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Myocardial ischemia

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https://www.readbyqxmd.com/read/29676955/mitochondrial-genome-modulates-myocardial-akt-glut-hk-salvage-pathway-in-spontaneously-hypertensive-rats-adapted-to-chronic-hypoxia
#1
Iveta Nedvedova, David Kolar, Barbara Elsnicova, Daniela Hornikova, Jiri Novotny, Martin Kalous, Michal Pravenec, Jan Neckar, Frantisek Kolar, Jitka M Zurmanova
Recently we have shown that adaptation to continuous normobaric hypoxia (CNH) decreases myocardial ischemia/reperfusion injury in spontaneously hypertensive rats (SHR) and in conplastic strain (SHR-mtBN ). The protective effect was stronger in the latter group characterized by a selective replacement of SHR mitochondrial genome with that of a more ischemia-resistant Brown Norway strain. The aim of the present study was to examine the possible involvement of the hypoxia inducible factor (HIF)-dependent pathway of the protein kinase B/glucose transporters/hexokinase (Akt/GLUT/HK) in this mitochondrial genome-related difference of the cardioprotective phenotype...
April 20, 2018: Physiological Genomics
https://www.readbyqxmd.com/read/29676045/prognostic-value-of-positive-t-wave-in-lead-avr-in-patients-with-non-st-segment-myocardial-infarction
#2
Ahmad Separham, Bahram Sohrabi, Arezou Tajlil, Leili Pourafkari, Robabeh Sadeghi, Samad Ghaffari, Nader D Nader
BACKGROUND: Lead aVR provides prognostic information in various settings in patients with ischemia. We aim to investigate the role of a positive T wave in lead aVR in non-ST segment myocardial infarction (NSTEMI). METHODS: In a prospective cohort study, we included 400 patients with NSTEMI. Presentation electrocardiogram (ECG) was investigated for presence of a positive T wave as well as ST segment elevation (STE) in aVR and study variables were compared. Predictors of primary outcome defined as hospital major adverse cardiovascular events (MACE) and secondary outcome, defined as three-vessel coronary disease and/or left main coronary artery stenosis (3VD/LMCA) stenosis in angiography, were determined in multivariate logistic regression analysis...
April 19, 2018: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/29675278/adrenocorticotropic-hormone-secreting-pheochromocytoma-underlying-glucocorticoid-induced-pheochromocytoma-crisis
#3
Gil A Geva, David J Gross, Haggi Mazeh, Karine Atlan, Iddo Z Ben-Dov, Matan Fischer
Context: Pheochromocytomas are hormone secreting tumors of the medulla of the adrenal glands found in 0.1-0.5% of patients with hypertension. The vast majority of pheochromocytomas secrete catecholamines, but they have been occasionally shown to also secrete interleukins, calcitonin, testosterone, and in rare cases adrenocorticotropic hormone. Pheochromocytoma crisis is a life threatening event in which high levels of catecholamines cause a systemic reaction leading to organ failure. Case Description: A 70-year-old man was admitted with acute myocardial ischemia following glucocorticoid administration as part of an endocrine workup for an adrenal mass...
2018: Case Reports in Endocrinology
https://www.readbyqxmd.com/read/29675132/honokiol-ameliorates-myocardial-ischemia-reperfusion-injury-in-type-1-diabetic-rats-by-reducing-oxidative-stress-and-apoptosis-through-activating-the-sirt1-nrf2-signaling-pathway
#4
Bin Zhang, Mengen Zhai, Buying Li, Zhenhua Liu, Kaifeng Li, Liqing Jiang, Meng Zhang, Wei Yi, Jian Yang, Dinghua Yi, Hongliang Liang, Zhenxiao Jin, Weixun Duan, Shiqiang Yu
Reducing oxidative stress is a crucial therapeutic strategy for ameliorating diabetic myocardial ischemia/reperfusion (MI/R) injury. Honokiol (HKL) acts as an effective cardioprotective agent for its strong antioxidative activity. However, its roles and underlying mechanisms against MI/R injury in type 1 diabetes (T1D) remain unknown. Since SIRT1 and Nrf2 are pivotal regulators in diabetes mellitus patients suffering from MI/R injury, we hypothesized that HKL ameliorates diabetic MI/R injury via the SIRT1-Nrf2 signaling pathway...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29674977/serum-derived-extracellular-vesicles-protect-against-acute-myocardial-infarction-by-regulating-mir-21-pdcd4-signaling-pathway
#5
Huanyu Gu, Zhuyuan Liu, Yongqin Li, Yuan Xie, Jianhua Yao, Yujiao Zhu, Jiahong Xu, Qiying Dai, Chongjun Zhong, Hao Zhu, Shengguang Ding, Lei Zhou
