Validation of a precision tremor measurement system for multiple sclerosis

Area of Science:

• Neurology
• Biomedical Engineering
• Rehabilitation Science

Background:

• Multiple Sclerosis (MS) tremor is a significant challenge with limited understanding of its pathophysiology and treatment options.
• Current clinical trials often depend on subjective rating scales, which have limitations in sensitivity and inter-rater reliability.

Purpose of the Study:

• To introduce and validate TREMBAL, a novel instrument employing electromagnetic motion capture technology for objective quantification of MS tremor.
• To compare the performance of TREMBAL against established clinical rating scales in measuring MS tremor.

Main Methods:

• TREMBAL was validated by comparing its measurements to clinical ratings in 310 tremor samples from 13 MS participants performing various hand exercises.
• Regression modeling was utilized to assess the congruence between TREMBAL data and clinical observations.
• Minimum Detectable Change (MDC) and test-retest reliability were calculated for both TREMBAL and clinical ratings.

Main Results:

• The velocity of the index finger measured by TREMBAL demonstrated strong agreement with clinical observations.
• TREMBAL exhibited a marginally lower Minimum Detectable Change (MDC) (84%) compared to clinical ratings (91%).
• TREMBAL achieved higher test-retest reliability (Intra-class correlation: 0.781) than clinical ratings (0.703), and MS tremor was significantly lower in healthy subjects (p=0.002).

Conclusions:

• TREMBAL provides objective and reliable quantification of MS tremor, showing agreement with clinical assessments.
• The novel instrument offers improved sensitivity and reliability over subjective clinical scales, aiding in the evaluation of MS tremor interventions.
• TREMBAL represents a valuable tool for advancing MS tremor research and clinical trial efficacy assessment.