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Circulatory physiology

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https://www.readbyqxmd.com/read/29035429/where-is-the-optimal-fontan-hemodynamics
#1
REVIEW
Hideo Ohuchi
Fontan circulation is generally characterized by high central venous pressure, low cardiac output, and slightly low arterial oxygen saturation, and it is quite different from normal biventricular physiology. Therefore, when a patient with congenital heart disease is selected as a candidate for this type of circulation, the ultimate goals of therapy consist of 2 components. One is a smooth adjustment to the new circulation, and the other is long-term circulatory stabilization after adjustment. When either of these goals is not achieved, the patient is categorized as having "failed" Fontan circulation, and the prognosis is dismal...
September 18, 2017: Korean Circulation Journal
https://www.readbyqxmd.com/read/29026925/er-protein-quality-control-and-the-unfolded-protein-response-in-the-heart
#2
A Arrieta, E A Blackwood, C C Glembotski
Cardiac myocytes are the cells responsible for the robust ability of the heart to pump blood throughout the circulatory system. Cardiac myocytes grow in response to a variety of physiological and pathological conditions; this growth challenges endoplasmic reticulum-protein quality control (ER-PQC), a major feature of which includes the unfolded protein response (UPR). ER-PQC and the UPR in cardiac myocytes growing under physiological conditions, including normal development, exercise, and pregnancy, are sufficient to support hypertrophic growth of each cardiac myocyte...
October 13, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/29023795/real-time-ecg-simulation-for-hybrid-mock-circulatory-loops
#3
Leonie Korn, Daniel Rüschen, Niklas Zander, Steffen Leonhardt, Marian Walter
Classically, mock circulatory loops only simulate mechanical properties of the circulation. To connect the hydraulic world with electrophysiology, we present a real-time electrical activity model of the heart and show how to integrate this model into a real-time mock loop simulation. The model incorporates a predefined conduction pathway and a simplified volume conductor to solve the bidomain equations and the forward problem of electrocardiography, resulting in a physiological simulation of the electrocardiogram (ECG) at arbitrary electrode positions...
October 12, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29019760/mr-lymphangiography-in-children-technique-and-potential-applications
#4
Govind B Chavhan, Joao G Amaral, Michael Temple, Maxim Itkin
The lymphatic system, an important component of the circulatory system with essential physiologic functions, can be affected by various disease processes. There has been a delay in the development of effective imaging methods for the lymphatic system due to its small size, which limits visualization as well as introduction of contrast material. Traditionally, the lymphatic system has been imaged by injecting contrast material or radiotracers into the feet or hands. This is not sufficient for assessment of the central conducting lymphatics (CCLs) (such as the thoracic duct or the cisterna chyli)...
October 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28993738/continuous-release-of-tumor-derived-factors-improves-the-modeling-of-cachexia-in-muscle-cell-culture
#5
Robert W Jackman, Jess Floro, Rei Yoshimine, Brian Zitin, Maythita Eiampikul, Kahlid El-Jack, Danielle N Seto, Susan C Kandarian
Cachexia is strongly associated with a poor prognosis in cancer patients but the biological trigger is unknown and therefore no therapeutics exist. The loss of skeletal muscle is the most deleterious aspect of cachexia and it appears to depend on secretions from tumor cells. Models for studying wasting in cell culture consist of experiments where skeletal muscle cells are incubated with medium conditioned by tumor cells. This has led to candidates for cachectic factors but some of the features of cachexia in vivo are not yet well-modeled in cell culture experiments...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28992628/ultrastructural-confocal-and-viscoelastic-characteristics-of-whole-blood-and-plasma-after-exposure-to-cadmium-and-chromium-alone-and-in-combination-an-ex-vivo-study
#6
Chantelle Venter, Hester Magdalena Oberholzer, Janette Bester, Mia-Jeanne van Rooy, Megan Jean Bester
BACKGROUND/AIMS: Heavy metal pollution is increasing in the environment, contaminating water, food and air supplies. This can be linked to many anthropogenic activities. Heavy metals are absorbed through the skin, inhalation and/or orally. Irrespective of the manner of heavy metal entry in the body, the blood circulatory system is potentially the first to be affected following exposure and adverse effects on blood coagulation can lead to associated thrombotic disease. Although the plasma levels and the effects of cadmium (Cd) and chromium (Cr) on erythrocytes and lymphocytes have been described, the environmental exposure to heavy metals are not limited to a single metal and often involves metal mixtures, with each metal having different rates of absorption, different cellular, tissue, and organ targets...
October 9, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28992195/neural-versus-gonadal-gnih-are-they-independent-systems-a-mini-review
#7
George E Bentley, Kathryn Wilsterman, Darcy K Ernst, Sharon E Lynn, Molly J Dickens, Rebecca M Calisi, Lance J Kriegsfeld, Daniela Kaufer, Anna C Geraghty, Dax viviD, Nicolette L McGuire, Patricia C Lopes, Kazuyoshi Tsutsui
Based on research in protochordates and basal vertebrates, we know that communication across the first endocrine axes likely relied on diffusion. Because diffusion is relatively slow, rapid responses to some cues, including stress-related cues, may have required further local control of axis outputs (e.g., steroid hormone production by the gonads). Despite the evolution of much more efficient circulatory systems and complex nervous systems in vertebrates, production of many "neuro"transmitters has been identified outside of the hypothalamus across the vertebrate phylogeny and these neurotransmitters are known to locally regulate endocrine function...
