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https://www.readbyqxmd.com/read/29780328/contractile-activity-is-necessary-to-trigger-intermittent-hypobaric-hypoxia-induced-fiber-size-and-vascular-adaptations-in-skeletal-muscle
#1
David Rizo-Roca, Jèssica B Bonet, Büsra Ínal, Juan Gabriel Ríos-Kristjánsson, Teresa Pagès, Ginés Viscor, Joan R Torrella
Altitude training has become increasingly popular in recent decades. Its central and peripheral effects are well-described; however, few studies have analyzed the effects of intermittent hypobaric hypoxia (IHH) alone on skeletal muscle morphofunctionality. Here, we studied the effects of IHH on different myofiber morphofunctional parameters, investigating whether contractile activity is required to elicit hypoxia-induced adaptations in trained rats. Eighteen male Sprague-Dawley rats were trained 1 month and then divided into three groups: (1) rats in normobaria (trained normobaric inactive, TNI); (2) rats subjected daily to a 4-h exposure to hypobaric hypoxia equivalent to 4,000 m (trained hypobaric inactive, THI); and (3) rats subjected daily to a 4-h exposure to hypobaric hypoxia just before performing light exercise (trained hypobaric active, THA)...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29771155/cardiac-events-within-one-year-after-a-subarachnoid-haemorrhage-the-predictive-value-of-troponin-elevation-after-aneurysm-occlusion
#2
Annemarie Akkermans, Linda M Peelen, Judith A van Waes, Gabriël J Rinkel, Wilton A van Klei
Background Patients who survive after an aneurysmal subarachnoid haemorrhage (ASAH) have an increased incidence of cardiovascular events compared with the general population. We assessed whether troponin elevation after aneurysm occlusion, as marker of myocardial injury, can predict long-term cardiac events. Methods We analysed a prospectively collected cohort of 159 patients with ASAH and early aneurysm occlusion, in whom routine post-intervention troponin I (TnI) measurements were performed. With competing risk regression modelling we estimated the association between TnI elevation after aneurysm occlusion and major adverse cardiac events within one year...
January 1, 2018: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/29767633/nanopatterning-on-calixarene-thin-films-via-low-energy-field-emission-scanning-probe-lithography
#3
Xiaoyue He, Peng Li, Pengchong Liu, Xiaoxian Zhang, Xiangqian Zhou, Wei Liu, Xiaohui Qiu
Field-emitted, low-energy electrons from the conducting tip of an atomic force microscope were adopted for nanolithography on calixarene ultrathin films coated on silicon wafers. A structural evolution from protrusion to depression down to a 30 nm spatial resolution was reproducibly obtained by tuning the sample voltage and exposure current in the lithography process. Close analyses of the profiles showed that the nanostructures formed by a single exposure with a high current are almost identical to those created by cumulative exposure with a lower current but an equal number of injected electrons...
May 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29743019/predictive-biomarkers-for-death-and-rehospitalization-in-comorbid-frail-elderly-heart-failure-patients
#4
Cristina Pacho, Mar Domingo, Raquel Núñez, Josep Lupón, Julio Núñez, Jaume Barallat, Pedro Moliner, Marta de Antonio, Javier Santesmases, Germán Cediel, Santiago Roura, M Cruz Pastor, Jordi Tor, Antoni Bayes-Genis
BACKGROUND: Heart failure (HF) is associated with a high rate of readmissions within 30 days post-discharge and in the following year, especially in frail elderly patients. Biomarker data are scarce in this high-risk population. This study assessed the value of early post-discharge circulating levels of ST2, NT-proBNP, CA125, and hs-TnI for predicting 30-day and 1-year outcomes in comorbid frail elderly patients with HF with mainly preserved ejection fraction (HFpEF). METHODS: Blood samples were obtained at the first visit shortly after discharge (4...
