What question did this study set out to answer?

To determine how capillary permeability limitations affect the accuracy of local cerebral blood flow measurements when using [14C]antipyrine.

July 1, 1975American Journal of Physiology-Legacy Content

Permeability limitation in estimation of local brain blood flow with 14Cantipyrine

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Authors

WEW. W. Eckman RPR. D. Phair JFJD FenstermacherState University of New York

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Implication

Comparative animal study demonstrates underestimation of local cerebral blood flow with antipyrine in cats, indicating diffusion-limited uptake undermines tracer accuracy.

Key Points

To determine how capillary permeability limitations affect the accuracy of local cerebral blood flow measurements when using [14C]antipyrine.
Simulated the mathematical relationship between capillary permeability-surface area products and local cerebral blood flow across varying gray and white matter perfusion rates.
Measured local cerebral blood flow in cat models using both [14C]antipyrine and the freely diffusible gas [131I]trifluoroiodomethane to compare tracer performance across brain regions.
Computer simulations showed that attaining 95% accuracy requires permeability-surface area products above 0.12 cm³·s⁻¹·g⁻¹ in gray matter and 0.035 cm³·s⁻¹·g⁻¹ in white matter, exceeding [14C]antipyrine values.
Experimental measurements in cats demonstrated consistently lower blood flow estimates with [14C]antipyrine compared with [131I]trifluoroiodomethane across all cerebral structures.
Regional blood flow underestimations closely matched simulation predictions, establishing that [14C]antipyrine transport is diffusion-limited rather than purely flow-limited.

Cite This Study

Eckman et al. (1975) studied this question.

synapsesocial.com/papers/6a70c7f98031ec7bb1dc920e https://doi.org/10.1152/ajplegacy.1975.229.1.215

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Implication

Comparative animal study demonstrates underestimation of local cerebral blood flow with antipyrine in cats, indicating diffusion-limited uptake undermines tracer accuracy.

Permeability limitation in estimation of local brain blood flow with 14Cantipyrine

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Implication

Key Points

Cite This Study

Permeability limitation in estimation of local brain blood flow with 14Cantipyrine

Discussion

Member takes

Implication

Key Points

Cite This Study

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