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https://www.readbyqxmd.com/read/28829513/mechanisms-of-oxidative-stress-effects-of-the-nadph-oxidase-ros-nf-%C3%AE%C2%BAb-transduction-pathway-and-vpo1-on-patients-with-chronic-obstructive-pulmonary-disease-combined-with-pulmonary-hypertension
#1
B Zhuan, Y Yu, Z Yang, X Zhao, P Li
OBJECTIVE: This study explored the oxidative stress effects of the NADPH oxidase-ROS-NF-κB transduction pathway and vascular peroxidase 1 (VPO1) on patients with chronic obstructive pulmonary disease (COPD) combined with pulmonary hypertension (PH). PATIENTS AND METHODS: 30 patients with pure COPD and 30 patients with stable COPD combined with PH, who were admitted to our hospital from January 2015 to December 2015, were enrolled as the control group and the observation group, respectively...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28798201/remote-ischemic-preconditioning-does-not-prevent-acute-mountain-sickness-after-rapid-ascent-to-3450-m
#2
Marc M Berger, Franziska Macholz, Lukas Lehmann, Daniel Dankl, Marcel Hochreiter, Bernhard Bacher, Peter Bärtsch, Heimo Mairbäurl
Remote ischemic preconditioning (RIPC) has been shown to protect remote organs, such as the brain and the lung, from damage induced by subsequent hypoxia or ischemia. Acute mountain sickness (AMS) is a syndrome of non-specific neurologic symptoms and in high altitude pulmonary edema excessive hypoxic pulmonary vasoconstriction (HPV) plays a pivotal role. We hypothesized that RIPC protects the brain from AMS and attenuates the magnitude of HPV after rapid ascent to 3450 m. Forty non-acclimatized volunteers were randomized into 2 groups...
August 10, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28756635/can-adma-play-a-role-in-determining-pulmonary-hypertension-related-to-chronic-obstructive-pulmonary-disease
#3
Selda Telo, Gamze Kırkıl, Mutlu Kuluöztürk, Mehmet Balin, Figen Deveci
BACKGROUND AND AIMS: Asymmetric dimethylarginine (ADMA) decreases the levels of nitric oxide by inhibiting nitric oxide synthases. In this study, the possible role of ADMA in determining pulmonary hypertension (PH) in chronic obstructive pulmonary disease (COPD) patients was investigated. METHODS: Stable COPD patients who were admitted to pulmonology outpatient clinic were involved in the study. Forty healthy volunteers, with similar ages and sexes, were accepted as the control group...
July 29, 2017: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/28734909/prognostic-value-of-exercise-stress-echocardiography-in-asymptomatic-patients-with-aortic-valve-stenosis
#4
Coppelia Goublaire, Maria Melissopoulou, David Lobo, Naozumi Kubota, Constance Verdonk, Claire Cimadevilla, Isabelle Codogno, Eric Brochet, Alec Vahanian, David Messika-Zeitoun
OBJECTIVES: This study sought to evaluate the prognostic value of mean pressure gradient (MPG) increase and peak systolic pulmonary artery pressure (SPAP) measured during exercise stress echocardiography in asymptomatic patients with aortic stenosis (AS). BACKGROUND: Exercise testing is recommended in asymptomatic AS patients, but the additional value of exercise-stress echocardiography, especially the prognostic value of MPG increase and peak SPAP, is still debated...
July 13, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28705939/changes-in-pulmonary-exercise-haemodynamics-in-scleroderma-a-4-year-prospective-study
#5
Gabor Kovacs, Alexander Avian, Nora Wutte, Franz Hafner, Florentine Moazedi-Fürst, Sonja Kielhauser, Elisabeth Aberer, Marianne Brodmann, Winfried Graninger, Vasile Foris, Andrea Olschewski, Horst Olschewski
Pulmonary arterial hypertension (PAH) is a feared complication of systemic sclerosis. In this prospective cohort study, we monitored the changes in resting and exercise pulmonary haemodynamics of scleroderma patients without initial PAH over a mean follow-up period of ∼4 years.All patients underwent exercise echocardiography and cardiopulmonary exercise testing at baseline and follow-up. A subgroup underwent exercise right heart catheter (RHC) investigations. The primary end-point was the echocardiographic systolic pulmonary arterial pressure at 50 W exercise (sPAP50)...
