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Oxygen in myocardial infarction

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https://www.readbyqxmd.com/read/29054200/the-role-of-acute-circulatory-support-in-st-segment-elevation-myocardial-infarction-complicated-by-cardiogenic-shock
#1
REVIEW
Michele Esposito, Yousef Bader, Robert Pedicini, Catalina Breton, Andrew Mullin, Navin K Kapur
In the setting of ST-segment elevation myocardial infarction (STEMI) complicated by cardiogenic shock, three primary treatment objectives include providing circulatory support, ventricular unloading, and restoring myocardial perfusion. In addition to primary percutaneous coronary intervention, each of these three objectives can be achieved with appropriate use of an acute mechanical circulatory support (AMCS) pump. Over the past decade, utilization of percutaneously-delivered AMCS devices including the Impella axial-flow catheter, TandemHeart left atrial-to-femoral artery bypass system, and veno-arterial extracorporeal membrane oxygenation (VA-ECMO) has grown exponentially...
September 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/29051185/cgmp-elevating-compounds-and-ischemic-conditioning-provide-cardioprotection-against-ischemia-and-reperfusion-injury-via-cardiomyocyte-specific-bk-channels
#2
Sandra Frankenreiter, Piotr Bednarczyk, Angelina Kniess, Nadja Bork, Julia Straubinger, Piotr Koprowski, Antoni Wrzosek, Eva Mohr, Angela Logan, Michael P Murphy, Meinrad Gawaz, Thomas Krieg, Adam Szewczyk, Viacheslav O Nikolaev, Peter Ruth, Robert Lukowski
Background -The nitric oxide-sensitive guanylyl cyclase (NO-GC)/cyclic guanosine-3',5'-monophosphate (cGMP)/cGMP-dependent protein kinase type I (cGKI)-signaling pathway can afford protection against the ischemia and reperfusion (I/R) injury that occurs during myocardial infarction (MI). Reportedly, voltage and Ca(2+)-activated K(+) channels of the BK-type are stimulated by cGMP/cGKI and recent ex-vivo studies implicated that increased BK activity favors the survival of the myocardium at I/R. It remains unclear, however, whether the molecular events downstream of cGMP involve BK channels present in cardiomyocytes (CMs) or in other cardiac cell types...
October 19, 2017: Circulation
https://www.readbyqxmd.com/read/29030392/hydrogen-sulfide-preserves-enos-function-by-inhibiting-pyk2-implications-for-cardiomyocyte-survival-and-cardioprotection
#3
Sofia-Iris Bibli, Csaba Szabo, Athanasia Chatzianastasiou, Bert Luck, Sven Zukunft, Ingrid Fleming, Andreas Papapetropoulos
Hydrogen sulfide (H2S) exhibits beneficial effects in the cardiovascular system, many of which depend on nitric oxide (NO). Proline-rich tyrosine kinase 2 (PYK2), a redox-sensitive tyrosine kinase, directly phosphorylates and inhibits eNOS. Herein, we investigated the ability of H2S to relieve PYK2-mediated eNOS inhibition and evaluated the importance of the H2S/PYK2/eNOS axis on cardiomyocyte injury in vitro and in vivo. Exposure of H9c2 cardiomyocytes to H2O2 or pharmacological inhibition of H2S production increased PYK2 (Y402) and eNOS (Y656) phosphorylation...
October 13, 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/29026009/inactivated-lactobacillus-promotes-the-protection-against-myocardial-ischemia-reperfusion-injury-through%C3%A2-nf-%C3%AE%C2%BA-b-pathway
#4
Ni Wang, Genhong Song, Yang Yang, Weiwei Yuan, Ming Qi
Objectives: Although restoration of blood flow to an ischemic organ is essential to prevent irreversible cellular injury, reperfusion may augment tissue injury in excess of that produced by ischemia alone. So this experiment was designed to study the protective effects and mechanism of inactivated lactobacillus (Lac) on myocardial ischemia reperfusion injury (MIRI). Methods: MIRI rat models were established by ligation of left anterior descending coronary artery for about 30 min and then, reperfusion for 120 min and divided into control group, model group and Lac (10(6), 10(7) and 10(8)cfu/kg) groups...
October 12, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/29018142/adiponectin-has-a-pivotal-role-in-the-cardioprotective-effect-of-cp-3-iv-a-selective-cd36-azapeptide-ligand-after-transient-coronary-artery-occlusion-in-mice
#5
David N Huynh, Valérie L Bessi, Liliane Ménard, Jérôme Piquereau, Caroline Proulx, Maria Febbraio, William D Lubell, André C Carpentier, Yan Burelle, Huy Ong, Sylvie Marleau
CD36 is a multiligand receptor involved in lipid metabolism. We investigated the mechanisms underlying the cardioprotective effect of CP-3(iv), an azapeptide belonging to a new class of selective CD36 ligands. The role of CP-3(iv) in mediating cardioprotection was investigated because CD36 signaling leads to activation of peroxisome proliferator-activated receptor-γ, a transcriptional regulator of adiponectin. CP-3(iv) pretreatment reduced infarct size by 54% and preserved hemodynamics in C57BL/6 mice subjected to 30 min coronary ligation and reperfusion but had no effect in CD36-deficient mice...