Acute myocardial infarction (AMI) represents a leading cause of morbidity and mortality worldwide. Extracellular vesicles (EVs) are being recognized as a promising therapeutic approach in protecting against MI. Serum is a rich source of EVs, which transports various microRNAs (miRNAs, miRs). EVs from serum have been shown beneficial for protecting against ischemia-reperfusion injury; however, their roles in AMI are unclear. In addition, whether a miRNA might be responsible for the effects of serum EVs on protecting against AMI is undetermined...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29674972/gualou-xiebai-decoction-a-traditional-chinese-medicine-prevents-cardiac-reperfusion-injury-of-hyperlipidemia-rat-via-energy-modulation
#6
Lu-Lu Yan, Wei-Yang Zhang, Xiao-Hong Wei, Li Yan, Chun-Shui Pan, Yang Yu, Jing-Yu Fan, Yu-Ying Liu, Hua Zhou, Jing-Yan Han, Xin-Sheng Yao
Background: Gualou Xiebai Decoction (GLXB) is a classic prescription of Chinese medicine used for the treatment of cardiac problems. The present study was designed to explore the effect and mechanism of GLXB on ischemia/reperfusion (I/R) induced disorders in myocardial structure and function, focusing on the regulation of energy metabolism and the RhoA/ROCK pathway. Methods: After hyperlipidemic rat model was established by oral administration of high fat diet, the rats were treated with GLXB for 6 weeks and subjected to 30 min occlusion of the left anterior descending coronary artery (LADCA) followed by 90 min reperfusion to elicit I/R challenge...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29674944/dunye-guanxinning-improves-acute-myocardial-ischemia-reperfusion-injury-by-inhibiting-neutrophil-infiltration-and-caspase-1-activity
#7
Q G Zhang, S R Wang, X M Chen, H N Guo, S Ling, J W Xu
Acute myocardial infarction is the most serious manifestation of cardiovascular disease, and it is a life-threatening condition. Dunye Guanxinning (DG) is a protective traditional Chinese patent herbal medicine with high clinical efficacy and suitable for the treatment of myocardial infarction. However, the mechanism through which it is beneficial is unclear. In this study, we hypothesized that DG improves acute myocardial ischemia-reperfusion injury by inhibiting neutrophil infiltration and caspase-1 activity...
2018: Mediators of Inflammation
https://www.readbyqxmd.com/read/29674140/impaired-ca-2-cycling-of-nonischemic-myocytes-contributes-to-sarcomere-dysfunction-early-after-myocardial-infarction
#8
Annette Kronenbitter, Florian Funk, Katarzyna Hackert, Simone Gorreßen, Dennis Glaser, Peter Boknik, Gereon Poschmann, Kai Stühler, Malgorzata Isić, Martina Krüger, Joachim P Schmitt
Changes in the nonischemic remote myocardium of the heart contribute to left ventricular dysfunction after ischemia and reperfusion (I/R). Understanding the underlying mechanisms early after I/R is crucial to improve the adaptation of the viable myocardium to increased mechanical demands. Here, we investigated the role of myocyte Ca2+ handling in the remote myocardium 24 h after 60 min LAD occlusion. Cardiomyocytes isolated from the basal noninfarct-related parts of wild type mouse hearts demonstrated depressed beat-to-beat Ca2+ handling...
April 16, 2018: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29673511/coronary-sinus-reducer-implantation-for-the-treatment-of-chronic-refractory-angina-a-single-center-experience
#9
Francesco Giannini, Luca Baldetti, Francesco Ponticelli, Neil Ruparelia, Satoru Mitomo, Azeem Latib, Matteo Montorfano, Richard J Jabbour, Andrea Aurelio, Luca Ferri, Antonio Mangieri, Damiano Regazzoli, Marco Ancona, Matteo Pagnesi, Alessia Faccini, Alaide Chieffo, Lorenzo Azzalini, Mauro Carlino, Antonio Colombo
OBJECTIVES: The aim of this study was to assess the safety and efficacy of the Reducer in a real-world cohort of patients presenting with refractory angina. BACKGROUND: The coronary sinus Reducer is a novel device to aid in the management of patients with severe angina symptoms refractory to optimal medical therapy and not amenable to further revascularization. METHODS: Fifty patients with refractory angina and objective evidence of myocardial ischemia who were judged unsuitable for revascularization were treated with coronary sinus Reducer implantation at a single center between March 2015 and August 2016...
