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Using the Accelerometers Integrated in Smartphones to Evaluate Essential Tremor.

Suhan Senova1, Damien Querlioz, Claire Thiriez

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A new smartphone app effectively quantifies essential tremor severity using built-in accelerometers. This objective tool offers greater accuracy and reproducibility than traditional clinical scales for tremor evaluation.

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Area of Science:

  • Neurology
  • Biomedical Engineering
  • Medical Technology

Background:

  • Essential tremor diagnosis and management rely on accurate tremor evaluation.
  • Current methods like clinical scales are subjective and prone to variability.
  • Existing medical devices for tremor quantification are often inaccessible or costly.

Purpose of the Study:

  • To demonstrate the efficacy of a smartphone application (iTremor) for quantifying essential tremor.
  • To assess the usability of smartphone accelerometers for objective tremor measurement.

Main Methods:

  • Development of a free iPhone/iPod application, iTremor.
  • Evaluation of tremor parameters (acceleration, frequency, magnitude) in 8 patients with essential tremor.
  • Comparison of iTremor measurements with clinical scores during on and off deep brain stimulation.

Main Results:

  • The iTremor application showed good correlations with clinical tremor scores.
  • Smartphone-based tremor quantification demonstrated superior discriminatory power and reproducibility compared to clinical scores.
  • Objective tremor measurements were obtained for both postural and action tremors.

Conclusions:

  • The iTremor smartphone application provides a viable tool for routine, objective essential tremor evaluation.
  • This technology can aid in more precise treatment adjustments for essential tremor patients.
  • Smartphone accelerometry offers a cost-effective and accessible method for tremor assessment.