Related Experiment Videos
A model of fluid flow in solid tumors
1Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA, USA. cpozrikidis@ucsd.edu
Annals of Biomedical Engineering
|March 12, 2003
Summary
This study models fluid flow in solid tumors, integrating interstitial and vascular dynamics. The model accurately predicts tumor blood flow and highlights the error in assuming uniform interstitial pressure for extravasation rate calculations.
Area of Science:
- Biophysics
- Mathematical Biology
- Oncology
Background:
- Solid tumors feature porous interstitium and permeable neoplastic vasculature.
- Tumor blood flow involves complex interstitial and vascular dynamics, with extravasation through capillary walls.
Purpose of the Study:
- To develop an integrated theoretical model for fluid flow within solid tumors.
- To analyze the hydrodynamics of vascular and interstitial pressures and their impact on extravasation.
Main Methods:
- Integrated theoretical model combining Darcy's law (interstitium), Poiseuille's law (vasculature), and Starling's law (extravasation).
- Formulation as a coupled system of integral and differential equations for vascular and interstitial pressures.
- Numerical computation for an idealized single-tube vasculature model.
Main Results:
- The model explains singular behavior in experimental vascular resistance using hydraulic conductivity coefficients.
- Numerical solutions and charts of hydraulic conductivities were generated for various tissue and capillary wall conductivities.
- Results align well with laboratory observations in the physiological range.
Conclusions:
- The developed model provides a comprehensive understanding of tumor hydrodynamics.
- The assumption of uniform interstitial pressure is often inappropriate and can lead to significant errors in extravasation rate predictions.