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Cardiac mechanics

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https://www.readbyqxmd.com/read/28109102/-long-term-outcomes-of-off-pump-coronary-artery-bypass-grafting-in-patients-aged-over-75-years
#1
Yi Guo, Chong-Lei Ren, Chang-Qing Gao, Cang-Song Xiao, Hua-Jun Zhang
OBJECTIVE: To investigate the long-term outcomes of off-pump coronary artery bypass grafting (OPCAB) in patients aged over 75 years and analyze the risk factors affecting the outcomes of the procedure. METHODS: Clinical data were reviewed for 97 consecutive patients aged 75 years or above receiving OPCAB at our center between November, 2000 and November, 2013. The perioperative data including length of ICU stay, duration of mechanical ventilation, incidence of postoperative complications and mortality rate of the patients were analyzed...
January 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28108860/early-cardioversion-in-atrial-fibrillation-earlier-is-better-but-not-always-and-maybe-not-immediately
#2
REVIEW
Paloma G Piña, Alexandru B Chicos
Atrial fibrillation (AF) is the most common cardiac arrhythmia in humans. One of its important features is the tendency to become more persistent over time, even in the absence of underlying progressive heart disease. Conversion and maintenance of sinus rhythm by pharmacological or electrical methods become increasingly difficult the longer the arrhythmia persists. Electrical, mechanical, structural, and autonomic remodeling processes have been implicated in the mechanisms of AF initiation, perpetuation, and progression...
January 2017: Current Atherosclerosis Reports
https://www.readbyqxmd.com/read/28108646/postnatal-resveratrol-supplementation-improves-cardiovascular-function-in-male-and-female-intrauterine-growth-restricted-offspring
#3
Amin Shah, Anita Quon, Jude S Morton, Sandra T Davidge
Intrauterine growth restriction (IUGR) may predispose offspring to an increased susceptibility of developing cardiovascular disease (CVD) in adult life. The window of opportunity to treat later life CVD programmed in fetal life is critical. The aim of this study was to identify the effect of resveratrol treatment of IUGR offspring at a time of known CV dysfunction. Sprague-Dawley male and female rat offspring who experienced normoxia (21% O2; control) or hypoxia (11% O2; IUGR) in utero were fed a high-fat (HF) diet (3-21 weeks of age) or a HF diet (3-21 weeks of age) supplemented with resveratrol from 13 to 21 weeks of age...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28108596/luteolinidin-protects-the-post-ischemic-heart-through-cd38-inhibition-with-preservation-of-nad-p-h
#4
James Boslett, Craig Hemann, Y J Zhao, Hon-Cheung Lee, Jay L Zweier
Recently, we have shown that ischemia and reperfusion (I/R) of the heart causes CD38 activation with resultant depletion of the cardiac NADP(H) pool, most marked in the endothelium. This NADP(H) depletion was shown to limit the production of nitric oxide (NO) by endothelial nitric oxide synthase (eNOS), which requires NADPH for NO production, resulting in greatly altered endothelial function. Therefore, intervention with CD38 inhibitors could reverse post-ischemic eNOS-mediated endothelial dysfunction. We evaluate the potency of the CD38 inhibitor luteolinidin, an anthocyanidin, at blocking CD38 activity and preserving endothelial and myocardial function in the post-ischemic heart...
January 20, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28108421/tlr4-knockout-attenuated-high-fat-diet-induced-cardiac-dysfunction-via-nf-%C3%AE%C2%BAb-jnk-dependent-activation-of-autophagy
#5
Nan Hu, Yingmei Zhang
Obesity is commonly associated with a low grade systematic inflammation, which may contribute to the onset and development of myocardial remodeling and contractile dysfunction. Toll-like receptor 4 (TLR4) plays an important role in innate immunity and inflammation although its role in high fat diet-induced obesity cardiac dysfunction remains elusive. This study was designed to examine the effect of TLR4 ablation on high fat diet intake-induced cardiac anomalies, if any, and underlying mechanism(s) involved...
January 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28108330/pleiotropic-responses-to-methionine-restriction
#6
Gene Ables, Jay Johnson
Methionine restriction (MR) extends lifespan across different species. The main responses of rodent models to MR are well-documented in adipose tissue (AT) and liver, which have reduced mass and improved insulin sensitivity, respectively. Recently, molecular mechanisms that improve healthspan have been identified in both organs during MR. In fat, MR induced a futile lipid cycle concomitant with beige AT accumulation, producing elevated energy expenditure. In liver, MR upregulated fibroblast growth factor 21 and improved glucose metabolism in aged mice and in response to a high-fat diet...
January 17, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28108160/exposure-to-endosulfan-increases-endothelial-permeability-by-transcellular-and-paracellular-pathways-in-relation-to-cardiovascular-diseases
#7
Dan Xu, Tong Liu, Limei Lin, Shuai Li, Xiaoming Hang, Yeqing Sun
Exposure to environmental pollutants results in out-of-balance of vascular homeostasis. Endothelial dysfunction leads to a disruption of the endothelial permeability characteristics, associated with cardiovascular diseases. We previously reported that endosulfan could cause endothelial dysfunction, but the role of endosulfan in permeability of endothelial cells has been unexplored. To elucidate molecular mechanism of endosulfan-induced changes in endothelial permeability, human umbilical vein endothelial cells (HUVECs) were exposed to endosulfan, followed by endothelial permeability analysis...
January 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28108065/assessment-of-central-venous-physiology-of-fontan-circulation-using-peripheral-venous-pressure
#8
Satoshi Masutani, Clara Kurishima, Akiko Yana, Seiko Kuwata, Yoichi Iwamoto, Hirofumi Saiki, Hirotaka Ishido, Hideaki Senzaki
OBJECTIVE: Elevated central venous pressure is a major cause of morbidity and mortality after the Fontan operation. The difference between mean circulatory filling pressure and central venous pressure, a driving force of venous return, is important in determining dynamic changes in central venous pressure in response to changes in ventricular properties or loading conditions. Thus, noninvasive central venous pressure and mean circulatory filling pressure estimation may contribute to optimal management in patients undergoing the Fontan operation...
December 19, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28107665/a-%C3%AF-%C3%AF-conjugation-containing-soft-and-conductive-injectable-polymer-hydrogel-highly-efficiently-rebuilds-cardiac-function-after-myocardial-infarction
#9
Rui Bao, Baoyu Tan, Shuang Liang, Ning Zhang, Wei Wang, Wenguang Liu
Previous studies suggested that a stiffer hydrogel system exhibited a better performance to promote heart function after myocardial infarction (MI). However, the nature of myocardium, a tissue that alternately contracts and relaxes with electrical impulses, leads us to hypothesize that a soft and conductive hydrogel may be in favor of mechanical and electrical signals transmission to enhance heart function after MI. In this work, π-π conjugation interaction was first employed to produce a soft injectable hydrogel with conductive property...
January 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28107664/safety-and-efficacy-of-cardiopoietic-stem-cells-in-the-treatment-of-post-infarction-left-ventricular-dysfunction-from-cardioprotection-to-functional-repair-in-a-translational-pig-infarction-model
#10
Maximilian Y Emmert, Petra Wolint, Andras Jakab, Sean P Sheehy, Francesco S Pasqualini, Thi Dan Linh Nguyen, Monika Hilbe, Burkhardt Seifert, Benedikt Weber, Chad E Brokopp, Dominika Macejovska, Etem Caliskan, Arnold von Eckardstein, Ruth Schwartlander, Viola Vogel, Volkmar Falk, Kevin Kit Parker, Mariann Gyöngyösi, Simon P Hoerstrup
To date, clinical success of cardiac cell-therapies remains limited. To enhance the cardioreparative properties of stem cells, the concept of lineage-specification through cardiopoietic-guidance has been recently suggested. However, so far, only results from murine studies and from a clinical pilot-trial in chronic heart-failure (CHF) are available, while systematic evidence of its therapeutic-efficacy is still lacking. Importantly, also no data from large animals or for other indications are available. Therefore, we here investigate the therapeutic-efficacy of human cardiopoietic stem cells in the treatment of post-infarction LV-dysfunction using a translational pig-model...
November 23, 2016: Biomaterials
https://www.readbyqxmd.com/read/28107271/perioperative-care-of-the-patient-with-the-total-artificial-heart
#11
Jill Yaung, Francisco A Arabia, Michael Nurok
Advanced heart failure continues to be a leading cause of morbidity and mortality despite improvements in pharmacologic therapy. High demand for cardiac transplantation and shortage of donor organs have led to an increase in the utilization of mechanical circulatory support devices. The total artificial heart is an effective biventricular assist device that may be used as a bridge to transplant and that is being studied for destination therapy. This review discusses the history, indications, and perioperative management of the total artificial heart with emphasis on the postoperative concerns...
January 19, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28106485/management-strategies-for-atrial-fibrillation
#12
Peysh A Patel, Noman Ali, Andrew Hogarth, Muzahir H Tayebjee
Atrial fibrillation is the most prevalent cardiac arrhythmia, affecting 10% of those aged over 80 years. Despite multiple treatment options, it remains an independent prognostic marker of mortality due to its association with clinical sequelae, particularly cerebrovascular events. Management can be broadly divided into treatment of the arrhythmia, via rhythm or rate control, and stroke thromboprophylaxis via anticoagulation. Traditional options for pharmacotherapy include negatively chronotropic drugs such as β-blockers, and/or arrhythmia-modifying drugs such as amiodarone...
January 2017: Journal of the Royal Society of Medicine
https://www.readbyqxmd.com/read/28106124/effect-of-myocyte-fibroblast-coupling-on-the-onset-of-pathological-dynamics-in-a-model-of-ventricular-tissue
#13
S Sridhar, Nele Vandersickel, Alexander V Panfilov
Managing lethal cardiac arrhythmias is one of the biggest challenges in modern cardiology, and hence it is very important to understand the factors underlying such arrhythmias. While early afterdepolarizations (EAD) of cardiac cells is known to be one such arrhythmogenic factor, the mechanisms underlying the emergence of tissue level arrhythmias from cellular level EADs is not fully understood. Another known arrhythmogenic condition is fibrosis of cardiac tissue that occurs both due to aging and in many types of heart diseases...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105734/calcium-calmodulin-dependent-protein-kinase-mediates-the-intracellular-signaling-pathways-of-cardiac-apoptosis-in-mice-with-impaired-glucose-tolerance
#14
Marilen Federico, Enrique L Portiansky, Leandro Sommese, Francisco J Alvarado, Paula G Blanco, Carolina N Zanuzzi, John Dedman, Marcia Kaetzel, Xander H T Wehrens, Alicia Mattiazzi, Julieta Palomeque
Background The impact of cardiac apoptosis in pre-diabetic stages of diabetic cardiomyopathy is unknown. We described that myocytes from fructose-rich diet (FRD) animals exhibit arrhythmias produced by exacerbated Ca(2+) /calmodulin-protein kinase (CaMKII) activity, ryanodine receptors (RyR2) phosphorylation and sarcoplasmic reticulum (SR) Ca(2+) leak. We tested the hypothesis that this mechanism also underlies cardiac apoptosis in pre-diabetes. Methods and Results We generated a pre-diabetic model in mice fed with FRD...
January 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28105408/predictors-of-prolonged-mechanical-ventilation-in-pediatric-patients-after-cardiac-surgery-for-congenital-heart-disease
#15
Avisa Tabib, Seyed Ehsan Abrishami, Mohammad Mahdavi, Hojjat Mortezaeian, Ziae Totonchi
BACKGROUND: The duration of mechanical ventilation (MV) is one of the most important clinical factors which predict outcomes in pediatric cardiac surgery. The prolonged mechanical ventilation (PMV) following cardiac surgery is a multifactorial phenomenon and there are conflicts regarding its predictors in pediatric population between different centers. OBJECTIVES: The current study aimed to describe PMV predictors in patients undergoing cardiac surgery for congenital heart disease in a tertiary center for pediatric cardiovascular diseases in Iran...
