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Ventricular structure-function relation

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https://www.readbyqxmd.com/read/28516454/a-multiscale-computational-modelling-approach-predicts-mechanisms-of-female-sex-risk-in-the-setting-of-arousal-induced-arrhythmias
#1
Pei-Chi Yang, Laura L Perissinotti, Fernando López-Redondo, Yibo Wang, Kevin R DeMarco, Mao-Tsuen Jeng, Igor Vorobyov, Robert D Harvey, Junko Kurokawa, Sergei Y Noskov, Colleen E Clancy
Female sex is a risk factor for inherited and acquired Long-QT associated Torsade de Pointes (TdP) arrhythmias, and sympathetic discharge is a major factor in triggering TdP in female Long-QT syndrome patients. We used a combined experimental and computational approach to predict 'the perfect storm' of hormone concentration, IKr block, and sympathetic stimulation that induces arrhythmia in females with inherited and acquired Long-QT. More specifically, we developed mathematical models of acquired and inherited Long-QT syndrome in male and female ventricular human myocytes by combining effects of a hormone and a hERG blocker dofetilide or hERG mutations...
May 18, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28515695/chronic-endurance-exercise-impairs-cardiac-structure-and-function-in-middle-aged-mice-with-impaired-nrf2-signaling
#2
Gobinath Shanmugam, Madhusudhanan Narasimhan, Robbie L Conley, Thiagarajan Sairam, Ashutosh Kumar, Ronald P Mason, Ramalingam Sankaran, John R Hoidal, Namakkal S Rajasekaran
Nuclear factor erythroid 2 related factor 2 (Nrf2) signaling maintains the redox homeostasis and its activation is shown to suppress cardiac maladaptation. Earlier we reported that acute endurance exercise (2 days) evoked antioxidant cytoprotection in young WT animals but not in aged WT animals. However, the effect of repeated endurance exercise during biologic aging (WT) characterized by an inherent deterioration in Nrf2 signaling and pathological aging (pronounced oxidative susceptibility-Nrf2 absence) in the myocardium remains elusive...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28502095/the-impact-of-age-and-frailty-on-ventricular-structure-and-function-in-c57bl-6j-mice
#3
H A Feridooni, A E Kane, O Ayaz, A Boroumandi, N Polidovitch, R G Tsushima, R A Rose, S E Howlett
KEY POINTS: Heart size increases with age (called hypertrophy), and its ability to contract declines. However, these reflect average changes that may not be present, or present to the same extent, in all older individuals. That aging happens at different rates is well accepted clinically. People who are aging rapidly are frail and frailty is measured with a 'frailty index'. We quantified frailty with a validated mouse frailty index tool and evaluated the impacts of age and frailty on cardiac hypertrophy and contractile dysfunction...
May 14, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28493996/left-ventricular-functional-structural-and-energetic-effects-of-normal-aging-comparison-with-hypertension
#4
Jehill D Parikh, Kieren G Hollingsworth, Dorothy Wallace, Andrew M Blamire, Guy A MacGowan
OBJECTIVES: Both aging and hypertension are significant risk factors for heart failure in the elderly. The purpose of this study was to determine how aging, with and without hypertension, affects left ventricular function. METHODS: Cross-sectional study of magnetic resonance imaging and 31P spectroscopy-based measurements of left ventricular structure, global function, strains, pulse wave velocity, high energy phosphate metabolism in 48 normal subjects and 40 treated hypertensive patients (though no other cardiovascular disease or diabetes) stratified into 3 age deciles from 50-79 years...
2017: PloS One
https://www.readbyqxmd.com/read/28489502/advances-in-cardiac-pacing-and-defibrillation
#5
Kristin Ellison, Parikshit S Sharma, Richard Trohman
There have been many milestones in the evolution of cardiac implantable electronic devices (CIEDs) over the past few decades. Along with advancements in the field, new challenges have arisen. The ability to pace the right ventricular was the original breakthrough in the late 1950s, however adverse structural and clinical effects of long-term pacing induced dyssynchrony have recently become evident. Biventricular pacing has provided a viable option to help mitigate dyssynchrony, but has only proved to be beneficial for selective patients (primarily left bundle branch block and QRS duration ≥ 150 ms with depressed left ventricular (LV) function)...
