keyword
MENU ▼
Read by QxMD icon Read
search

Ventricle assist device

keyword
https://www.readbyqxmd.com/read/29148023/fluid-structure-interaction-model-analysis-of-cerebrospinal-fluid-circulation-in-patients-with-continuous-flow-left-ventricular-assist-devices
#1
Jessica G Y Luc, Clifford A Pierre, Kevin Phan, Yashar S Vahedein, Alexander S Liberson, William K Cornwell, Steven J Phillips, Vakhtang Tchantchaleishvili
PURPOSE: The current 1-dimensional fluid structure interaction model (FSI) for understanding cerebrospinal fluid (CSF) circulation requires pulsatility as a precondition and has not been applied to patients with continuous-flow left ventricular assist devices (CF-LVAD) where pulsatility is chronically reduced. Our study aims to characterize the behavior of CSF pressure and flow in patients with CF-LVADs using a computational FSI model. METHODS: Utilizing the computational FSI model, CSF production in choroid plexuses of the 4 ventricles was specified as a boundary condition for the model...
November 16, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/29129374/the-jarvik-2000-left-ventricular-assist-device-as-a-bridge-to-transplantation-japanese-registry-for-mechanically-assisted-circulatory-support
#2
Hiroki Kohno, Goro Matsumiya, Yoshiki Sawa, Minoru Ono, Yoshikatsu Saiki, Akira Shiose, Kenji Yamazaki, Yoshiro Matsui, Hiroshi Niinami, Hikaru Matsuda, Soichiro Kitamura, Takeshi Nakatani, Shunei Kyo
BACKGROUND: The Jarvik 2000 ventricular assist device features a miniaturized intraventricular pump and an intermittent low-speed function that facilitates aortic valve opening. Despite its long history, little is known about the Jarvik device with regard to post-implantation outcomes. METHODS: Prospectively collected data from 13 participating hospitals were extracted from the Japanese Registry for Mechanically Assisted Circulatory Support database to analyze mortality, morbidity and de-novo aortic regurgitation...
October 24, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/29118889/successful-treatment-of-iatrogenic-external-iliac-artery-perforation-with-covered-stent-case-report-and-review-of-the-literature
#3
Muhammad Umer Awan, Bassam Omar, Ghazanfar Qureshi, Ghulam Mustafa Awan
Retroperitoneal hemorrhage from iliac artery injury is a potentially serious complication of vascular interventional procedures leading to hemorrhagic shock and death if not diagnosed early and treated promptly. We report a 70-year-old male admitted to our facility with non-ST-elevation myocardial infarction, whose heart catheterization revealed left anterior descending artery (LAD) with 80% proximal, 95% mid and 100% distal disease. The left circumflex and right coronary arteries were 100% occluded proximally and received collaterals from the LAD...
October 2017: Cardiology Research
https://www.readbyqxmd.com/read/29103857/phenotype-management-and-predictors-of-outcome-in-a-large-cohort-of-adult-congenital-heart-disease-patients-with-heart-failure
#4
Alexander Van De Bruaene, Edward J Hickey, Adrienne H Kovacs, Andrew M Crean, Rachel M Wald, Candice K Silversides, Andrew N Redington, Heather J Ross, Ana Carolina Alba, Filio Billia, Krishnakumar Nair, Lee Benson, Eric Horlick, Mark Osten, Jack Colman, Jane Heggie, Erwin N Oechslin, S Lucy Roche
OBJECTIVE: Although heart failure (HF) is the leading cause of premature death in adult congenital heart disease (ACHD), little population-specific data exist. This study reports early experience from a dedicated, sub-specialty adult congenital heart disease-heart failure (ACHD-HF) clinic, aiming to identify risk factors for adverse outcome. METHODS: Between 2012 and 2015, 126 patients (57% male) attended the ACHD-HF clinic. Baseline and follow-up data were analysed and compared across 4 anatomical/physiological subgroups: cyanotic ACHD, Fontan circulation (1V), biventricular circulation with a subaortic right ventricle (2V-RV) and biventricular circulation with a subaortic left ventricle (2V-LV)...