August 2016: Research in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28105120/effects-of-curcumin-on-the-apoptosis-of-cardiomyocytes-and-the-expression-of-nf-%C3%AE%C2%BAb-ppar-%C3%AE-and-bcl-2-in-rats-with-myocardial-infarction-injury
#16
Feng-Hua Lv, Hong-Lei Yin, Yi-Qun He, Hui-Min Wu, Juan Kong, Xiao-Yan Chai, Su-Rong Zhang
Curcumin is a natural polyphenol with powerful antioxidant and anti-inflammatory properties. The present study evaluated the protective effect of curcumin on myocardial injury in rats as well as the mechanisms underlying these effects, and examined the expression of nuclear factor-κB (NF-κB), peroxisome proliferator-activated receptor-γ (PPAR-γ) and B-cell leukemia/lymphoma-2 (Bcl-2) following myocardial infarction. A rat model of myocardial infarction was successfully established. Hematoxylin and eosin staining showed cellular atrophy and hyperchromatic cytoplasm in the myocardial infarction area...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28104773/exosomes-generated-from-ipsc-derivatives-new-direction-for-stem-cell-therapy-in-human-heart-diseases
#17
REVIEW
Ji-Hye Jung, Xuebin Fu, Phillip C Yang
Cardiovascular disease (CVD) is the leading cause of death in modern society. The adult heart innately lacks the capacity to repair and regenerate the damaged myocardium from ischemic injury. Limited understanding of cardiac tissue repair process hampers the development of effective therapeutic solutions to treat CVD such as ischemic cardiomyopathy. In recent years, rapid emergence of induced pluripotent stem cells (iPSC) and iPSC-derived cardiomyocytes presents a valuable opportunity to replenish the functional cells to the heart...
January 20, 2017: Circulation Research
https://www.readbyqxmd.com/read/28104764/long-noncoding-rnas-in-pathological-cardiac-remodeling
#18
Janika Viereck, Thomas Thum
A novel long noncoding RNA Chaer acts as noncoding epigenetic regulator at the onset of cardiac hypertrophy and enables an improved understanding about the complex mechanisms in cardiovascular disease.
January 20, 2017: Circulation Research
https://www.readbyqxmd.com/read/28104714/long-term-biased-%C3%AE-arrestin-signaling-improves-cardiac-structure-and-function-in-dilated-cardiomyopathy
#19
David M Ryba, Jieli Li, Conrad L Cowan, Brenda Russell, Beata M Wolska, R John Solaro
BACKGROUND: -Biased agonism of the angiotensin receptor (AT1R) is known to promote cardiac contractility. Our laboratory indicated that these effects may be due to changes at the level of the myofilaments. However, these signaling mechanisms remain unknown. As a common finding in dilated cardiomyopathy (DCM) is a reduction in the myofilament-Ca(2+)-response, we hypothesized that β-arrestin signaling would increase myofilament-Ca(2+)-responsiveness in a model of familial DCM and improve cardiac function and morphology...
January 19, 2017: Circulation
https://www.readbyqxmd.com/read/28104567/cardiovascular-toxicity-of-angiogenesis-inhibitors-in-treatment-of-malignancy-a-systematic-review-and-meta-analysis
#20
REVIEW
Husam Abdel-Qadir, Josee-Lyne Ethier, Douglas S Lee, Paaladinesh Thavendiranathan, Eitan Amir
BACKGROUND: The cardiovascular risk of angiogenesis inhibitors is not well-quantified. We hypothesized that, compared to direct vascular endothelial growth factor (VEGF) inhibitors (anti-VEGF antibodies or decoy receptors), small molecule agents have higher risk due to their less specific mechanism. METHODS: We searched the MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials for phase III randomised controlled trials comparing angiogenesis inhibitor-based therapy to other systemic therapy...
December 30, 2016: Cancer Treatment Reviews
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