April 23, 2018: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29673298/initial-clinical-experience-using-the-low-profile-altura-endograft-system-with-double-d-shaped-proximal-stents-for-endovascular-aneurysm-repair
#10
Dainis Krievins, Albrecht Krämer, Janis Savlovskis, Georgij Oszkinis, E Sebastian Debus, Alexander Oberhuber, Christopher K Zarins
PURPOSE: To report the initial clinical results of endovascular aneurysm repair (EVAR) using the low-profile (14-F) Altura Endograft System, which features a double "D-shaped" stent design with suprarenal fixation and modular iliac components that are deployed from distal to proximal. METHODS: From 2011 to 2015, 90 patients (mean age 72.8±8.3 years; 79 men) with abdominal aortic aneurysm (AAA; mean diameter 53.8±5.7 mm) were treated at 10 clinical sites in 2 prospective, controlled clinical studies using the Altura endograft...
April 1, 2018: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/29672922/myocardial-perfusion-quantification-using-simultaneously-acquired-13-nh-3-ammonia-pet-and-dynamic-contrast-enhanced-mri-in-patients-at-rest-and-stress
#11
Karl P Kunze, Stephan G Nekolla, Christoph Rischpler, Shelley HuaLei Zhang, Carmel Hayes, Nicolas Langwieser, Tareq Ibrahim, Karl-Ludwig Laugwitz, Markus Schwaiger
PURPOSE: Systematic differences with respect to myocardial perfusion quantification exist between DCE-MRI and PET. Using the potential of integrated PET/MRI, this study was conceived to compare perfusion quantification on the basis of simultaneously acquired 13 NH3 -ammonia PET and DCE-MRI data in patients at rest and stress. METHODS: Twenty-nine patients were examined on a 3T PET/MRI scanner. DCE-MRI was implemented in dual-sequence design and additional T1 mapping for signal normalization...
April 19, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29672588/correction-transplantation-of-hgf-gene-engineered-skeletal-myoblasts-improve-infarction-recovery-in-a-rat-myocardial-ischemia-model
#12
Shu-Ling Rong, Xiao-Lin Wang, Cui-Ying Zhang, Zhuo-Hui Song, Lu-Hua Cui, Xiao-Feng He, Xu-Jiong Li, Hui-Jin Du, Bao Li
[This corrects the article DOI: 10.1371/journal.pone.0175807.].
2018: PloS One
https://www.readbyqxmd.com/read/29671538/stable-coronary-artery-disease-treatment
#13
Michael M Braun, William A Stevens, Craig H Barstow
Stable coronary artery disease refers to a reversible supply/demand mismatch related to ischemia, a history of myocardial infarction, or the presence of plaque documented by catheterization or computed tomography angiography. Patients are considered stable if they are asymptomatic or their symptoms are controlled by medications or revascularization. Treatment involves risk factor management, antiplatelet therapy, and antianginal medications. Tobacco cessation, exercise, and weight loss are the most important lifestyle modifications...
March 15, 2018: American Family Physician
https://www.readbyqxmd.com/read/29671237/acute-torrential-mitral-regurgitation-during-transcatheter-aortic-valve-replacement-a-case-report
#14
Yoshiyuki Yamashita, Hiromichi Sonoda, Tomoki Ushijima, Akira Shiose
BACKGROUND: Transcatheter aortic valve replacement (TAVR) is a minimally invasive approach to aortic valve replacement. However, critical cardiovascular collapse can occur during the procedure for various reasons. CASE PRESENTATION: A 90-year-old man with severe aortic stenosis and left circumflex artery stenosis developed acute torrential mitral regurgitation (MR) during TAVR. The valve deployment process induced left ventricular dyssynchrony due to left bundle-branch block and myocardial ischemia in the left circumflex artery region with torrential MR...
April 18, 2018: Surgical Case Reports
https://www.readbyqxmd.com/read/29671020/luteolin-alleviates-cardiac-ischemia-reperfusion-injury-in-the-hypercholesterolemic-rat-via-activating-akt-nrf2-signaling
#15
Jin-Ting Yang, Jue Wang, Xin-Ru Zhou, Chi Xiao, Yang-Yun Lou, Li-Hui Tang, Feng-Jiang Zhang, Ling-Bo Qian
Myocardial ischemia/reperfusion (I/R) injury in hypercholesterolemia is associated with oxidative stress, while luteolin is known to reduce oxidative stress by activating Akt/nuclear factor erythroid-2-related factor 2 (Nrf2) signaling and alleviate cardiac I/R injury. Here, we investigated whether luteolin pretreatment diminishes myocardial I/R injury in hypercholesterolemic rats by activating Akt/Nrf2 signaling. Hypercholesterolemic rats were produced by 2% cholesterol diet for 8 weeks. Luteolin (100 mg/kg/day, i...
