for unresponsive patients.
Anesthesia Monitoring
Tracks consciousness depth during surgery. Different anesthetics produce characteristic PCI signatures — ketamine preserves dreams, propofol abolishes them.
Locked-In Syndrome
Detects fully conscious patients who cannot move or communicate. PCI remains high despite complete behavioral unresponsiveness.
Brain Injury Prognosis
Patients with covert awareness (high PCI despite unresponsiveness) have better one-year outcomes than those without.