September 2, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28991880/folic-acid-impairs-the-uptake-of-5-methyltetrahydrofolate-in-human-umbilical-vascular-endothelial-cells
#8
Desiree Smith, Jacqueline Hornstra, Monica Rocha, Gerrit Jansen, Yehuda Assaraf, Inbal Lasry, Henk Blom, Yvo M Smulders
BACKGROUND: Adequate folate status supports endothelial structure and function. Folic acid (FA), an oxidized synthetic folate, which is present in the plasma of patients consuming fortified food or FA supplements, may impair cellular uptake of physiological, reduced folates. We studied the effect of FA on uptake of the dominant circulatory folate, 5-methyltetrahydrofolate (5MTHF) in endothelial cells. METHODS AND RESULTS: For short-term effects of FA, primary human umbilical vein endothelial cells (HUVECs) were maintained in growth medium containing 200 nM 5MTHF and preincubated with 20 nM FA 10 minutes before the 5MTHF uptake assessment...
October 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28984705/the-crashing-patient-hemodynamic-collapse
#9
Hitesh Gidwani, Hernando Gómez
PURPOSE OF REVIEW: Rapid restoration of tissue perfusion and oxygenation are the main goals in the resuscitation of a patient with circulatory collapse. This review will focus on providing an evidence based framework of the technological and conceptual advances in the evaluation and management of the patient with cardiovascular collapse. RECENT FINDINGS: The initial approach to the patient in cardiovascular collapse continues to be based on the Ventilate-Infuse-Pump rule...
October 4, 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28977367/novel-mouse-model-of-cardiopulmonary-bypass
#10
Nodir Madrahimov, Erin C Boyle, Faikah Gueler, Tobias Goecke, Ann-Kathrin Knöfel, Valentyna Irkha, Lavinia Maegel, Klaus Höffler, Ruslan Natanov, Issam Ismail, Ulrich Maus, Christian Kühn, Gregor Warnecke, Malakh-Lal Shrestha, Serghei Cebotari, Axel Haverich
OBJECTIVES: Cardiopulmonary bypass (CPB) is an essential component of many cardiac interventions, and therefore, there is an increasing critical demand to minimize organ damage resulting from prolonged extracorporeal circulation. Our goal was to develop the first clinically relevant mouse model of CPB and to examine the course of extracorporeal circulation by closely monitoring haemodynamic and oxygenation parameters. METHODS: Here, we report the optimization of device design, perfusion circuit and microsurgical techniques as well as validation of physiological functions during CPB in mice after circulatory arrest and reperfusion...
July 18, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28965736/second-annual-pediatric-interagency-registry-for-mechanical-circulatory-support-pedimacs-report-pre-implant-characteristics-and-outcomes
#11
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/28953635/sequential-organ-failure-assessment-predicts-outcomes-of-pulse-indicator-contour-continuous-cardiac-output-directed-goal-therapy-a-prospective-study
#12
Wei Zhang, Quzhen Danzeng, Xiaoting Feng, Xing Cao, Weiwei Chen, Yan Kang
According to the new sepsis definitions, septic shock is defined as a subset of sepsis in which the underlying circulatory and cellular/metabolic abnormalities are profound enough to substantially increase mortality. We evaluated the predictive efficacy of the Sequential Organ Failure Assessment (SOFA) score in critically ill patients with septic shock undergoing pulse indicator contour continuous cardiac output (PiCCO)-directed goal therapy (PDGT).We conducted a single-center, prospective, observational study of 52 patients with septic shock undergoing PDGT...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28953199/the-utility-of-a-wireless-implantable-hemodynamic-monitoring-system-in-patients-requiring-mechanical-circulatory-support
#13
David S Feldman, Nader Moazami, Philip B Adamson, Juliane Vierecke, Nir Raval, Satya Shreenivas, Barry M Cabuay, Javier Jimenez, William T Abraham, John B O'Connell, Yoshifumi Naka
Proper timing of left ventricular assist device (LVAD) implantation in advanced heart failure patients is not well established and is an area of intense interest. In addition, optimizing LVAD performance after implantation remains difficult and represents a significant clinical need. Implantable hemodynamic monitoring systems may provide physicians with the physiologic information necessary to improve the timing of LVAD implantation as well as LVAD performance when compared with current methods. The CardioMEMS Heart sensor Allows for Monitoirng of Pressures to Improve Outcomes in NYHA Class III heart failure patients (CHAMPION) Trial enrolled 550 previously hospitalized patients with New York Heart Association (NYHA) class III heart failure...
