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https://www.readbyqxmd.com/read/28445457/the-mitochondrial-na-ca-2-exchanger-is-essential-for-ca-2-homeostasis-and-viability
#1
Timothy S Luongo, Jonathan P Lambert, Polina Gross, Mary Nwokedi, Alyssa A Lombardi, Santhanam Shanmughapriya, April C Carpenter, Devin Kolmetzky, Erhe Gao, Jop H van Berlo, Emily J Tsai, Jeffery D Molkentin, Xiongwen Chen, Muniswamy Madesh, Steven R Houser, John W Elrod
Mitochondrial calcium (mCa(2+)) has a central role in both metabolic regulation and cell death signalling, however its role in homeostatic function and disease is controversial. Slc8b1 encodes the mitochondrial Na(+)/Ca(2+) exchanger (NCLX), which is proposed to be the primary mechanism for mCa(2+) extrusion in excitable cells. Here we show that tamoxifen-induced deletion of Slc8b1 in adult mouse hearts causes sudden death, with less than 13% of affected mice surviving after 14 days. Lethality correlated with severe myocardial dysfunction and fulminant heart failure...
April 26, 2017: Nature
https://www.readbyqxmd.com/read/28434143/the-mtor-signaling-pathway-in-myocardial-dysfunction-in-type-2-diabetes-mellitus
#2
REVIEW
Tomohiro Suhara, Yuichi Baba, Briana K Shimada, Jason K Higa, Takashi Matsui
PURPOSE OF REVIEW: T2DM (type 2 diabetes mellitus) is a risk factor for heart failure. The mTOR (mechanistic target of rapamycin) is a key mediator of the insulin signaling pathway. We will discuss the role of mTOR in myocardial dysfunction in T2DM. RECENT FINDINGS: In T2DM, chronically activated mTOR induces multiple pathological events, including a negative feedback loop that suppresses IRS (insulin receptor substrate)-1. While short-term treatment with rapamycin, an mTOR inhibitor, is a promising strategy for cardiac diseases such as acute myocardial infarction and cardiac hypertrophy in T2DM, there are many concerns about chronic usage of rapamycin...
June 2017: Current Diabetes Reports
https://www.readbyqxmd.com/read/28433665/advancing-the-science-of-myocardial-recovery-with-mechanical-circulatory-support-a-working-group-of-the-national-heart-lung-and-blood-institute
#3
Stavros G Drakos, Francis D Pagani, Martha S Lundberg, J Timothy Baldwin
The medical burden of heart failure (HF) has spurred interest in clinicians and scientists to develop therapies to restore the function of a failing heart. To advance this agenda, the National Heart Lung Blood Institute (NHLBI) convened a Working Group of experts on June 2-3, 2016 in Bethesda Maryland to develop recommendations for the NHLBI aimed at advancing the science of cardiac recovery in the setting of mechanical circulatory support (MCS). MSC devices effectively reduce volume and pressure overload that drives the cycle of progressive myocardial dysfunction, thereby triggering structural and functional reverse remodeling...
April 19, 2017: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/28432604/phosphate-imbalance-in-patients-with-heart-failure
#4
REVIEW
E C Christopoulou, T D Filippatos, E Megapanou, M S Elisaf, G Liamis
Patients with heart failure often exhibit electrolyte abnormalities, such as hyponatremia or hypokalemia/hyperkalemia. Although not as common as the other electrolyte disturbances observed in patients with heart failure, phosphate imbalance is also of high importance in this population. The aim of this review is to present the mechanisms of low or high phosphate serum levels in patients with heart failure and its role in the pathogenesis and progression of heart dysfunction. Hypophosphatemia in patients with heart failure may be the result of co-existing electrolyte and acid-base abnormalities, pharmacological treatments, decreased intestinal absorption or secondary to sympathetic nervous system activation and co-morbidities, such as diabetes mellitus or heavy alcohol consumption...
