STEIN Fireside Podcast: Microelectrode Recording in DBS Surgery

In this episode, Dr. Kai Miller (Neurosurgery) and Dr. Bryan Klassen (Neurology) from Mayo Clinic dive into the fundamentals of microelectrode recording (MER) and its role in deep brain stimulation (DBS) surgery.

They break down:

Why Microelectrode Recording Still Matters

• The ongoing debate of awake vs. asleep DBS
• Whether MER is “outdated” or still essential in the era of advanced imaging
• Their philosophy: MER is a critical adjunct, not a replacement for high‑resolution MRI

How MER Works

• Using high‑impedance microelectrodes to detect single‑neuron activity
• Listening to real‑time firing patterns to confirm entry into specific brain structures
• Differentiating white matter vs. gray matter, nucleus boundaries, and disease‑related firing patterns

Mapping the Brain During Surgery

• “Exploratory” vs. “confirmatory” MER approaches
• Using the Ben Gun device for multi‑trajectory mapping
• Understanding firing signatures of

What Surgeons Listen For

• Voluntary movement‑related cell firing
• Passive movement sensory responses
• Tremor‑coherent neuronal firing
• Visual pathway confirmation using optic tract flashes

Why This Matters for Patient Outcomes

• MER helps surgeons precisely place modern segmented DBS leads, which require millimeter‑level accuracy
• Ensures targeting of the most symptom‑relevant neural circuits
• Helps avoid complications by identifying sensitive regions (e.g., sensory thalamus, optic tract)

The Human Element

• Importance of patient comfort and open interaction during awake DBS
• Real‑time teamwork between neurology, neurosurgery, and the OR staff