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https://www.readbyqxmd.com/read/29060112/synergy-of-first-principles-modelling-with-predictive-control-for-a-biventricular-assist-device-in-silico-evaluation-study
#1
Vivian C A Koh, Yong Kuen Ho, Michael C Stevens, Robert F Salamonsen, Nigel H Lovell, Einly Lim
Control for dual rotary left ventricular assist devices (LVADs) used as a biventricular assist device (BiVAD) is challenging. If the control system fails, flow imbalance between the systemic and the pulmonary circulations would result, subsequently leading to ventricular suction or pulmonary congestion. With the expectation that advanced control approaches such as model predictive control could address the challenges naturally and effectively, we developed a synergistic first principles model predictive controller (MPC) for the BiVAD...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28949079/clinical-outcomes-of-temporary-mechanical-circulatory-support-as-a-direct-bridge-to-heart-transplantation-a-nationwide-spanish-registry
#2
Eduardo Barge-Caballero, Luis Almenar-Bonet, Francisco Gonzalez-Vilchez, José L Lambert-Rodríguez, José González-Costello, Javier Segovia-Cubero, María A Castel-Lavilla, Juan Delgado-Jiménez, Iris P Garrido-Bravo, Diego Rangel-Sousa, Manuel Martínez-Sellés, Luis De la Fuente-Galan, Gregorio Rábago-Juan-Aracil, Marisa Sanz-Julve, Daniela Hervás-Sotomayor, Sonia Mirabet-Pérez, Javier Muñiz, María G Crespo-Leiro
BACKGROUND: In Spain, listing for high-urgent heart transplantation is allowed for critically ill candidates not weanable from temporary mechanical circulatory support (T-MCS). We sought to analyse the clinical outcomes of this strategy. METHODS AND RESULTS: We conducted a case-by-case, retrospective review of clinical records of 291 adult patients listed for high-urgent heart transplantation under temporary devices from 2010 to 2015 in 16 Spanish institutions. Survival after listing and adverse clinical events were studied...
September 26, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28938308/sensor-based-physiologic-control-strategy-for-biventricular-support-with-rotary-blood-pumps
#3
Yu Wang, Steven C Koenig, Zhongjun Wu, Mark S Slaughter, Guruprasad A Giridharan
Rotary biventricular assist devices (BiVAD) are becoming a clinically accepted treatment option for end-stage biventricular failure. To improve BiVAD efficacy and safety, we propose a control algorithm to achieve the clinical objectives of maintaining left-right-sided balance, restoring physiologic flows, and preventing ventricular suction. The control algorithm consists of two proportional-integral (PI) controllers for left and right ventricular assist devices (LVAD and RVAD) to maintain differential pump pressure across LVAD (ΔPL) and RVAD (ΔPR) to provide left-right balance and physiologic flow...
September 21, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28906273/utilization-and-outcomes-of-temporary-mechanical-circulatory-support-for-graft-dysfunction-after-heart-transplantation
#4
Kevin Phan, Jessica G Y Luc, Joshua Xu, Simon Maltais, John M Stulak, Tristan D Yan, Vakhtang Tchantchaleishvili
Graft dysfunction is the main cause of early mortality after heart transplantation. In cases of severe graft dysfunction, temporary mechanical circulatory support (TMCS) may be necessary. The aim of this systematic review was to examine the utilization and outcomes of TMCS in patients with graft dysfunction after heart transplantation. Electronic search was performed to identify all studies in the English literature assessing the use of TMCS for graft dysfunction. All identified articles were systematically assessed for inclusion and exclusion criteria...
November 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28905470/outcomes-of-berlin-heart-excor-%C3%A2-pediatric-ventricular-assist-device-support-in-patients-with-restrictive-and-hypertrophic-cardiomyopathy
#5
Jennifer A Su, Jondavid Menteer
The outcomes of pediatric ventricular assist device support in patients with diastolic heart failure have not been well described. This study reviews the North American experience with Berlin Heart EXCOR(®) ventricular assist device implants in children with such physiology. The Berlin Heart clinical database was reviewed. Patients with primary diastolic dysfunction are included in this study. Twenty pediatric patients with restrictive cardiomyopathy (n = 13), hypertrophic cardiomyopathy (n = 3), or congenital heart disease with restrictive physiology (n = 4) who were supported with EXCOR(®) were identified...
