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A method of local skin perfusion detection.

¹Department of Medical Biophysics, Biometrics and Informatics, Faculty of Medicine, Palacký University, Olomouc, Czech Republic.

Journal of Medical Systems

|November 1, 2000

Summary

This study investigated skin perfusion effects on epidermal impedance at acupuncture points. Researchers found it impossible to measure these changes due to high serial resistance in the four-electrode method.

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Area of Science:

Biophysics
Dermatology
Traditional Chinese Medicine

Background:

Epidermal surface exhibits inhomogeneities, including lower local impedance at specific regions like Head's zones, sweat glands, and acupuncture points.
Understanding these impedance variations is crucial for various diagnostic and therapeutic applications.

Purpose of the Study:

To examine the effect of skin perfusion on epidermal impedance specifically at acupuncture points.
To evaluate factors influencing the reproducibility and comparability of epidermal impedance measurements.

Main Methods:

Impedance plethysmography was employed to measure epidermal impedance at acupuncture points.
Both four-electrode (constant current) and two-electrode measurement methods were utilized.
A custom-developed micro-electrode was used to determine the size of active skin points.

Main Results:

The study demonstrated the impossibility of measuring changes in skin impedance at acupuncture points that correlate with blood perfusion.
High serial resistance encountered in the four-electrode measurement method was identified as the primary limitation.
Factors such as electrode pressure and exciting current characteristics were evaluated for their impact on measurement reproducibility.

Conclusions:

The applied four-electrode measurement method is unsuitable for assessing the influence of skin perfusion on epidermal impedance at acupuncture points due to inherent resistance issues.
Further methodological development is required to accurately measure dynamic impedance changes related to perfusion in these specific skin regions.

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