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Pulmonary vascular resistance

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https://www.readbyqxmd.com/read/29351227/differential-association-of-cx37-and-cx40-genetic-variants-in-atrial-fibrillation-with-and-without-underlying-structural-heart-disease
#1
Sebastian Carballo, Anna Pfenniger, David Carballo, Nicolas Garin, Richard W James, François Mach, Dipen Shah, Brenda R Kwak
Atrial fibrillation (AF) appears in the presence or absence of structural heart disease. The majority of foci causing AF are located near the ostia of pulmonary veins (PVs), where cardiomyocytes and vascular smooth muscle cells interdigitate. Connexins (Cx) form gap junction channels and participate in action potential propagation. Genetic variants in genes encoding Cx40 and Cx37 affect their expression or function and may contribute to PV arrhythmogenicity. DNA was obtained from 196 patients with drug-resistant, symptomatic AF with and without structural heart disease, who were referred for percutaneous catheter ablation...
January 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29348177/dasatinib-increases-endothelial-permeability-leading-to-pleural-effusion
#2
Carole Phan, Etienne-Marie Jutant, Ly Tu, Raphaël Thuillet, Andrei Seferian, David Montani, Alice Huertas, Jan van Bezu, Fabian Breijer, Anton Vonk Noordegraaf, Marc Humbert, Jurjan Aman, Christophe Guignabert
Pleural effusion is a frequent side-effect of dasatinib, a second-generation tyrosine kinase inhibitor used in the treatment of chronic myelogenous leukaemia. However, the underlying mechanisms remain unknown. We hypothesised that dasatinib alters endothelial integrity, resulting in increased pulmonary vascular endothelial permeability and pleural effusion.To test this, we established the first animal model of dasatinib-related pleural effusion, by treating rats with a daily regimen of high doses of dasatinib (10 mg·kg-1·day-1 for 8 weeks)...
January 2018: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/29345195/mitochondrial-dysfunction-and-pulmonary-hypertension-cause-effect-or-both
#3
Jeffrey D Marshall, Isabel Bazan, Yi Zhang, Wassim H Fares, Patty J Lee
Pulmonary hypertension describes a heterogeneous disease defined by increased pulmonary artery pressures, and progressive increase in pulmonary vascular resistance due to pathologic remodeling of the pulmonary vasculature involving pulmonary endothelial cells, pericytes, and smooth muscle cells.  This process occurs under various conditions, and though these populations vary, the clinical manifestations are the same: progressive dyspnea, increases in right ventricular (RV) afterload and dysfunction, RV-pulmonary artery uncoupling, and right-sided heart failure with systemic circulatory collapse...
January 18, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29343759/incorporation-of-iloprost-in-phospholipase-resistant-phospholipid-scaffold-enhances-its-barrier-protective-effects-on-pulmonary-endothelium
#4
Olga Oskolkova, Nicolene Sarich, Yufeng Tian, Grzegorz Gawlak, Fanyong Meng, Valery N Bochkov, Evgeny Berdyshev, Anna A Birukova, Konstantin G Birukov
Correction of barrier dysfunction and inflammation in acute lung injury (ALI) represents an important problem. Previous studies demonstrate barrier-protective and anti-inflammatory effects of bioactive lipid prostacyclin and its stable analog iloprost (ILO). We generated a phospholipase resistant synthetic phospholipid with iloprost attached at the sn-2 position (ILO-PC) and investigated its biological effects. In comparison to free ILO, ILO-PC caused sustained endothelial cell (EC) barrier enhancement, linked to more prolonged activation of Rap1 and Rac1 GTPases and their cytoskeletal and cell junction effectors: cortactin, PAK1, p120-catenin and VE-cadherin...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343014/-correlation-between-peripheral-venous-oxygen-saturation-and-hemodynamic-parameters-in-patients-with-pulmonary-hypertension
#5
C Hong, J Y Li, R K Chen, C L Liu, X N Wang, S M Qing, X F Su, N F Zhang
Objective: To investigate the correlation of peripheral venous oxygen saturation (SpvO(2)) with mixed venous oxygen saturation (SvO(2)), pulmonary vascular resistance (PVR) and cardiac index (CI) in patients with pulmonary hypertension (PH), in order to predict these parameters using SpvO(2) and assess the prognosis of patients. Methods: Hospitalized patients diagnosed with PH by right heart catheterization in the Guangzhou Institute of Respiratory Diseases from July 2015 to October 2016 were retrospectively analyzed...