September 25, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28949265/reference-values-for-blood-pressure-response-to-cycle-ergometry-in-the-first-two-decades-of-life-comparison-with-patients-with-a-repaired-coarctation-of-the-aorta
#14
Mirna Kaafarani, Christian Schroer, Tim Takken
BACKGROUND: It is now common practice to use hemodynamic responses to exercise as markers of diagnosis for cardiac diseases in children, systolic blood pressure especially. However, the reference values for SBP in children at peak exertion level are outdated, and, without a current definition of normal, clinicians cannot determine the physiologically impaired. OBJECTIVE: This study aimed to establish current reference values for peak systolic blood pressure (SBP), rate pressure product (RPP), and circulatory power (CircP)...
September 26, 2017: Expert Review of Cardiovascular Therapy
https://www.readbyqxmd.com/read/28948619/analysis-of-pediatric-adverse-reactions-to-transfusions
#15
Sarah Vossoughi, Gabriela Perez, Barbee I Whitaker, Mark K Fung, Brie Stotler
BACKGROUND: Children are known to be physiologically and biochemically different from adults. However, there are no multi-institutional studies examining the differences in the frequency, type, and severity of transfusion reactions in pediatric versus adult patients. This study aims to characterize differences between pediatric and adult patients regarding adverse responses to transfusions. STUDY DESIGN AND METHODS: This is a retrospective data analysis of nine children's hospitals and 35 adult hospitals from January 2009 through December 2015...
September 25, 2017: Transfusion
https://www.readbyqxmd.com/read/28929388/fiber-reinforced-computational-model-of-the-aortic-root-incorporating-thoracic-aorta-and-coronary-structures
#16
Hossein Mohammadi, Raymond Cartier, Rosaire Mongrain
Cardiovascular diseases are still the leading causes of death in the developed world. The decline in the mortality associated with circulatory system diseases is accredited to development of new diagnostic and prognostic tools. It is well known that there is an inter relationship between the aortic valve impairment and pathologies of the aorta and coronary vessels. However, due to the limitations of the current tools, the possible link is not fully elucidated. Following our previous model of the aortic root including the coronaries, in this study, we have further developed the global aspect of the model by incorporating the anatomical structure of the thoracic aorta...
September 19, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28917821/circulatory-cell-mediated-nanotherapeutic-approaches-in-disease-targeting
#17
Thierry Burnouf, Pierre-Alain Burnouf, Yu-Wen Wu, Er-Yuan Chuang, Long-Sheng Lu, Hadi Goubran
Circulating blood cells, and cell-derived microvesicles, are emerging as pragmatic delivery systems that can smartly complement the already existing nanotherapeutic platforms evaluated to treat or diagnose diseases. The valuable distinctive features of circulatory cells over synthetic nanocarriers encompass their biological origin which confers immune transparence, known biodegradability, high drug loading, relatively long half-life and a targeting capacity associated with their physiological surface functionality...
September 14, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28915214/non-hemodynamic-effects-of-catecholamines
#18
Clair Hartmann, Peter Radermacher, Martin Wepler, Benedikt Nußbaum
Circulatory shock is defined as an imbalance between tissue oxygen supply and demand, and mostly results from a loss of blood volume, cardiac pump failure, and/or reduction of vasomotor tone. The clinical hallmarks of circulatory shock are arterial hypotension and lactate acidosis. Since the degree and duration of hypotension are major determinants of outcome, vasopressor administration represents a cornerstone therapy to treat these patients. Current guidelines recommend the use of catecholamines as the drug of first choice...
October 2017: Shock
https://www.readbyqxmd.com/read/28913740/temporary-mechanical-circulatory-support-for-cardiogenic-shock
#19
REVIEW
Jean Touchan, Maya Guglin
Cardiogenic shock is a life-threatening presentation of severe heart failure with high morbidity and mortality. Given the modest increased in cardiac output and neutral/negative survival benefits with today's available inotropes (namely, dobutamine and milrinone), the use of mechanical circulatory support (MCS) has increased dramatically over the past 2 decades. In this review article, we discuss the physiologic concept, clinical evidence of benefit, and current use and indications/potential complications of the four most commonly used devices for MCS: intra-aortic balloon pump, Impella percutaneous ventricular assist device, TandemHeart, and extracorporeal membrane oxygenation (ECMO)...
September 14, 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28910547/diurnal-opposite-variation-between-angiotensinase-activities-in-photo-neuro-endocrine-tissues-of-rats
#20
Germán Domínguez-Vías, Garbiñe Aretxaga-Maza, Isabel Prieto, Juan de Dios Luna, Marc De Gasparo, Manuel Ramírez-Sánchez
Central and peripheral renin-angiotensin systems (RASs) act in a coordinated manner for the physiologic functions regulated by neuroendocrine events. However, whereas the diurnal rhythm of peripheral circulatory and tissue RASs is well known, the circadian behaviour of their components in central photo-neuro-endocrine structures, key elements for the control of circadian rhythms, has been barely studied. In the present study, we analysed the aspartyl- (AspAP) and glutamyl-aminopeptidase (GluAP) (aminopeptidase A) activities, the angiotensinases responsible for the metabolism of Ang I to Ang 2-10 and Ang II to Ang III, respectively, in the retina, anterior hypothalamus and pituitary at different light and dark time-points of a 12:12 h light:dark cycle (7-19 h light), using arylamide derivatives as substrates...
September 14, 2017: Chronobiology International
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