keyword
MENU ▼
Read by QxMD icon Read
search

organ perfusion

keyword
https://www.readbyqxmd.com/read/29792720/-experimental-processing-of-corrosion-casts-of-large-animal-organs
#1
R Pálek, V Liška, L Eberlová, H Mírka, M Svoboda, S Haviar, M Emingr, O Brzoň, P Mik, V Třeška
INTRODUCTION: Corrosion casts (CCs) are used for the visualization and assessment of hollow structures. CCs with filled capillaries enable (with the help of imaging methods) to obtain data for mathematical organ perfusion modelling. As the processing is more difficult in case of organs with greater volume of the vasculature, mainly organs from small animals have been cast up to now. The aim of this study was to optimize the protocol of corrosion casting of different organs of pig. Porcine organs are relatively easily accessible and frequently used in experimental medicine...
2018: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/29792716/options-to-improve-the-quality-of-kidney-grafts-from-expanded-criteria-donors-experimental-study
#2
J Molacek, V Opatrný, V Treska, R Matejka, O Hes
INTRODUCTION: There is a worldwide discrepancy between the number of donors and the number of organs needed for transplantation, leading to certain expansion of criteria, resulting in acceptance of donor organs. This means that organs with worse parenchymal qualities may be harvested for transplantation. One possibility, how to ameliorate the quality of these organs, is to change the concept of their preservation during cold ischemia or even after sudden circulatory arrest, prior to the collection of the organ itself...
2018: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/29792349/pulmonary-endothelial-permeability-and-tissue-fluid-balance-depend-on-the-viscosity-of-the-perfusion-solution
#3
Simon C Rowan, Keith D Rochfort, Lucie Piouceau, Philip M Cummins, Malachy O'Rourke, Paul McLoughlin
Fluid filtration in the pulmonary microcirculation depends on the hydrostatic and oncotic pressure gradients across the endothelium, and the selective permeability of the endothelial barrier. Maintaining normal fluid balance depends both on specific properties of the endothelium and of the perfusing blood. Although some of the essential properties of blood needed to prevent excessive fluid leak have been identified and characterised, our understanding of these remains incomplete. The role of perfusate viscosity in maintaining normal fluid exchange has not previously been examined...
May 24, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29791060/implementing-an-innovated-preservation-technology-the-american-society-of-transplant-surgeons-asts-standards-committee-white-paper-on-ex-situ-liver-machine-perfusion
#4
Cristino Quintini, Paulo Martins, Shimul Shah, Mary Killackey, Alan Reed, James Guarrera, David A Axelrod
The pervasive shortage of deceased donor liver allografts contributes to significant waitlist mortality despite efforts to increase organ donation. Ex-vivo liver perfusion appears to enhance preservation of donor organs, extending viability, and, potentially, evaluating function in organs previously considered too high risk for transplant. These devices pose novel challenges for organ allocation, safety, training, and finances. This White Paper describes the American Society of Transplant Surgeons' belief that organ preservation technology is a vital advance, but its use should not change fundamental aspects of organ allocation...
May 23, 2018: American Journal of Transplantation
https://www.readbyqxmd.com/read/29790727/pathophysiology-of-severe-traumatic-brain-injury-overview
#5
Ruth A O'leary, Alistair D Nichol
Traumatic brain injury is a leading cause of morbidity and mortality globally, particularly among young people, with significant social and economic effects. The World Health Organization (WHO) estimates that more than five million people die each year from traumatic injuries worldwide. While public health initiative such as seatbelts and airbags have had a major impact, it will be impossible to prevent traumatic brain injury, it is therefore that we understand the pathophysiology of secondary brain injury to be able to effectively treat our patient but aloes to develop novel targets of future interventions...
May 22, 2018: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/29787331/a-customizable-low-cost-perfusion-system-for-sustaining-tissue-constructs
#6
Brian O'Grady, Jason Wang, Shannon Faley, Daniel Balikov, Ethan Lippmann, Leon M Bellan
The fabrication of engineered vascularized tissues and organs requiring sustained, controlled perfusion has been facilitated by the development of several pump systems. Currently, researchers in the field of tissue engineering require the use of pump systems that are in general large, expensive, and generically designed. Overall, these pumps often fail to meet the unique demands of perfusing clinically useful tissue constructs. Here, we describe a pumping platform that overcomes these limitations and enables scalable perfusion of large, three-dimensional hydrogels...