October 31, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29098548/influence-of-lvad-function-on-mechanical-unloading-and-electromechanical-delay-a-simulation-study
#5
Aulia Khamas Heikhmakhtiar, Ah Jin Ryu, Eun Bo Shim, Kwang-Soup Song, Natalia A Trayanova, Ki Moo Lim
This study hypothesized that a left ventricular assist device (LVAD) shortens the electromechanical delay (EMD) by mechanical unloading. The goal of this study is to examine, by computational modeling, the influence of LVAD on EMD for four heart failure (HF) cases ranging from mild HF to severe HF. We constructed an integrated model of an LVAD-implanted cardiovascular system, then we altered the Ca(2+) transient magnitude, with scaling factors 1, 0.9, 0.8, and 0.7 representing HF1, HF2, HF3, and HF4, respectively, in order of increasing HF severity...
November 3, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29095737/long-term-right-ventricular-assist-device-therapy-in-an-adult-with-pulmonary-atresia-intact-ventricular-septum
#6
Joshua L Hermsen, Karen K Stout, April Stempien-Otero, Edward D Verrier, Nahush A Mokadam
Durable ventricular assist device (VAD) support is uncommonly employed in adult congenital heart disease and often involves supporting a systemic right ventricle (RV). Ventricular assist device support of a subpulmonic RV is even more unusual.
October 31, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29080191/computational-analysis-of-the-effect-of-mitral-and-aortic-regurgitation-on-the-function-of-ventricular-assist-devices-using-3d-cardiac-electromechanical-model
#7
Yoo Seok Kim, Ana R Yuniarti, Kwang-Soup Song, Natalia A Trayanova, Eun Bo Shim, Ki Moo Lim
Valvular insufficiency affects cardiac responses and the pumping efficacy of left ventricular assist devices (LVADs) when patients undergo LVAD therapy. Knowledge of the effect of valvular regurgitation on the function of LVADs is important when treating heart failure patients. The goal of this study was to examine the effect of valvular regurgitation on the ventricular mechanics of a heart under LVAD treatment and the pumping efficacy of an LVAD using a computational model of the cardiovascular system. For this purpose, a 3D electromechanical model of failing ventricles in a human heart was coupled with a lumped-parameter model of valvular regurgitation and an LVAD-implanted vascular system...
October 28, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29072502/improving-hemodynamics-of-cardiovascular-system-under-a-novel-intraventricular-assist-device-support-via-modeling-and-simulations
#8
Shidong Zhu, Lin Luo, Bibo Yang, Xinghui Li, Xiaohao Wang
Ventricular assist devices (LVADs) are increasingly recognized for supporting blood circulation in heart failure patients who are non-transplant eligible. Because of its volume, the traditional pulsatile device is not easy to implant intracorporeally. Continuous flow LVADs (CF-LVADs) reduce arterial pulsatility and only offer continuous flow, which is different from physiological flow, and may cause long-term complications in the cardiovascular system. The aim of this study was to design a new pulsatile assist device that overcomes this disadvantage, and to test this device in the cardiovascular system...
October 26, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/29061186/successful-bridge-to-recovery-in-fulminant-myocarditis-using-a-biventricular-assist-device-a-case-report
#9
Yusuke Adachi, Osamu Kinoshita, Masaru Hatano, Yukako Shintani, Noritsugu Naito, Mitsutoshi Kimura, Kan Nawata, Daisuke Nitta, Hisataka Maki, Kazutaka Ueda, Eisuke Amiya, Eiki Takimoto, Issei Komuro, Minoru Ono
BACKGROUND: Fulminant myocarditis is a life-threatening disease, and myocardial damage expands the right ventricle as well as the left ventricle in some cases. There is a mortality rate of over 40% in patients with fulminant myocarditis who need mechanical circulatory support by peripheral venoarterial extracorporeal membrane oxygenation. CASE PRESENTATION: We report a case of a 27-year-old Japanese woman who was successfully bridged to recovery by using a biventricular assist device...