October 10, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29017659/-massive-pulmonary-embolism-similar-to-acute-myocardial-infarction-rescued-by-ecmo-a-case-report
#6
Wenqing Gao, Tong Li, Xiaomin Hu, Dawei Duan, Peng Wu, Yue Zhao, Meng Ning
Acute myocardial infarction (AMI) and acute massive pulmonary embolism can be characterized by no pulse electrical activity. Patients of cardiac arrest (CA) with no pulse electrical activity have a high mortality rate before the cause was corrected. Extracorporeal membrane oxygenation (ECMO), as a kind of artificial heart-lung support organ, provides treatment for CA patients. A case of massive pulmonary embolism similar to AMI was treated in the Third Central Hospital of Tianjin, who received interventional thrombolysis assisted by ECMO...
October 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29017650/-effect-of-dynamin-related-protein-1-in-rats-with-myocardial-ischemia-reperfusion-injury
#7
Yanli Yang, Jun Ma, Duomao Lin
OBJECTIVE: To investigate the protective effect of dynamin-related protein 1 (Drp1) in rats with myocardial ischemia/reperfusion injury (IRI). METHODS: Twenty-four healthy male Wistar rats were randomly divided into three groups (n = 8 each): sham group, IRI model group, and Drp1 inhibitor group. The left anterior descending branch of coronary artery was ligated to produce myocardial ischemia for 30 minutes and reperfusion injury model. Sham group was received only threading without ligation...
October 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28990736/hospital-outcomes-of-transcatheter-versus-surgical-aortic-valve-replacement-in-female-in-the-united-states
#8
Tomo Ando, Emmanuel Akintoye, Tesfaye Telila, Alexandros Briasouolis, Hisato Takagi, Theodore Schreiber, Luis Afonso, Cindy L Grines
OBJECTIVES: To assess the in-hospital mortality and complications in female between transcatheter aortic valve replacement (TAVR) and surgical aortic valve replacement (SAVR). BACKGROUND: Female is one of the risk factors for increased adverse events in cardiac surgery. METHODS AND RESULTS: Nationwide Inpatient Sample database was queried from 2011 to 2014 for patients who underwent TAVR or SAVR in female patients. The primary endpoint was in-hospital all-cause mortality and second endpoints were perioperative complications...
October 9, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28984631/right-ventricular-perfusion-physiology-and-clinical-implications
#9
George J Crystal, Paul S Pagel
Regulation of blood flow to the right ventricle differs significantly from that to the left ventricle. The right ventricle develops a lower systolic pressure than the left ventricle, resulting in reduced extravascular compressive forces and myocardial oxygen demand. Right ventricular perfusion has eight major characteristics that distinguish it from left ventricular perfusion: (1) appreciable perfusion throughout the entire cardiac cycle; (2) reduced myocardial oxygen uptake, blood flow, and oxygen extraction; (3) an oxygen extraction reserve that can be recruited to at least partially offset a reduction in coronary blood flow; (4) less effective pressure-flow autoregulation; (5) the ability to downregulate its metabolic demand during coronary hypoperfusion and thereby maintain contractile function and energy stores; (6) a transmurally uniform reduction in myocardial perfusion in the presence of a hemodynamically significant epicardial coronary stenosis; (7) extensive collateral connections from the left coronary circulation; and (8) possible retrograde perfusion from the right ventricular cavity through the Thebesian veins...
October 4, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28982666/platelet-specific-p38%C3%AE-deficiency-improved-cardiac-function-after-myocardial-infarction-in-mice
#10
Panlai Shi, Lin Zhang, Mingliang Zhang, Wenlong Yang, Kemin Wang, Junfeng Zhang, Kinya Otsu, Gonghua Huang, Xuemei Fan, Junling Liu
OBJECTIVE: MAPKs (mitogen-activated protein kinases), especially p38, play detrimental roles in cardiac diseases and cardiac remodeling post-myocardial infarction. However, the activation and function of MAPKs in coronary thrombosis in vivo and its relationship with clinical outcomes remain poorly understood. APPROACH AND RESULTS: Here, we showed that p38α was the major isoform expressed in human and mouse platelets. Platelet-specific p38α-deficient mice presented impaired thrombosis and hemostasis but had improved cardiac function, reduced infarct size, decreased inflammatory response, and microthrombus in a left anterior descending artery ligation model...
