Influence of Multi Stenosis on Hemodynamic Parameters in an Idealized Coronary Artery Model

Document Type : Regular Article


Department of Mechanical Engineering, College of Engineering, King Khalid University, PO Box 394, Abha 61421, Kingdom of Saudi Arabia


This study explores the influence of tandem stenosis on hemodynamic constraints in idealized coronary artery models with different interspace distance between the stenosis and its severity. The blood was assumed as non-Newtonian, incompressible, and pulsatile fluid. The hemodynamic parameters of blood, such as the oscillatory shear index (OSI), wall shear stress (WSS) and time average wall shear stress (TAWSS) are obtained and compared for various degrees of stenosis and interspacing distance in various blood models. The computed results showed that as the interspacing distance between the stenosis decreases, the low wall shear stress area increases for the model P70_D70, leading to further progression of stenosis in the distal region. No significant variation was observed for the model P70_D90, whereas the low WSS region increases as the interspace distance of proximal and distal stenosis increases for the model P90_D70. The highest TAWSS sites were created across the 90% AS (area stenosis) for all the cases studied. As the higher value of TAWSS is clinically significant since it could damage the endothelial layer. It is well known that the maximum value of OSI is strongly associated with the critical areas of stenosis rupture. The maximum value of OSI was found at the proximal and distal stenosis for all the models simulated.


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Volume 15, Issue 1 - Serial Number 63
January and February 2022
Pages 15-23
  • Received: 18 January 2021
  • Revised: 12 July 2021
  • Accepted: 16 July 2021
  • First Publish Date: 12 November 2021