Locked-in syndrome

Disease Description (Causes and Symptoms)

• Definition summary: A condition in which consciousness is preserved, but voluntary movement of the limbs and face (including speech articulation and chewing) is almost or completely impossible. From the outside, it may be mistaken for coma, but the brain’s state of arousal is preserved.
• Main causes: Extensive lesions of the pons (ventral pons) or anterior brainstem — commonly cerebral infarction caused by embolism or thrombosis of the basilar or vertebral arteries, brainstem hemorrhage, traumatic brain injury, and others.
• Pathophysiology: Damage to the pyramidal tracts (corticospinal tracts) and corticobulbar tracts (corticonuclear tracts) in the pons prevents motor commands from being transmitted to the periphery. Structures responsible for arousal and consciousness (the RAS), as well as those controlling vision and vertical eye movements, are usually preserved, making communication through blinking or vertical eye movements possible.
• Typical symptoms
  • Generalized paralysis of the limbs (near-complete or complete paralysis of the limbs)
  • Inability to communicate (aphasia/inability to vocalize, anarthria)
  • Eyes: vertical eye movements and blinking preserved (horizontal eye movements are often lost)
  • Consciousness is clear, but responses are limited to eye movements, blinking, and similar actions
  • Sensation may be relatively preserved but can vary depending on the extent of the lesion
  • Associated symptoms: respiratory difficulty, signs of increased intracranial pressure, cognitive impairment (when the cortex is also involved), and others

Treatment Methods (Including Standard Treatment, Medications, Procedures/Surgery, and Lifestyle Management) and Precautions

• Acute-phase (emergency) treatment
  • Secure the airway and stabilize breathing and circulation (mechanical ventilation or tracheostomy if necessary)
  • If the cause is an ischemic cerebral infarction, attempt reperfusion as soon as possible: IV tPA (when indicated), thrombectomy (thrombus removal for basilar or vertebral artery occlusion)
  • In cases of hemorrhage, obtain a neurosurgical evaluation (to determine whether surgical drainage or decompression is needed)
• Supportive and ongoing treatment
  • Nutritional support (enteral feeding/PEG), tracheostomy and mechanical ventilator management
  • Infection prevention (pneumonia and urinary tract infections), pressure ulcer prevention, and DVT prevention (anticoagulation and compression)
  • Management of pain and spasticity: anticonvulsants and muscle relaxants (botulinum toxin for spasticity, oral or injectable medications, or, in severe cases, intrathecal baclofen may be considered)
  • Treatment of underlying conditions (blood pressure, blood glucose, anticoagulation, antiplatelet therapy, and others depending on the cause)
• Rehabilitation and promotion of functional recovery
  • Early rehabilitation is recommended (as soon as possible after onset; intensive rehabilitation is especially recommended within the first month)
  • Physical therapy, occupational therapy, respiratory rehabilitation, and voice and oral-motor therapy
  • Augmentative and alternative communication (AAC): blinking codes, eye-tracking devices, switches, and environmental control devices
  • Assistive devices (wheelchairs and orthoses) and home-environment improvements
• Social and psychological support
  • Family education, care planning, and hospice and ethical decision-making support (for long-term decision-making)
• Precautions (self-care and warnings)
  • Because the risks of aspiration pneumonia, pressure ulcers, urinary tract infections, and DVT are high, prevention and early treatment are important
  • A specialist must determine the indications and time window for reperfusion treatment, the risk of hemorrhage, and other factors
  • Discussions regarding quality of life and decision-making are needed because of long-term mechanical ventilation, dependence on nutritional support, and similar issues

Checkpoints Before an Outpatient Visit (Including Items to Bring, Information to Prepare, and Example Questions)

• Items to bring (recommended for the hospital visit)
  • A list of all medications currently being taken (including anticoagulants, antiplatelet drugs, antihypertensive drugs, and others)
  • Copies or CDs of previous test and imaging results (CT/MRI, cerebral angiography, and others)
  • Records of surgeries and procedures and a summary of hospitalization records (if available)
  • Notes documenting the time of onset and the course of symptoms
  • Information about the current communication method (such as a blinking code) and assistive devices in use
  • Information about medical devices in use (tracheostomy, mechanical ventilator, PEG tube, and others)
  • Contact information for the primary caregiver and notes on the ability to perform activities of daily living (mobility and degree of recovery)
• Items to prepare for explaining to the doctor during the outpatient visit (examples)
  • The date and time when symptoms first began and how the symptoms progressed
  • Any recent fever, respiratory difficulty, urinary symptoms, or wounds
  • Details of rehabilitation treatment (start date, frequency, and effects)
• Examples of questions for the patient/caregiver to prepare before the outpatient visit (questions to prepare before asking the doctor)
  • What range of recovery can be expected in the short and medium term given the current condition?
  • What nursing care and equipment will be needed at home?

Examples of General Questions to Ask the Doctor

• "Based on the current imaging findings, where is the lesion located and how large is it, and what does this mean for the recovery prognosis?"
• "After the acute phase, will additional reperfusion treatment or surgery be needed?"
• "When and how should rehabilitation treatment begin, and what goals can be expected?"
• "What home care is needed to prevent infections or pressure ulcers, such as repositioning and aspiration prevention?"
• "How should the selection and setup of communication assistive devices, such as eye-tracking devices and switches, be carried out?"
• "Could you explain the long-term prognosis, including independence and survival rate?"

Examples of Disease-Specific Questions

• "Based on the exact location of the pontine (or brainstem) lesion and the imaging findings (CT/MRI/angiography), what is the likelihood of recovery of this patient’s motor function?"
• "Among the currently available eye-based communication assistive devices, what specific equipment (for example, an eye tracker) is recommended for this patient, and what is the plan for initial setup and training?"