Digital Activity Markers in Chronic Inflammatory Demyelinating Polyneuropathy.

Area of Science:

• Neurology
• Digital Health
• Wearable Technology

Background:

• Chronic inflammatory demyelinating polyneuropathy (CIDP) is a rare autoimmune disorder affecting peripheral nerves.
• Assessing disease severity and quality of life in CIDP patients typically relies on clinical evaluations and patient-reported outcomes.
• There is a need for objective, continuous monitoring tools to complement traditional assessments in CIDP management.

Purpose of the Study:

• To evaluate the utility of smartwatch and smartphone-based activity metrics for assessing disease severity and quality of life in CIDP patients.
• To determine if wearable technology can provide objective data for monitoring CIDP progression and impact on daily living.

Main Methods:

• A prospective observational study (EMDA-CIDP trial) involving adult CIDP patients on stable IVIG therapy.
• Clinical assessments included I-RODS and INCAT disability scales and quality of life questionnaires.
• Activity metrics were collected using consumer-grade smartwatches, with adherence criteria applied; a smartphone cohort served as a comparator.

Main Results:

• Smartwatch-derived maximum daily step count strongly correlated with clinical disease severity scores (I-RODS: ρ=0.74; INCAT: ρ=-0.54).
• Additional smartwatch metrics showed correlations with quality of life domains.
• Smartphone-derived metrics from a validation cohort exhibited weaker correlations compared to smartwatch data.

Conclusions:

• Smartwatches can provide valuable, objective data for assessing disease status and quality of life in CIDP patients.
• Integrating smartwatch metrics into clinical practice may enhance traditional evaluations and improve understanding of CIDP.
• Further large-scale studies are warranted to validate these promising findings.