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left ventricular assist device

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https://www.readbyqxmd.com/read/28738087/exercise-physiology-with-a-left-ventricular-assist-device-analysis-of-heart-pump-interaction-with-a-computational-simulator
#1
Libera Fresiello, Frank Rademakers, Piet Claus, Gianfranco Ferrari, Arianna Di Molfetta, Bart Meyns
Patients with a Ventricular Assist Device (VAD) are hemodynamically stable but show an impaired exercise capacity. Aim of this work is to identify and to describe the limiting factors of exercise physiology with a VAD. We searched for data concerning exercise in heart failure condition and after VAD implantation from the literature. Data were analyzed by using a cardiorespiratory simulator that worked as a collector of inputs coming from different papers. As a preliminary step the simulator was used to reproduce the evolution of hemodynamics from rest to peak exercise (ergometer cycling) in heart failure condition...
2017: PloS One
https://www.readbyqxmd.com/read/28734595/arrhythmias-after-left-ventricular-assist-device-implantation-incidence-and-management
#2
REVIEW
Anis J Kadado, Joseph G Akar, James P Hummel
The use of mechanical circulatory support has become an increasingly common practice in patients with heart failure, whether used as bridge to transplantation or as destination therapy. The last couple of decades has seen a drastic change in the functioning of the left ventricular assist devices (LVAD), changing from the first generation devices running on pulsatile flow to the current continuous flow devices. Atrial and ventricular arrhythmias are common among heart failure patients, and though the systematic circulation is well supported in patients on mechanical circulatory support, these arrhythmias can still be the cause of detrimental symptoms and lead to potentially fatal outcomes...
July 10, 2017: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28734448/alternative-strategy-for-biventricular-assist-device-in-an-infant-with-hypertrophic-cardiomyopathy
#3
John C Dykes, Olaf Reinhartz, Christopher S Almond, Vamsi Yarlagadda, Jenna Murray, David N Rosenthal, Katsuhide Maeda
We report an infant with hypertrophic cardiomyopathy who underwent biventricular assist device placement with two 15-mL Berlin Heart EXCOR pediatric ventricular assist devices using an alternative atrial cannulation strategy. The systemic circulation was supported by left atrium (LA) to aorta cannulation. The LA was accessed through the right atrium by extending a 6-mm EXCOR cannula with a Gore-Tex graft connected to an atrial septal defect. The pulmonary circulation was supported with cannulation of the right atrium to pulmonary artery...
August 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28734440/use-of-mechanical-circulatory-support-in-isolated-right-heart-failure-a-bridge-to-transplantation
#4
Daniel J Beissel, Brian F Birnbaum, Aliessa P Barnes, James E O'Brien, Elizabeth M Turk, James D St Louis
Acute myocarditis may lead to left ventricular dysfunction and subsequent need for cardiac transplantation. We describe a 15-month-old child who presented with right heart failure of unclear cause. Echocardiography showed normal left ventricular function; however, right ventricular function was markedly reduced. The patient required extracorporeal membrane oxygenation followed by placement of a right-sided Berlin EXCOR ventricular assist device. There was little recovery, and the child underwent cardiac transplantation...
August 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28734437/two-pumps-for-single-ventricle-mechanical-support-for-establishment-of-biventricular-circulation
#5
Stanislav Ovroutski, Oliver Miera, Thomas Krabatsch, Felix Berger, Joachim Photiadis, Evgenii Potapov
A 31-year-old patient with a univentricular heart and double-inlet left ventricle, moderate pulmonary stenosis, and severe mitral valve regurgitation experienced irreversible heart failure after mitral valve replacement. "Biventricular" mechanical circulatory support was initiated. The systemic circulation was supported using the HeartWare ventricular assist device (HVAD) (HeartWare, Framingham, MA) pump in the usual manner. The second pump was inserted into the right atrium and connected to the pulmonary artery after closure of the pulmonary valve and atrial separation...