October 5, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28980287/inducible-mir-145-expression-by-hif-1%C3%AE-protects-cardiomyocytes-against-apoptosis-via-regulating-sgk1-in-simulated-myocardial-infarction-hypoxic-microenvironment
#11
Nianzi Sun, Fanyan Meng, Ning Xue, Guanghui Pang, Qingxin Wang, Hongliang Ma
BACKGROUND: Myocardial infarction (MI) is partly due to myocardial cell damage caused by hypoxia. MicroRNAs (miRNAs) have been proved to be closely related to the development and progression of many cardiovascular diseases. This study investigated the role of miR-145 in cardiomyocytes under hypoxic condition. METHODS: The quantitative real-time polymerase chain reaction (qPCR) was performed to test miR-145 expression in H9c2 cells with HIF-1α abnormal expression under hypoxic condition...
October 5, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/28977576/postinfarction-left-ventricular-free-wall-rupture-a-17-year-single-centre-experience
#12
Francesco Formica, Serena Mariani, Gurmeet Singh, Stefano D'Alessandro, Luigi Amerigo Messina, Norman Jones, Oluwaseun Adebayo Bamodu, Fabio Sangalli, Giovanni Paolini
OBJECTIVES: Left ventricular free wall rupture (LVFWR) is a catastrophic complication following acute myocardial infarction with an estimated incidence of 0.2-7.6% and mortality can be as high as 60%. This study aimed to identify the risk factors for morbidity and mortality in patients affected by LVFWR. METHODS: This is a retrospective study of 35 patients who underwent surgery for LVFWR between January 2000 and December 2016 at our institution. RESULTS: The mean age of patients was 68...
August 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28963749/chronic-total-occlusion-in-non-infarct-related-artery-is-associated-with-increased-short-and-long-term-mortality-in-patients-with-st-segment-elevation-acute-myocardial-infarction-complicated-by-cardiogenic-shock-from-the-credo-kyoto-ami-registry
#13
Hiroki Watanabe, Takeshi Morimoto, Hiroki Shiomi, Tetsuma Kawaji, Yutaka Furukawa, Yoshihisa Nakagawa, Kenji Ando, Kazushige Kadota, Takeshi Kimura
OBJECTIVES: We aimed to investigate the effect of chronic total occlusion (CTO) in non-infarct-related artery (IRA) on short- and long-term mortality in ST-segment elevation myocardial infarction (STEMI) patients complicated by cardiogenic shock (CS). BACKGROUND: Previous studies show contradictory results about the clinical effect of CTO in non-IRA on short-term mortality in STEMI patients with CS. METHODS: From the CREDO-Kyoto AMI registry enrolling 5429 patients, the current study population consisted of 313 STEMI patients with multivessel disease complicated by CS who underwent primary PCI for the nonleft main coronary artery culprit lesion within 24 hr after onset...
September 30, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28951984/remote-ischemic-preconditioning-protects-human-neural-stem-cells-from-oxidative-stress
#14
Ayako Motomura, Mikiko Shimizu, Akira Kato, Kazuya Motomura, Akane Yamamichi, Hiroko Koyama, Fumiharu Ohka, Tomohide Nishikawa, Yusuke Nishimura, Masahito Hara, Tetsuya Fukuda, Yasuhiko Bando, Toshihide Nishimura, Toshihiko Wakabayashi, Atsushi Natsume
In previous clinical trials, we showed that remote ischemic preconditioning (rIPC) reduced myocardial damage in children undergoing treatment for congenital heart defects and postoperative renal failure in patients undergoing abdominal aortic aneurysm surgery. In rabbit experiments, pre-treatment with plasma and plasma dialysate (obtained using 15-kDa cut-off dialysis membrane) from donor rabbits subjected to rIPC similarly protected against cardiac infarction. However, the protective substances containing in rIPC plasma have been unknown...
