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Myocardial ischemia

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https://www.readbyqxmd.com/read/29241161/troxerutin-protects-against-myocardial-ischemia-reperfusion-injury-via-pi3k-akt-pathway-in-rats
#1
Liliang Shu, Wanzhe Zhang, Chen Huang, Gongcheng Huang, Gang Su
BACKGROUND/AIMS: Troxerutin, also known as vitamin P4, has been commonly used in the treatment of chronic venous insufficiency (CVI) disease. However, its effect on in vivo myocardial ischemia/reperfusion (I/R) injury, a model that closely mimics acute myocardial infarction in humans, is still unknown. METHODS: The myocardial I/R injury rat model was created with troxerutin preconditioning. Myocardial infarct size was evaluated by the Evans blue-TTC method. Hemodynamic parameters, including the heart rate (HR), left ventricular end-diastolic pressure (LVEDP), left ventricular systolic pressure (LVSP), maximal rate of rise in blood pressure in the ventricular chamber (+dp/dt max), and maximal rate of decline in blood pressure in the ventricular chamber (-dp/dt max) were monitored...
December 8, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29240450/letter-in-response-to-tp-e-interval-and-tp-e-qt-ratio-before-and-after-catheter-ablation-in-patients-with-premature-ventricular-complexes
#2
Ahmet Korkmaz, Deniz Sahin, Umit Guray
AIM: Recently fragmented QRS (fQRS) on ECG has been introduced as a predictor of myocardial scarring and myocardial ischemia in coronary artery disease. OBJECTIVE: The aim of this study was to investigate the relationship between fQRS and fractional flow reserve (FFR) results in patients with the intermediate degree of coronary artery stenosis. METHODS: A total of 301 consecutive patients who underwent coronary angiography and FFR measurement for intermediate coronary artery stenosis were included in the study...
December 14, 2017: Biomarkers in Medicine
https://www.readbyqxmd.com/read/29239839/the-formin-diaph1-is-a-key-modulator-of-myocardial-ischemia-reperfusion-injury
#3
Karen M O'Shea, Radha Ananthakrishnan, Qing Li, Nosirudeen Quadri, Devi Thiagarajan, Gopalkrishna Sreejit, Lingjie Wang, Hylde Zirpoli, Juan Francisco Aranda, Arthur S Alberts, Ann Marie Schmidt, Ravichandran Ramasamy
The biochemical, ionic, and signaling changes that occur within cardiomyocytes subjected to ischemia are exacerbated by reperfusion; however, the precise mechanisms mediating myocardial ischemia/reperfusion (I/R) injury have not been fully elucidated. The receptor for advanced glycation end-products (RAGE) regulates the cellular response to cardiac tissue damage in I/R, an effect potentially mediated by the binding of the RAGE cytoplasmic domain to the diaphanous-related formin, DIAPH1. The aim of this study was to investigate the role of DIAPH1 in the physiological response to experimental myocardial I/R in mice...
November 21, 2017: EBioMedicine
https://www.readbyqxmd.com/read/29239459/ischemic-left-ventricle-systolic-dysfunction-an-evidence-based-approach-in-diagnostic-tools-and-therapeutics
#4
Eduardo Gomes Lima, Felipe Pereira Câmara de Carvalho, Jaime Paula Pessoa Linhares Filho, Fabio Grunspun Pitta, Carlos Vicente Serrano
Coronary artery disease (CAD) associated with left ventricular systolic dysfunction is a condition related to poor prognosis. There is a lack of robust evidence in many aspects related to this condition, from definition to treatment. Ischemic cardiomyopathy is a spectrum ranging from stunned myocardium associated with myocardial fibrosis to hibernating myocardium and repetitive episodes of ischemia. In clinical practice, relevance lies in identifying the myocardium that has the ability to recover its contractile reserve after revascularization...