May 1, 2018: SLAS Technology
https://www.readbyqxmd.com/read/29780570/engineering-a-microcirculation-for-perfusion-control-of-ex-vivo-assembled-organ-systems-challenges-and-opportunities
#7
REVIEW
Pavan Kottamasu, Ira Herman
Donor organ shortage remains a clear problem for many end-stage organ patients around the world. The number of available donor organs pales in comparison with the number of patients in need of these organs. The field of tissue engineering proposes a plausible solution. Using stem cells, a patient's autologous cells, or allografted cells to seed-engineered scaffolds, tissue-engineered constructs can effectively supplement the donor pool and bypass other problems that arise when using donor organs, such as who receives the organ first and whether donor organ rejection may occur...
January 2018: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/29777585/potential-vascular-mechanisms-in-an-ex-vivo-functional-pig-bladder-model
#8
Uzoma A Anele, Paul H Ratz, Andrew F Colhoun, Sydney Roberts, Ryan Musselman, Randy A Vince, John E Speich, Adam P Klausner
AIMS: Chronic ischemia is a recognized factor in the pathophysiology of underactive bladder (UAB). Although relative ischemia (ie, low blood flow) is known to occur during filling, little is known regarding the pathophysiology that leads to UAB. Therefore, we developed an ex vivo functional porcine model to investigate the role of transient ischemia and whether autoregulation, a mechanism that maintains tissue oxygenation in certain vital organs, also exists in the bladder. METHODS: Using bladders from slaughtered pigs, we prepared an isolated perfused model where we studied the effects of bladder perfusion flow rate on perfusion pressure and tissue oxygenation during the filling phase...
May 19, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/29776812/preservation-with-%C3%AE-1-antitrypsin-improves-primary-graft-function-of-murine-lung-transplants
#9
Jessica Götzfried, Natalia F Smirnova, Carmela Morrone, Brice Korkmaz, Ali Önder Yildirim, Oliver Eickelberg, Dieter E Jenne
BACKGROUND: Vascular damage and primary graft dysfunction increase with prolonged preservation times of transplanted donor lungs. Hence, storage and conservation of donated lungs in protein-free, dextran-containing electrolyte solutions, like Perfadex, is limited to about 6 hours. We hypothesized that transplanted lungs are protected against neutrophil-mediated proteolytic damage by adding α1 -anti-trypsin (AAT), a highly abundant human plasma proteinase inhibitor, to Perfadex. METHODS: A realistic clinically oriented murine model of lung transplantation was used to simulate the ischemia-reperfusion process...
March 30, 2018: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/29774176/pushing-the-limits-machine-preservation-of-the-liver-as-a-tool-to-recondition-high-risk-grafts
#10
REVIEW
Yuri L Boteon, Simon C Afford, Hynek Mergental
Purpose of the Review: Machine perfusion (MP) is a novel technology recently introduced in liver transplantation, redefining the current practice of organ preservation and pushing the limits of high-risk liver utilisation. This review highlights the key benefits of machine perfusion over conventional static cold storage (SCS), demonstrated in human liver research and clinical transplants. Recent Findings: The first clinical trials have demonstrated both safety and feasibility of MP...
2018: Current Transplantation Reports
https://www.readbyqxmd.com/read/29773856/hyperbaric-oxygen-can-induce-angiogenesis-and-recover-erectile-function
#11
Amir Hadanny, Erez Lang, Laurian Copel, Oshra Meir, Yair Bechor, Gregory Fishlev, Jacob Bergan, Amnon Zisman, Shai Efrati
Erectile dysfunction (ED) is caused by microvascular or macrovascular insufficiency in the majority of patients. Recent studies have shown that hyperbaric oxygen therapy (HBOT) can induce angiogenesis in different body organs. The effect of HBOT on the non-surgery-related ED has not been investigated yet. The aim of the current study was to evaluate the effects of HBOT on sexual function and penile vascular bed in non-surgical ED patients. A prospective analysis of patients suffering from chronic ED treated with 40 daily HBOT sessions...