September 26, 2017: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/28946755/elevated-dna-damage-oxidative-stress-and-impaired-response-defense-system-inflicted-in-patients-with-myocardial-infarction
#15
Sumayya Shahzad, Asif Hasan, Abul Faiz Faizy, Somaiya Mateen, Naureen Fatima, Shagufta Moin
BACKGROUND: Ischemic tissue damage in myocardial infarction (MI) is allied with the exaggerated production of reactive oxygen species (ROS) beyond the countering capability of chain-breaking radical scavengers, fallouts in the form of oxidatively burdened myocardial tissue. METHODS: One hundred and twenty five patients with MI were included in the study to evaluate the dynamics of redox status of patients by monitoring the antioxidant potential, biomarkers of oxidative stress, lipid indices, RBC membrane damage when compared to healthy individuals in patients with MI congregated on the basis of Global Registry of Acute Coronary Events (GRACE) score, risk factors, and age...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28944912/dhhp%C3%A2-6-attenuates-cerebral-ischemia%C3%A2-reperfusion-injury-in-rats-through-the-inhibition-of-apoptosis
#16
Yingshi Ji, Xin Yan, Yang Hu, Huan Xue, Jianfeng Sun, Huaqiu Chen, Jiayu Zhang, Liping Wang, Baigong Xue, Li Sun
As a novel reactive oxygen species (ROS) scavenger, deuterohemin His peptide‑6 (DhHP‑6) has been demonstrated to prolong the lifespan of Caenorhabditis elegans and has also exhibited protective effects in myocardial ischemia‑reperfusion injury. Whether similar effects occur during cerebral ischemia‑reperfusion (CIR) injury remains to be elucidated. The present study evaluated the function of DhHP‑6 and its underlying mechanisms in a middle cerebral artery occlusion (MCAO) model in rats. The focal transient MCAO model was implemented using the Longa method of ischemia for 2 h followed by reperfusion for 22 h in male Wistar rats...
November 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28942242/hypoxia-inducible-factor-as-a-therapeutic-target-for-atherosclerosis
#17
REVIEW
Tanmay Jain, Eleni Aliki Nikolopoulou, Qingbo Xu, Aijuan Qu
Atherosclerosis is a highly prevalent disease that can significantly increase the risk of major vascular events, such as myocardial or cerebral infarctions. The anoxemia theory states that a disparity between oxygen supply and demand contributes to atherosclerosis. Hypoxia inducible factor-1 (HIF-1) is a heterodimeric protein, part of the basic helix-loop-helix family and one of the main regulators of cellular responses in a low‑oxygen environment. It plays a key role in the development of atherosclerosis through cell-specific responses, acting on endothelial cells, vascular smooth muscle cells (SMCs) and macrophages...
September 20, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28938862/rgdfk-peptide-modified-alginate-scaffold-for-cell-transplantation-and-cardiac-neovascularization
#18
Hugo Sondermeijer, Piotr Witkowski, Tetsunori Seki, Arnoud van der Laarse, Silviu Itescu, Mark Adam Hardy
Cell implantation for tissue repair is a promising new therapeutic strategy. Although direct injection of cells into tissue is appealing, cell viability and retention are not very good. Cell engraftment and survival following implantation are dependent on a sufficient supply of oxygen and nutrients via functional microcirculation as well as a suitable local microenvironment for implanted cells. Here, we describe the development of a porous, biocompatible, 3-dimensional alginate scaffold covalently modified with the synthetic cyclic RGDfK (Arg-Gly-Asp-D-Phe-Lys)-peptide...
September 22, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28929735/heart-repair-using-nanogel-encapsulated-human-cardiac-stem-cells-in-mice-and-pigs-with-myocardial-infarction
#19
Junnan Tang, Xiaolin Cui, Thomas G Caranasos, M Taylor Hensley, Adam C Vandergriff, Yusak Hartanto, Deliang Shen, Hu Zhang, Jinying Zhang, Ke Cheng
Stem cell transplantation is currently implemented clinically but is limited by low retention and engraftment of transplanted cells and the adverse effects of inflammation and immunoreaction when allogeneic or xenogeneic cells are used. Here, we demonstrate the safety and efficacy of encapsulating human cardiac stem cells (hCSCs) in thermosensitive poly(N-isopropylacrylamine-co-acrylic acid) or P(NIPAM-AA) nanogel in mouse and pig models of myocardial infarction (MI). Unlike xenogeneic hCSCs injected in saline, injection of nanogel-encapsulated hCSCs does not elicit systemic inflammation or local T cell infiltrations in immunocompetent mice...
September 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28906548/activation-of-g-protein-coupled-oestrogen-receptor-1-at-the-onset-of-reperfusion-protects-the-myocardium-against-ischemia-reperfusion-injury-by-reducing-mitochondrial-dysfunction-and-mitophagy
#20
Yansheng Feng, Ngonidzashe B Madungwe, Carolina Victoria da Cruz Junho, Jean C Bopassa
BACKGROUND AND PURPOSE: Recent evidence indicates that GPER (G protein-coupled oestrogen receptor 1) mediates acute pre-ischaemic oestrogen-induced protection of the myocardium from ischaemia/reperfusion injury via a signalling cascade that includes PKC translocation, ERK1/2/ GSK-3β phosphorylation and inhibition of the mitochondrial permeability transition pore (mPTP) opening. Here, we investigated the impact and mechanism involved in post-ischaemic GPER activation in ischaemia/reperfusion injury...
September 14, 2017: British Journal of Pharmacology
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