Key result
Numerical simulation demonstrated that valve remnants and sinuses in vein grafts cause flow disturbances and undesirable hemodynamic parameter distributions, potentially leading to early atherosclerosis.
Why the study?
Do valve remnants and sinuses in saphenous vein grafts affect blood flow patterns and hemodynamic parameters compared to smooth tubes?
Do valve remnants and sinuses in saphenous vein grafts affect blood flow patterns and hemodynamic parameters compared to smooth tubes?
Computational simulations demonstrate that valve remnants in saphenous vein grafts disrupt blood flow and alter hemodynamic parameters, which may contribute to early graft atherosclerosis.
Answers are grounded in this paper and cite their sources.
May warrant remnant-aware vein graft techniques; leaves open clinical validation of atherosclerosis risk.
Venous valves and sinuses are frequently observed in vein grafts in the coronary artery bypass grafts (CABG). However, from the biomedical engineering viewpoint, vein grafts are always assumed as smooth tubes in the existing simulations, and no effort has been made to investigate the effects of jaggedness of the graft inner wall due to the valve cusps remnants and valve sinus (in case of valve-stripped saphenous vein (SV) grafts) on the blood flow patterns and hemodynamic parameters (HPs). In this paper, the effects of the inner surface irregularities of a vein graft on the blood flow is investigated in the graft as well as in the distal anastomotic region, with a more realistic geometry of valve-stripped SV, by means of numerical simulation of pulsatile, Newtonian blood flow. The simulation results demonstrate that the valve remnants and sinuses cause disturbances in the flow field within the graft (due to vortices formation within the valve sinuses) and undesirable distribution of HPs, which can result in early atherosclerotic lesion development in the graft.
No takes yet. Share an insight, caveat, or question.
Kabinejadian et al. (2010) studied Coronary artery bypass grafts (CABG). Valve remnants and sinuses in vein grafts vs. Smooth tubes was evaluated on Blood flow patterns and hemodynamic parameters. Numerical simulation demonstrated that valve remnants and sinuses in vein grafts cause flow disturbances and undesirable hemodynamic parameter distributions, potentially leading to early atherosclerosis.
Synapse has enriched 10 related papers. Consider them for comparative context: