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Myocardial Injury

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https://www.readbyqxmd.com/read/27914358/defining-the-role-of-perioperative-statin-treatment-in-patients-after-cardiac-surgery-a-meta-analysis-and-systematic-review-of-20-randomized-controlled-trials
#1
Xin Yuan, Jianlin Du, Qi Liu, Ling Zhang
BACKGROUND: Although statin use has been indicated to prevent atrial fibrillation in previous observational and experimental trials, the issue remains inadequately and insufficiently explored. We therefore performed this meta-analysis to evaluate the effects of perioperative statin therapy on complications and short-term prognosis following cardiac surgery. METHODS: A search of the PubMed, EMBASE and the Cochrane database of controlled trials was performed from inception to June 2016 to identify relevant randomized controlled trials (RCTs)...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27914007/evaluation-of-68-ga-labeled-peptide-tracer-for-detection-of-gelatinase-expression-after-myocardial-infarction-in-rat
#2
Max Kiugel, Ville Kytö, Tiina Saanijoki, Heidi Liljenbäck, Olli Metsälä, Mia Ståhle, Johanna Tuomela, Xiang-Guo Li, Pekka Saukko, Juhani Knuuti, Anne Roivainen, Antti Saraste
BACKGROUND: Matrix metalloproteinases 2 and 9 (MMP-2/9) play a role in extracellular matrix remodeling after an ischemic myocardial injury. We evaluated (68)Ga-DOTA-peptide targeting MMP-2/9 for the detection of gelatinase expression after myocardial infarction (MI) in rat. METHODS: Rats were injected with 43 ± 7.7 MBq of (68)Ga-DOTA-peptide targeting MMP-2/9 at 7 days (n = 7) or 4 weeks (n = 8) after permanent coronary ligation or sham operation (n = 5 at both time points) followed by positron emission tomography (PET)...
December 2, 2016: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/27913766/myocardial-cytochrome-oxidase-activity-increases-with-age-and-hypoxemia-in-patients-with-congenital-heart-disease
#3
Michael Onwugbufor, Richard J Levy, David Zurakowski, Richard A Jonas, Pranava Sinha
BACKGROUND: Myocardial tolerance to ischemia is influenced by age and preoperative cyanosis through unknown mechanisms and significantly affects postoperative outcomes. Cytochrome c oxidase (CcOx), the terminal enzyme of the mitochondrial electron transport chain, may play a role in the susceptibility to ischemic-reperfusion (IR) injury. Our study aimed at investigating changes in human myocardial CcOx activity based on age and preoperative oxygen saturation to understand its role in transition from neonatal to mature myocardium and hypoxic conditions...
December 1, 2016: Perfusion
https://www.readbyqxmd.com/read/27913400/incidence-risk-factors-and-outcome-of-life-threatening-ventricular-arrhythmias-in-giant-cell-myocarditis
#4
Kaj Ekström, Jukka Lehtonen, Riina Kandolin, Anne Räisänen-Sokolowski, Kaisa Salmenkivi, Markku Kupari
BACKGROUND: Ventricular tachyarrhythmias are characteristic of giant cell myocarditis, but their true incidence, predictors, and outcome are unknown. METHODS AND RESULTS: Our work involved 51 patients with giant cell myocarditis (35 women) aged 52±12 years. Their medical records were reviewed for history, results of laboratory and imaging studies, and occurrence of serious cardiac events, including life-threatening ventricular tachyarrhythmias. Sudden cardiac death (fatal or aborted) was the primary end point of our analyses, whereas the composite of sudden cardiac death and ventricular tachycardia requiring treatment constituted the secondary end point...
December 2016: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/27911394/confirmation-of-myocardial-ischemia-and-reperfusion-injury-in-mice-using-surface-pad-electrocardiography
#5
Stephanie L C Scofield, Krishna Singh
Many animal models have been established for the study of myocardial remodeling and heart failure due to its status as the number one cause of mortality worldwide. In humans, a pathologic occlusion forms in a coronary artery and reperfusion of that occluded artery is considered essential to maintain viability of the myocardium at risk. Although essential for myocardial recovery, reperfusion of the ischemic myocardium creates its own tissue injury. The physiologic response and healing of an ischemia/reperfusion injury is different from a chronic occlusion injury...
November 24, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910887/energy-metabolism-regulated-by-hdac-inhibitor-attenuates-cardiac-injury-in-hemorrhagic-rat-model
#6
Qiyuan Kuai, Chunyan Wang, Yanbing Wang, Weijing Li, Gongqing Zhang, Zhixin Qiao, Min He, Xuanlin Wang, Yu Wang, Xingwei Jiang, Lihua Su, Yuezhong He, Suping Ren, Qun Yu
A disturbance of energy metabolism reduces cardiac function in acute severe hemorrhagic patients. Alternatively, adequate energy supply reduces heart failure and increases survival. However, the approach to regulating energy metabolism conductive to vital organs is limited, and the underlying molecular mechanism remains unknown. This study assesses the ability of histone deacetylase inhibitors (HDACIs) to preserve cardiac energy metabolism during lethal hemorrhagic injury. In the lethally hemorrhagic rat and hypoxic myocardial cells, energy metabolism and heart function were well maintained following HDACI treatment, as evident by continuous ATP production with normal cardiac contraction...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910042/direct-cardiac-reprogramming-as-a-novel-therapeutic-strategy-for-treatment-of-myocardial-infarction
#7
Hong Ma, Li Wang, Jiandong Liu, Li Qian
Direct reprogramming of fibroblasts into induced cardiomyocytes (iCMs) holds great promise as a novel therapy for the treatment of heart failure, a common and morbid disease that is usually caused by irreversible loss of functional cardiomyocytes (CMs). Recently, we and others showed that in a murine model of acute myocardial infarction, delivery of three transcription factors, Gata4, Mef2c, and Tbx5 converted endogenous cardiac fibroblasts into functional iCMs. These iCMs integrated electrically and mechanically with surrounding myocardium, resulting in a reduction in scar size and an improvement in heart function...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27909864/effects-of-chronic-and-acute-zinc-supplementation-on-myocardial-ischemia-reperfusion-injury-in-rats
#8
Serhan Ozyıldırım, Abdulkerim Kasim Baltaci, Engin Sahna, Rasim Mogulkoc
The present study aims to explore the effects of chronic and acute zinc sulfate supplementation on myocardial ischemia-reperfusion injury in rats. The study registered 50 adult male rats which were divided into five groups in equal numbers as follows: group 1, normal control; group 2, sham; group 3, myocardial ischemia reperfusion (My/IR): the group which was fed on a normal diet and in which myocardial I/R was induced; group 4, myocardial ischemia reperfusion + chronic zinc: (5 mg/kg i.p. zinc sulfate for 15 days); and group 5, myocardial ischemia reperfusion + acute zinc: the group which was administered 15 mg/kg i...
December 1, 2016: Biological Trace Element Research
https://www.readbyqxmd.com/read/27909014/sodium-4-phenylbutyrate-attenuates-myocardial-reperfusion-injury-by-reducing-the-unfolded-protein-response
#9
Osamu Takatori, Soichiro Usui, Masaki Okajima, Shuichi Kaneko, Hiroshi Ootsuji, Shin-Ichiro Takashima, Daisuke Kobayashi, Hisayoshi Murai, Hiroshi Furusho, Masayuki Takamura
BACKGROUND: The unfolded protein response (UPR) plays a pivotal role in ischemia-reperfusion (I/R) injury in various organs such as heart, brain, and liver. Sodium 4-phenylbutyrate (PBA) reportedly acts as a chemical chaperone that reduces UPR. In the present study, we evaluated the effect of PBA on reducing the UPR and protecting against myocardial I/R injury in mice. METHODS: Male C57BL/6 mice were subjected to 30-minute myocardial I/R, and were treated with phosphate-buffered saline (as a vehicle) or PBA...
December 1, 2016: Journal of Cardiovascular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/27908971/13n-ammonia-pet-ct-detection-of-myocardial-perfusion-abnormalities-in-beagle-dogs-after-local-heart-irradiation
#10
Jianbo Song, Rui Yan, Zhifang Wu, Jianguo Li, Min Yan, Xinzhong Hao, Jianzhong Liu, Sijin Li
: To determine the potential value of (13)N-ammonia positron emission tomography (PET)/computed tomography (CT) myocardial perfusion imaging (MPI) for detection of myocardial perfusion changes at early stage induced by radiation damage. METHODS: Thirty-six Beagle dogs were randomly divided into the control (n = 18) or the irradiation groups (n = 18). The irradiation group underwent local irradiation to the left ventricular anterior cardiac wall with a single dose of 20 Gy, whereas the control group received sham irradiation...