January 12, 2018: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29342993/-analysis-of-prognosis-and-associated-risk-factors-in-pediatric-idiopathic-pulmonary-arterial-hypertension
#6
Q Liu, C Zhang, Q Q Li, Y Zhu, D Zhang, W G Zhao, H Gu
Objective: To analyze the prognosis and associated risk factors of pediatric idiopathic pulmonary arterial hypertension. Methods: A total of 119 patients under 18 years of age diagnosed as idiopathic pulmonary arterial hypertension in the Pulmonary Arterial Hypertension Center in Beijing Anzhen Hospital between June 2007 and May 2017 were enrolled in this retrospective study. The clinical informations and follow-up data were collected. The endpoints of follow-up were defined as death or undergoing lung transplantation...
January 2, 2018: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/29338918/filling-pressures-in-fontan-revisited-comparison-between-pulmonary-artery-wedge-ventricular-end-diastolic-and-left-atrial-pressures-in-adults
#7
William R Miranda, Alexander C Egbe, Donald J Hagler, Nathaniel W Taggart, Rick A Nishimura, Heidi M Connolly, Carole A Warnes
BACKGROUND: Pulmonary artery wedge pressure (PAWP) has been shown to correlate better with left atrial pressure (LAP) than ventricular end-diastolic pressure (VEDP) in acquired heart disease. The correlation between VEDP and PAWP and their performance as surrogates for LAP in Fontan patients is unknown. METHODS: Offline single-beat simultaneous measurement of PAWP and VEDP was performed in 50 adult Fontan patients and non-simultaneous hemodynamic data abstracted for calculation of pulmonary vascular resistance (PVR)...
December 28, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29334508/practical-valvular-issues-in-patients-requiring-ventricular-assist-devices
#8
Mitesh Badiwala, Terrence Yau
PURPOSE OF REVIEW: As ventricular assist device (VAD) therapy in patients with advanced heart failure continues to grow, experience with concomitant valvular diseases present either before or after VAD implantation continues to accrue. In this review, we discuss recent data and current practice as it pertains to the subject of concomitant valvular disease in patients requiring VADs. RECENT FINDINGS: Persistent aortic valve closure has been identified as a potential contributor to aortic valve 'disuse atrophy' resulting in valve degeneration...
January 13, 2018: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/29329761/n-terminal-pro-b-type-natriuretic-peptide-for-monitoring-after-balloon-pulmonary-angioplasty-for-chronic-thromboembolic-pulmonary-hypertension
#9
Steffen D Kriechbaum, Christoph B Wiedenroth, Jan Sebastian Wolter, Regula Hütz, Moritz Haas, Andreas Breithecker, Fritz C Roller, Till Keller, Stefan Guth, Andreas Rolf, Christian W Hamm, Eckhard Mayer, Christoph Liebetrau
BACKGROUND: Balloon pulmonary angioplasty (BPA) is an emerging interventional treatment option for chronic thromboembolic pulmonary hypertension (CTEPH). The non-invasive monitoring of CTEPH patients is a clinical challenge. In this study we examined changes in N-terminal pro-B-type natriuretic peptide (NT-proBNP) in patients undergoing BPA for inoperable CTEPH and related them to peri-procedural success. METHODS: In this study we analyzed a total of 51 consecutive patients who underwent BPA treatment and completed a 6-month follow-up (6-MFU) between March 2014 and March 2017...
December 8, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/29324062/four-day-pulse-of-sodium-cromoglycate-modulates-pulmonary-vessel-wall-remodeling-during-21-day-hypoxia-in-rats
#10
Tomáš Novotný, Jiří Uhlík, Luděk Vajner
AIM OF THE STUDY: Remodeling of pulmonary resistance arteries in rats due to 4-day hypoxia could be successfully suppressed by sodium cromoglycate. In this study, we tested the difference in the suppression between two distinct time patterns of cromoglycate administration during 21-day hypoxia. In the experiment, we focused on some details in both smooth muscle cells and extracellular matrix of pulmonary arterial walls. METHODS: During 21-day hypoxia, rats were treated with sodium cromoglycate either in the first four days or in the last four days...