August 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28733693/asia-s-first-minimal-access-left-ventricular-assist-device-implantation
#6
Jia Lin Soon, Teing Ee Tan, Choon Pin Lim, David Kl Sim, Hazel Sp Chan, Ka Lee Kerk, Cumaraswamy Sivathasan
No abstract text is available yet for this article.
June 2017: Annals of the Academy of Medicine, Singapore
https://www.readbyqxmd.com/read/28731484/cpr-ecls-bvad-and-successful-heart-transplantation-within-2-months-a-single-centre-case-series-in-two-young-high-urgency-listed-patients
#7
Anna K Schmidt, Diyar Saeed, Arash Mehdiani, Bozena Sowinski, Ralf Westenfeld, Payam Akhyari, Artur Lichtenberg, Udo Boeken
INTRODUCTION: In times of organ shortage, death while on the heart waiting-list still represents a major problem. As a consequence, bridging to transplant as well as the decision when to escalate therapy play a very important role. METHODS AND RESULTS: We report on two young patients with dilated cardiomyopathy and acute decompensation who were successfully bridged to heart transplantation with both left and temporary right ventricular assist devices in just 2 months...
July 20, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28730986/long-term-use-of-left-ventricular-assist-devices-a-report-on-clinical-outcomes
#8
Sneha Raju, Jane MacIver, Farid Foroutan, Carolina Alba, Filio Billia, Vivek Rao
BACKGROUND: The literature examining clinical outcomes and readmissions during extended (> 1 yr) left ventricular assist device (LVAD) support is scarce, particularly in the era of continuous-flow LVADs. METHODS: We completed a retrospective cohort study on consecutive LVAD patients from June 2006 to March 2015, focusing on those who received more than 1 year of total LVAD support time. Demographic characteristics, clinical outcomes and readmissions were analyzed using standard statistical methods...
August 2017: Canadian Journal of Surgery. Journal Canadien de Chirurgie
https://www.readbyqxmd.com/read/28730501/the-pseudo-sah-sign-an-imaging-pitfall-in-postmortem-computed-tomography
#9
Go Shirota, Wataru Gonoi, Masako Ikemura, Masanori Ishida, Yukako Shintani, Hiroyuki Abe, Masashi Fukayama, Tomohiko Higashida, Hidemi Okuma, Osamu Abe
Postmortem computed tomography (PMCT) of the brain has an important role in detection of subarachnoid hemorrhage (SAH), which has a high mortality rate. However, a phenomenon known as "pseudo-SAH," or high-attenuation areas along the cisterns mimicking SAH, may be seen on CT. The aim of this study was to evaluate the diagnostic accuracy of brain PMCT for SAH and to identify the characteristics of pseudo-SAH. Findings on PMCT (sulcal effacement, asymmetry, maximum thickness of SAH signs, presence of acute/subacute intraventricular/intraparenchymal hemorrhage) and clinical history (left ventricular assist device [LVAD] implantation, anticoagulation therapy/coagulation disorder, global ischemia) were compared between subjects with true SAH and those with pseudo-SAH...
July 20, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28729354/continuous-flow-lvad-support-causes-a-distinct-form-of-intestinal-angiodysplasia
#10
Jooeun Kang, Samson Hennessy-Strahs, Pawel Kwiatkowski, Christian Bermudez, Michael A Acker, Pavan Atluri, Patrick McConnell, Carlo R Bartoli
Rationale: The objective of this autopsy study was to determine whether abnormal gastrointestinal vascularity develops during continuous-flow LVAD support. Objective: Left ventricular assist device (LVAD) support causes pathologic degradation of von Willebrand factor (vWF) and bleeding from gastrointestinal angiodysplasia at an alarming rate. It has been speculated that LVAD support, itself may cause angiodysplasia. The relationship to abnormal vWF metabolism is unknown. We tested the hypothesis that abnormal gastrointestinal vascularity develops during continuous-flow LVAD support...
