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Three ‐Dimensional Numerical Simulations of Aspiration Process: Evaluation of Two Penumbra Aspiration Catheters Performance
AbstractAcute ischemic stroke (AIS) is the leading cause of mortality and disability worldwide. AIS occur while cerebral arteries become blocked by embolism or thrombosis. Aspiration thrombectomy is a promising interventional device to extract massive clots from occluded cerebral arteries. The aim of this article is to develop a computer ‐aided method to clarify the performance of aspiration catheter and identify the risks of aspiration for each specific AIS patient. In order to simulate the aspiration process, a three‐dimensional fluid‐structure interaction (FSI) method was developed. The blood clot was modeled as a...
Source: Artificial Organs - November 15, 2018 Category: Transplant Surgery Authors: Alireza Chitsaz, Amir Nejat, Reza Nouri Tags: Main Text Article Source Type: research

Experimental Investigation of Left Ventricular Flow Patterns After Percutaneous Edge ‐to‐Edge Mitral Valve Repair
Abstract Mitral valve percutaneous edge‐to‐edge repair (PEtER) is a viable solution in high‐risk patients with severe symptomatic mitral regurgitation. However, the generated double‐orifice configuration poses challenges for the evaluation of the hemodynamic performance of the mitral valve and may alter flow patterns in the left ventricle (LV) during diastole. This in vitro study aims to evaluate the hemodynamic modifications following a simulated PEtER. A custom‐made mitral valve was developed, and two configurations were tested: (i) a single‐orifice valve with mitral regurgitation and (ii) a double‐orifice ...
Source: Artificial Organs - November 1, 2017 Category: Transplant Surgery Authors: Morteza Jeyhani, Shahrokh Shahriari, Michel Labrosse Tags: Main Text Source Type: research

Use of Left Ventricular Assist Device (HeartMate II): A Singapore Experience
We report our experience with the HeartMate II (HMII) LVAD (Thoratec Corporation, Pleasanton, CA, USA) as a bridge‐to‐heart transplant in our center from 2009 to 2012. This was a retrospective review of 23 consecutive patients who underwent HMII LVAD implantation in our center between May 2009 and December 2012. All patients were classified as Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS) levels 1 to 3 and underwent LVAD implantation as a bridge‐to‐heart transplant. There were 17 male and 6 female patients. The mean age was 43.6 years old (range 14 to 64). The etiologies of heart fa...
Source: Artificial Organs - January 7, 2014 Category: Transplant Surgery Authors: Choon Pin Lim, Cumaraswamy Sivathasan, Teing Ee Tan, Chong Hee Lim, Ka Lee Kerk, David Kheng Leng Sim Tags: Main Text Article Source Type: research

Impact of Pump Replacement on Outcome in Advanced Heart Failure Patients With Left Ventricular Assist System
In conclusion, pump replacement for thrombus formation may have a strong association with worse outcome. Our results reconfirm the clinical importance of device thrombus in the management of LVAS.
Source: Artificial Organs - May 20, 2013 Category: Transplant Surgery Authors: Yoshio Iwashima, Masanobu Yanase, Takeshi Horio, Osamu Seguchi, Yoshihiro Murata, Tomoyuki Fujita, Koichi Toda, Yuhei Kawano, Takeshi Nakatani Tags: Main Text Article Source Type: research

Evaluation of Inflow Cannulation Site for Implantation of Right‐Sided Rotary Ventricular Assist Device
Abstract Right heart dysfunction is one of the most serious complications following implantation of a left ventricular assist device, often leading to the requirement for short‐ or long‐term right ventricular assist device (RVAD) support. The inflow cannulation site induces major hemodynamic changes and so there is a need to optimize the site used depending on the patient's condition. Therefore, this study evaluated and compared the hemodynamic influence of right atrial cannulation (RAC) and right ventricular cannulation (RVC) inflow sites. An in vitro variable heart failure mock circulation loop was used to compare RA...
Source: Artificial Organs - April 29, 2013 Category: Transplant Surgery Authors: Shaun D. Gregory, Mark J. Pearcy, John Fraser, Daniel Timms Tags: Main Text Article Source Type: research