3 Eras of Parkinson's Surgery: Destroy → Modulate → Respond

Thalamotomy in the VIM silences tremor.

Pallidotomy in the GPi eases rigidity, slowness, and dyskinesias.

Ablative lesions are permanent and cannot be undone or adjusted as the disease progresses.

In 1987 in Grenoble, Benabbi switched on high frequency stimulation above 100 hertz, and the tremor vanished instantly, reversibly.

Stimulating the STN produced the same benefit as destroying it, so the benefit was never about the tissue.

With DBS, the structure stays intact and the surgeon can adjust amplitude, frequency, pulse width, and treat both sides safely.

The early STEM trial confirmed DBS beat medical therapy on quality of life.

Adaptive DBS devices record local field potentials from the STN, watching for pathological beta oscillations.

Pathological beta oscillations are a 13 to 30 Hz rhythm that suppresses movement.

When beta appears, stimulation fires; when it fades, it eases off.

Adaptive DBS results in less unnecessary current, longer battery life, and fewer side effects.