September 14, 2017: Pediatric Transplantation
https://www.readbyqxmd.com/read/28841580/durable-biventricular-support-using-right-atrial-placement-of-the-heartware-hvad
#6
Hao A Tran, Travis L Pollema, Jorge Silva Enciso, Barry H Greenberg, Denise D Barnard, Eric D Adler, Victor G Pretorius
Patients with Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS) levels 1-2 who either have or are at risk for right ventricular failure face significant morbidity and mortality after continuous flow left ventricular assist device (CF-LVAD) implantation. Currently, the options for biventricular support are limited the Total Artificial Heart (TAH; CardioWest, Syncardia, Tuscon, AZ) or biventricular assist device (BiVAD), which uses bulky extracorporeal or implantable displacement pumps...
August 23, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28651347/minimally-invasive-centrimag-ventricular-assist-device-support-integrated-with-extracorporeal-membrane-oxygenation-in-cardiogenic-shock-patients-a-comparison-with-conventional-centrimag-biventricular-support-configuration
#7
Koji Takeda, Arthur R Garan, Masahiko Ando, Jiho Han, Veli K Topkara, Paul Kurlansky, Melana Yuzefpolskaya, Maryjane A Farr, Paolo C Colombo, Yoshifumi Naka, Hiroo Takayama
OBJECTIVES: We recently developed a novel minimally invasive surgical approach that combines extracorporeal membrane oxygenation and CentriMag ventricular assist device (Ec-VAD) for the treatment of cardiogenic shock as a short-term circulatory support. We compared the outcomes of this new approach to conventional CentriMag biventricular assist device (BiVAD) support through a median sternotomy. METHODS: Between July 2015 and August 2016, 22 patients were implanted with CentriMag Ec-VAD and 90 patients were implanted with conventional CentriMag BiVAD...
June 22, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28567581/temporary-biventricular-support-with-extracorporeal-membrane-oxygenation-a-feasible-therapeutic-approach-for-cardiogenic-shock-with-multiple-organ-failure
#8
Osamu Seguchi, Tomoyuki Fujita, Takuya Watanabe, Kensuke Kuroda, Eriko Hisamatsu, Seiko Nakajima, Takuma Sato, Haruki Sunami, Masanobu Yanase, Hiroki Hata, Junjiro Kobayashi, Takeshi Nakatani, Norihide Fukushima
Various strategies using a ventricular assist device (VAD) are applied to rescue Interagency Registry for Mechanically Assisted Circulatory Support profile 1 (Profile-1) patients. However, the optimal use of VAD in Profile-1 patients has not been completely elucidated. We retrospectively reviewed 23 Profile-1 patients [mean age 36.9 ± 16.6 years, 14 males; 11 with non-ischemic cardiomyopathy (NICM), 9 with fulminant myocarditis (FM), 2 with ischemic cardiomyopathy (ICM), and 1 with peripartum cardiomyopathy (PPCM); 18 with pre-operative percutaneous extracorporeal membrane oxygenation (p-ECMO) support] who underwent VAD implantation from 2011 to 2015 at our institution...
May 31, 2017: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/28509675/acute-and-long-term-effects-of-left-ventricular-assist-device-support-on-right-ventricular-function-in-children-with-pediatric-pulsatile-ventricular-assist-devices
#9
Roberta Iacobelli, Arianna Di Molfetta, Gianluca Brancaccio, Sergio Filippelli, Stefano Morelli, Benedetta Natali, Alessandra Toscano, Fabrizio Drago, Antonio Amodeo
Right ventricular failure (RVF) is a significant issue when considering left ventricular assist device (LVAD) implantation in pediatrics. The aim of this study was to evaluate the effects of LVAD on right ventricular (RV) function in children. We retrospectively reviewed clinical and echocardiographic data of children who underwent Berlin Heart EXCOR LVAD focusing on RV function before and after implantation (1, 3, and 6 month follow-up). An isolated LVAD was used in 27 patients. Median age was 11 months (interquartile range [IQR]: 5-24 months), with a median weight of 6...
