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https://www.readbyqxmd.com/read/28333376/regulation-of-coronary-blood-flow
#1
Adam G Goodwill, Gregory M Dick, Alexander M Kiel, Johnathan D Tune
The heart is uniquely responsible for providing its own blood supply through the coronary circulation. Regulation of coronary blood flow is quite complex and, after over 100 years of dedicated research, is understood to be dictated through multiple mechanisms that include extravascular compressive forces (tissue pressure), coronary perfusion pressure, myogenic, local metabolic, endothelial as well as neural and hormonal influences. While each of these determinants can have profound influence over myocardial perfusion, largely through effects on end-effector ion channels, these mechanisms collectively modulate coronary vascular resistance and act to ensure that the myocardial requirements for oxygen and substrates are adequately provided by the coronary circulation...
March 16, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28330969/influence-of-the-coronary-circulation-on-thermal-tolerance-and-cardiac-performance-during-warming-in-rainbow-trout
#2
Andreas Ekström, Michael Axelsson, Albin Gräns, Jeroen Brijs, Erik Sandblom
Thermal tolerance in fish may be related to an oxygen limitation of cardiac function. While the hearts of some fish species receive oxygenated blood via a coronary circulation, the influence of this oxygen supply on thermal tolerance and cardiac performance during warming remain unexplored. Here, we analyzed the effect in vivo of acute warming on coronary blood flow in adult sexually mature rainbow trout (Onchorhynchus mykiss), and the consequences of chronic coronary ligation on cardiac function and thermal tolerance in juvenile trout...
February 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28327605/ginsenoside-rb1-protects-against-ischemia-reperfusion-induced-myocardial-injury-via-energy-metabolism-regulation-mediated-by-rhoa-signaling-pathway
#3
Yuan-Chen Cui, Chun-Shui Pan, Li Yan, Lin Li, Bai-He Hu, Xin Chang, Yu-Ying Liu, Jing-Yu Fan, Kai Sun, Quan -Li, Jing-Yan Han
Cardiac ischemia and reperfusion (I/R) injury remains a challenge for clinicians. Ginsenoside Rb1 (Rb1) has been reported to have the ability to attenuate I/R injury, but its effect on energy metabolism during cardiac I/R and the underlying mechanism remain unknown. In this study, we detected the effect of Rb1 on rat myocardial blood flow, myocardial infarct size, cardiac function, velocity of venule red blood cell, myocardial structure and apoptosis, energy metabolism and change in RhoA signaling pathway during cardiac I/R injury...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28318875/feasibility-of-pet-for-the-management-of-coronary-artery-disease-comparison-between-cfr-and-ffr
#4
REVIEW
Osamu Manabe, Masanao Naya, Nagara Tamaki
Myocardial perfusion imaging using positron emission tomography (PET) allows both qualitative and quantitative measurement. The quantitative myocardial blood flow and coronary flow reserve (CFR) are reliable indices for evaluating functional severity, influenced by both epicardial stenosis and microvascular disease. Fractional flow reserve (FFR) also reflects physiological stenosis, which measures the pressure differences across a coronary artery stenosis during maximum hyperemia. Discordance between CFR and FFR has been noticed in estimating the functional significance of coronary stenosis...
March 16, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28317476/myocardial-infarction-pathological-relevance-and-relationship-with-coronary-risk-factors
#5
Aurelio Leone
BACKGROUND: Three types of necrosis characterize MI: coagulation necrosis, typically due to a coronarogenic mechanism, coagulative myocytolysis with formation of contract bands as an effect of sympathetic nervous system and adrenergic stimulation, and colliquative myocytolysis, characterized by myocardial fiber lysis, which is a close result of hydrolytic enzyme activity deriving from the material reaching the infarct area. METHODS: Although a multifactorial etiology may be identified, nevertheless coronary alterations, which are a consequence of atherosclerotic plaque formation and complications with a reduced blood flow supply to the myocardium, are the benchmark of MI...
March 17, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28317428/fractional-flow-reserve-guided-multivessel-angioplasty-in-myocardial-infarction
#6
Pieter C Smits, Mohamed Abdel-Wahab, Franz-Josef Neumann, Bianca M Boxma-de Klerk, Ketil Lunde, Carl E Schotborgh, Zsolt Piroth, David Horak, Adrian Wlodarczak, Paul J Ong, Rainer Hambrecht, Oskar Angerås, Gert Richardt, Elmir Omerovic
Background In patients with ST-segment elevation myocardial infarction (STEMI), the use of percutaneous coronary intervention (PCI) to restore blood flow in an infarct-related coronary artery improves outcomes. The use of PCI in non-infarct-related coronary arteries remains controversial. Methods We randomly assigned 885 patients with STEMI and multivessel disease who had undergone primary PCI of an infarct-related coronary artery in a 1:2 ratio to undergo complete revascularization of non-infarct-related coronary arteries guided by fractional flow reserve (FFR) (295 patients) or to undergo no revascularization of non-infarct-related coronary arteries (590 patients)...
