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Pressure-volume relationship for rat dermis: compression studies

J L Bert¹, R K Reed

¹Department of Chemical Engineering, University of British Columbia, Vancouver, Canada.

Acta Physiologica Scandinavica

|May 1, 1997

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Tissue compliance, the relationship between interstitial fluid pressure and fluid content, was measured in rat dermis. Higher hydration levels correlated with increased tissue compliance, crucial for understanding fluid balance.

Area of Science:

Biomedical Engineering
Physiology
Microcirculation Research

Background:

Tissue hydrostatic pressure and fluid content significantly influence microvascular exchange system responses.
Limited studies exist on the direct relationship between tissue pressure and fluid content.

Purpose of the Study:

To quantify the relationship between interstitial fluid pressure and tissue fluid content in rat dermis.
To determine tissue compliance across varying hydration states.

Main Methods:

In vitro compression of fully swollen rat dermis to monitor thickness changes.
Measurement of interstitial fluid pressure and tissue fluid content at steady-state.
Calculation of tissue compliance based on pressure-fluid content relationship.

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Main Results:

Tissue compliance increased with increasing tissue hydration.
Compliance varied over one order of magnitude under tested conditions.
At normal hydration, a 6.6% change in tissue fluid volume occurred per mmHg change in hydrostatic pressure.

Conclusions:

Tissue compliance is hydration-dependent, increasing with greater fluid content.
The findings provide critical data for tissue fluid balance models.
This study enhances understanding of microvascular exchange dynamics.