September 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/29239349/influences-of-ivabradine-treatment-on-serum-levels-of-cardiac-biomarkers-sst2-gdf-15-supar-and-h-fabp-in-patients-with-chronic-heart-failure
#5
Peter Jirak, Dzeneta Fejzic, Vera Paar, Bernhard Wernly, Rudin Pistulli, Ilonka Rohm, Christian Jung, Uta C Hoppe, P Christian Schulze, Michael Lichtenauer, Atilla Yilmaz, Daniel Kretzschmar
Chronic heart failure (CHF) represents a major cause of hospitalization and death. Recent evidence shows that novel biomarkers such as soluble suppression of tumorigenicity (sST2), growth-differentiation factor-15 (GDF-15), soluble urokinase plasminogen activator receptor (suPAR) and heart-type fatty acid binding protein (H-FABP) are correlated with inflammatory and ischemic responses in CHF patients. In this study we examined the effects of Ivabradine that inhibited the hyperpolarization-activated cyclic nucleotide-gated channel (HCN channel, also called funny current If), thereby leading to selective heart rate reduction and improved myocardial oxygen supply on the cardiac biomarkers sST2, GDF-15, suPAR and H-FABP in 50 CHF patients at the University Hospital of Jena...
December 14, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/29238305/mir-29a-suppresses-spermatogenic-cell-apoptosis-in-testicular-ischemia-reperfusion-injury-by-targeting-trpv4-channels
#6
Jin-Zhuo Ning, Wei Li, Fan Cheng, Wei-Min Yu, Ting Rao, Yuan Ruan, Run Yuan, Xiao-Bin Zhang, Dong Zhuo, Yang Du, Cheng-Cheng Xiao
Background: MicroRNAs (miRNAs) have emerged as gene expression regulators in the progression of ischemia-reperfusion injury (IRI). Accumulating evidences have indicated miR-29a play roles in myocardial and cerebral IRI. However, the role of miR-29a in testicular IRI has not been elucidated. Methods: Changes in expression of miR-29a and Transient Receptor Potential Vanilloid 4 (TRPV4) in animal samples and GC-1 spermatogenic cells were examined. The effects of miR-29a on spermatogenic cell apoptosis in testicular IRI were analyzed both in vitro and in vivo...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29237455/molecular-and-histological-effects-of-mr-guided-pulsed-focused-ultrasound-to-the-rat-heart
#7
Kee W Jang, Tsang-Wei Tu, Matthew E Nagle, Bobbi K Lewis, Scott R Burks, Joseph A Frank
BACKGROUND: Image-guided high intensity focused ultrasound has been used as an extracorporeal cardiac pacing tool and to enhance homing of stem cells to targeted tissues. However, molecular changes in the myocardium after sonication have not been widely investigated. Magnetic-resonance (MR)-guided pulsed focused ultrasound (pFUS) was targeted to the rat myocardium over a range of pressures and the microenvironmental and histological effects were evaluated over time. METHODS: Eight-to-ten-week-old Sprague-Dawley rats received T2-weighted MR images to target pFUS to the left ventricular and septum without cardiac or respiratory gating...
December 13, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29237162/st-depression-no-st-change-or-st-elevation-in-inferior-derivations-which-has-the-worst-outcomes-in-acute-anterior-myocardial-infarction
#8
Mert İlker Hayıroğlu, Ahmet Okan Uzun, Ceyhan Türkkan, Muhammed Keskin, Edibe Betül Börklü, Ahmet İlker Tekkesin, Ömer Kozan
OBJECTIVE: The combination of electrical phenomena and remote myocardial ischemia is the pathophysiological mechanism of ST segment changes in inferior leads in acute anterior myocardial infarction (MI). We investigated the prognostic value of ST segment changes in inferior derivations in patients with first acute anterior MI treated with primary percutaneous coronary intervention (PCI). METHODS: In this prospective single-center analysis, we evaluated the prognostic impact of ST segment changes in inferior derivations on 354 patients with acute anterior MI...