May 9, 2018: BMC Geriatrics
https://www.readbyqxmd.com/read/29738042/biomarkers-of-cardio-renal-syndrome-in-uremic-myocardiopathy-animal-model
#5
Laura Mattana Dionísio, Mateus Justi Luvizoto, Caroline Gribner, Danielle Carneiro, Viviane Carvalho, Franciele Robes, Marcos Sheidemantel, Fabiane Rego, Lúcia de Noronha, Roberto Pecoits-Filho, Aline Borsato Hauser
INTRODUCTION: Cardio-renal syndrome subtype 4 (CRS4) is a condition of primary chronic kidney disease that leads to reduction of cardiac function, ventricular hypertrophy, and risk of cardiovascular events. OBJECTIVE: Our aim was to understand the mechanisms involved on the onset of CRS4. METHODS: We used the nephrectomy 5/6 (CKD) animal model and compared to control (SHAM). Serum biomarkers were analyzed at baseline, 4, and 8 weeks. After euthanasia, histology and immunohistochemistry were performed in the myocardium...
May 7, 2018: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/29721000/association-between-preoperative-high-sensitive-troponin-i-levels-and-cardiovascular-events-after-hip-fracture-surgery-in-the-elderly
#6
Bum Sung Kim, Tae-Hoon Kim, Jeong-Hwan Oh, Chang Hee Kwon, Sung Hea Kim, Hyun-Joong Kim, Heung Kon Hwang, Sang-Man Chung
Objective: Cardiovascular complications contribute to postoperative morbidity and mortality in elderly hip fracture patients. Limited data are available regarding which preoperative risk factors predict cardiovascular course following hip fracture surgery (HFS). We used high sensitive troponin I (hs-TnI) assays and clinical parameters to identify preoperative risk factors associated with major adverse cardiac events (MACE) in elderly hip fracture patients. Method: From August 2014 to November 2016, 575 patients with hip fracture were enrolled in a retrospective, single-center registry...
March 2018: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/29628129/comparison-of-the-association-between-high-sensitivity-troponin-i-and-adverse-cardiovascular-outcomes-in-patients-with-versus-without-chronic-kidney-disease
#7
Pratik B Sandesara, Wesley T O'Neal, Ayman Samman Tahhan, Salim S Hayek, Suegene K Lee, Jay Khambhati, Matthew L Topel, Muhammad Hammadah, Ayman Alkhoder, Yi-An Ko, Mohamad Mazen Gafeer, Agim Beshiri, Gillian Murtagh, Jonathan H Kim, Peter Wilson, Leslee Shaw, Stephen E Epstein, Laurence S Sperling, Arshed A Quyyumi
It is unknown whether the association of high-sensitivity troponin I (hs-TnI) with adverse cardiovascular outcomes varies by the presence of chronic kidney disease (CKD). We examined the association of hs-TnI with adverse cardiovascular outcomes in those with and without CKD in 4,107 (mean age, 64 years; 63% men; 20% black) patients from the Emory Cardiovascular Biobank who underwent coronary angiography. CKD (n = 1,073) was defined as estimated glomerular filtration rate <60 ml/min/1.73 m2 or urine albumin/creatinine ratio >30 mg/g at baseline...
March 14, 2018: American Journal of Cardiology
https://www.readbyqxmd.com/read/29626890/electron-transfer-driven-decomposition-of-adenine-and-selected-analogs-as-probed-by-experimental-and-theoretical-methods
#8
T Cunha, M Mendes, F Ferreira da Silva, S Eden, G García, M-C Bacchus-Montabonel, P Limão-Vieira
We report on a combined experimental and theoretical study of electron-transfer-induced decomposition of adenine (Ad) and a selection of analog molecules in collisions with potassium (K) atoms. Time-of-flight negative ion mass spectra have been obtained in a wide collision energy range (6-68 eV in the centre-of-mass frame), providing a comprehensive investigation of the fragmentation patterns of purine (Pu), adenine (Ad), 9-methyl adenine (9-mAd), 6-dimethyl adenine (6-dimAd), and 2-D adenine (2-DAd). Following our recent communication about selective hydrogen loss from the transient negative ions (TNIs) produced in these collisions [T...
