Stenosis in the internal carotid arteries is a serious cardiovascular condition. It is well-reported that low and oscillatory wall shear stress enhances the risk of stenosis progression. However, the effects of increased heart rates in highly stenosed arteries are not well explored. A detailed understanding of the flow features and stress distribution in stenosed carotid arteries at different heart rates may help clinicians to prescribe better exercise schedules for patients. In this study, we probe the effects of elevated heart rates on the hemodynamics in healthy and stenosed carotid arterial geometries using an immersed boundary method-based computational framework. Our results reveal that a strong recirculation, secondary velocity, and oscillatory shear index (OSI) zone develop inside a severely stenosed carotid artery at normal heart rate. Higher heart rates may potentially improve arterial health by reducing OSI only for the healthy and mild stenosis carotid arteries. However, the increased heart rates worsen the arterial health of severely stenosed arteries by onsetting flow instabilities, enhancing the spread and severity of the recirculation zone and the magnitude of the secondary velocity, the pressure drops across the stenosis, and the spread of high OSI (≥0.2) zone downstream. Furthermore, in the case of severe stenosis, the wall shear stress at the stenosis throat rises significantly, which can contribute to plaque rupture and thrombus development. Here, we report in detail the behavior of stress levels and pressure fluctuations in the carotid artery model at different stenosis levels for normal and elevated heart rates.
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Effect of heart rate on the hemodynamics in healthy and stenosed carotid arteries
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June 2023
Research Article|
June 20 2023
Effect of heart rate on the hemodynamics in healthy and stenosed carotid arteries
Piru Mohan Khan
;
Piru Mohan Khan
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft)
1
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur
, Kharagpur, West Bengal 721302, India
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Siddharth D. Sharma
;
Siddharth D. Sharma
(Data curation, Investigation, Software, Validation, Visualization, Writing – review & editing)
2
Centre for Computational and Data Sciences, Indian Institute of Technology Kharagpur
, Kharagpur, West Bengal 721302, India
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Suman Chakraborty
;
Suman Chakraborty
(Supervision, Writing – review & editing)
1
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur
, Kharagpur, West Bengal 721302, India
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Somnath Roy
Somnath Roy
a)
(Conceptualization, Funding acquisition, Project administration, Resources, Supervision, Writing – review & editing)
1
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur
, Kharagpur, West Bengal 721302, India
2
Centre for Computational and Data Sciences, Indian Institute of Technology Kharagpur
, Kharagpur, West Bengal 721302, India
a)Author to whom correspondence should be addressed: somnath.roy@mech.iitkgp.ac.in
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a)Author to whom correspondence should be addressed: somnath.roy@mech.iitkgp.ac.in
Physics of Fluids 35, 061906 (2023)
Article history
Received:
April 06 2023
Accepted:
May 04 2023
Citation
Piru Mohan Khan, Siddharth D. Sharma, Suman Chakraborty, Somnath Roy; Effect of heart rate on the hemodynamics in healthy and stenosed carotid arteries. Physics of Fluids 1 June 2023; 35 (6): 061906. https://doi.org/10.1063/5.0153323
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