April 22, 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/28432312/growth-differentiation-factor-15-deficiency-augments-inflammatory-response-and-exacerbates-septic-heart-and-renal-injury-induced-by-lipopolysaccharide
#5
Palida Abulizi, Neruja Loganathan, Duo Zhao, Tina Mele, Yixin Zhang, Terry Zwiep, Kexiang Liu, Xiufen Zheng
Septic acute kidney injury (AKI) and myocardial dysfunction are leading causes of mortality with no accepted method of therapy. In this study we demonstrate the role of growth differentiating factor 15 (GDF15) in septic AKI and myocardial dysfunction using a murine lipopolysaccharide (LPS)-induced sepsis model and an in vitro cell culture system. Data show that GDF15 deficiency augments inflammatory response and exacerbates renal and cardiac injury induced by LPS, while over-expression of GDF15 protects the kidney and heart from LPS-induced organ dysfunction...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28427050/expression-of-high-mobility-group-protein-b1-in-cardiac-tissue-of-elderly-patients-with-coronary-artery-disease-with-or-without-inflammatory-rheumatic-disease
#6
Mei Bruton, Ivana Hollan, Julie Xiao, Eva Lindroos, Knut Mikkelsen, Stein E Rynning, Kjell Saatvedt, Sven M Almdahl, Helena E Harris, Ingrid E Lundberg, Cecilia Wick
BACKGROUND: It is known from clinical practice and observational studies that elderly patients with a diagnosis of inflammatory rheumatic diseases (IRD) bear a significantly increased risk for cardiovascular diseases such as coronary artery disease (CAD) and heart failure. The molecular mechanism, however, is still not known. Recently, high mobility group protein B1 (HMGB1), a ubiquitous, highly conserved single polypeptide expressed in all mammal eukaryotic cells, has been identified to mediate myocardial dysfunction in vitro once released from the nuclei of cardiomyocytes...
April 21, 2017: Gerontology
https://www.readbyqxmd.com/read/28408782/assessment-of-regional-left-ventricular-systolic-function-by-strain-imaging-echocardiography-in-phenotypically-normal-and-abnormal-maine-coon-cats-tested-for-the-a31p-mutation-in-the-mybpc3-gene
#7
Arine Pellegrino, Alexandre G T Daniel, Guilherme G Pereira, Paula H Itikawa, Maria Helena M A Larsson
Myocardial dysfunction occurs in cats with hypertrophic cardiomyopathy (HCM), but little is known about the early stages of the disease. Strain imaging echocardiography is a method that enables the quantitative assessment of myocardial function and deformity, allowing the characterization of systolic dysfunction. The objective of this study was to assess systolic function using strain imaging echocardiography in Maine coon cats genetically tested for the A31P mutation in the MYBPC3 gene, with and without ventricular hypertrophy...
April 2017: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
https://www.readbyqxmd.com/read/28407402/cirrhotic-cardiomyopathy-implications-for-liver-transplantation
#8
REVIEW
Hongqun Liu, Saumya Jayakumar, Mouhieddin Traboulsi, Samuel S Lee
The majority of the patients on a waiting list for liver transplantation have end-stage liver disease. Due to the marked peripheral vasodilatation of end stage cirrhosis that masks a latent myocardial dysfunction, cardiac abnormalities in the resting state are usually subclinical and escape the attention of physicians. However, when challenged, the systolic and diastolic contractile responses are attenuated. In addition to these contractile abnormalities, morphological changes such as enlargement or hypertrophy of cardiac chambers and electrophysiological repolarization changes including a prolonged QT interval can be observed...
April 13, 2017: Liver Transplantation
https://www.readbyqxmd.com/read/28406991/a-mathematical-model-for-active-contraction-in-healthy-and-failing-myocytes-and-left-ventricles
#9
Li Cai, Yongheng Wang, Hao Gao, Yiqiang Li, Xiaoyu Luo
Cardiovascular disease is one of the leading causes of death worldwide, in particular myocardial dysfunction, which may lead to heart failure eventually. Understanding the electro-mechanics of the heart will help in developing more effective clinical treatments. In this paper, we present a multi-scale electro-mechanics model of the left ventricle (LV). The Holzapfel-Ogden constitutive law was used to describe the passive myocardial response in tissue level, a modified Grandi-Pasqualini-Bers model was adopted to model calcium dynamics in individual myocytes, and the active tension was described using the Niederer-Hunter-Smith myofilament model...
2017: PloS One
https://www.readbyqxmd.com/read/28400292/is-takotsubo-syndrome-a-benign-condition
#10
EDITORIAL
Maria I Drakopoulou, Michael A Gatzoulis
Takotsubo syndrome has emerged as a unique form of acute myocardial injury associated with chest pain or dyspnea, new ST-T segment abnormalities, serum cardiac enzyme release, distinctive transient regional myocardial dysfunction and absence of significant coronary disease at coronary angiography. The initial diagnosis of Takotsubo syndrome at the emergency room is challenging and although its clinical manifestations usually spontaneously resolve over time, it is not always a disease with benign course. Future prospective studies may be helpful to explore the clinical features and prognostic markers for the outcome of patients diagnosed with Takotsubo syndrome...
