Effect of postural changes on normal and stenosed common carotid artery using FSI
B Raghuvir Pai1, Anurag Ayachit, S M Abdul Khader
1Department of Mechanical Engineering, MIT, Manipal, India.
Australasian Physical & Engineering Sciences in Medicine
|February 13, 2014
Summary
Postural changes significantly impact blood flow hemodynamics, especially in stenosed arteries. Head-down positions dramatically increase blood pressure in common carotid arteries with stenosis compared to normal arteries.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Fluid Dynamics
Background:
- Gravity influences arterial hemodynamics, but its effects on stenosed arteries are understudied.
- Understanding blood flow variations during postural changes is crucial for cardiovascular health assessment.
Purpose of the Study:
- To investigate blood flow variations in normal and stenosed common carotid arteries under different gravitational conditions.
- To analyze the impact of postural changes (standing, sleeping, head-down) on arterial hemodynamics.
Main Methods:
- A fluid-structure interaction (FSI) study was performed.
- Idealized models of normal, 75% eccentric, and 75% concentric stenosed common carotid arteries were used.
- Simulations were conducted for standing, sleeping, and head-down positions.
Main Results:
- Altered gravity significantly affects blood flow conditions in the common carotid artery.
- The head-down position showed the most pronounced effects on hemodynamics.
- Stenosed common carotid arteries experienced significantly higher arterial blood pressure compared to normal arteries, particularly in the head-down position.
Conclusions:
- Postural changes, especially those involving altered gravity, have a substantial impact on blood flow and pressure within the common carotid artery.
- Individuals with common carotid artery stenosis may face heightened risks during postural changes that increase gravitational effects.
- Further research into gravity's role in stenosed arterial hemodynamics is warranted.