May 18, 2018: International Journal of Impotence Research
https://www.readbyqxmd.com/read/29770885/does-near-infrared-nir-fluorescence-angiography-modify-operative-strategy-during-emergency-procedures
#12
Emilie Liot, Michela Assalino, Nicolas Christian Buchs, Boris Schiltz, Jonathan Douissard, Philippe Morel, Frédéric Ris
INTRODUCTION: Bowel viability can be difficult to evaluate during emergency surgery. Near-infrared (NIR) fluorescence angiography allows an intraoperative assessment of organ perfusion during elective surgery and might help to evaluate intestinal perfusion during emergency procedures. The aim of this study was to assess if NIR modified operative strategy during emergency surgery. MATERIALS AND METHODS: From July 2014 to December 2015, we prospectively evaluated all consecutive patients, who had NIR assessment during emergency surgery...
May 16, 2018: Surgical Endoscopy
https://www.readbyqxmd.com/read/29763886/perfusion-computer-tomography-assessment-of-the-effect-of-angiotensin-ii-on-blood-flow-distribution-in-rabbits-with-intrarenal-vx2-tumors
#13
Ying-Jin Xu, Song-Hong Wu, Huai-Jun Liu, Pei Niu, Wen-Zeng Shen, Ying-Jie Xu, Xiao-Ping Yin, Tian-Le Zhang, Xue-Zhao Li, Fei Guo, Xiao-Long Niu, Jin-Song Zhu
BACKGROUND/AIMS: Unlike other organs, which only have one set of capillary network, the renal microvasculature consists of two sets of capillary network series connected by efferent arterioles. Angiotensin II constricts the efferent glomerular artery. Hence, renal tumor blood flow (BF) distribution may be different from tumors in other organs. This study aims to investigate the effects of angiotensin II on the hemodynamics of intrarenal VX2 tumors using perfusion computed tomography(CT)...
May 9, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29758129/twenty-four-hour-normothermic-perfusion-of-discarded-human-kidneys-with-urine-recirculation
#14
Annemarie Weissenbacher, Letizia Lo Faro, Olga Boubriak, Maria F Soares, Ian S Roberts, James P Hunter, Daniel Voyce, Nikolay Mikov, Andrew Cook, Rutger J Ploeg, Constantin C Coussios, Peter J Friend
Transportable normothermic kidney perfusion for 24 hours or longer could enable viability assessment of marginal grafts, increased organ utilization and improved transplantation logistics. Eleven clinically-declined kidneys were perfused normothermically, six from donors after brain stem death (DBD, median cold ischemia time 33±36.9 hours) and five from donors after circulatory death (DCD, 36.2±38.3 hours): n=3 kidneys were perfused using Ringer's lactate to replace excreted urine volume, and n=8 using urine recirculation to maintain perfusate volume without fluid replenishment...
May 14, 2018: American Journal of Transplantation
https://www.readbyqxmd.com/read/29754046/brain-stiffens-post-mortem
#15
J Weickenmeier, M Kurt, E Ozkaya, R de Rooij, T C Ovaert, R L Ehman, K Butts Pauly, E Kuhl
Alterations in brain rheology are increasingly recognized as a diagnostic marker for various neurological conditions. Magnetic resonance elastography now allows us to assess brain rheology repeatably, reproducibly, and non-invasively in vivo. Recent elastography studies suggest that brain stiffness decreases one percent per year during normal aging, and is significantly reduced in Alzheimer's disease and multiple sclerosis. While existing studies successfully compare brain stiffnesses across different populations, they fail to provide insight into changes within the same brain...
April 22, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29753977/how-scalable-and-suitable-are-single-use-bioreactors
#16
REVIEW
Stefan Junne, Peter Neubauer
Although the scalability of stainless steel bioreactors has been investigated for more than 50 years, and many methods for the characterization of these bioreactors have been evolved, the investigation of scalability of single-use bioreactors (SUBs) contains several new challenges. SUBs permit a versatile design that is not necessarily oriented towards classical geometric conditions and allows a wide variety of mixing principles. Among the various principles might be some advantageous for the cultivation of particular types of shear-sensitive cells, such as mycelium-forming organisms and stem cells...
