Study the Heart Valve Elasticity and Optimal of Vortex Formation for Blood Circulation Measurement on the Left Ventricle Using the Heart Simulator (Heart-S) Apparatus

Author(s):  
Mohd Azrul Hisham Mohd Adib ◽  
Nur Hazreen Mohd Hasni
Author(s):  
Loh Quo Liang ◽  
Kok Yin Hui ◽  
Nur Hazreen Mohd Hasni ◽  
Mohd Azrul Hisham Mohd Adib

Heart is a complex structure which acts as a blood pump in mammal’s body. It is important to have detail study for the heart structure. Modeling of heart structure gives a better understanding and figure of the heart valve’s movement as well as the fluid flow movement in the heart chamber. In this paper, the heart simulator (Heart-S) on the left ventricle for measuring the blood circulation during cardiac cycle was proposed. Throughout the experimental modeling of heart valve structure by using rhythmic fluid flow in a closed chamber, the relationship between heart valve elasticity and heart valve angle position to the valve opening width were investigated. The main aspect of the present development is to provide a heart simulator apparatus to obtain data for development of artificial heart and for observing the blood circulation measurement. The result shows good agreement on valve elasticity and the velocity of the fluid from the vortex in the heart chamber can be found after the experiment. The novelty of this development is contributing to the study of the optimal vortex formation in the heart chamber and observe the blood circulation measurement.


2019 ◽  
Vol 29 (09) ◽  
pp. 1206-1207
Author(s):  
Virginie Fouilloux ◽  
Philippe Aldebert ◽  
Guillaume Gorincour

AbstractVentricular pseudoaneurysm is a rare but well-known complication after valvular endocarditis. The lesion was localised exactly where pre-operative CT scan showed lack of enhancement in the postero-lateral wall of the left ventricle. This case demonstrates how much attention must be paid to myocardial CT images and emphazises the need of close follow-up in patients with infective endocartitis.


1988 ◽  
Vol 110 (4) ◽  
pp. 334-343 ◽  
Author(s):  
Martin Knoch ◽  
Helmut Reul ◽  
Ralf Kro¨ger ◽  
Gu¨nter Rau

In a 3:1 scaled model of the human aorta models of the Omniscience, Bjo¨rk-Shiley Convexo-Concave, Bjo¨rk-Shiley Monostrut, Medtronic-Hall, Duromedics (Hemex) and the Saint Jude Medical heart valve prostheses are studied in steady flow representing the systolic peak flow phase. Detailed flow visualization experiments show flow separations at all inner ring surfaces as well as at most of the occluders. The resulting stagnation areas increase the risk of thrombus accumulation. Flow separations also stimulate vortex formation and turbulent mixing at the downstream jet boundaries and thus may intensify blood damage by turbulent shear stresses. The different influences of struts and occluder guides on the flow around the occluders are discussed. The effects of the individual valve components on the flow fields are analyzed and correlated with the resulting pressure losses.


Author(s):  
О. П. Мазуренко ◽  
П. Надзякевич ◽  
О. А. Лоскутов ◽  
Л. В. Згржебловська

The work is devoted to the study of the blood coagulation system and the correction of its indicators with a personalized anticoagulant target therapy in the early postoperative period to ten patients with implanted left ventricle assist devices for mechanical circulation support in the Silesian Center Heart Diseases, according to a bilateral agreement with the National Medical Academy of Postgraduate Education named after P. Shupik. The study included ten patients who were implanted in the Silesian Center for Heart Disease from March 11, 2016 to Nov 22, 2017, devices for mechanical support of left ventricular circulation LVAD in the aftermath of the terminal stage of heart failure.The subjects were men 55 ± 13.5 years old, with a body mass index of 30.8 ± 8.3 and a body surface area of 2.12 ± 0.2 m2 with a left ventricular ejection fraction of 15.4 ± 9.5%, which was mechanically supported blood circulation in the period from 11.03.2016 to 22.11.2017 in conditions of artificial blood circulation and combined endotracheal anesthesia, five of which had implanted cardioverts-defibrillators.Patients were divided according to the INTERMAKS Level 1 (cardiogenic shock) - 6 (60% of cases), Level 2 (progressive circulatory failure) - 4 men (40% of cases). Patients in the early postoperative period that time received an anticoagulant target mono and combination therapy with heparin (6-11U / kg / h), Aspirin (75-150mg.), Clopidogrel (75-150mg.), Warfarin (1.5-7mg), Nadroparinum Ca(0.3-0.6 ml / 2p / d), Fondaparinux Na (2.5-5 mg / 2p / d). The duration of support - POLVAD ranged from 102 to 156 days. Results - transplanted 2, died 2. The studies revealed a non-linear relationship between mortality, the number of days of general and intensive therapy for hospitalization, the use of extracorporeal membrane oxygenation and intra-aortic membrane oxygenation in patients with implanted systems of mechanical blood circulation, who used large doses of catecholamines during the postoperative period.Analyzing the needs of patients with implanted mechanical systems to support the blood circulation of the left ventricle in blood donations, it should be noted that in the early postoperative period the erythrocyte mass was most often used. During surgery, fresh-frozen plasma was the drug of choice, while the platelet mass was used in most cases during the pre-operative preparation of the patient.The main complications that developed in patients with implanted mechanical support systems of the left ventricular blood circulation were: bleeding, thrombosis of the mechanical blood circulation systems, cerebral circulation disorders due to hemorrhagic and ischemic type, infectious complications.


Author(s):  
Siming Zhu ◽  
Shengli Jiang

Objectives: The study sought to examine the prognostic impact of valvular surgery in patients with severe dilated left ventricle(DL) and assess morphological and functional changes of DL in the early period after operation. Methods: From January 2013 to December 2018, at a single center, 126 patients with severe dilated left ventricle (DL group) and 511 patients with 511 patients with normal sized left ventricle (NL group) underwent heart valve surgery. Retrospective review of the procedure and the postoperative clinical course, including echocardiography were analyzed in 6 to 12-month follow up. Results: Compared with NL group, DL group had significantly higher postoperative all-cause mortality (3.2% vs 1.4%) and complication rate, as well as longer duration of mechanical ventilation and vasoactive agents support. In DL group, 4 (3.2%) patients died in the early postoperative stage among which 2 (1.6%) patients died from multiple organ failure (MOF) secondary to severe low-output syndrome, 2 (1.6%) patients died from ventricular fibrillation. The DL group had longer time of mechanical ventilation and vasoactive agents support than NL group postoperatively. In DL group, the progressive regression of end-diastole diameter (LVEDD) was observed during the follow-up; whereas left ventricular ejection function (LVEF) and left ventricular fractional shortening (LVFS) showed a temporary decrease in early postoperative stage and then improved gradually. Conclusion: Heart valve surgery performed in an experienced center, along with sophisticated perioperative management, could bring satisfying early outcomes to patients with severe dilated left ventricle.


Author(s):  
Olga Pierrakos ◽  
Pavlos P. Vlachos ◽  
Demetri P. Telionis ◽  
Saami Yazdani ◽  
Ali Etebari

Recent groundbreaking work by Kilner et al. [1] demonstrated that a healthy functioning heart redirects the flow through the left ventricle (LV) in an asymmetric manner, which results in an energy conserving mechanism. Heart valve replacement alters the physiological operation of the heart significantly affecting its hemodynamic performance. As a result, orientation and valve design could play a significant role in the energy efficient operation of the heart; therefore, orienting MHVs so that flow disturbances are minimized enhances the hemodynamic performance of the LV.


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