Microsurgical DREZotomy (MDT) for pain, spasticity, and hyperactive bladder: a 20-year experience

Area of Science:

• Neurosurgery
• Pain Management
• Neurology

Background:

• Micro-DREZ-tomy (MDT) has been utilized since 1972 to address complex neurological conditions.
• The procedure involves precise lesions within the Dorsal Root Entry Zone (DREZ) to modulate pain and spasticity signals.

Purpose of the Study:

• To evaluate the efficacy and indications of micro-DREZ-tomy in a large patient cohort.
• To detail the surgical methodology and anatomical targets of MDT.
• To identify optimal patient candidates for MDT.

Main Methods:

• Performed on 367 patients for cancer pain, neurogenic pain, hyperspasticity, and hyperactive neurogenic bladder.
• Involved creating precise lesions in the Dorsal Root Entry Zone (DREZ) using bipolar coagulation.
• Lesion depth and angle adjusted based on neurological status and desired therapeutic effect, targeting specific fiber tracts and dorsal horn layers.

Main Results:

• MDT effectively targets nociceptive and myotatic fibers while sparing crucial lemniscal pathways.
• Different degrees of MDT (1, 2, or 3) allow for selective interruption of specific neural components.
• Successful application in localized cancer pain, neuropathic pain (brachial plexus, spinal cord lesions, peripheral nerve injuries), spasticity, and bladder dysfunction.

Conclusions:

• Micro-DREZ-tomy is a versatile neurosurgical technique for managing refractory neuropathic pain and spasticity.
• Careful patient selection based on pain characteristics and neurological deficits is crucial for optimal outcomes.
• MDT offers a targeted approach to modulate aberrant neural activity contributing to pain and hyperreflexia.