Study on the Accuracy of Structural and FSI Heart Valves Simulations

ConclusionIn this regard, our results indicate the quadrangular shell with reduced integration and viscous hourglass control to be the best choice to model heart valves. If a solid discretization is required, quadratic hexahedral elements with full integration are also acceptable. Finally, our results show that the damping coefficient needs to be carefully selected in order to smooth out the high frequency modes of the structure without introducing excessive numerical artificial viscosity.
Source: Cardiovascular Engineering and Technology - Category: Cardiology Source Type: research

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Abbott Laboratories is bringing two of its pediatric devices in the cardiology space to Europe. The Abbott Park, IL-based company has received CE mark for both the Masters HP 15mm rotatable mechanical heart valve and the Amplatzer Piccolo Occluder. The Masters valve is the world's smallest mechanical heart valve and allows doctors to treat babies and toddlers in need of a mitral or aortic heart valve replacement. Until Abbott's device, surgeons could only use a range of larger-sized valves to replace a pediatric heart valve that could not be repaired, which could result in improper fit and complications. The Masters pediat...
Source: MDDI - Category: Medical Devices Authors: Tags: Cardiovascular Source Type: news
FL Abstract This surgical heritage article provides a historical overview of the most important early advances of vascular- and valvular surgery, that lead to the development of currently used vascular- and valvular prostheses and materials. The first writings describing techniques in vascular surgery mainly focussed on haemorrhage control and date from around 1600 B.C. The strategy of vessel ligation was first mentioned in Western literature around 200 B.C. In the 18th century, techniques of ligation were expanded towards attempts of vessel restoration. The first artificial vascular prosthesis was made in 1894. ...
Source: The Journal of Cardiovascular Surgery - Category: Cardiovascular & Thoracic Surgery Authors: Tags: J Cardiovasc Surg (Torino) Source Type: research
AbstractPercutaneous mitral and tricuspid valve interventions are alternative treatment options for patients who are deemed to be at high surgical risk and/or inoperable. Transcatheter edge-to-edge mitral valve repair using the MitraClip and PASCAL system, which are designed to mimic the surgical Alfieri ’s stich, has changed the landscape for the treatment of symptomatic functional mitral regurgitation (MR). Previous studies have shown that the procedure can reduce symptoms and improve functional capacity with low rates of complication. Recently, two randomized controlled clinical trials have rep orted the effect of...
Source: Cardiovascular Intervention and Therapeutics - Category: Cardiology Source Type: research
ConclusionsSubstantial in vivo recellularization with noninflammatory cells was observed in this study. Spontaneous recellularization appears to require multiple months, which correspondingly has an impact on size selection for growing patients.
Source: The Annals of Thoracic Surgery - Category: Cardiovascular & Thoracic Surgery Source Type: research
Abstract Based on a longtime voluntary registry, founded by the German Society for Thoracic and Cardiovascular Surgery (GSTCVS), well-defined data of all cardiac, thoracic, and vascular surgery procedures performed in 78 German heart surgery departments during the year 2018 are analyzed. For this period, a total of 174,902 procedures were submitted to the registry, 98,707 summarized as heart surgery procedures in the classical meaning. The unadjusted in-hospital survival rate for 33,999 isolated coronary artery bypass grafting procedures (relationship on-/off-pump 3.8:1) was 97.1% and for 34,915 isolated heart val...
Source: The Thoracic and Cardiovascular Surgeon - Category: Cardiovascular & Thoracic Surgery Authors: Tags: Thorac Cardiovasc Surg Source Type: research
Thorac cardiovasc Surg DOI: 10.1055/s-0039-1693022Based on a longtime voluntary registry, founded by the German Society for Thoracic and Cardiovascular Surgery (GSTCVS), well-defined data of all cardiac, thoracic, and vascular surgery procedures performed in 78 German heart surgery departments during the year 2018 are analyzed. For this period, a total of 174,902 procedures were submitted to the registry, 98,707 summarized as heart surgery procedures in the classical meaning. The unadjusted in-hospital survival rate for 33,999 isolated coronary artery bypass grafting procedures (relationship on-/off-pump 3.8:1) was 97.1% a...
Source: The Thoracic and Cardiovascular Surgeon - Category: Cardiovascular & Thoracic Surgery Authors: Tags: Original Cardiovascular Source Type: research
, Cerşit S, Özkan M Abstract The past 65 years have witnessed remarkable progress in the development of safe, hemodynamically favorable mechanical heart valves. Today, there are a large number and variety of prostheses in use and many prostheses have been used for a while and then discontinued. When patients lack reliable information about their heart valve prostheses, identification of valve model becomes difficult even for specialized physicians in this area. A combination of cinefluoroscopy and echocardiography makes it possible to provide accurate and detailed information regarding identification ...
Source: The International Journal of Artificial Organs - Category: Transplant Surgery Authors: Tags: Int J Artif Organs Source Type: research
(Concordia University) Using high-tech equipment to look at the flow downstream of a bi-leaflet mechanical heart valve, researchers at Concordia have devised a technique to detect obstructions in a type of mechanical heart valve they believe will contribute to safer follow-up methods for cardiologists and their patients.
Source: EurekAlert! - Medicine and Health - Category: International Medicine & Public Health Source Type: news
AbstractMucopolysaccharidoses (MPS) are inborn errors of metabolism produced by a deficiency of one of the enzymes involved in the degradation of glycosaminoglycans (GAGs). Although taken separately, each type is rare. As a group, MPS are relatively frequent, with an overall estimated incidence of around 1 in 20,000 –25,000 births. Development of therapeutic options for MPS, including hematopoietic stem cell transplantation (HSCT) and enzyme replacement therapy (ERT), has modified the natural history of many MPS types. In spite of the improvement in some tissues and organs, significant challenges remain unsol ved, in...
Source: Drugs - Category: Drugs & Pharmacology Source Type: research
[News24Wire] Surgeons in Italy have made a rare discovery while operating on a 60-year-old woman - an artificial mitral valve that is almost 50 years old, and still working perfectly.
Source: AllAfrica News: Health and Medicine - Category: African Health Source Type: news
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