January 11, 2018: Experimental Lung Research
https://www.readbyqxmd.com/read/29321132/intersection-of-pulmonary-hypertension-and-right-ventricular-dysfunction-in-patients-on-left-ventricular-assist-device-support-is-there-a-role-for-pulmonary-vasodilators
#11
Christopher T Sparrow, Shane J LaRue, Joel D Schilling
Left ventricular assist devices (LVADs) improve survival and quality of life in patients with advanced heart failure. Despite these benefits, combined post- and precapillary pulmonary hypertension can be particularly problematic in patients on LVAD support, often exacerbating right ventricular (RV) dysfunction. Both persistently elevated pulmonary vascular resistance and RV dysfunction are associated with adverse outcomes, including death after LVAD. These observations have led to significant interest in the use of pulmonary vasodilators to treat pulmonary hypertension and preserve RV function among LVAD-supported patients...
January 2018: Circulation. Heart Failure
https://www.readbyqxmd.com/read/29318791/impact-of-balloon-pulmonary-angioplasty-on-hemodynamics-and-clinical-outcomes-in-patients-with-chronic-thromboembolic-pulmonary-hypertension-the-initial-korean-experience
#12
Woochan Kwon, Jeong Hoon Yang, Taek Kyu Park, Sung A Chang, Dong Seop Jung, Young Seok Cho, Sung Mok Kim, Tae Jung Kim, Hye Yoon Park, Seung Hyuk Choi, Duk Kyung Kim
BACKGROUND: The treatment of choice for chronic thromboembolic pulmonary hypertension (CTEPH) is pulmonary endarterectomy (PEA). However, not all patients are eligible for PEA, and some patients experience recurrence of pulmonary hypertension even after PEA. METHODS: Patients who underwent balloon pulmonary angioplasty (BPA) between December 2015 and April 2017 were enrolled from the Samsung Medical Center CTEPH registry. Enrolled patients underwent right heart catheterization, echocardiography, and 6-minute walk distance (6MWD) at baseline, 4 and 24 weeks after their first BPA session...
January 22, 2018: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/29316988/idiopathic-pulmonary-arterial-hypertension-with-coexisting-chd
#13
Thomas G Day, Marina Hughes, Bejal Pandya
Sinus venosus atrial septal defect can result in an increase in pulmonary blood flow and vascular resistance, leading to pulmonary hypertension. Rarely, the degree of pulmonary hypertension is out of proportion to the degree of intra-cardiac shunting. This case outlines the differences between pulmonary hypertension secondary to CHD and idiopathic pulmonary hypertension, and illustrates the investigation and management strategy used in a patient with features of both.
January 10, 2018: Cardiology in the Young
https://www.readbyqxmd.com/read/29316567/modern-invasive-hemodynamic-assessment-of-pulmonary-hypertension
#14
Alberto Pagnamenta, Frédéric Lador, Andrea Azzola, Maurice Beghetti
Since 1998 pulmonary hypertension has been clinically classified into five well-defined, distinct categories. A definitive diagnosis of pulmonary hypertension requires the invasive confirmation of an elevated mean pulmonary artery pressure of 25 mm Hg or above during a right heart catheterization. From a hemodynamic point of view, pulmonary hypertension is classified into precapillary and postcapillary pulmonary hypertension on the basis of a pulmonary artery wedge pressure threshold value of 15 mm Hg. Pulmonary vascular resistance is better characterized by multi-point pressure/flow measurements than by single-point determination...
January 9, 2018: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/29310945/image-based-computational-assessment-of-vascular-wall-mechanics-and-hemodynamics-in-pulmonary-arterial-hypertension-patients
#15
Byron A Zambrano, Nathan A McLean, Xiaodan Zhao, Ju-Le Tan, Liang Zhong, C Alberto Figueroa, Lik Chuan Lee, Seungik Baek
Pulmonary arterial hypertension (PAH) is a disease characterized by an elevated pulmonary arterial (PA) pressure. While several computational hemodynamic models of the pulmonary vasculature have been developed to understand PAH, they are lacking in some aspects, such as the vessel wall deformation and its lack of calibration against measurements in humans. Here, we describe a computational modeling framework that addresses these limitations. Specifically, computational models describing the coupling of hemodynamics and vessel wall mechanics in the pulmonary vasculature of a PAH patient and a normal subject were developed...
December 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29310938/evaluation-of-the-clinical-utility-of-transesophageal-echocardiography-and-invasive-monitoring-to-assess-right-ventricular-function-during-and-after-pulmonary-endarterectomy
#16
Thomas P Sullivan, James E Moore, Andrew A Klein, David P Jenkins, Lynne K Williams, Andrew Roscoe, Wendy Tsang
OBJECTIVE: Patients undergoing pulmonary endarterectomy (PEA) have impaired right ventricular function. The authors sought to assess the clinical utility of commonly used perioperative echocardiographic and right heart catheter measurements in patients undergoing PEA. DESIGN: A single-center prospective observational study. SETTING: The study was conducted in a quaternary care cardiac surgical center in the United Kingdom. PARTICIPANTS: Patients undergoing PEA between April 2015 and January 2016...
