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Locked in syndrome — Clinical Guidelines

Overview

Locked-in syndrome is a rare neurological condition characterized by near-total paralysis of voluntary muscles and inability to speak, while consciousness and cognitive function remain intact 1 3.

Diagnosis

Key Diagnostic Criteria: Quadriplegia, anarthria, preserved consciousness, and intact cognitive function 1 3.

Recommended Tests: MRI to identify lesions in the ventral pons or midbrain; EEG and brainstem auditory evoked potentials (BAEPs) may show normal findings or slight abnormalities 1 5.

Differential Diagnosis: Distinguish from vegetative state, minimally conscious state, and akinetic mutism through detailed clinical assessment and neuroimaging 2 3.

Management

First-Line Treatments: Aggressive management of underlying causes (e.g., tumor, vascular events) 1 2.

Sedation Management: Use of bispectral index monitoring for reliable titration of sedation 1.

Rehabilitation: Intensive rehabilitation, including exercises, can lead to functional and speech improvements 2.

Communication Aids: Utilize eye-tracking devices and other assistive communication technologies 3.

Special Populations

Rehabilitation Impact: Even in elderly patients, rehabilitation can yield significant functional improvements despite prolonged periods without intervention 2.

Key Recommendations

Aggressively manage and treat the underlying cause of locked-in syndrome to potentially achieve meaningful recovery (Evidence: Moderate 1 2).

Implement bispectral index monitoring for effective sedation management in locked-in syndrome patients (Evidence: Weak 1).

Initiate intensive rehabilitation programs early, even in cases diagnosed as terminal, to facilitate recovery and functional improvement (Evidence: Moderate 2).

References

1 Quraishi SA, Blosser SA, Cherry RA. Bispectral index monitoring in the management of sedation in an intensive care unit patient with locked-in syndrome. American journal of critical care : an official publication, American Association of Critical-Care Nurses 2011. link 2 Lukowicz M, Matuszak K, Talar A. A misdiagnosed patient: 16 years of locked-in syndrome, the influence of rehabilitation. Medical science monitor : international medical journal of experimental and clinical research 2010. link 3 León-Carrión J, van Eeckhout P, Domínguez-Morales Mdel R. The locked-in syndrome: a syndrome looking for a therapy. Brain injury 2002. link 4 Park SA, Sohn YH, Kim WC. Locked-in syndrome with bilateral peduncular infarct. Journal of neuroimaging : official journal of the American Society of Neuroimaging 1997. link 5 Chia LG. Locked-in syndrome with bilateral ventral midbrain infarcts. Neurology 1991. link 6 Mauss-Clum N, Cole M, McCort T, Eifler D. Locked-in syndrome: a team approach. The Journal of neuroscience nursing : journal of the American Association of Neuroscience Nurses 1991. link 7 Sharma SC, Ray RC, Banerjee AK. Locked in state. A clinicopathological study. The Journal of the Association of Physicians of India 1990. link

Locked in syndrome