April 7, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29622975/ischemia-modified-albumin-ima-in-acute-coronary-syndrome-acs-and-left-bundle-branch-block-lbbb-does-it-make-the-difference
#9
Mohamed Abdel Kader Abdel Wahab
Background: Management of patients with a suspected ACS and LBBB is a challenge to the clinician. Aim: To detect the ability of IMA to exclude myocardial ischemia in suspected patients with ACS and LBBB. Material and methods: A total of 68 patients with suspected ACS and LBBB (group I) and another twenty patients age and sex matched known to have LBBB with normal coronary angiography (group II) were included in this study and subjected to: routine laboratory tests, 12 lead ECG, echocardiography, and measurement of serum troponin I (TnI) and IMA (measured by ELISA)...
September 2017: The Egyptian heart journal: (EHJ): official bulletin of the Egyptian Society of Cardiology
https://www.readbyqxmd.com/read/29563590/successful-outcomes-of-second-hematopoietic-stem-cell-transplantation-with-total-nodal-irradiation-and-atg-conditioning-for-graft-failure-in-adult-patients-with-severe-aplastic-anemia
#10
Seung-Ah Yahng, Sung-Soo Park, Young-Woo Jeon, Jae-Ho Yoon, Seung-Hwan Shin, Sung-Eun Lee, Byung-Sik Cho, Ki-Seong Eom, Yoo-Jin Kim, Seok Lee, Chang-Ki Min, Hee-Je Kim, Seok-Goo Cho, Dong-Wook Kim, Woo-Sung Min, Jong Wook Lee
Data regarding the optimal approach for second allogeneic hematopoietic stem cell transplantation (HSCT) after graft failure (GF) in acquired severe aplastic anemia (SAA) are still limited and heterogeneous. We examined 24 patients who underwent second HLA-matched sibling donor (MSD) peripheral blood HSCT for GF. The reconditioning regimen (TNI-750/ATG) consisted of a single dose of total nodal irradiation (TNI, 750 cGy) and antithymocyte globulin (ATG; Thymoglobulin® , 1.25 mg/kg/day for 3 days). All but one patient achieved successful engraftment of neutrophils (median 12 days, range 5-21) and platelets (median 15 days, range 9-316)...
March 21, 2018: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/29544934/stress-induced-protein-s-glutathionylation-and-phosphorylation-crosstalk-in-cardiac-sarcomeric-proteins-impact-on-heart-function
#11
Nourdine Chakouri, Cyril Reboul, Doria Boulghobra, Adrien Kleindienst, Stéphane Nottin, Sandrine Gayrard, François Roubille, Stefan Matecki, Alain Lacampagne, Olivier Cazorla
BACKGROUND: The interplay between oxidative stress and other signaling pathways in the contractile machinery regulation during cardiac stress and its consequences on cardiac function remains poorly understood. We evaluated the effect of the crosstalk between β-adrenergic and redox signaling on post-translational modifications of sarcomeric regulatory proteins, Myosin Binding Protein-C (MyBP-C) and Troponin I (TnI). METHODS AND RESULTS: We mimicked in vitro high level of physiological cardiac stress by forcing rat hearts to produce high levels of oxidized glutathione...
May 1, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29540327/carvedilol-for-prevention-of-chemotherapy-related-cardiotoxicity-the-ceccy-trial
#12
Mônica Samuel Avila, Silvia Moreira Ayub-Ferreira, Mauro Rogerio de Barros Wanderley, Fatima das Dores Cruz, Sara Michelly Gonçalves Brandão, Vagner Oliveira Carvalho Rigaud, Marília Harumi Higuchi-Dos-Santos, Ludhmila Abrahão Hajjar, Roberto Kalil Filho, Paulo Marcelo Hoff, Marina Sahade, Marcela S M Ferrari, Romulo Leopoldo de Paula Costa, Max Senna Mano, Cecilia Beatriz Bittencourt Viana Cruz, Maria Cristina Abduch, Marco Stephan Lofrano Alves, Guilherme Veiga Guimaraes, Victor Sarli Issa, Marcio Sommer Bittencourt, Edimar Alcides Bocchi
BACKGROUND: Anthracycline (ANT) chemotherapy is associated with cardiotoxicity. Prevention with β-blockers remains controversial. OBJECTIVES: This prospective, randomized, double-blind, placebo-controlled study sought to evaluate the role of carvedilol in preventing ANT cardiotoxicity. METHODS: The authors randomized 200 patients with HER2-negative breast cancer tumor status and normal left ventricular ejection fraction (LVEF) referred for ANT (240 mg/m2 ) to receive carvedilol or placebo until chemotherapy completion...