December 14, 2017: Cardiology
https://www.readbyqxmd.com/read/29236912/cardiorespiratory-performance-of-coronary-artery-disease-patients-on-land-versus-underwater-treadmill-tests-a-comparative-study
#9
Mauricio Koprowski Garcia, Limanara Rizzo, Paulo Yazbek-Júnior, Daniela Yutiyama, Fabiola Jomar da Silva, Denise Matheus, Luiz Eduardo Mastrocolla, Eduardo Massad
OBJECTIVE: To compare responses to a cardiopulmonary exercise test on land versus on an underwater treadmill, to assess the cardiorespiratory performance of coronary artery disease patients while immersed in warm water and to compare with the performance of healthy individuals. METHODS: The sample population consisted of 40 subjects, which included 20 coronary artery disease patients aged 63.7±8.89 years old, functional class I and II, according to the New York Hearth Association, and 20 healthy subjects aged 64...
November 2017: Clinics
https://www.readbyqxmd.com/read/29236801/effect-of-atenolol-pre-treatment-in-heart-damage-in-a-model-of-intestinal-ischemia-reperfusion
#10
Mieko Okada, Luiz Fernando Reis Falcão, David Ferez, José Luiz Martins, Paolo Ruggero Errante, Francisco Sandro Menezes Rodrigues, Afonso Caricati-Neto, Márcia Marinho, Guilherme Fenelon, Itamar Souza
PURPOSE: To investigate the effects of atenolol in inflammatory mediator and oxidative stress in a myocardial injury by intestinal ischemia/reperfusion in rat model. METHODS: Adult Wistar male rats were randomly (n=8), anesthetized and divided in: Sham: submitted to operation only; group SS+IR: intravenous saline infusion following superior mesenteric artery occlusion during 60 minutes (ischemia) and open for 120 minutes (reperfusion); group AT+IR: intravenous atenolol infusion (2 mg/kg) following superior mesenteric artery occlusion during 60 minutes (ischemia) and open for 120 minutes (reperfusion); and group AT+I+AT+R: intravenous atenolol infusion following superior mesenteric artery occlusion during 60 minutes (ischemia) and in the time 45 minutes other atenolol doses were administrated and the artery was open for 120 minutes (reperfusion), all animals were submitted to muscular relaxation for mechanical ventilation...
November 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/29236774/ephrina1-fc-attenuates-myocardial-ischemia-reperfusion-injury-in-mice
#11
Augustin DuSablon, Justin Parks, K'Shylah Whitehurst, Heather Estes, Robert Chase, Eleftherios Vlahos, Uma Sharma, David Wert, Jitka Virag
EphrinA1, a membrane-bound receptor tyrosine kinase ligand expressed in healthy cardiomyocytes, is lost in injured cells following myocardial infarction. Previously, we have reported that a single intramyocardial injection of chimeric ephrinA1-Fc at the time of ischemia reduced injury in the nonreperfused myocardium by 50% at 4 days post-MI by reducing apoptosis and inflammatory cell infiltration. In a clinically relevant model of acute ischemia (30min)/reperfusion (24hr or 4 days) injury, we now demonstrate that ephrinA1-Fc reduces infarct size by 46% and completely preserves cardiac function (ejection fraction, fractional shortening, and chamber dimensions) in the short-term (24hrs post-MI) as well as long-term (4 days)...
2017: PloS One
https://www.readbyqxmd.com/read/29236198/sdf-1-induces-tnf-mediated-apoptosis-in-cardiac-myocytes
#12
Andrew A Jarrah, Martina Schwarskopf, Edward R Wang, Thomas LaRocca, Ashwini Dhume, Shihong Zhang, Lahouria Hadri, Roger J Hajjar, Alison D Schecter, Sima T Tarzami
Chemokines are small secreted proteins with chemoattractant properties that play a key role in inflammation. One such chemokine, Stromal cell-derived factor-1 (SDF-1) also known as CXCL12, and its receptor, CXCR4, are expressed and functional in cardiac myocytes. SDF-1 both stimulates and enhances the cellular signal which attracts potentially beneficial stem cells for tissue repair within the ischemic heart. Paradoxically however, this chemokine is known to act in concert with the inflammatory cytokines of the innate immune response which contributes to cellular injury through the recruitment of inflammatory cells during ischemia...