July 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28689751/postprocedural-changes-of-tricuspid-regurgitation-after-mitraclip-therapy-for-mitral-regurgitation
#6
MULTICENTER STUDY
Kentaro Toyama, Kengo Ayabe, Saibal Kar, Shunsuke Kubo, Toshinori Minamishima, Florian Rader, Takahiro Shiota, Toshihiko Nishioka, Robert J Siegel
The effect of percutaneous mitral valve repair using the MitraClip system on tricuspid regurgitation (TR) has not been well investigated. We retrospectively analyzed 102 consecutive patients who underwent the successful MitraClip procedure, and who also had a preprocedural and 1-year follow-up transthoracic echocardiography. TR severity was graded by standard guideline-recommended criteria. At 1 year after the MitraClip procedure, the degree of TR regressed (at least 1 grade) in 23% of the patients, was unchanged in 62% of the patients, and progressed in 16% of the patients...
September 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28664832/clinical-determinants-of-elevated-systolic-pulmonary-artery-pressure-measured-by-transthoracic-doppler-echocardiography-in-early-systemic-sclerosis
#7
Patricia E Carreira, Loreto Carmona, Beatriz E Joven, Estibaliz Loza, Jose Luis Andreu, Gabriela Riemekasten, Serena Vettori, Yannick Allanore, Alexandra Balbir-Gurman, Paolo Airò, Ulrich A Walker, Nemanja Damjanov, Lidia P Ananieva, Simona Rednic, László Czirják, Oliver Distler, Dominique Farge, Roger Hesselstrand, Ada Corrado, Paola Caramaschi, Mohammed Tikly, Marco Matucci-Cerinic
OBJECTIVES: To explore the prevalence and clinical associations of elevated systolic pulmonary artery pressure (sPAP), measured by Transthoracic Doppler-echocardiography (TTE) in patients with early systemic sclerosis (SSc). METHODS: A cross-sectional analysis of the prospective EULAR Scleroderma Trial and Research (EUSTAR) database was performed. SSc patients with <3 years from the first non-Raynaud's phenomenon (RP) symptom at baseline EUSTAR visit, were selected...
June 20, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28664478/the-integrated-value-of-sst2-and-global-longitudinal-strain-in-the-early-stratification-of-patients-with-severe-aortic-valve-stenosis-a-translational-imaging-approach
#8
Iacopo Fabiani, Lorenzo Conte, Nicola Riccardo Pugliese, Enrico Calogero, Valentina Barletta, Rossella Di Stefano, Tatiana Santoni, Cristian Scatena, Uberto Bortolotti, Antonio Giuseppe Naccarato, Anna Sonia Petronio, Vitantonio Di Bello
Aortic valve stenosis (AVS) is associated with significant myocardial fibrosis (MF). Global longitudinal strain (GLS) is a sensible indicator of systolic dysfunction. ST2 is a member of the interleukin (IL)-1 receptor family and a modulator of hypertrophic and fibrotic responses. We aimed at assessing: (a) the association between adverse LV remodeling, LV functional parameters (including GLS) and sST2 level. (b) The association between MF (detected by endo-myocardial biopsy) and sST2 in patients with AVS undergoing surgical valve replacement...
June 29, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28659997/24-hour-hypoxia-and-pulmonary-hypertension-in-patients-with-idiopathic-pulmonary-fibrosis
#9
Marcelo P Rodrigues, Carolina M Vissoci, Samuel P Rosa, Sandra B C Negreiros
BACKGROUND: The quantification of hypoxia based on resting partial pressure of arterial oxygen (PaO2) may underestimate hypoxia related to activities of daily living or sleep and thus not accurately reflect pulmonary hypertension (PH). The aim of the present study was to investigate the association of resting PaO2 with percent time of SpO2 below 90% (T90) and 88% (T88) in 24 hours. We also evaluated the capacity of hypoxia measures to predict PH in patients with idiopathic pulmonary fibrosis (IPF)...
2017: Open Respiratory Medicine Journal
https://www.readbyqxmd.com/read/28631361/optimal-right-heart-filling-pressure-in-acute-respiratory-distress-syndrome-determined-by-strain-echocardiography
#10
Romel Garcia-Montilla, Faryal Imam, Mi Miao, Kathryn Stinson, Akram Khan, Stephen Heitner
INTRODUCTION: Right ventricular (RV) systolic dysfunction is common in acute respiratory distress syndrome (ARDS). While preload optimization is crucial in its management, dynamic fluid responsiveness indices lack reliability, and there is no consensus on target central venous pressure (CVP). We analyzed the utility of RV free wall longitudinal strain (RVFWS) in the estimation of optimal RV filling pressure in ARDS. METHODS: A retrospective cross-sectional analysis of clinical data and echocardiograms of patients with ARDS was performed...