May 12, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28365175/outcomes-following-implantation-of-mechanical-circulatory-support-in-adults-with-congenital-heart-disease-an-analysis-of-the-interagency-registry-for-mechanically-assisted-circulatory-support-intermacs
#10
Christina J VanderPluym, Ari Cedars, Pirooz Eghtesady, Bryan G Maxwell, Jill M Gelow, Luke J Burchill, Simon Maltais, Devin A Koehl, Ryan S Cantor, Elizabeth D Blume
BACKGROUND: Adults with congenital heart disease represent an expanding and unique population of patients with heart failure (HF) in whom the use of mechanical circulatory support (MCS) has not been characterized. We sought to describe overall use, patient characteristics, and outcomes of MCS in adult congenital heart disease (ACHD). METHODS: All patients entered into the Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS) between June 23, 2006, and December 31, 2015, were included...
March 7, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28325006/a-simplified-state-space-model-of-biventricular-assist-device-cardiovascular-system-interaction
#11
Vivian C A Koh, Einly Lim, Boon Chiang Ng, Yong Kuen Ho, Nigel H Lovell
A simplified state-space model of biventricular assist device (BiVAD)-cardiovascular system (CVS) interaction is presented. The state-space equations includes a six-compartments CVS model incorporating the ventricles, the pulmonary and systemic circulations as well as the non-linear behavior of the valve flow, together with a left ventricular assist device (LVAD) and a right ventricular assist device (RVAD) component. The left and right pump speeds serve as the input variables for the state-space model. The model is simulated with three operational modes, i...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28319524/combined-therapy-of-ventricular-assist-device-and-membrane-oxygenator-for-profound-acute-cardiopulmonary-failure
#12
Kevin Fujita, Koji Takeda, Boyangzi Li, Christine Mauro, Paul Kurlansky, Sowmyashree Sreekanth, Jiho Han, Lauren K Truby, A Reshad Garan, Veli Topkara, Melana Yuzefpolskaya, Paolo Colombo, Yoshifumi Naka, Hiroo Takayama
Short-term ventricular assist devices (ST-VADs) have been effective in treating the patients with refractory cardiogenic shock. Membrane oxygenators (MOs) can be added to the circuit for concomitant, profound refractory hypoxia. This study reports the outcomes of combined therapy in this portion of patients. This is a retrospective review of 166 patients who received an ST-biventricular assist device (BiVAD) or right ventricular assist device (RVAD) for cardiogenic shock between November 2007 and November 2014...
November 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28281287/application-of-a-lumped-parameter-model-to-study-the-feasibility-of-simultaneous-implantation-of-a-continuous-flow-ventricular-assist-device-vad-and-a-pulsatile-flow-vad-in-bivad-patients
#13
Arianna Di Molfetta, Gianfranco Ferrari, Roberta Iacobelli, Sergio Filippelli, Libera Fresiello, Paolo Guccione, Alessandra Toscano, Antonio Amodeo
The aim of this work is to develop and test a lumped parameter model of the cardiovascular system to simulate the simultaneous use of pulsatile (P) and continuous flow (C) ventricular assist devices (VADs) on the same patient. Echocardiographic and hemodynamic data of five pediatric patients undergoing VAD implantation were retrospectively collected and used to simulate the patients' baseline condition with the numerical model. Once the baseline hemodynamic was reproduced for each patient, the following assistance modalities were simulated: (a) CVAD assisting the right ventricle and PVAD assisting the left ventricle (RCF + LPF), (b) CVAD assisting the left ventricle and PVAD assisting the right ventricle (LCF + RPF)...
March 2017: Artificial Organs
https://www.readbyqxmd.com/read/28227467/a-simplified-state-space-model-of-biventricular-assist-device-cardiovascular-system-interaction
#14
Vivian C A Koh, Einly Lim, Boon Chiang Ng, Yong Kuen Ho, Nigel H Lovell, Vivian C A Koh, Einly Lim, Boon Chiang Ng, Yong Kuen Ho, Nigel H Lovell, Boon Chiang Ng, Einly Lim, Vivian C A Koh, Nigel H Lovell, Yong Kuen Ho
A simplified state-space model of biventricular assist device (BiVAD)-cardiovascular system (CVS) interaction is presented. The state-space equations includes a six-compartments CVS model incorporating the ventricles, the pulmonary and systemic circulations as well as the non-linear behavior of the valve flow, together with a left ventricular assist device (LVAD) and a right ventricular assist device (RVAD) component. The left and right pump speeds serve as the input variables for the state-space model. The model is simulated with three operational modes, i...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28033201/right-ventricular-failure-post-lvad-implantation-corrected-with-biventricular-support-an-in-vitro-model
#15
Sajad Shehab, Sabine M Allida, Patricia M Davidson, Phillip J Newton, Desiree Robson, Paul C Jansz, Christopher S Hayward
Right ventricular failure after left ventricular assist device (LVAD) implantation is associated with high mortality. Management remains limited to pharmacologic therapy and temporary mechanical support. Delayed right ventricular assist device (RVAD) support after LVAD implantation is associated with poorer outcomes. With the advent of miniaturized, durable, continuous flow ventricular assist device systems, chronic RVAD and biventricular assist device (BiVAD) support has been used with some success. The purpose of this study was to assess combined BiVAD and LVAD with delayed RVAD support within a four-elemental mock circulatory loop (MCL) simulating the human cardiovascular system...