October 24, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29060110/replication-of-pressure-volume-loop-with-controllable-espvr-and-edpvr-curves-on-a-personalized-mock-circulatory-loop-based-on-elastance-function
#10
Yaxin Wang, P Alex Smith, Paul De-Sciscio, Luiz C Sampaio, William E Cohn, Liping Xu, Richard A McMahon
In the development of a left ventricular assist device (LVAD), it is important to evaluate the LVAD's hemodynamic effect on the compromised left ventricle (LV) before surgical implantation. The mock circulatory loop (MCL) is widely accepted as an in vitro test platform to evaluate LVADs across a wide range of operational conditions as a way to examine how the device and the cardiovascular system interact. Unfortunately, most MCLs represent an oversimplified model of cardiac function, with disease states simulated through generalized changes in heart rate and stroke volume...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29053103/ultrasound-functional-imaging-in-an-i-ex-vivo-i-beating-porcine-heart-platform
#11
Niels J Petterson, Louis S Fixsen, Marcel C M Rutten, Nico H J Pijls, Frans N van de Vosse, Richard G P Lopata
In recent years, novel ultrasound functional imaging (UFI) techniques have been introduced to assess cardiac function by measuring, e.g., cardiac output (CO) and/or myocardial strain. Verification and reproducibility assessment in a realistic setting remain major issues. Simulations and phantoms are often unrealistic, whereas in vivo measurements often lack crucial hemodynamic parameters or ground truth data, or suffer from the large physiological and clinical variation between patients when attempting clinical validation...
October 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29049683/ventricular-assist-device-in-a-failing-total-cavopulmonary-connection-a-new-step-by-step-approach
#12
Carlo Pace Napoleone, Maria Teresa Cascarano, Luca Deorsola, Andrea Valori
The management of failing Fontan patients with mechanical circulatory support has been reported with unsatisfactory results. A 5-year-old girl, listed for heart transplantation for failing Fontan, underwent rescue extracorporeal membrane oxygenation support. As it was necessary to move the patient to the Berlin Heart Excor, a step-by-step approach was designed to obtain a gradual adaptation to this form of support. A central extracorporeal membrane oxygenation, with a Berlin Heart apical and aortic cannulae, was implanted leaving the previously positioned femoral vein cannula in parallel with the outflow apical one...
September 11, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29049673/incidence-and-echocardiographic-predictors-of-early-postoperative-right-ventricular-dysfunction-following-left-ventricular-assist-implantation-in-paediatric-patients
#13
Mathias Redlin, Oliver Miera, Helmut Habazettl, Joachim Photiadis, María Irene Carísimo-Cresta, Mathias Hommel, Benjamin O'Brien, Marian Kukucka
OBJECTIVES: Left ventricular assist device implantation is an established therapy for paediatric patients with end-stage heart failure. Early right ventricular dysfunction (RVD) after implantation still remains a challenge in the postoperative period. This study sought to determine the incidence of RVD and to identify echocardiographic predictors of RVD in paediatric patients, as well describing associated clinical outcome. METHODS: Prospectively collected preoperative echocardiographic, haemodynamic, demographic and biochemical data from 48 patients scheduled for left ventricular assist device implantation were evaluated...
July 31, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29032583/third-generation-ventricular-assist-device-mid-term-outcomes-of-the-heartware-hvad-in-pediatric-patients
#14
Mustafa Pac, Sinan Sabit Kocabeyoglu, Umit Kervan, Dogan Emre Sert, Serhat Koca, Ibrahim Ece, Feyza Aysenur Pac
The HeartWare HVAD is a small, third generation continuous flow pump that is intracorporeally placed for support of a failing ventricle in adult patients. This device is small in size when compared to other left ventricular assist devices and can therefore be used in smaller sized pediatric patients. We present our initial experience using the HVAD as a bridge to heart transplantation in the pediatric population. We performed a retrospective, single center, nonrandomized review of 17 pediatric patients who underwent HVAD implantation between June 2013 and March 2016...
October 15, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29017566/right-ventricular-functional-analysis-utilizing-first-pass-radionuclide-angiography-for-pre-operative-ventricular-assist-device-planning-a-multi-modality-comparison
#15
Ryan Avery, Kevin Day, Clinton Jokerst, Toshinobu Kazui, Elizabeth Krupinski, Zain Khalpey
BACKGROUND: Advanced heart failure treated with a left ventricular assist device is associated with a higher risk of right heart failure. Many advanced heart failures patients are treated with an ICD, a relative contraindication to MRI, prior to assist device placement. Given this limitation, left and right ventricular function for patients with an ICD is calculated using radionuclide angiography utilizing planar multigated acquisition (MUGA) and first pass radionuclide angiography (FPRNA), respectively...
