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Impact of coronary tortuosity on coronary blood supply: a patient-specific study
Xinzhou Xie1, Yuanyuan Wang, Hongmin Zhu
1Department of Electronic Engineering, Fudan University, Shanghai, China.
Insights
Coronary tortuosity slightly impacts blood flow at rest but significantly reduces it during exercise. Patients with tortuous coronary arteries may struggle to maintain adequate blood supply during physical activity.
Area of Science:
- Cardiovascular Physiology
- Biomedical Engineering
- Medical Imaging
Background:
- Tortuous coronary arteries are frequently detected during clinical screenings.
- The clinical significance of reduced coronary pressure due to tortuosity on blood supply remains unclear.
Purpose of the Study:
- To investigate the impact of coronary tortuosity (CT) on coronary blood supply.
- To quantify the reduction in coronary blood supply caused by tortuosity under various physiological conditions.
Main Methods:
- A computational fluid dynamics (CFD) approach was employed to assess the effects of tortuosity.
- Patient-specific left anterior descending coronary artery (LAD) models, both tortuous and non-tortuous, were utilized for 3D CFD analysis.
- Lumped parameter models represented downstream vasculature, with boundary conditions simulating rest and exercise states.
Main Results:
- At rest, tortuous models maintained flow rate with <8% decrease in downstream resistance.
- During exercise, maximal coronary blood supply decreased by up to 14.9% due to tortuosity.
- To maintain perfusion during maximal dilation, tortuous models required >23% distal resistance reduction.
Conclusions:
- Coronary tortuosity has a minimal effect on coronary blood supply during rest.
- During exercise, patients with CT may exhibit insufficient distal resistance adjustment to compensate for tortuosity-induced resistance.
- This can lead to ineffective regulation of coronary blood supply during exertion.
Background:
Tortuous coronary arteries are commonly observed in clinical screenings and it may cause a reduction of the coronary pressure. However, whether this reduction leads to significant decreasing in the coronary blood supply is still unknown. The purpose of this study was to investigate the effect of the coronary tortuosity (CT) on the coronary blood supply.
Method:
A computational fluid dynamics (CFD) study was conducted to evaluate the impact of tortuosity on the coronary blood supply. Two patient-specific left anterior descending coronary artery (LAD) models and the corresponding non-tortuous models were reconstructed to perform three-dimensional CFD analysis. The lumped parameter model was coupled to the outlet of the simulated branches to represent the absent downstream vasculatures. The rest and exercise conditions were modeled by specifying proper boundary conditions.
Result:
Under resting condition, the mean flow rate could be maintained by decreasing less than 8% of the downstream vascular bed's resistance for tortuous models. While during exercise (maximal dilatation condition), the maximal coronary blood supply would reduce up to 14.9% due to tortuosity. Assuming that the flow rate can be maintained by the auto-regulation effect under the maximal dilatation condition, the distal resistances for CT models still have to reduce more than 23% to maintain blood perfusion.
Conclusions:
Coronary tortuosity has minor influence on coronary blood supply at rest; while during exercise, patients with CT may lack the ability to adjust distal resistance sufficiently to compensate for the extra resistances generated by tortuosity and this may further lead to an ineffective regulation of the blood supply.
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