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Related Experiment Video

Updated: Jul 27, 2026

Evaluating Regional Pulmonary Deposition using Patient-Specific 3D Printed Lung Models
07:56

Evaluating Regional Pulmonary Deposition using Patient-Specific 3D Printed Lung Models

Published on: November 11, 2020

A computer simulation of pulmonary perfusion in three dimensions

R W Glenny1, H T Robertson

  • 1Department of Medicine, University of Washington, Seattle 98195, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1995
PubMed
Summary

A novel 3D vascular model explains pulmonary perfusion, showing local positive correlations and distant negative correlations in blood flow. This model reveals how lung vascular structure influences blood flow distribution.

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Area of Science:

  • Physiology
  • Biophysics
  • Computational Biology

Background:

  • Pulmonary perfusion exhibits spatial correlation, with local regions showing similar flow and distant regions showing negative correlation.
  • Negative correlation in organ blood flow is a unique phenomenon not widely observed in other natural processes.
  • Understanding the mechanisms behind pulmonary perfusion patterns is crucial for diagnosing and treating lung diseases.

Purpose of the Study:

  • To investigate if a 3D branching vascular model can replicate the observed negative correlation in pulmonary perfusion.
  • To explore the relationship between the structure of the pulmonary vascular tree and the spatial distribution of blood flow.
  • To refine the model by incorporating physiological factors like gravity and posture.

Main Methods:

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Isolated Lung Perfusion System in the Rabbit Model
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Isolated Lung Perfusion System in the Rabbit Model

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Design and Implementation of a Rat Ex Vivo Lung Perfusion Model
04:38

Design and Implementation of a Rat Ex Vivo Lung Perfusion Model

Published on: May 26, 2023

Related Experiment Videos

Last Updated: Jul 27, 2026

Evaluating Regional Pulmonary Deposition using Patient-Specific 3D Printed Lung Models
07:56

Evaluating Regional Pulmonary Deposition using Patient-Specific 3D Printed Lung Models

Published on: November 11, 2020

Isolated Lung Perfusion System in the Rabbit Model
10:18

Isolated Lung Perfusion System in the Rabbit Model

Published on: July 15, 2021

Design and Implementation of a Rat Ex Vivo Lung Perfusion Model
04:38

Design and Implementation of a Rat Ex Vivo Lung Perfusion Model

Published on: May 26, 2023

  • A 3D dichotomously branching vascular tree model was developed to simulate blood flow distribution.
  • Flow asymmetry was modeled using a parameter (gamma) randomly chosen from a normal distribution at each bifurcation.
  • The model incorporated gravitational effects and postural biases (supine-prone) to simulate realistic perfusion gradients.

Main Results:

  • The model successfully reproduced local positive and distant negative correlations in regional perfusion, mirroring experimental observations.
  • The refined model accounted for isogravitational perfusion heterogeneity and differences in supine-prone perfusion gradients.
  • The model demonstrated that gravity has a relatively small contribution to overall perfusion heterogeneity and showed fractal flow distributions.

Conclusions:

  • The 3D branching vascular model provides a mechanistic explanation for the spatially correlated and heterogeneous nature of pulmonary blood flow.
  • The model successfully links pulmonary vascular tree structure to observed perfusion patterns, including unique negative correlations.
  • This computational approach offers insights into lung physiology and can aid in understanding conditions affecting pulmonary perfusion.