May 10, 2017: Expert Review of Cardiovascular Therapy
https://www.readbyqxmd.com/read/28473471/are-targeted-therapies-for-diabetic-cardiomyopathy-on-the-horizon
#6
REVIEW
Mitchel Tate, David J Grieve, Rebecca H Ritchie
Diabetes increases the risk of heart failure approximately 2.5-fold, independent of coronary artery disease and other comorbidities. This process, termed diabetic cardiomyopathy, is characterized by initial impairment of left ventricular (LV) relaxation followed by LV contractile dysfunction. Post-mortem examination reveals that human diastolic dysfunction is closely associated with LV damage, including cardiomyocyte hypertrophy, apoptosis and fibrosis, with impaired coronary microvascular perfusion. The pathophysiological mechanisms underpinning the characteristic features of diabetic cardiomyopathy remain poorly understood, although multiple factors including altered lipid metabolism, mitochondrial dysfunction, oxidative stress, endoplasmic reticulum (ER) stress, inflammation, as well as epigenetic changes, are implicated...
May 1, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28463644/reduced-sympathetic-stimulus-and-angiotensin-1-7-are-related-to-diastolic-dysfunction-in-spinal-cord-injured-subjects
#7
Roberto Schreiber, Layde R Paim, Guilherme de Rossi, José R Matos-Souza, Anselmo Costa E Silva, Cláudio D Nogueira, Eliza R Azevedo, Karina C Alonso, Zaira Palomino, Andrei C Sposito, Dulce E Casarini, José I Gorla, Alberto Cliquet, Wilson Nadruz
Chronic spinal cord injury (SCI) is often associated with reductions in left ventricular (LV) diastolic function. Impairments in sympathetic activity and activation of the renin-angiotensin system are reported in SCI individuals and may hypothetically be implicated in this association. Hence, the present study verified the relationship between these two neuro-hormonal and cardiac functional and structural characteristics in SCI individuals. Twenty-two men with SCI (injury level above T6 and no voluntary motion below the injury) and 11 able-bodied men were evaluated by clinical, hemodynamic, laboratory and echocardiographic analysis, and had plasmatic renin, angiotensin I (ANGI), angiotensin II (ANGII), angiotensin 1-7 (ANG1-7) and noradrenaline levels measured...
May 2, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28459993/the-association-between-alcohol-consumption-and-left-ventricular-diastolic-function-and-geometry-change-in-general-korean-population
#8
Sung Keun Park, Kanghee Moon, Jae-Hong Ryoo, Chang-Mo Oh, Joong-Myung Choi, Jeong Gyu Kang, Ju Youn Chung, Ju Young Jung
Aims: The adverse effect of heavy alcohol intake on cardiovascular disease is well established. However, there is only limited information about the risk of subclinical left ventricular (LV) abnormality according to alcohol consumption. Thus, this study was to investigate the association between alcohol consumption and LV functional and structural abnormality. Methods and results: Study participants were 49 714 Korean adults received echocardiogram as an item of health check-up program...
April 27, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28438659/the-nrf2-activator-dh404-attenuates-adverse-ventricular-remodeling-post-myocardial-infarction-by-modifying-redox-signalling
#9
Kristen J Bubb, Cindy Kok, Owen Tang, Nathalie B Rasko, Asa B Birgisdottir, Thomas Hansen, Rebecca Ritchie, Ravinay Bhindi, Scott A Reisman, Colin Meyer, Keith Ward, Keyvan Karimi Galougahi, Gemma A Figtree
BACKGROUND: The novel synthetic triterpenoid, bardoxolone methyl, has the ability to upregulate cytoprotective proteins via induction of the nuclear factor erythroid-2-related factor 2 (Nrf2) pathway. This makes it a promising therapeutic agent in disease states characterized by dysregulated oxidative signalling. We have examined the effect of a Nrf2 activator, dihydro-CDDO-trifluoroethyl amide (DH404), a derivative of bardoxolone methyl, on post-infarct cardiac remodeling in rats. METHODS/RESULTS: DH404, administered from day 2 post myocardial infarction (MI: 30min transient ischemia followed by reperfusion) resulted in almost complete protection against adverse ventricular remodeling as assessed at day 28 (left ventricular end-systolic area: sham 0...