June 2017: Echocardiography
https://www.readbyqxmd.com/read/28597767/increased-mortality-from-complications-of-pulmonary-hypertension-in-patients-undergoing-transcatheter-aortic-valve-replacement
#11
Raj Parikh, Benson Varghese, Huma N Khatoon, Julie A Kovach, Clifford J Kavinsky, Rajive Tandon
Aortic stenosis (AS) leads to pulmonary hypertension (PH) and right ventricle (RV) failure. Our goal was to describe mortality related to postoperative complications in PH patients undergoing transcatheter aortic valve replacement (TAVR). Ninety-three TAVR patients were analyzed (controls, sPAP < 50 mmHg; cases, sPAP ≥ 50 mmHg). Significant findings in cases included increased mortality (365 days), post-TAVR atrioventricular block (AVB) and acute kidney injury (AKI), and increased mean length of stay (LOS)...
April 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28567481/analysis-of-sucrose-induced-small-rnas-in-streptococcus-mutans-in-the-presence-of-different-sucrose-concentrations
#12
Shan Shan Liu, Wen Hui Zhu, Qing Hui Zhi, Jia Liu, Yan Wang, Huan Cai Lin
Streptococcus mutans (S. mutans) is the major pathogen contributing to dental caries. Sucrose is an important carbohydrate source for S. mutans and is crucial for dental caries. Small RNAs (sRNAs) are key post-transcriptional regulators of stress adaptation and virulence in bacteria. Here, for the first time, we created three replicate RNA libraries exposed to either 1 or 5% sucrose. The expression levels of sRNAs and target genes (gtfB, gtfC, and spaP) related to virulence were assessed. In addition, some phenotypic traits were evaluated...
May 31, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28553693/assessment-of-right-ventricular-longitudinal-strain-by-2d-speckle-tracking-imaging-compared-with-rv-function-and-hemodynamics-in-pulmonary-hypertension
#13
Yidan Li, Yidan Wang, Xiangli Meng, Weiwei Zhu, Xiuzhang Lu
The right ventricular longitudinal strain (RVLS) of pulmonary hypertension (PH) patients and its relationship with RV function parameters measured by echocardiography and hemodynamic parameters measured by right heart catheterization was investigated. According to the WHO functional class (FC), 66 PH patients were divided into FC I/II (group 1) and III/IV (group 2). RV function parameters were measured by echocardiographic examinations. Hemodynamic parameters were obtained by right heart catheterization. Patients in group 2 had higher systolic pulmonary artery pressure (sPAP; P < 0...
May 29, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28545821/surgical-management-of-severe-ischaemic-mitral-regurgitation
#14
Yong Zhang, Dongxu Wang, Yu Liu, Dengshun Tao, Yan Jin, Hui Jiang, Zengwei Wang, Huishan Wang
BACKGROUND: Coronary artery bypass graft surgery (CABG) with mitral valve surgery is undisputed in severe ischaemic mitral regurgitation (IMR) treatment, but the controversy is whether mitral valve replacement (MVR) or mitral valvuloplasty (MVP) should be used. METHODS: Data was collected from 130 cases of severe IMR patients who underwent CABG and MVP or MVR from June 2010 to June 2015 to compare the short-term efficacy of CABG with MVP or MVR in the treatment of severe IMR patients...
May 9, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28531295/right-ventricular-vascular-coupling-in-heart-failure-with-preserved-ejection-fraction-and-pre-vs-post-capillary-pulmonary-hypertension
#15
Thomas M Gorter, Dirk J van Veldhuisen, Adriaan A Voors, Yoran M Hummel, Carolyn S P Lam, Rolf M F Berger, Joost P van Melle, Elke S Hoendermis
Aims: Many patients with heart failure with preserved ejection fraction (HFpEF) develop post-capillary pulmonary hypertension (PH) due to increased left-sided filling pressures. However, a subset of patients develops combined post- and pre-capillary PH. We studied the value of echocardiographic right-sided characterization for the discrimination between pre- vs. post-capillary PH in HFpEF, using invasive haemodynamics as gold standard. Methods and results: 102 consecutive HFpEF patients with simultaneous right heart catheterization and echocardiography were identified...