April 18, 2018: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29670529/adenosine-receptor-mediated-cardioprotection-current-limitations-and-future-directions
#16
Robert D Lasley
Since the seminal reports of adenosine receptor-mediated cardioprotection in the early 1990s, there have been a multitude of such reports in various species and preparations. Original observations of the beneficial effects of A1 receptor agonists have been followed up with numerous reports also implicating A2A , A3 , and most recently A2B , receptor agonists as cardioprotective agents. Although adenosine has been approved for clinical use in the United States for the treatment of supraventricular tachycardia and coronary artery imaging, and the selective A2A agonist, regadenoson, for the latter, clinical use of adenosine receptor agonists for protecting the ischemic heart has not advanced beyond early trials...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29670333/upregulation-of-vascular-endothelial-growth-factor-receptor-1-contributes-to-sevoflurane-preconditioning-mediated-cardioprotection
#17
Bin Qian, Yang Yang, Yusheng Yao, Yanling Liao, Ying Lin
Purpose: Sevoflurane preconditioning (SPC) can provide myocardial protective effects similar to ischemic preconditioning. However, the exact mechanism of SPC remains unclear. Previous studies indicate that vascular endothelial growth factor receptor 1 (VEGFR-1) is involved in ischemic preconditioning-mediated cardioprotection. This study was designed to determine the significance of VEGFR-1 signaling in SPC-mediated cardioprotection. Materials and methods: Myocardial ischemia-reperfusion (I/R) rat model was established using the Langendorff isolated heart perfusion apparatus...
2018: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/29670247/effects-of-microrna-292-5p-on-myocardial-ischemia-reperfusion-injury-through-the-peroxisome-proliferator-activated-receptor-%C3%AE-%C3%AE-signaling-pathway
#18
Zhen-Dong Zhu, Ji-Yun Ye, Hua Niu, Yu-Mei Ma, Xue-Mei Fu, Zhong-Hua Xia, Xuan Zhang
Ischemia-reperfusion injury (IRI) is a major cause of cardiac damage following various pathological processes, such as free radical damage and cell apoptosis. This study aims to investigate whether microRNA-292-5p (miR-292-5p) protects against myocardial ischemia-reperfusion injury (IRI) via the peroxisome proliferator-activated receptor (PPAR)-α/-γ signaling pathway in myocardial IRI mice models. Mouse models of myocardial IRI were established. Adult male C57BL/6 mice were divided into different groups. The hemodynamic indexes, levels of related inflammatory factors and serum myocardial enzymes, and malondialdehyde (MDA) content and the activity of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were detected...
April 18, 2018: Gene Therapy
https://www.readbyqxmd.com/read/29669712/er-chaperone-grp78-protects-heart-from-ischemia-reperfusion-injury-through-akt-activation
#19
Xukun Bi, Guangyu Zhang, Xiaoding Wang, Chau Yt Nguyen, Herman I May, Xiaoting Li, Ali Al-Hashimi, Richard C Austin, Thomas G Gillette, Guo Sheng Fu, Zhao V Wang, Joseph A Hill
<u>Rationale:</u> Restoration of coronary artery blood flow is the most effective means of ameliorating myocardial damage triggered by ischemic heart disease. However, coronary reperfusion elicits an increment of additional injury to the myocardium. Accumulating evidence indicates that the unfolded protein response (UPR) in cardiomyocytes is activated by ischemia/reperfusion (I/R) injury. Xbp1s, the most highly conserved branch of the UPR, is protective in response to cardiac I/R injury. GRP78, a master regulator of the UPR and an Xbp1s target, is up-regulated after I/R...
April 18, 2018: Circulation Research
https://www.readbyqxmd.com/read/29667581/relation-between-bioresorbable-scaffold-sizing-using-qca-dmax-and-long-term-clinical-outcomes-in-1-232-patients-from-3-study-cohorts-absorb-cohort-b-absorb-extend-and-absorb-ii
#20
Yuki Katagiri, Yoshinobu Onuma, Taku Asano, Ply Chichareon, Carlos Collet, Yosuke Miyazaki, Jan J Piek, Joanna J Wykrzykowska, Alexandre Abizaid, John A Ormiston, Bernard Chevalier, Patrick W Serruys
AIMS: This study sought to investigate the long-term clinical outcomes related to scaffold sizing based on quantitative coronary angiography. METHODS AND RESULTS: A total of 1,248 patients who received Absorb bioresorbable scaffolds in the ABSORB Cohort B, ABSOR EXTEND, ABSORB II trials were included in the analysis. The incidence of MACE (a composite of cardiac death, any myocardial infarction [MI], and ischemia-driven target lesion revascularization [ID-TLR]) was analysed according to the Dmax subclassification of oversized scaffold group versus non-oversized (any undersize) scaffold group...
April 17, 2018: EuroIntervention
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