Scratch Scoring by a Sheet-shaped Body Vibrometer in Nocturnal Sleep: A Pilot Study Compared with Infrared Video...

Area of Science:

• Biomedical Engineering
• Dermatology
• Sleep Medicine

Background:

• Nocturnal scratching exacerbates atopic dermatitis symptoms and disrupts sleep.
• Accurate measurement of nighttime scratching is vital for patient care but currently lacks non-wearable sensor solutions.

Purpose of the Study:

• To develop and evaluate a novel algorithm for detecting scratching behavior using a non-wearable, sheet-shaped body vibrometer.
• To compare the accuracy of the new detection method against a conventional activity score method.

Main Methods:

• A sheet-shaped body vibrometer was placed under the mattress to record vibrations during sleep.
• Simultaneous measurements were taken using an infrared camera to establish a gold standard for scratching time.
• A novel algorithm was developed to specifically identify scratching vibrations, differentiating them from other movements.

Main Results:

• The proposed algorithm achieved a higher correlation (0.89) with the gold standard scratching time compared to the conventional method (0.72).
• Bland-Altman analysis confirmed the proposed method's ability to avoid overestimation of scratching time, particularly in patients with shorter scratching durations.
• The algorithm successfully excluded non-scratching activities like turning over.

Conclusions:

• The developed non-wearable sensor and algorithm offer a reliable method for objectively assessing nocturnal scratching in atopic dermatitis.
• This technology can improve the understanding and management of sleep disturbances and symptom exacerbation in patients with itchy skin conditions.