April 8, 2017: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/28399703/value-of-speckle-tracking-echocardiography-for-detection-of-clinically-silent-left-ventricular-dysfunction-in-patients-with-%C3%AE-thalassemia
#11
Mozhgan Parsaee, Sedigheh Saedi, Pegah Joghataei, Azita Azarkeivan, Zahra Alizadeh Sani
OBJECTIVE: β-Thalassemia is an inherited hemoglobin disorder resulting in chronic hemolytic anemia requiring chronic transfusion therapy. Cardiac involvement is the main cause of death in patients with thalassemia major. The narrow border is between overt myocardial dysfunction and clinically silent left ventricular (LV) dysfunction in patients with thalassemia. Therefore, we need novel parameters in different imaging techniques to discover cardiac involvement in an early and subtle stage...
April 12, 2017: Hematology (Amsterdam, Netherlands)
https://www.readbyqxmd.com/read/28398124/from-molecular-mechanisms-to-clinical-management-of-antineoplastic-drug-induced-cardiovascular-toxicity-a-translational-overview
#12
Carlo Gabriele Tocchetti, Christian Cadeddu, Daniela Di Lisi, Saveria Femminò, Rosalinda Madonna, Donato Mele, Ines Monte, Giuseppina Novo, Claudia Penna, Alessia Pepe, Paolo Spallarossa, Gilda Varricchi, Concetta Zito, Pasquale Pagliaro, Giuseppe Mercuro
SIGNIFICANCE: Antineoplastic therapies have improved the prognosis of oncology patients sig-nificantly. However, these treatments can bring to a higher incidence of side effects, including the worrying cardiovascular toxicity (CTX). Recent Advances: Substantial evidence indicates multiple mechanisms of CTX, with redox mechanisms playing a key role. Recent data singled out mitochondria as key targets for antineoplastic drug-induced CTX; understanding the underlying mechanisms is therefore cru-cial for effective cardioprotection, without compromising the efficacy of anti-cancer treat-ments...
April 11, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28388570/apocynin-attenuates-left-ventricular-remodeling-in-diabetic-rabbits
#13
Jiuchun Qiu, Jianping Zhao, Jian Li, Xue Liang, Yajuan Yang, Zhiwei Zhang, Xiaowei Zhang, Huaying Fu, Panagiotis Korantzopoulos, Gary Tse, Tong Liu, Guangping Li
INTRODUCTION: Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases are responsible for the generation of reactive oxygen species, producing vascular and myocardial dysfunction in diabetes mellitus. However, the potential benefits of the NADPH oxidase inhibitor, apocynin, on left ventricular (LV) remodeling remain unknown. RESULTS: In the diabetic group, interventricular septal thickness and left ventricular posterior wall thickness were markedly increased compared to control...
March 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28388526/sepsis-associated-in-hospital-cardiac-arrest-epidemiology-pathophysiology-and-potential-therapies
#14
REVIEW
Ryan W Morgan, Julie C Fitzgerald, Scott L Weiss, Vinay M Nadkarni, Robert M Sutton, Robert A Berg
Sepsis-associated cardiac arrest is a relatively common occurrence with especially poor outcomes. Of the greater than 200,000 in-hospital cardiac arrests that occur in the United States annually, between 30,000 and 60,000 occur in patients with underlying sepsis. These patients are less likely to survive than cardiac arrest victims without sepsis. In this review, we discuss the epidemiology of sepsis-associated in-hospital cardiac arrest in adults and children, the relevant physiology responsible for its pathogenesis and poor outcomes, and potential therapeutic interventions based on this pathophysiology...
March 31, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28382463/micrornas-association-in-the-cardiac-hypertrophy-secondary-to-complex-congenital-heart-disease-in-children
#15
Ma C Sánchez-Gómez, K A García-Mejía, M Pérez-Díaz Conti, G Díaz-Rosas, I Palma-Lara, R Sánchez-Urbina, M Klünder-Klünder, J A Botello-Flores, N A Balderrábano-Saucedo, A Contreras-Ramos
Complex congenital heart disease (CHD) affects cardiac blood flow, generating a pressure overload in the compromised ventricles and provoking hypertrophy that over time will induce myocardial dysfunction and cause a potential risk of imminent death. Therefore, the early diagnosis of complex CHD is paramount during the first year of life, with surgical treatment of patients favoring survival. In the present study, we analyzed cardiac tissue and plasma of children with cardiac hypertrophy (CH) secondary to CHD for the expression of 11 miRNAs specific to CH in adults...
