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Method for Bioimpedance Assessment of Superficial Head Tissue Microcirculation.

Andrey Briko1,2, Pavel Ryazantsev1,2, Artem Gubko2

  • 1Biomedical Department, Bauman Moscow State Technical University, Moscow 105005, Russia.

Sensors (Basel, Switzerland)
|December 11, 2025
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Summary

Electrical impedance monitoring shows promise for assessing head tissue blood flow during cardiac surgery. This non-invasive method accurately tracks microcirculation changes, aiding surgical decisions and improving patient outcomes.

Keywords:
bioimpedancecardiac surgeryelectrical impedance analysisintraoperative monitoringlaser doppler flowmetrymicrocirculationnon-invasive monitoringtissue perfusion

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Surgical Monitoring

Background:

  • Assessing microcirculation is crucial for monitoring tissue perfusion and systemic hemodynamics during surgery.
  • Current methods may have limitations in providing continuous, non-invasive data.
  • Superficial head tissue perfusion is an important indicator during cardiac procedures.

Purpose of the Study:

  • To evaluate the electrical impedance method for quantitative assessment of superficial head tissue blood supply changes during cardiac surgery.
  • To compare the dynamics of impedance parameters with microcirculatory indicators from laser Doppler flowmetry.
  • To determine the informativeness of electrical impedance for monitoring scalp perfusion.

Main Methods:

  • Synchronous recording of electrical impedance signals and laser Doppler flowmetry during cardiac surgeries.
  • Analysis of impedance parameters, including amplitude and temporal characteristics of the pulse signal.
  • Correlation of impedance parameter dynamics with microvascular indicators.

Main Results:

  • Consistent changes in electrical impedance parameters were observed, correlating with microvascular indicators from laser Doppler flowmetry.
  • The most significant changes in impedance parameters occurred during critical physiological state transitions: anesthesia induction, cardiopulmonary bypass initiation, and termination.
  • The electrical impedance method demonstrated informativeness in assessing scalp perfusion dynamics.

Conclusions:

  • The electrical impedance method is applicable for quantitative assessment of microcirculation in superficial head tissues during cardiac surgery.
  • This non-invasive technique offers potential for continuous, safe monitoring of tissue perfusion in the operating room.
  • Electrical impedance can serve as an additional tool for comprehensive microcirculatory assessment, enhancing the accuracy of tissue perfusion monitoring.