January 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28009713/outcomes-and-trends-of-ventricular-assist-device-selection-in-children-with-end-stage-heart-failure
#16
Jacob R Miller, Timothy S Lancaster, Deirdre J Epstein, Nicholas C DuPont, Kathleen E Simpson, Chesney Castleberry, Charles E Canter, Pirooz Eghtesady, Umar S Boston
We aimed to examine trends in ventricular assist device (VAD) selection, continuous flow devices (CFD) versus pulsatile flow devices (PFD), and their associated outcomes in children eligible for both device types. To accomplish this, the United Network for Organ Sharing database was reviewed for pediatric patients listed for heart transplant (HT) from January 2007 to June 2014. Patients were included if a durable VAD was present at wait listing or when removed from the waiting list and who met size eligibility for a CFD (BSA > 1...
July 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/27999550/the-use-of-berlin-heart-excor-vad-in-children-less-than-10-kg-a-single-center-experience
#17
Arianna Di Molfetta, Fabrizio Gandolfo, Sergio Filippelli, Gianluigi Perri, Luca Di Chiara, Roberta Iacobelli, Rachele Adorisio, Isabella Favia, Alessandra Rizza, Giuseppina Testa, Matteo Di Nardo, Antonio Amodeo
Objective: Despite the improvement in ventricular assist device (VAD) therapy in adults and in adolescents, in infant population only Berlin Heart EXCOR (BHE) is licensed as long term VAD to bridge children to Heart Transplantation (HTx). Particularly demanding in terms of morbidity and mortality are smallest patients namely the ones implanted in the first year of life or with a lower body surface area. This work aims at retrospective reviewing a single center experience in using BHE in children with a body weight under 10 kg...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27851282/1647-giant-cell-myocarditis-destination-therapy-with-hvad-bivad
#18
Laura Lombardi-Karl, Jonathan Hastie
No abstract text is available yet for this article.
December 2016: Critical Care Medicine
https://www.readbyqxmd.com/read/27821152/a-20-year-multicentre-outcome-analysis-of-salvage-mechanical-circulatory-support-for-refractory-cardiogenic-shock-after-cardiac-surgery
#19
MULTICENTER STUDY
Maziar Khorsandi, Scott Dougherty, Andrew Sinclair, Keith Buchan, Fiona MacLennan, Omar Bouamra, Philip Curry, Vipin Zamvar, Geoffrey Berg, Nawwar Al-Attar
BACKGROUND: Refractory post-cardiotomy cardiogenic shock (PCCS) is a relatively rare phenomenon that can lead to rapid multi-organ dysfunction syndrome and is almost invariably fatal without advanced mechanical circulatory support (AMCS), namely extra-corporeal membrane oxygenation (ECMO) or ventricular assist devices (VAD). In this multicentre observational study we retrospectively analyzed the outcomes of salvage venoarterial ECMO (VA ECMO) and VAD for refractory PCCS in the 3 adult cardiothoracic surgery centres in Scotland over a 20-year period...
November 8, 2016: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/27748657/myocardial-recovery-in-peripartum-cardiomyopathy-after-hyperprolactinemia-treatment-on-bivad
#20
Dominik Wiedemann, Thomas Schlöglhofer, Julia Riebandt, Markus Neuner, Edda Tschernko, Heinrich Schima, Daniel Zimpfer
Peripartum cardiomyopathy (PPCMP) requiring mechanical circulatory support is rare; however, it is a life-threatening disease with recovery rates poorer than expected. Herein, we describe a case of successful recovery of a patient with PPCMP. Implantation of a biventricular ventricular assist device was performed; additionally, the patient's hyperprolactinemia was treated with cabergoline, resulting in a fast complete restoration of ventricular function.
January 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
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