July 20, 2017: Circulation Research
https://www.readbyqxmd.com/read/28727672/cardiac-rehabilitation-in-patients-with-left-ventricular-assist-device-a-systematic-review-and-meta-analysis
#11
Toufik Mahfood Haddad, Alok Saurav, Aiman Smer, Muhammad S Azzouz, Abhilash Akinapelli, Mark A Williams, Venkata M Alla
PURPOSE: Exercise-based cardiac rehabilitation (EBCR) has been demonstrated to improve functional capacity in heart failure (HF). However, there are limited data on the effect of EBCR in patients with advanced HF and left ventricular assist devices (LVADs). This meta-analysis sought to evaluate the effects of EBCR on functional capacity in patients with LVAD. METHODS: PubMed, Web of Science, CINAHL, and Cochrane Library databases were searched for randomized studies assessing the impact of EBCR in patients following LVAD implantation compared with standard therapy (ST)...
July 19, 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
https://www.readbyqxmd.com/read/28712955/clinical-impact-of-changes-in-hemodynamic-indices-of-contractile-function-during-treatment-of-acute-decompensated-heart-failure
#12
Kenneth C Bilchick, Eliany Mejia-Lopez, Peter McCullough, Khadijah Breathett, Jamie L Kennedy, Jose Tallaj, James Bergin, Salpy Pamboukian, Mohammad Abuannadi, Sula Mazimba
BACKGROUND: The objective was to determine the impact of improving right ventricular versus left ventricular stroke work indices (RVSWI v. LVSWI) during therapy for acute decompensated heart failure (ADHF). METHODS AND RESULTS: Cox proportional hazards regression and logistic regression was used to analyze key factors associated with outcomes in 175 patients (age 56.7 ± 13.6 years, 29.1% female) with hemodynamic data from the Evaluation Study of Congestive Heart Failure and Pulmonary Artery Catheterization Effectiveness (ESCAPE) trial...
July 13, 2017: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/28711755/palliative-care-clinicians-caring-for-patients-before-and-after-continuous-flow-left-ventricular-assist-device
#13
Sara E Wordingham, Colleen K McIlvennan, Timothy J Fendler, Amy L Behnken, Shannon M Dunlay, James N Kirkpatrick, Keith M Swetz
Left ventricular assist devices (LVADs) are an available treatment option for carefully-selected patients with advanced heart failure. Initially developed as a bridge to transplantation, LVADs are now also offered to patients ineligible for transplantation as destination therapy (DT). Individuals with a DT-LVAD will live the remainder of their lives with the device in place. While survival and quality of life improve with LVADs compared to medical therapy, complications persist including bleeding, infection, and stroke...
July 12, 2017: Journal of Pain and Symptom Management
https://www.readbyqxmd.com/read/28711647/surgical-training-improves-performance-in-minimally-invasive-left-ventricular-assist-device-implantation-without-cardiopulmonary-bypass
#14
Lu-Feng Zhang, Hai-Bo Feng, Zhi-Guo Yu, Shi Jing, Feng Wan
OBJECTIVE: We introduced a live animal model for training of minimally invasive implantation of a continuous-flow left ventricular assist device (CF-LVAD) without cardiopulmonary bypass for operator's performance improvement. DESIGN: After watching a videotape of LVAD implantation on the beating heart through the cardiac apex, the surgical team performed implantation of LVADs into 5 pigs during 3 training sessions in a time series. The procedure success rate, operating time, and technical and global performances by self-evaluation and senior evaluation were compared among the sessions...
July 12, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28711453/a-roadmap-for-evaluating-the-use-and-value-of-durable-ventricular-assist-device-therapy
#15
EDITORIAL
Sarah T Ward, Qixing Liang, Francis D Pagani, Min Zhang, Robert L Kormos, Keith D Aaronson, Andrew D Althouse, Brahmajee K Nallamothu, Donald S Likosky
Heart failure is a disease characterized by profound human suffering with limitations in survival despite treatment with guideline-directed medical therapies. Patients with heart failure frequently progress to advanced stages and often require cardiac transplantation or implantation of left ventricular assist devices (LVADs) to extend survival and improve quality of life. As the number of suitable heart donors, number of experienced medical centers and patient comorbidities place restrictions on the feasibility of cardiac transplantation, implantation of LVADs has emerged as a more frequently applied treatment as either a bridge to transplantation or as permanent therapy...