May 22, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29538525/sensitive-troponin-i-assay-in-patients-with-chest-pain-association-with-significant-coronary-lesions-with-or-without-renal-failure
#13
Alexandre de Matos Soeiro, Danielle Menosi Gualandro, Aline Siqueira Bossa, Cindel Nogueira Zullino, Bruno Biselli, Maria Carolina Feres de Almeida Soeiro, Tatiana de Carvalho Andreucci Torres Leal, Carlos Vicente Serrano, Mucio Tavares de Oliveira Junior
INTRODUCTION: Despite having higher sensitivity as compared to conventional troponins, sensitive troponins have lower specificity, mainly in patients with renal failure. OBJECTIVE: Study aimed at assessing the sensitive troponin I levels in patients with chest pain, and relating them to the existence of significant coronary lesions. METHODS: Retrospective, single-center, observational. This study included 991 patients divided into two groups: with (N = 681) and without (N = 310) significant coronary lesion...
January 2018: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/29533806/ca-2-metabolic-disorder-and-abnormal-expression-of-cardiac-troponin-involved-in-fluoride-induced-cardiomyocyte-damage
#14
Hong-Wei Wang, Jing Liu, Jing Zhao, Lin Lin, Wen-Peng Zhao, Pan-Pan Tan, Wei-Shun Tian, Bian-Hua Zhou
Our previous study indicated that excessive fluoride (F) induces ATP5J and ATP5H proactive expression by interfering cardiomyocyte mitochondrial dysfunction in mice. This study aimed to investigate underlying mechanisms of F¯ induced damage to cardiomyocytes. A total of 100 mg/L F¯ was added to distilled water to treat Kunming mice for 70 days. Pathological and morphological changes in myocardial tissues were observed under transmission electron microscope and light microscope. Content of ATP and ATP enzyme distributed in cardiomyocytes were determined by fluorescence and ATP enzyme staining...
June 2018: Chemosphere
https://www.readbyqxmd.com/read/29526416/comparison-of-magnetic-resonance-analysis-of-myocardial-scarring-with-biomarker-release-following-s-t-elevation-myocardial-infarction
#15
Benedict T Costello, Dion Stub, James Hare, Andris H Ellims, Xinyu Wang, Karen Smith, Stephen Bernard, Ziad Nehme, Michael Stephenson, Janet E Bray, Peter Cameron, Bill Barger, Ian T Meredith, David M Kaye, Leah Iles, Andrew J Taylor
BACKGROUND: Late gadolinium enhancement (LGE) with cardiac magnetic resonance (CMR) is commonly assumed to represent myocardial fibrosis; however, comparative human histological data are limited, and there is no consensus on the most accurate method for LGE quantitation. We evaluated the relationship between CMR assessment of regional fibrosis and infarct size assessment using serial biomarkers after ST elevation acute myocardial infarction (STEMI). METHODS: Ninety-three patients treated for STEMI (59±10 years, 86% male) underwent CMR 6 months after infarction...
February 21, 2018: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29506892/low-level-troponin-elevations-following-a-reduced-troponin-i-cutoff-increased-resource-utilization-without-improved-outcomes
#16
Brent A Becker, Barbara A Stahlman, Nathaniel McLean, Erik I Kochert
OBJECTIVE: The study sought to evaluate changes in mortality and resource utilization in patients with low level troponin elevations following a reduction in the cutoff for normal troponin I (TnI) from 0.5 ng/mL to the 99th percentile (0.06 ng/mL). METHODS: This was an interrupted time series comparing emergency department (ED) patients with possible acute coronary syndrome (ACS) and TnI values 0.06-0.5 ng/mL before and after an institutional decrease in the TnI cutoff...