April 21, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28436119/maternal-hypertrophy-and-diastolic-disfunction-and-brain-natriuretic-peptide-concentration-in-early-and-late-pre-eclampsia
#10
V T M Borges, S G Zanati, M T S PeraÇoli, J R Poiati, M Romão-Veiga, J C PeraÇoli, B Thilaganathan
OBJECTIVE: Pre-eclampsia is associated with maternal cardiac remodelling and diastolic dysfunction. The aim of this study was to assess and compare maternal left ventricular structure and diastolic function and Brain Natriuretic Peptide (BNP) levels in women with early-onset pre-eclampsia (<34 weeks of gestation) and late-onset pre-eclampsia (≥34weeks of gestation). METHODS: A prospective, cross-sectional observational study was performed in 30 women with early-onset pre-eclampsia, 32 with late-onset pre-eclampsia and 23 normotensive controls...
April 23, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28419371/sleep-a-window-into-autonomic-control-in-children-born-preterm-and-growth-restricted
#11
Stephanie R Yiallourou, Euan M Wallace, Christie Whatley, Alexsandria Odoi, Samantha Hollis, Aidan J Weichard, Jayan Shivanandhan Muthusamy, Suraj Varma, James Cameron, Om Narayan, Rosemary S C Horne
Study Objectives: Preterm birth and fetal growth restriction (FGR) are both associated with risk of hypertension in adulthood. Mechanisms leading to this pathology are unclear. In children aged 5-12 years, who were born preterm and FGR, we used sleep as a tool to assess autonomic control with assessment of cardiovascular structure and function. Methods: Eighteen children born preterm and FGR, 15 children born preterm with appropriate birth weights for gestational age (AGA), and 20 AGA term-born children were studied...
May 1, 2017: Sleep
https://www.readbyqxmd.com/read/28418458/right-ventricular-fiber-structure-as-a-compensatory-mechanism-in-experimental-pressure-overload-a-computational-study
#12
Arnold D Gomez, Huashan Zou, Megan E Bowen, Xiaoqing Liu, Edward W Hsu, Stephen H McKellar
Right ventricular failure (RVF) is a lethal condition in diverse pathologies. Pressure overload is the most common etiology of RVF, but our understanding of the tissue structure remodeling and other biomechanical factors involved in RVF is limited. Some remodeling patterns are interpreted as compensatory mechanisms including myocyte hypertrophy, extracellular fibrosis, and changes in fiber orientation. However, the specific implications of these changes, especially in relation to clinically observable measurements, are difficult to investigate experimentally...
April 17, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28416588/association-between-mutation-status-and-left-ventricular-reverse-remodelling-in-dilated-cardiomyopathy
#13
Matteo Dal Ferro, Davide Stolfo, Alessandro Altinier, Marta Gigli, Martina Perrieri, Federica Ramani, Giulia Barbati, Alberto Pivetta, Francesca Brun, Lorenzo Monserrat, Mauro Giacca, Luisa Mestroni, Marco Merlo, Gianfranco Sinagra
OBJECTIVE: To explore the genetic landscape of a well selected dilated cardiomyopathy (DCM) cohort, assessing the possible relation between different genotypes and left ventricular reverse remodelling (LVRR). METHODS: A cohort of 152 patients with DCM from the Heart Muscle Disease Registry of Trieste has been studied by next-generation sequencing (NGS). Patients were grouped into different 'gene-clusters' with functionally homogeneous genetic backgrounds. LVRR was defined by left ventricular ejection fraction normalisation or increase ≥10% associated with normalisation in indexed left ventricular end-diastolic diameter or relative decrease ≥10% at 24 months follow-up...