June 23, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28709930/particle-image-velocimetry-study-of-the-celiac-trunk-hemodynamic-induced-by-continuous-flow-left-ventricular-assist-device
#16
Francesco Scardulla, Diego Bellavia, Leonardo D'Acquisto, Giuseppe M Raffa, Salvatore Pasta
Whereas left ventricular assist device (LVAD) is the gold-standard therapy for patients with heart failure, gastrointestinal bleeding is one of the most common complications. LVAD implantation may remarkably impact aortic hemodynamics so that experimental and computational flow analyses can be used to study the disease mechanisms. Here we present an experimentally-calibrated computational model of the celiac trunk hemodynamic of a LVAD-supported patient who experienced bleeding after device implantation. Specifically, both particle image velocimetry (PIV) and echocardiography were used to measure and compare flow distributions in each branch of a phantom model of the patient abdominal aorta...
July 12, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28709666/novel-rotational-speed-modulation-system-used-with-venoarterial-extracorporeal-membrane-oxygenation
#17
Noritsugu Naito, Takashi Nishimura, Kei Iizuka, Yutaka Fujii, Yoshiaki Takewa, Akihide Umeki, Masahiko Ando, Minoru Ono, Eisuke Tatsumi
BACKGROUND: Femoral venoarterial extracorporeal membrane oxygenation (VA-ECMO) is widely used to maintain blood flow in patients with cardiogenic shock. However, retrograde blood flow increases left ventricular (LV) afterload during femoral VA-ECMO. Additional support by means of an intraaortic balloon pump (IABP) alleviates LV afterload but is associated with significant adverse events. We previously developed a system for rotational speed modulation in synchrony with the native cardiac cycle, for use with implantable continuous-flow LV assist devices...
July 11, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28708662/imaging-modalities-for-correct-positioning-of-percutaneous-right-ventricular-assist-device-after-left-ventricular-assist-device-implantation
#18
Mariya A Geube, Andrej Alfirevic, Michael Tong
No abstract text is available yet for this article.
July 13, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28708213/novel-use-of-low-dose-thalidomide-in-refractory-gastrointestinal-bleeding-in-left-ventricular-assist-device-patients
#19
Benjamin J J Seng, Louis L Y Teo, Laura L Chan, David K L Sim, Ka L Kerk, Jia L Soon, Teing E Tan, Cumaraswamy Sivathasan, Choon P Lim
BACKGROUND: Gastrointestinal bleeding (GIB) is a complication reported in patients post left ventricular assist device (LVAD) implantation that is associated with high mortality rates. Thalidomide is an anti-angiogenic compound that may offer a potential option for management of refractory LVAD-related GIB. METHODS: A single-center, retrospective review was conducted from January 2009 to October 2016 at a tertiary cardiology center. It included LVAD patients initiated on thalidomide for refractory GIB...
July 11, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28707188/hemodynamic-benefits-of-counterpulsation-implantable-percutaneous-and-intraaortic-rotary-blood-pumps-an-in-silico-and-in-vitro-study
#20
Yu Wang, Steven C Koenig, Michael A Sobieski, Mark S Slaughter, Guruprasad A Giridharan
Mechanical circulatory support (MCS) devices have become a standard therapy for heart failure (HF) patients. MCS device designs may differ by level of support, inflow and/or outflow cannulation sites, and mechanism(s) of cardiac unloading and blood flow delivery. Investigation and direct comparison of hemodynamic parameters that help characterize performance of MCS devices has been limited. We quantified cardiac and vascular hemodynamic responses for different types of MCS devices. Continuous flow (CF) left ventricular (LV) assist devices (LVAD) with LV or left atrial (LA) inlet, counterpulsation devices, percutaneous CF LVAD, and intra-aortic rotary blood pumps (IARBP) were quantified using established computer simulation and mock flow loop models...
July 13, 2017: Cardiovascular Engineering and Technology
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