February 3, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29496193/relative-prognostic-value-of-cardiac-troponin-i-and-c-reactive-protein-in-the-general-population-from-the-nord-tr%C3%A3-ndelag-health-hunt-study
#17
Fjola D Sigurdardottir, Magnus N Lyngbakken, Oddgeir L Holmen, Håvard Dalen, Kristian Hveem, Helge Røsjø, Torbjørn Omland
C-reactive protein and cardiac troponin I measured with high-sensitivity assays (high-sensitivity C-reactive protein [hs-CRP] and high-sensitivity troponin I [hs-TnI]) have been associated with risk of fatal and nonfatal cardiovascular events in the general population. The relative prognostic merits of hs-CRP and hs-TnI, and whether these markers of inflammation and subclinical myocardial injury provide incremental information to established cardiovascular risk prediction models, remain unclear. hs-CRP and hs-TnI were measured in 9,005 participants from the prospective observational Nord-Trøndelag Health (HUNT) study...
April 15, 2018: American Journal of Cardiology
https://www.readbyqxmd.com/read/29495237/-development-and-prospective-validation-of-an-ischemic-risk-score-for-acute-chest-pain-patients-with-normal-high-sensitivity-troponin-i-levels-and-without-obvious-st-segment-deviation
#18
C P Ma, X L Liu, Q S Wang, S P Nie
Objective: To develop and prospectively validate a risk score for acute chest pain patients with normal high-sensitivity troponin I (hs-TnI) levels and without obvious ST-segment deviation in China. Methods: Chest pain patients admitted to the emergency department of Beijing Anzhen Hospital from September 2014 to July 2015 were enrolled. Baseline characteristics of patients met inclusion criteria including normal hs-TnI levels and without obvious ST-segment deviation were included. The endpoint (major adverse cardiovascular events) was a composite of acute myocardial infarction, percutaneous coronary intervention, coronary artery bypass graft, and all-cause death within 3 months after initial presentation...
February 24, 2018: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29459610/admission-troponin-i-and-post-thrombolytic-st-segment-resolution-in-prediction-of-early-risk-stratification-in-st-elevation-myocardial-infarction
#19
S A Islam, M A Bari, M Faruque, T K Bhawmik
The prognostic value of admission troponin I (tnI) levels and the resolution of the ST-segment elevation in ST-elevation myocardial infarction (STEMI) is well established. However, the combination of these two early available markers for predicting the risk of early mortality has not been evaluated yet. This prospective analytical study conducted in the department of Cardiology, Sir Salimullah Medical College and Mitford Hospital, Dhaka and NICVD, Dhaka, Bangladesh from March 2004 to February 2005. We have evaluated 80 patients with streptokinase treated STEMI who had both admission troponin I and ST-monitoring...
January 2018: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29427714/peroxiredoxin-3-attenuates-traumatic-neuronal-injury-through-preservation-of-mitochondrial-function
#20
Wei Hu, Xing-Bo Dang, Gang Wang, Shuai Li, Yue-Lin Zhang
Peroxiredoxins (PRDXs) are a highly conserved family of thiol peroxidases that scavenge peroxides in cells. PRDX3 is one member of PRDXs localized in the mitochondria, and has been shown to be involved in antioxidant defense and redox signaling. In this study, we investigated the role of PRDX3 in neuronal trauma using a traumatic neuronal injury (TNI) model in primary cultured cortical neurons. We found that TNI significantly decreased the expression of PRDX3 at both mRNA and protein levels. Overexpression of PRDX3 by lentivirus (LV-PRDX3) transfection attenuated lactate dehydrogenase (LDH) release and neuronal apoptosis after TNI...
March 2018: Neurochemistry International
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