December 13, 2017: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/29231479/-effects-of-electroacupuncture-preconditioning-on-expression-of-aquaporin-1-and-activity-of-protein-kinase-c-in-myocardium-of-rats-with-acute-myocardial-ischemia-reperfusion-injury
#13
Ronglin Cai, Ling Hu, Guoming Shen, Qing Yu, Jie Wang, Zijian Wu, Meng Li
OBJECTIVE: To explore the partial action mechanism and the myocardial protective effect differences between electroacupuncture (EA) preconditioning at "Neiguan"(PC 6) and "Taiyuan"(LU 9) in rats with acute myocardial ischemia-reperfusion injury. METHODS: Ninety-six Wistar rats were randomly assigned into a sham-operation group, a model group, a Neiguan group and a Taiyuan group, 24 rats in each one. The rats in the Neiguan group and Taiyuan group were treated with EA (2 Hz in frequency, 1 mA in intensity) at "Neiguan" (PC 6) and "Taiyuan" (LU 9) respectively, 20 min per treatment, once a day for consecutive 7 days...
February 12, 2017: Zhongguo Zhen Jiu, Chinese Acupuncture & Moxibustion
https://www.readbyqxmd.com/read/29231436/-protective-effect-of-acupuncture-preconditioning-on-oxidative-stress-injury-induced-by-myocardial-ischemia-reperfusion-injury-in-rats
#14
Minglu Shao, Yang Li, Huafeng Cui, Man Jiang, Qiwen Tan
OBJECTIVE: To observe the protective effect of acupuncture preconditioning at "Jiaji" (EX-B 2) on acute myocardial ischemia-reperfusion injury (MIRI) in the rats and explore the mechanism. METHODS: Fifty Wistar rats were randomly divided into a control group, a model group, a Jiaji group, a Neiguan group and a Quchi group, 10 rats in each one. In the Jiaji group, the Neiguan group and the Quchi group, electroacupuncture was given for preconditioning at "Jiaji" T4~T5 (EX-B 2), "Neiguan" (PC 6) and "Quchi" (LI 11) for 7 days before modeling...
March 12, 2017: Zhongguo Zhen Jiu, Chinese Acupuncture & Moxibustion
https://www.readbyqxmd.com/read/29231001/-metabolic-characteristics-of-lethal-bradycardia-induced-by-myocardial-ischemia
#15
J Y Wu, D Wang, J Kong, X X Wang, X J Yu
OBJECTIVES: To explore the metabolic characteristics of lethal bradycardia induced by myocardial ischemia in rat's serum. METHODS: A rat myocardial ischemia-bradycardia-sudden cardiac death (MI-B-SCD) model was established, which was compared with the sham-operation group. The metabolic profile of postmortem serum was analyzed by gas chromatography-mass spectrometry (GC-MS), coupled with the analysis of serum metabolic characteristics using metabolomics strategies...
February 2017: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29230983/-the-changes-of-hif-1%C3%AE-and-vegf-a-in-myocardial-tissue-of-rats-with-arrhythmias
#16
Y Zhang, Z P Cao, R M Mao, Z B Du, L Mi, X Y Luo, M H Tian, B L Zhu
OBJECTIVES: To observe the expression changes of hypoxia inducible factor-1α(HIF-1α) and vascular endothelial growth factor-A (VEGF-A) in rats with arrhythmias, and to explore the differences of the expression pattern in the two indicators of acute myocardial ischemia caused by arrhythmias and coronary insufficiency. METHODS: The arrhythmia was induced by CaCl₂, and the expression changes of HIF-1α and VEGF-A were detected by immunohistochemistry, Western blotting and real-time PCR within 6 h after the arrhythmia in rats...