December 1, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27908708/chlorogenic-acid-ameliorates-isoproterenol-induced-myocardial-injury-in-rats-by-stabilizing-mitochondrial-and-lysosomal-enzymes
#11
Palaniyandi Akila, Lourthurani Asaikumar, Lakshmanan Vennila
This study was deliberated to aspire the effects of chlorogenic acid (CGA) against myocardial infarction (MI) induced by Isoproterenol (ISO), in a rat model. In the pathology of MI, enzymes released due to the mitochondrial and lysosomal lipid peroxidation play an integral role. Induction of rats with ISO (85mg/kg BW) for 2 consecutive days resulted in a significant decrease in the activities of heart mitochondrial enzymes isocitrate dehydrogenase (ICDH), α-ketoglutarate dehydrogenase (α-KGDH), succinate dehydrogenase (SDH) and malate dehydrogenase (MDH)...
November 28, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27907878/ultrasound-in-cardiac-trauma
#12
Theodosios Saranteas, Andreas F Mavrogenis, Christina Mandila, John Poularas, Fotios Panou
In the perioperative period, the emergency department or the intensive care unit accurate assessment of variable chest pain requires meticulous knowledge, diagnostic skills, and suitable usage of various diagnostic modalities. In addition, in polytrauma patients, cardiac injury including aortic dissection, pulmonary embolism, acute myocardial infarction, and pericardial effusion should be immediately revealed and treated. In these patients, arrhythmias, mainly tachycardia, cardiac murmurs, or hypotension must alert physicians to suspect cardiovascular trauma, which would potentially be life threatening...
November 5, 2016: Journal of Critical Care
https://www.readbyqxmd.com/read/27907155/outer-balloon-ligation-increases-success-rate-of-ischemia-reperfusion-injury-model-in-mice
#13
Fengwang Hu, Nana Zhai, Wen Gao, Pei Wu, Yuanyuan Luo, Defeng Pan, Yang Liu, Dongye Li
BACKGROUND: Coronary artery disease is a growing public health problem and a major cause of morbidity and mortality. Experimental animal models provide valuable tools for studying myocardial ischemia reperfusion (I/R) injury in vivo. OBJECTIVE: The purpose of this study was to describe a new method (outer balloon ligation) to induce myocardial I/R injury in mice. METHODS: Ninety-nine male C57BL/6J mice were randomly divided into three groups: sham group, classic method group (I/R-C) and the new method group (I/R-N)...
2016: PloS One
https://www.readbyqxmd.com/read/27906830/heterotopic-abdominal-rat-heart-transplantation-as-a-model-to-investigate-volume-dependency-of-myocardial-remodeling
#14
Kálmán Benke, Alex Ali Sayour, Csaba Mátyás, Bence Ágg, Balázs Tamás Németh, Attila Oláh, Mihály Ruppert, István Hartyánszky, Zoltán Szabolcs, Tamás Radovits, Béla Merkely, Gábor Szabó
Heterotopic abdominal rat heart transplantation has been extensively used to investigate ischemic/reperfusion injury, immunological consequences during heart transplantations and also to study remodeling of the myocardium due to volume unloading. We provide a unique review on the latter and present a summary of the experimental studies on rat heart transplantation to illustrate changes that occur to the myocardium due to volume unloading. We divided the literature based on whether normal or failing rat heart models were used...
December 1, 2016: Transplantation
https://www.readbyqxmd.com/read/27905474/inflammatory-processes-in-cardiovascular-disease-a-route-to-targeted-therapies
#15
REVIEW
Neil Ruparelia, Joshua T Chai, Edward A Fisher, Robin P Choudhury
Inflammatory processes are firmly established as central to the development and complications of cardiovascular diseases. Elevated levels of inflammatory markers have been shown to be predictive of future cardiovascular events. The specific targeting of these processes in experimental models has been shown to attenuate myocardial and arterial injury, reduce disease progression, and promote healing. However, the translation of these observations and the demonstration of clear efficacy in clinical practice have been disappointing...