May 22, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28530170/k-modulates-genetic-competence-and-the-stress-regulon-of-streptococcus-mutans
#16
Gursonika Binepal, Iwona B Wenderska, Paula Crowley, Richard N Besingi, Dilani B Senadheera, L Jeannine Brady, Dennis G Cvitkovitch
Potassium (K+) is the most abundant cation in dental plaque fluid. Previously, we reported the link between K+ transport via Trk2 in Streptococcus mutans and its two critical virulence attributes: acid tolerance and surface adhesion. Herein, we build further on the intimate link between K+ levels and S. mutans biology. High (>25 mM) versus low (≤5 mM) K+ concentrations in the growth medium affected conformational epitopes of cell surface-localized adhesin P1. At low K+, the expression of stress response elements gcrR and codY, cell-adhesion-associated genes such as spaP and metabolism-associated genes such as bglP was induced at stationary phase (P<0...
May 22, 2017: Microbiology
https://www.readbyqxmd.com/read/28526785/effects-of-arginine-on-growth-virulence-gene-expression-and-stress-tolerance-by-streptococcus-mutans
#17
Brinta Chakraborty, Robert A Burne
Streptococcus mutans is a common constituent of oral biofilms and a primary etiologic agent of human dental caries. The bacteria associated with dental caries have a potent ability to produce organic acids from dietary carbohydrates and to grow and metabolize in acidic conditions. In contrast, many commensal bacteria produce ammonia through the arginine deiminase system (ADS), which moderates the pH of oral biofilms. Arginine metabolism by the ADS is a significant deterrent to the initiation and progression of dental caries...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28526545/obstructive-sleep-apnoea-and-right-ventricular-function-a-combined-assessment-by-speckle-tracking-and-three-dimensional-echocardiography
#18
Agostino Buonauro, Maurizio Galderisi, Ciro Santoro, Angelo Canora, Maria Luisa Bocchino, Francesco Lo Iudice, Maria Lembo, Roberta Esposito, Sabrina Castaldo, Bruno Trimarco, Alessandro Sanduzzi
BACKGROUND: Little is known on right ventricular (RV) involvement in obstructive sleep apnoea (OSA). This study aimed at evaluating early RV dysfunction by standard and advanced echocardiography in OSA. METHODS: Fifty-nine OSA patients without heart failure and 29 age-matched controls underwent standard, speckle tracking and real time 3D echocardiography of right ventricle. OSA patients performed lung function tests and overnight cardio-respiratory monitoring with evaluation of apnea-hypopnea index (AHI)...
September 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28524032/-preoperative-risk-factors-analysis-of-pulmonary-hypertension-crisis-during-perioperative-period-for-caesarean-section-of-woman-with-severe-pulmonary-hypertension
#19
Chunlei Zhang, Yaguang Liu, Enming Qing, Jun Ma
OBJECTIVE: To analyze preoperative risk factors of perioperative pulmonary hypertension crisis (PHC) for pregnant woman with severe pulmonary artery hypertension (PAH), and approach its clinical value. METHODS: A retrospective analysis was conducted. The clinical data from 152 pregnant women with severe PAH underwent cesarean delivery admitted to Beijing Anzhen Hospital from January 1st 2008 to December 31st 2016 was collected. The patients were divided into two groups according to with perioperative PHC or not...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28517026/impact-of-severe-tricuspid-regurgitation-on-accuracy-of-systolic-pulmonary-arterial-pressure-measured-by-doppler-echocardiography-analysis-in-an-unselected-patient-population
#20
Beini Fei, Ting Fan, Ling Zhao, Xiaoli Pei, Xianhong Shu, Xiaoyan Fang, Leilei Cheng
Pulmonary arterial pressure is an important index in cardiovascular disorders, especially for pulmonary hypertension (PH). Doppler echocardiography (DE) is widely used as a noninvasive method to assess pulmonary arterial pressure. However, recent studies have found several hemodynamic factors that affect its accuracy in estimating systolic pulmonary arterial pressure (sPAP). But the effect of tricuspid regurgitation (TR) has not been investigated. Therefore, our study is aimed to determine whether the severity of TR will affect the accuracy of sPAP measured by DE in an unselected patient population...
May 18, 2017: Echocardiography
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