April 17, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28394258/large-scale-genome-wide-analysis-identifies-genetic-variants-associated-with-cardiac-structure-and-function
#14
Philipp S Wild, Janine F Felix, Arne Schillert, Alexander Teumer, Ming-Huei Chen, Maarten J G Leening, Uwe Völker, Vera Großmann, Jennifer A Brody, Marguerite R Irvin, Sanjiv J Shah, Setia Pramana, Wolfgang Lieb, Reinhold Schmidt, Alice V Stanton, Dörthe Malzahn, Albert Vernon Smith, Johan Sundström, Cosetta Minelli, Daniela Ruggiero, Leo-Pekka Lyytikäinen, Daniel Tiller, J Gustav Smith, Claire Monnereau, Marco R Di Tullio, Solomon K Musani, Alanna C Morrison, Tune H Pers, Michael Morley, Marcus E Kleber, Jayashri Aragam, Emelia J Benjamin, Joshua C Bis, Egbert Bisping, Ulrich Broeckel, Susan Cheng, Jaap W Deckers, Fabiola Del Greco M, Frank Edelmann, Myriam Fornage, Lude Franke, Nele Friedrich, Tamara B Harris, Edith Hofer, Albert Hofman, Jie Huang, Alun D Hughes, Mika Kähönen, Knhi Investigators, Jochen Kruppa, Karl J Lackner, Lars Lannfelt, Rafael Laskowski, Lenore J Launer, Margrét Leosdottir, Honghuang Lin, Cecilia M Lindgren, Christina Loley, Calum A MacRae, Deborah Mascalzoni, Jamil Mayet, Daniel Medenwald, Andrew P Morris, Christian Müller, Martina Müller-Nurasyid, Stefania Nappo, Peter M Nilsson, Sebastian Nuding, Teresa Nutile, Annette Peters, Arne Pfeufer, Diana Pietzner, Peter P Pramstaller, Olli T Raitakari, Kenneth M Rice, Fernando Rivadeneira, Jerome I Rotter, Saku T Ruohonen, Ralph L Sacco, Tandaw E Samdarshi, Helena Schmidt, Andrew S P Sharp, Denis C Shields, Rossella Sorice, Nona Sotoodehnia, Bruno H Stricker, Praveen Surendran, Simon Thom, Anna M Töglhofer, André G Uitterlinden, Rolf Wachter, Henry Völzke, Andreas Ziegler, Thomas Münzel, Winfried März, Thomas P Cappola, Joel N Hirschhorn, Gary F Mitchell, Nicholas L Smith, Ervin R Fox, Nicole D Dueker, Vincent W V Jaddoe, Olle Melander, Martin Russ, Terho Lehtimäki, Marina Ciullo, Andrew A Hicks, Lars Lind, Vilmundur Gudnason, Burkert Pieske, Anthony J Barron, Robert Zweiker, Heribert Schunkert, Erik Ingelsson, Kiang Liu, Donna K Arnett, Bruce M Psaty, Stefan Blankenberg, Martin G Larson, Stephan B Felix, Oscar H Franco, Tanja Zeller, Ramachandran S Vasan, Marcus Dörr
BACKGROUND: Understanding the genetic architecture of cardiac structure and function may help to prevent and treat heart disease. This investigation sought to identify common genetic variations associated with inter-individual variability in cardiac structure and function. METHODS: A GWAS meta-analysis of echocardiographic traits was performed, including 46,533 individuals from 30 studies (EchoGen consortium). The analysis included 16 traits of left ventricular (LV) structure, and systolic and diastolic function...
May 1, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28381470/evidence-supporting-the-existence-of-a-distinct-obese-phenotype-of-heart-failure-with-preserved-ejection-fraction
#15
Masaru Obokata, Yogesh N V Reddy, Sorin V Pislaru, Vojtech Melenovsky, Barry A Borlaug
Background -Heart failure (HF) with preserved ejection fraction (HFpEF) is a heterogeneous syndrome. Phenotyping patients into pathophysiologically homogenous groups may enable better targeting of treatment. Obesity is common in HFpEF and has many cardiovascular effects, suggesting it may be a viable candidate for phenotyping. We compared cardiovascular structure, function, and reserve capacity in subjects with obese HFpEF, non-obese HFpEF, and controls. Methods -Subjects with obese HFpEF (BMI≥35kg/m(2), n=99), non-obese HFpEF (BMI<30kg/m(2), n=96), and non-obese controls free of HF (n=71) underwent detailed clinical assessment, echocardiography and invasive hemodynamic exercise testing...
