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Outcomes from stereotactic surgery for essential tremor.

Robert Francis Dallapiazza1, Darrin J Lee2, Philippe De Vloo2

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Deep brain stimulation (DBS) and thalamotomy procedures like radiofrequency (RF), radiosurgery (RS), and focused ultrasound (FUS) effectively treat essential tremor (ET). All methods improve quality of life, with varying benefits and risks to consider for patient selection.

Keywords:
electrical stimulationstereotaxic surgerytremorultrasound

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Area of Science:

  • Neurosurgery
  • Neurology
  • Medical Technology

Background:

  • Essential tremor (ET) is a neurological disorder impacting motor control.
  • Surgical interventions are available for ET, each with distinct characteristics.
  • Deep brain stimulation (DBS) and various thalamotomy techniques are primary surgical options.

Purpose of the Study:

  • To compare the efficacy and safety of different surgical treatments for essential tremor.
  • To review and appraise the benefits and drawbacks of DBS, RF, RS, and FUS thalamotomy.
  • To guide neurosurgeons and patients in selecting the optimal ET surgical procedure.

Main Methods:

  • Literature review and comparative analysis of existing studies on ET surgical treatments.
  • Evaluation of tremor reduction percentages, long-term efficacy, and quality of life improvements.
  • Assessment of reported adverse effects and neurological complications associated with each modality.

Main Results:

  • Deep brain stimulation (DBS) and thalamotomy procedures show significant tremor reduction in essential tremor patients.
  • One-year tremor reduction ranged from 35% to 90% across treatments (unilateral DBS: 53-63%; RF: 74-90%; RS: 48-63%; FUS: 35-75%).
  • Bilateral DBS offered greater tremor reduction (66-78%), and quality of life improved across all methods; transient adverse effects were common, with permanent complications more frequent in RF thalamotomy.

Conclusions:

  • Thalamic DBS is a safe and effective long-term treatment for essential tremor.
  • Thalamotomy techniques (RF, RS, FUS) offer comparable benefits to unilateral DBS, suitable for patients unsuitable for DBS.
  • Careful consideration of procedural nuances and patient-specific factors is crucial for selecting the appropriate surgical treatment for ET.