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Related Experiment Videos

Pial microvascular hemodynamics in anemia

P D Hurn1, R J Traystman, A A Shoukas

  • 1Department of Anesthesiology/Critical Care Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland 21287.

The American Journal of Physiology
|June 11, 1993
PubMed
Summary

Isovolemic hemodilution increases cerebral blood flow (CBF) but does not alter pial microvascular pressure in rats. The resulting hyperemia is primarily mediated by changes in blood viscosity, not vasodilation.

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Area of Science:

  • Physiology
  • Neuroscience
  • Vascular Biology

Background:

  • Isovolemic hemodilution and induced anemia are known to increase cerebral blood flow (CBF).
  • The response of pial microvascular pressure and arteriolar diameter to hemodilution remains incompletely understood.
  • Autoregulatory mechanisms, such as the myogenic response, may influence these changes.

Purpose of the Study:

  • To investigate whether pial microvascular pressure increases with hemodilution.
  • To determine if arteriolar diameter changes concurrently as a myogenic autoregulatory response.
  • To elucidate the mechanisms underlying the hyperemia observed during hemodilution.

Main Methods:

  • Studied first- and second-order arterioles and large venules in thiopental-anesthetized rats.

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  • Measured microvascular pressure using the servo-null technique.
  • Assessed vessel diameters via video monitoring and CBF using radiolabeled microspheres.

    • Main Results:

    • Hemodilution (hematocrit reduced to 16-36%) increased CBF but did not cause systematic pial vasodilation.
    • Intraluminal pressure in pial microvessels did not increase, indicating negligible proximal vasodilation.
    • Vascular resistance decreased proportionally in both large vessel and microvascular segments.

    Conclusions:

    • Experimental anemia does not alter microvascular pressure in the rat pial circulation.
    • The hyperemia associated with hemodilution is predominantly mediated by reduced blood viscosity.
    • Myogenic autoregulation does not appear to be the primary driver of hyperemia in this model.