May 10, 2018: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/29753517/liberal-versus-restrictive-intravenous-fluid-therapy-for-early-septic-shock-rationale-for-a-randomized-trial
#17
Wesley H Self, Matthew W Semler, Rinaldo Bellomo, Samuel M Brown, Bennett P deBoisblanc, Matthew C Exline, Adit A Ginde, Colin K Grissom, David R Janz, Alan E Jones, Kathleen D Liu, Stephen P J Macdonald, Chadwick D Miller, Pauline K Park, Lora A Reineck, Todd W Rice, Jay S Steingrub, Daniel Talmor, Donald M Yealy, Ivor S Douglas, Nathan I Shapiro
Prompt intravenous fluid therapy is a fundamental treatment for patients with septic shock. However, the optimal approach for administering intravenous fluid in septic shock resuscitation is unknown. Two competing strategies are emerging: a liberal fluids approach, consisting of a larger volume of initial fluid (50 to 75 mL/kg [4 to 6 L in an 80-kg adult] during the first 6 hours) and later use of vasopressors, versus a restrictive fluids approach, consisting of a smaller volume of initial fluid (≤30 mL/kg [≤2 to 3 L]), with earlier reliance on vasopressor infusions to maintain blood pressure and perfusion...
May 9, 2018: Annals of Emergency Medicine
https://www.readbyqxmd.com/read/29752920/direct-heart-procurement-following-donation-after-circulatory-death-with-ex-situ-reperfusion
#18
Hassiba Smail, Diana Garcia Saez, Ulrich Stock, Hesham Ahmed Hassan, Christopher Bowles, Barlomiej Zych, Prashant N Mohite, Olaf Maunz, Andre R Simon
The most extended technique of Heart procurement from donors after circulatory death (DCD)involves direct procurement and reperfusion in ex situ normothermic platform using Organ Care System (OCS). We describe a modified technique at our institution with rapid donor blood drainage using a cell saver and synchronised perfusion on the OCS.
May 9, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29748585/humanizing-miniature-hearts-through-4-flow-cannulation-perfusion-decellularization-and-recellularization
#19
Duong T Nguyen, Matthew O'Hara, Cecilia Graneli, Ryan Hicks, Tasso Miliotis, Ann-Christin Nyström, Sara Hansson, Pia Davidsson, Li-Ming Gan, Maria Chiara Magnone, Magnus Althage, Sepideh Heydarkhan-Hagvall
Despite improvements in pre-clinical drug testing models, predictability of clinical outcomes continues to be inadequate and costly due to poor evidence of drug metabolism. Humanized miniature organs integrating decellularized rodent organs with tissue specific cells are translational models that can provide further physiological understanding and evidence. Here, we evaluated 4-Flow cannulated rat hearts as the fundamental humanized organ model for cardiovascular drug validation. Results show clearance of cellular components in all chambers in 4-Flow hearts with efficient perfusion into both coronary arteries and cardiac veins...
May 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29746324/extracorporeal-perfusion-in-vascularized-composite-allotransplantation-current-concepts-and-future-prospects
#20
Maximilian Kueckelhaus, Flemming Puscz, Alexander Dermietzel, Mehran Dadras, Sebastian Fischer, Nicco Krezdorn, Bohdan Pomahac, Tobias Hirsch
Severe injuries of the face and limbs remain a major challenge in today's reconstructive surgery. Vascularized composite allotransplantation (VCA) has emerged as a promising approach to restore these defects. Yet, there are major obstacles preventing VCA from broad clinical application. Two key restrictions are (1) the graft's limited possible ischemia time, keeping the potential donor radius extremely small, and (2) the graft's immunogenicity, making extensive lifelong monitoring and immunosuppressive treatment mandatory...
June 2018: Annals of Plastic Surgery
keyword
keyword
57508
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"