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Numerical simulation of systemic O2 and CO2 exchange in a hyperbaric environment
M Sharan1, M P Singh, R K Saxena
1Centre for Atmospheric Sciences, Indian Institute of Technology, Delhi Hauz Khas, New Delhi, India.
Bio Systems
|January 1, 1989
Summary
Hyperbaric environments increase carbon dioxide (CO2) accumulation in tissues, particularly near the venous end of capillaries. This CO2 buildup may explain discomfort experienced by divers.
Area of Science:
- Physiology
- Biomedical Engineering
- Computational Fluid Dynamics
Background:
- Gas exchange in tissues is crucial for cellular function.
- Hyperbaric environments alter physiological gas transport dynamics.
- Understanding CO2 accumulation is vital for diver safety and performance.
Purpose of the Study:
- To numerically simulate gas exchange in systemic capillaries under hyperbaric conditions.
- To investigate the factors influencing oxygen (O2) and carbon dioxide (CO2) transport.
- To identify regions prone to CO2 accumulation and its potential physiological implications.
Main Methods:
- Utilized a Krogh tissue-cylinder model for capillary-tissue geometry.
- Developed and solved a system of non-linear governing equations numerically.
- Incorporated molecular diffusion, convection, hemoglobin saturation, and metabolic activity.
Main Results:
- Oxygen concentration decreased from capillary axis to tissue periphery.
- Carbon dioxide concentration increased from capillary axis to tissue periphery.
- Minimal radial CO2 transport observed; vulnerable region identified at the tissue periphery near the venous end.
- Hyperbaric conditions led to decreased O2 accumulation and increased CO2 accumulation.
Conclusions:
- Hyperbaric exposure enhances CO2 accumulation in peripheral tissues.
- Excessive CO2 buildup is a potential cause of diver discomfort.
- Numerical simulation provides insights into physiological responses in extreme environments.