Quantitative Evaluation of Pain during Electrocutaneous Stimulation using a Log-Linearized Peripheral Arterial Viscoelastic Model

Matsubara Hiroki

Hirano Hiroki

Hirano Harutoyo

Soh Zu

Nakamura Ryuji

Saeki Noboru

Kawamoto Masashi

Yoshizumi Masao

Yoshino Atsuo

Sasaoka Takafumi

Yamawaki Shigeto

Tsuji Toshio

Scientific Reports

In clinical practice, subjective pain evaluations, e.g., the visual analogue scale and the numeric rating scale, are generally employed, but these are limited in terms of their ability to detect inaccurate reports, and are unsuitable for use in anesthetized patients or those with dementia. We focused on the peripheral sympathetic nerve activity that responds to pain, and propose a method for evaluating pain sensation, including intensity, sharpness, and dullness, using the arterial stiffness index. In the experiment, electrocardiogram, blood pressure, and photoplethysmograms were obtained, and an arterial viscoelastic model was applied to estimate arterial stiffness. The relationships among the stiffness index, self-reported pain sensation, and electrocutaneous stimuli were examined and modelled. The relationship between the stiffness index and pain sensation could be modelled using a sigmoid function with high determination coefficients, where R2 ≥ 0.88, p < 0.01 for intensity, R2 ≥ 0.89, p < 0.01 for sharpness, and R2 ≥ 0.84, p < 0.01 for dullness when the stimuli could appropriately evoke dull pain.

eng

Nature Research

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[ISSN] 2045-2322

[DOI] 10.1038/s41598-018-21223-1

[DOI] https://doi.org/10.1038/s41598-018-21223-1