April 5, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28382083/prognostic-implication-of-the-qrs-axis-and-its-association-with-myocardial-scarring-in-patients-with-left-bundle-branch-block
#16
Chan Soon Park, Myung-Jin Cha, Eue-Keun Choi, Seil Oh
BACKGROUND AND OBJECTIVES: Left bundle branch block (LBBB) with left axis deviation (LAD) has a worse prognosis than LBBB with a normal axis, and myocardial dysfunction has been suggested as a cause of left axis deviation. This study investigated the prognostic significance of the QRS axis in patients with LBBB and analyzed its relationship with the amount of myocardial scarring. SUBJECTS AND METHODS: A total of 829 patients were diagnosed with LBBB at Seoul National University Hospital from October 2004 to June 2014...
March 2017: Korean Circulation Journal
https://www.readbyqxmd.com/read/28377297/effect-of-prolonged-targeted-temperature-management-on-left-ventricular-myocardial-function-after-out-of-hospital-cardiac-arrest-a-randomised-controlled-trial
#17
Anders Morten Grejs, Bent Roni Ranghøj Nielsen, Peter Juhl-Olsen, Jakob Gjedsted, Erik Sloth, Johan Heiberg, Christian Alcaraz Frederiksen, Anni Nørgaard Jeppesen, Christophe Henri Valdemar Duez, Per Dreyer Hamre, Eldar Søreide, Hans Kirkegaard
AIM: To evaluate post-cardiac arrest myocardial dysfunction during prolonged targeted temperature management (TTM) compared with standard TTM in comatose out-of-hospital cardiac arrest (OHCA) survivors. METHODS: A randomised, controlled trial comparing myocardial function after TTM at 33 ±1°C for 48h compared with 24h. A total of 105 OHCA patients were computer-randomised to 24h (n=50) or 48h (n=55) of TTM. Transthoracic echocardiography was performed after 24h, 48h and 72h...
April 2, 2017: Resuscitation
https://www.readbyqxmd.com/read/28373243/myocardial-damage-detected-by-late-gadolinium-enhancement-cardiac-magnetic-resonance-is-uncommon-in-peripartum-cardiomyopathy
#18
Erik B Schelbert, Uri Elkayam, Leslie T Cooper, Michael M Givertz, Jeffrey D Alexis, Joan Briller, G Michael Felker, Sandra Chaparro, Angela Kealey, Jessica Pisarcik, James D Fett, Dennis M McNamara
BACKGROUND: In peripartum cardiomyopathy, the prevalence of focal myocardial damage detected by late gadolinium enhancement (LGE) cardiovascular magnetic resonance is important to elucidate mechanisms of myocardial injury and cardiac dysfunction. LGE equates irreversible myocardial injury, but LGE prevalence in peripartum cardiomyopathy is uncertain. METHODS AND RESULTS: Among 100 women enrolled within the Investigations of Pregnancy Associated Cardiomyopathy cohort, we recruited 40 women at 13 centers to undergo LGE cardiovascular magnetic resonance, enrolled within the first 13 weeks postpartum...
April 3, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28364479/detection-of-intraoperative-myocardial-dysfunction-by-accelerometer-during-aortic-valve-replacement
#19
Ole-Johannes H N Grymyr, Jan O Beitnes, Jo Eidet, Stein Tølløfsrud, Arnt Fiane, Helge Skulstad, Erik Fosse, Per S Halvorsen
OBJECTIVES: Myocardial dysfunction may occur during weaning from cardiopulmonary bypass (CPB). Epicardial accelerometers have been shown to be useful in continuous monitoring of myocardial ischaemia during beating-heart surgery. We aimed to investigate whether an accelerometer can detect myocardial dysfunction during weaning from CPB. METHODS: In 23 patients undergoing isolated aortic valve replacement (AVR), a three-axis accelerometer was attached to the left ventricle and 3D velocity was calculated from the signals...
February 1, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28349068/reducing-caloric-intake-prevents-ischemic-injury-and-myocardial-dysfunction-and-affects-anesthetic-cardioprotection-in-type-2-diabetic-rats
#20
Charissa E van den Brom, Christa Boer, Rob F P van den Akker, Stephan A Loer, R Arthur Bouwman
Background. Type 2 diabetes mellitus (T2DM) increases the risk of myocardial ischemia, followed by increased perioperative risk of cardiovascular morbidity. We investigated whether reducing caloric intake reduces ischemic injury and myocardial dysfunction and affects the protective effects of the volatile anesthetic sevoflurane in diet-induced T2DM rats. Methods. Rats received a western (WD) or control diet (CD). Caloric intake was reduced by reversing WD-fed rats to CD. Myocardial function was determined with echocardiography...
2017: Journal of Diabetes Research
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