Intrathecal baclofen in patients with persistent vegetative state: 2 hypotheses

Area of Science:

• Neurology
• Neuroscience
• Pharmacology

Background:

• Persistent vegetative state (PVS) is a severe disorder of consciousness.
• Recovery from PVS is rare and often unexplained.
• Intrathecal baclofen (ITB) is typically used for spasticity.

Purpose of the Study:

• To investigate the clinical effects of ITB in patients with PVS.
• To explore potential mechanisms behind ITB's paradoxical effects in PVS.
• To provide follow-up data using the Coma Recovery Scale-Revised (CRS-R).

Main Methods:

• Treatment of 5 PVS patients with ITB for spasticity.
• Clinical assessment using the Coma Recovery Scale-Revised (CRS-R) over 6 months.
• Speculation on pharmacodynamic mechanisms.

Main Results:

• Clinical improvement observed in 4 out of 5 patients within 2 weeks of ITB administration.
• Improvements ranged from increased alertness to full consciousness recovery.
• The observed effects remained stable at 6-month follow-up.

Conclusions:

• ITB may facilitate variable degrees of clinical improvement in PVS patients.
• Hypothesized mechanisms include spinal cord modulation and sleep-wake cycle regulation.
• Further systematic research into ITB's mechanisms and applications in PVS is warranted.