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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
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Simultaneous Electrical and Mechanical Stimulation to Enhance Cells' Cardiomyogenic Potential
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Mechanisms of electrical vasoconstriction.

Mark Brinton1, Yossi Mandel2, Ira Schachar3

  • 1Department of Bioengineering, University of Utah, 20 S. 2030 E., Salt Lake City, UT, 84112, USA. brintonmr@gmail.com.

Journal of Neuroengineering and Rehabilitation
|May 31, 2018
PubMed
Summary

Low-voltage electrical stimulation causes reversible vasoconstriction via neural pathways, while high-voltage stimuli activate non-neural pathways. This research offers precise control for managing blood pressure and bleeding.

Keywords:
Electrical stimulationElectroceuticalsVasoconstriction

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Electrical Stimulation

Background:

  • Electrical stimulation offers a novel method for controlling blood pressure and managing bleeding from non-compressible wounds.
  • Understanding the underlying neural and non-neural mechanisms of electrical vasoconstriction is crucial for its clinical application.

Purpose of the Study:

  • To investigate the neural and non-neural pathways involved in electrical vasoconstriction in vivo.
  • To differentiate the effects of low-voltage versus high-voltage electrical stimuli on vascular constriction.

Main Methods:

  • Delivered charge-balanced, asymmetric electrical pulses to rat saphenous vessels using varying voltage and pulse durations.
  • Assessed vasoconstriction by measuring vessel diameter and explored activation pathways using neural agonists and inhibitors.
  • Evaluated tissue viability and estimated Joule heating to rule out thermal effects.

Main Results:

  • Low-voltage stimuli induced reversible arterial constriction (41%) via neural pathways, with rapid recovery (30s).
  • High-voltage stimuli caused significant arterial (37%) and venous (40%) constriction, activating non-neural pathways with slower recovery (10 min for arteries).
  • Neural inhibitors affected low-voltage arterial constriction but not high-voltage or venous constriction, suggesting distinct mechanisms.

Conclusions:

  • Low-voltage electrical stimuli utilize neural pathways for reversible vasoconstriction.
  • High-voltage electrical stimuli activate non-neural pathways, offering a different mechanism for vascular control.
  • Tailored electrical stimuli can precisely control arterial and venous constriction, with implications for hemorrhage control, perfusion regulation, and blood pressure management.