June 2017: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29230571/correlation-of-left-ventricular-dyssynchrony-on-gated-myocardial-perfusion-spect-analysis-with-extent-of-late-gadolinium-enhancement-on-cardiac-magnetic-resonance-imaging-in-hypertrophic-cardiomyopathy
#17
Hideaki Yuki, Daisuke Utsunomiya, Shinya Shiraishi, Seiji Takashio, Fumi Sakamoto, Noriko Tsuda, Seitaro Oda, Masafumi Kidoh, Takeshi Nakaura, Kenichi Tsujita, Yasuyuki Yamashita
Myocardial perfusion-single-photon emission computed tomography (MP-SPECT) is used to evaluate microvascular dysfunction and coexisting coronary artery disease in patients with hypertrophic cardiomyopathy (HCM). Phase analysis in gated MP-SPECT can provide additional information on left ventricular (LV) dyssynchrony, while the extent of late gadolinium enhancement (LGE) on cardiac magnetic resonance (CMR) imaging is an important prognostic factor in patients with HCM. We, therefore, sought to investigate the relationship of dyssynchrony by phase analysis on gated MP-SPECT and LGE on CMR imaging in 22 patients with HCM who underwent both stress/rest-gated MP-SPECT and contrast-enhanced CMR imaging...
December 11, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/29230180/immediate-early-vs-delayed-invasive-strategy-for-patients-with-non-st-segment-elevation-acute-coronary-syndromes-a-systematic-review-and-meta-analysis
#18
REVIEW
Yanda Li, Zhenpeng Zhang, Xingjiang Xiong, William C Cho, Dan Hu, Yonghong Gao, Hongcai Shang, Yanwei Xing
Invasive coronary revascularization has been shown to improve prognoses in patients with non-ST-segment elevation acute coronary syndromes (NSTE-ACS), but the optimal timing of intervention remains unclear. This meta-analysis is to evaluate the outcomes in immediate (<2 h), early (<24 h), and delayed invasive group and find out which is the optimal timing of intervention in NSTE-ACS patients. Studies were identified through electronic literature search of Medline, PubMed Central, Embase, the Cochrane Library, and CNKI...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29229895/prevalence-and-predictors-of-myocardial-ischemia-by-preoperative-myocardial-perfusion-single-photon-emission-computedtomography-in-patients-undergoing-noncardiac-surgery
#19
Abdelkareem Saleh Al-Oweidi, Hesham Albabtain, Suleiman M Kharabsheh, Peter Kimme, Mahmoud Almustafa, Samer Seder, Mohamed Shoukri, Ahmed L Fathala
BACKGROUND: The prevalence and predictors of myocardial ischemia before noncardiac surgery are unknown. In addition the predictive value of myocardial perfusion single-photon emission computed tomography (SPECT) before noncardiac in individual patients is uncertain. OBJECTIVE: Evaluate the prevalence and predictors of myocardial ischemia before noncardiac surgery, and determine the postoperative cardiac outcome based on results of myocardial perfusion SPECT. DESIGN: Retrospective...
November 2017: Annals of Saudi Medicine
https://www.readbyqxmd.com/read/29229647/tab1-induced-auto-activation-of-p38%C3%AE-mitogen-activated-protein-kinase-is-crucially-dependent-on-threonine-185
#20
Dibesh Thapa, Charlie Nichols, Rekha Bassi, Eva Denise Martin, Shawari Verma, Maria R Conte, Vittorio De Santis, Gian F De Nicola, Michael S Marber
p38α mitogen-activated protein kinase is essential to cellular homeostasis. Two principal mechanisms exist to activate p38α. The first, relies on dedicated dual specificity kinases such as MAP2K3 (MKK3) or MAP2K6 (MKK6), which activate p38α by phosphorylating Thr180 and Tyr182 within the activation segment. The second, is by autophosphorylation of Thr180 and Tyr182 in cis; mediated by p38α binding the scaffold protein TAB1. The second mechanism occurs during myocardial ischemia, where it aggravates myocardial infarction...
December 11, 2017: Molecular and Cellular Biology
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