October 10, 2017: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28988400/left-ventricle-assist-devices-and-driveline-s-infection-incidence-a-single-centre-experience
#16
Jonida Bejko, Francesca Toto, Dario Gregori, Gino Gerosa, Tomaso Bottio
Different left ventricular assist devices (LVADs) are provided of different driveline exit sites: HeartWare HVAD presents abdominal power-cable-supply, while the Jarvik 2000 LVAD is powered by a retroauricular driveline. We analyzed 93 LVAD-implanted patients from January-2009 to October-2016 (41 HeartWare and 52 Jarvik 2000), hypothesizing a different incidence of infection, according to driveline exit site. The two populations were propensity matched for the demographic data and preoperative variables, and the outcomes were further analyzed...
October 7, 2017: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/28975053/extracorporeal-life-support-with-left-ventricular-decompression-improved-survival-in-severe-cardiogenic-shock-results-from-a-retrospective-study
#17
Bastian Schmack, Philipp Seppelt, Alexander Weymann, Christina Alt, Mina Farag, Rawa Arif, Andreas O Doesch, Philip W Raake, Klaus Kallenbach, Ashham Mansur, Aron-Frederik Popov, Matthias Karck, Arjang Ruhparwar
OBJECTIVE: Extracorporeal life support (ECLS) is a life-saving procedure used in the treatment of severe cardiogenic shock. Within this retrospective single centre study, we examined our experience in this critically ill patient cohort to assess outcomes and clinical parameters by comparison of ECLS with or without selective left ventricular decompression. METHODS: Between 2004 and 2014 we evaluated 48 adult patients with INTERMACS level 1 heart failure (age 49...
2017: PeerJ
https://www.readbyqxmd.com/read/28965736/second-annual-pediatric-interagency-registry-for-mechanical-circulatory-support-pedimacs-report-pre-implant-characteristics-and-outcomes
#18
Elizabeth D Blume, Christina VanderPluym, Angela Lorts, J Timothy Baldwin, Joseph W Rossano, David L S Morales, Ryan S Cantor, Marissa A Miller, James D St Louis, Devin Koehl, David L Sutcliffe, Pirooz Eghtesady, James K Kirklin, David N Rosenthal
BACKGROUND: Expanded use of pediatric ventricular assist devices (VADs) has decreased mortality in children awaiting heart transplantation. Pediatric Interagency Registry for Mechanical Circulatory Support (Pedimacs), a National Heart, Lung, and Blood Institute-sponsored North American database, provides a platform to understand this emerging population. METHODS: Between September 2012 and September 2016, patients aged younger than 19 years who underwent VAD implantation were enrolled in Pedimacs...
July 4, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28959097/the-role-of-endoglin-in-myocardial-fibrosis
#19
REVIEW
Kou-Gi Shyu
Myocardial fibrosis is closely associated with heart failure because myocardial fibrosis may cause the loss of normal cardiac function. Endoglin is a homeodimeric membrane glycoprotein, a co-receptor of transforming growth factor-β1 (TGF-β1) and β3. Endoglin is a potent mediator of profibrotic effects of angiotensin II on cardiac fibroblasts and can modulate the effect of TGF-β1 on extracellular matrix synthesis. These data indicate that endoglin plays an important role in fibrogenesis in cardiac remodeling...
September 2017: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/28950368/safety-and-feasibility-of-contrast-echocardiography-for-the-evaluation-of-patients-with-heartmate-3-left-ventricular-assist-devices
#20
Arend F L Schinkel, Sakir Akin, Mihai Strachinaru, Rahatullah Muslem, Osama I I Soliman, Jasper J Brugts, Alina A Constantinescu, Olivier C Manintveld, Kadir Caliskan
Aims: Patients with a left ventricular assist device (LVAD) are challenging to evaluate using conventional imaging techniques, such as standard echocardiography (SE). The aim of this pilot study was to evaluate the potential of contrast echocardiography (CE) for the evaluation of the left ventricle (LV). Methods and results: This prospective study included 14 ambulatory patients (mean age 58 ± 9 years, 79% male) with a LVAD (all HeartMate 3, Abbott Laboratories, Chicago, IL, USA)...
July 26, 2017: European Heart Journal Cardiovascular Imaging
keyword
keyword
35085
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"