December 1, 2016: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/27905409/compound-danshen-dripping-pills-modulate-the-perturbed-energy-metabolism-in-a-rat-model-of-acute-myocardial-ischemia
#16
Jiahua Guo, Yonghong Yong, Jiye Aa, Bei Cao, Runbin Sun, Xiaoyi Yu, Jingqiu Huang, Na Yang, Lulu Yan, Xinxin Li, Jing Cao, Nan Aa, Zhijian Yang, Xiangqing Kong, Liansheng Wang, Xuanxuan Zhu, Xiaohui Ma, Zhixin Guo, Shuiping Zhou, He Sun, Guangji Wang
The continuous administration of compound danshen dripping pills (CDDP) showed good efficacy in relieving myocardial ischemia clinically. To probe the underlying mechanism, metabolic features were evaluated in a rat model of acute myocardial ischemia induced by isoproterenol (ISO) and administrated with CDDP using a metabolomics platform. Our data revealed that the ISO-induced animal model showed obvious myocardial injury, decreased energy production, and a marked change in metabolomic patterns in plasma and heart tissue...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904701/sirt6-suppresses-mitochondrial-defects-and-cell-death-via-the-nf-%C3%AE%C2%BAb-pathway-in-myocardial-hypoxia-reoxygenation-induced-injury
#17
Ming-Yue Cheng, You-Wei Cheng, Jun Yan, Xiao-Qin Hu, Hui Zhang, Zhi-Rong Wang, Qin Yin, Wei Cheng
The present study explored changes of the SIRT6/NF-κB pathway in myocardial hypoxia/reoxygenation induced injury and the effects on mitochondrial damage and myocardial damage by regulating SIRT6. SIRT6 expression decreased and NF-κB expression increased in H9c2 cells during hypoxic injury. Cell death and mitochondrial defects paralleled mPTP opening, and a decrease in ΔΨm occurred in hypoxic myocytes compared with normoxic control cells in annexin V and propidium iodide staining and TUNEL results. These effects were suppressed in cells overexpressing SIRT6, but reemerged in cells expressing the SIRT6 mutant...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27904669/astragaloside-iv-enhances-cardioprotection-of-remote-ischemic-conditioning-after-acute-myocardial-infarction-in-rats
#18
Songyi Cheng, Peng Yu, Li Yang, Haibo Shi, Anxia He, Hanyu Chen, Jie Han, Liang Xie, Jiandong Chen, Xiaohu Chen
BACKGROUND: Remote ischemic conditioning (RIC) has been shown to be a practical method for protecting the heart from ischemic/reperfusion (I/R) injury. In the present study, we investigated whether or not the combination of RIC and Astragaloside IV (AS-IV) could improve cardioprotection against acute myocardial infarction (AMI)-induced heart failure (HF) when compared with individual treatments. MATERIAL AND METHODS: A rat model of AMI was established via permanent ligation of the left anterior descending coronary artery (LAD)...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27903616/immediate-rule-out-of-acute-myocardial-infarction-using-electrocardiogram-and-baseline-high-sensitivity-troponin-i
#19
Johannes Tobias Neumann, Nils Arne Sörensen, Francisco Ojeda, Tjark Schwemer, Jonas Lehmacher, Saskia Gönner, Nikolas Jarsetz, Till Keller, Sarina Schaefer, Thomas Renné, Ulf Landmesser, Peter Clemmensen, Nataliya Makarova, Renate B Schnabel, Tanja Zeller, Mahir Karakas, John W Pickering, Martin Than, William Parsonage, Jaimi Greenslade, Louise Cullen, Dirk Westermann, Stefan Blankenberg
AIMS: Serial measurements of high-sensitivity troponin are used to rule out acute myocardial infarction (AMI) with an assay specific cutoff at the 99th percentile. Here, we evaluated the performance of a single admission troponin with a lower cutoff combined with a low risk electrocardiogram (ECG) to rule out AMI. METHODS: Troponin I measured with a high-sensitivity assay (hs-TnI) was determined at admission in 1040 patients presenting with suspected AMI (BACC study)...
November 30, 2016: Clinical Chemistry
https://www.readbyqxmd.com/read/27903549/microvascular-integrity-in-myocardial-injury-the-irony-of-iron-deposition
#20
EDITORIAL
Navneet Narula, Nupoor Narula, Amir Ahmadi
No abstract text is available yet for this article.
November 2016: Circulation. Cardiovascular Imaging
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