Publications by authors named "Sang-Ho Suh"
Article Synopsis
- * The study investigated how different lipid cores and varying blood vessel thicknesses affect the behavior of atherosclerotic plaque rupture using Fluid-Structure Interaction (FSI) simulations.
- * Findings indicated that blood vessels with lipid core plaques experience higher stress levels, and thinner vessels are more prone to rupture due to significant stress, especially in cellular plaques.
Objective: The objective of this study was to investigate the effects of miniscrew-assisted rapid palatal expansion (MARPE) on changes in airflow in the upper airway (UA) of an adult patient with obstructive sleep apnea syndrome (OSAS) using computational fluid-structure interaction analysis.
Methods: Three-dimensional UA models fabricated from cone beam computed tomography images obtained before (T0) and after (T1) MARPE in an adult patient with OSAS were used for computational fluid dynamics with fluid-structure interaction analysis. Seven and nine cross-sectional planes (interplane distance of 10 mm) in the nasal cavity (NC) and pharynx, respectively, were set along UA.
Article Synopsis
- The ureter allows urine to travel from the kidneys to the bladder, with flow aided by peristalsis and hydrostatic pressure.
- Ureteral diseases and the use of double J stents can disrupt normal urine flow, leading to various shapes of the ureter, like a tube or funnel.
- This study created models of differently shaped ureters to analyze how their shapes and the presence of stents affect urine flow rates and patterns.
Article Synopsis
- * A study explored the impact of side holes in double J stents on urine flow, specifically using models that mimic human anatomy instead of straight ureters.
- * Findings revealed that side holes improved urine flow rates in cases of ureteral stenosis, particularly as the severity of the stenosis increased, although their angular positioning did not influence the flow rates.
Article Synopsis
- The study compared two surgical techniques (conventional MMA and modified MMA-ASSO) for treating obstructive sleep apnea syndrome (OSAS) using advanced 3D airflow analysis.
- Two male patients with OSAS underwent these techniques, and their airway changes were evaluated before and after surgery using computed tomography and polysomnography.
- Results showed that both methods improved airway function, but the modified MMA-ASSO provided greater benefits in reducing apnea episodes and enhancing airflow dynamics, suggesting it as a promising option for treatment.
Article Synopsis
- A double J stent is commonly used for patients with ureteral stenosis or kidney stones, featuring multiple side holes for urine flow.
- Research evaluated the flow rate and patterns around these side holes using models that mimic both curved and straight ureters.
- Results showed that stents with more side holes had higher total flow rates and that the curved ureter model demonstrated more active inflow and outflow compared to straight models, indicating flow occurs even without obstructions.
Article Synopsis
- - Ureteral stenosis can obstruct urine flow and lead to renal failure, with ureteral stents used to alleviate this issue by enabling urine to flow more freely in the upper urinary tract.
- - The insertion of a stent can weaken ureteral peristalsis over time, causing the ureter to appear tubular and curved rather than functioning normally.
- - A study involving 12 stent models (six curved and six straight) highlighted that curved stent designs, which mimic human anatomy, are more effective for simulating and improving urine flow in computational fluid dynamics (CFD) evaluations.
Influences of Geometric Configurations of Bypass Grafts on Hemodynamics in End-to-Side Anastomosis.
Korean J Thorac Cardiovasc Surg
April 2011
Background: Although considerable efforts have been made to improve the graft patency in coronary artery bypass surgery, the role of biomechanical factors remains underrecognized. The aim of this study is to investigate the influences of geometric configurations of the bypass graft on hemodynamic characteristics in relation to anastomosis.
Materials And Methods: The Numerical analysis focuses on understanding the flow patterns for different values of inlet and distal diameters and graft angles.
The present study in angulated coronary stenosis used human in vivo hemodynamic parameters and computed simulation, both qualitatively and qualitatively, to evaluate the influence of flow velocity and wall shear stress (WSS) on coronary atherosclerosis, the changes of hemodynamic indices following coronary stenting, and their effect on evolving in-stent restenosis. Initial and follow-up coronary angiographies in patients with angulated coronary stenosis were performed (n=60). The optimal degree of coronary stenting for angulated coronary stenosis had two models, the less than 50% angle changed group (model 1, n=33) and the more than 50% angle changed group (model 2, n=27).
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