September 21, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29305367/embolic-stroke-in-a-postpartum-patient-with-fontan-physiology
#17
Katherine VanHise, Linda Li, Emily Smith, Niamh Condon
In cardiac physiology, single ventricle typically refers to the presence of a dominant systemic ventricle along with a hypoplastic ventricle. The Fontan operation is used to repair the single ventricle by directing deoxygenated systemic venous flow to the pulmonary arterial circulation. Normal pregnancy physiology, particularly increased intravascular volume, increased heart rate, increased cardiac output, hypercoagulability and decreased systemic vascular resistance, can exacerbate cardiac disease in patients with Fontan circulation, leading to pregnancy complications...
January 5, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29300906/postoperative-left-ventricular-function-in-different-types-of-pulmonary-hypertension-a-comparative-study
#18
Tom Verbelen, Alexander Van De Bruaene, Bjorn Cools, Dirk Van Raemdonck, Marion Delcroix, Filip Rega, Bart Meyns
OBJECTIVES: Left ventricular dysfunction after pulmonary endarterectomy is well described. Left ventricular failure has only been described after lung transplantation for pulmonary arterial hypertension (PAH). We sought to identify factors that contribute to this failure and hypothesized that atrial septostomy before transplantation could prevent this complication. METHODS: From our database, all bilateral lung transplants for PAH (n = 24) and all pulmonary endarterectomies, with a minimal reduction of 800 dyn⋅s⋅cm-5 (n = 27), were selected...
January 2, 2018: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29298188/sphingosine-kinase-1-regulates-inflammation-and-contributes-to-acute-lung-injury-in-pneumococcal-pneumonia-via-the-sphingosine-1-phosphate-receptor-2
#19
Birgitt Gutbier, Stefanie M Schönrock, Carolin Ehrler, Rainer Haberberger, Kristina Dietert, Achim D Gruber, Wolfgang Kummer, Laura Michalick, Wolfgang M Kuebler, Andreas C Hocke, Kolja Szymanski, Eleftheria Letsiou, Anja Lüth, Fabian Schumacher, Burkhard Kleuser, Timothy J Mitchell, Wilhelm Bertrams, Bernd Schmeck, Denise Treue, Frederick Klauschen, Torsten T Bauer, Mario Tönnies, Norbert Weissmann, Stefan Hippenstiel, Norbert Suttorp, Martin Witzenrath
OBJECTIVES: Severe pneumonia may evoke acute lung injury, and sphingosine-1-phosphate is involved in the regulation of vascular permeability and immune responses. However, the role of sphingosine-1-phosphate and the sphingosine-1-phosphate producing sphingosine kinase 1 in pneumonia remains elusive. We examined the role of the sphingosine-1-phosphate system in regulating pulmonary vascular barrier function in bacterial pneumonia. DESIGN: Controlled, in vitro, ex vivo, and in vivo laboratory study...
January 2, 2018: Critical Care Medicine
https://www.readbyqxmd.com/read/29290032/foxm1-promotes-pulmonary-artery-smooth-muscle-cell-expansion-in-pulmonary-arterial-hypertension
#20
Alice Bourgeois, Caroline Lambert, Karima Habbout, Benoit Ranchoux, Stéphanie Paquet-Marceau, Isabelle Trinh, Sandra Breuils-Bonnet, Renée Paradis, Valérie Nadeau, Roxane Paulin, Steeve Provencher, Sébastien Bonnet, Olivier Boucherat
Pulmonary arterial hypertension (PAH) is a progressive vascular remodeling disease characterized by a persistent elevation of pulmonary artery pressure, leading to right heart failure and premature death. Exaggerated proliferation and resistance to apoptosis of pulmonary artery smooth muscle cells (PASMCs) is a key component of vascular remodeling. Despite major advances in the field, current therapies for PAH remain poorly effective in reversing the disease or significantly improving long-term survival. Because the transcription factor FOXM1 is necessary for PASMC proliferation during lung morphogenesis and its overexpression stimulates proliferation and evasion of apoptosis in cancer cells, we thus hypothesized that upregulation of FOXM1 in PAH-PASMCs promotes cell expansion and vascular remodeling...
December 30, 2017: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
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