April 5, 2017: Circulation
https://www.readbyqxmd.com/read/28381447/acute-cardiac-functional-and-mechanical-responses-to-isometric-exercise-in-prehypertensive-males
#16
Jamie M O'Driscoll, Katrina A Taylor, Jonathan D Wiles, Damian A Coleman, Rajan Sharma
Isometric exercise (IE) training has been shown to reduce resting arterial blood pressure (ABP) in hypertensive, prehypertensive, and normotensive populations. However, the acute hemodynamic response of the heart to such exercise remains unclear. We therefore performed a comprehensive assessment of cardiac structure, function, and mechanics at rest and immediately post a single IE session in 26 male (age 44.8 ± 8.4 years) prehypertensive participants. Conventional echocardiography recorded standard and tissue Doppler measures of left ventricular (LV) structure and function...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28379176/ostreolysin-a-pleurotolysin-b-and-equinatoxins-structure-function-and-pathophysiological-effects-of-these-pore-forming-proteins
#17
REVIEW
Robert Frangež, Dušan Šuput, Jordi Molgó, Evelyne Benoit
Acidic ostreolysin A/pleurotolysin B (OlyA/PlyB, formerly known as ostreolysin (Oly), and basic 20 kDa equinatoxins (EqTs) are cytolytic proteins isolated from the edible mushroom Pleurotus ostreatus and the sea anemone Actinia equina, respectively. Both toxins, although from different sources, share many similar biological activities: (i) colloid-osmotic shock by forming pores in cellular and artificial membranes enriched in cholesterol and sphingomyelin; (ii) increased vascular endothelial wall permeability in vivo and perivascular oedema; (iii) dose-dependent contraction of coronary vessels; (iv) haemolysis with pronounced hyperkalaemia in vivo; (v) bradycardia, myocardial ischemia and ventricular extrasystoles accompanied by progressive fall of arterial blood pressure and respiratory arrest in rodents...
April 5, 2017: Toxins
https://www.readbyqxmd.com/read/28371898/longitudinal-association-of-short-term-metronome-paced-heart-rate-variability-and-echocardiographically-assessed-cardiac-structure-at-a-4-year-follow-up-results-from-the-prospective-population-based-carla-cohort
#18
Daniel Medenwald, Cees A Swenne, Stefan Frantz, Sebastian Nuding, Jan A Kors, Diana Pietzner, Daniel Tiller, Karin H Greiser, Alexander Kluttig, Johannes Haerting
Aims: To assess the value of cardiac structure/function in predicting heart rate variability (HRV) and the possibly predictive value of HRV on cardiac parameters. Methods and results: Baseline and 4-year follow-up data from the population-based CARLA cohort were used (790 men, 646 women, aged 45-83 years at baseline and 50-87 years at follow-up). Echocardiographic and HRV recordings were performed at baseline and at follow-up. Linear regression models with a quadratic term were used...
March 23, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28365405/novel-insights-into-cardiac-remodelling-revealed-by-proteomic-analysis-of-the-trout-heart-during-exercise-training
#19
Laura A Dindia, Sarah L Alderman, Todd E Gillis
The changes in the cardiac proteome of rainbow trout (Oncorhynchus mykiss) were quantified during the early phases (4, 7, and 14d) of a typical exercise-training regime to provide a comprehensive overview of the cellular changes responsible for developing a trained heart phenotype. Enhanced somatic growth during the 14d experiment was paralleled by cardiac growth to maintain relative ventricular mass. This was reflected in the cardiac proteome by the increased abundance of contractile proteins and cellular integrity proteins as early as Day 4, including a pronounced and sustained increase in blood vessel epicardial substance - an intercellular adhesion protein expressed in the vertebrate heart...
March 29, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28364177/magnetic-resonance-imaging-for-characterizing-myocardial-diseases
#20
REVIEW
Maythem Saeed, Hui Liu, Chang-Hong Liang, Mark W Wilson
The National Institute of Health defined cardiomyopathy as diseases of the heart muscle. These myocardial diseases have different etiology, structure and treatment. This review highlights the key imaging features of different myocardial diseases. It provides information on myocardial structure/orientation, perfusion, function and viability in diseases related to cardiomyopathy. The standard cardiac magnetic resonance imaging (MRI) sequences can reveal insight on left ventricular (LV) mass, volumes and regional contractile function in all types of cardiomyopathy diseases...
March 31, 2017: International Journal of Cardiovascular Imaging
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