March 18, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28315571/the-relationship-of-micronucleus-frequency-and-nuclear-division-index-with-coronary-artery-disease-syntax-and-gensini-scores
#7
Emrah İpek, Emrah Ermiş, Handan Uysal, Halit Kızılet, Selami Demirelli, Erkan Yıldırım, Sedat Ünver, Bircan Demir, Nergiz Kızılet
OBJECTIVE: We aimed to evaluate the relationship of micronucleus (MN) frequency and nuclear division index (NDI) with SYNTAX and Gensini scores and thrombolysis in myocardial infarction (TIMI) frame counts of coronary arteries in patients undergoing coronary angiography. METHODS: In a single-center prospective observational study, a total of 63 individuals, 48 consecutive patients with coronary artery disease (CAD) and 15 healthy people were included. Before coronary angiography (exposure to X-ray), blood samples were collected for lymphocyte cultures, MN and NDI measurements...
March 9, 2017: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/28302764/-18-f-gp1-a-novel-fluorine-18-labeled-tracer-designed-for-pet-imaging-of-thrombi-with-high-detection-sensitivity-and-low-background
#8
Jessica Lohrke, Holger Siebeneicher, Markus Berger, Michael Reinhardt, Mathias Berndt, Andre Mueller, Marion Zerna, Norman Koglin, Felix Oden, Marcus Bauser, Matthias Friebe, Ludger M Dinkelborg, Joachim Huetter, Andrew W Stephens
Thromboembolic diseases such as myocardial infarction, stroke, transient ischemic attacks and pulmonary embolism are major causes of morbidity and mortality worldwide. GPIIb/IIIa is the key receptor involved in platelet aggregation and is a validated target for therapeutic approaches and diagnostic imaging. The aim of this study was to develop and characterize a specific small molecule tracer for positron emission tomography (PET) imaging that binds with high affinity to GPIIb/IIIa receptors and has suitable pharmacokinetic properties to overcome limitations of previous approaches...
March 16, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28299608/dissipative-energy-loss-within-the-left-ventricle-detected-by-vector-flow-mapping-in-diabetic-patients-with-controlled-and-uncontrolled-blood-glucose-levels
#9
Chun-Mei Li, Wen-Juan Bai, Yan-Ting Liu, Hong Tang, Li Rao
Diabetes mellitus (DM) is related to increased risks of cardiovascular diseases, such as myocardial infarction, diabetic cardiomyopathy and secondary hypertension. Dissipative energy loss (EL) derived from vector flow mapping (VFM) is thought to reflect the efficiency of blood flow and has been deemed to be an index for the evaluation of left ventricular function. Our study aimed to investigate the value of dissipative EL in diabetic patients with controlled and uncontrolled blood glucose by VFM. Eighty-eight patients with DM and 58 age-matched healthy controls were recruited...
March 15, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28297574/bioactive-lipids-and-circulating-progenitor-cells-in-patients-with-cardiovascular-disease
#10
Salim S Hayek, Yuri Klyachkin, Ahmed Asfour, Nima Ghasemzadeh, Mosaab Awad, Iraj Hesaroieh, Hina Ahmed, Brandon Gray, Jinhee Kim, Edmund K Waller, Arshed A Quyyumi, Ahmed K Abdel-Latif
Bone marrow-derived progenitor cells are mobilized into the peripheral blood after acute myocardial injury and in chronic ischemic heart disease. However, the mechanisms responsible for this mobilization are poorly understood. We examined the relationship between plasma levels of bioactive lipids and number of circulating progenitor cells (CPCs) in patients (N = 437) undergoing elective or emergent cardiac catheterization. Plasma levels of sphingosine-1 phosphate (S1P) and ceramide-1 phosphate (C1P) were quantified using mass spectrometry...
March 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28295341/exercise-training-reverses-age-induced-diastolic-dysfunction-and-restores-coronary-microvascular-function
#11
Kazuki Hotta, Bei Chen, Bradley J Behnke, Payal Ghosh, John N Stabley, Jeremy A Bramy, Jaime L Sepulveda, Michael D Delp, Judy M Muller-Delp
The risk for diastolic dysfunction increases with advancing age. Regular exercise training ameliorates age-related diastolic dysfunction; however, the underlying mechanisms have not been identified. We investigated whether 1) microvascular dysfunction contributes to the development of age-related diastolic dysfunction, and 2) initiation of late-life exercise training reverses age-related diastolic and microvascular dysfunction. Young and old rats underwent 10 weeks of exercise training or remained as sedentary, cage-controls...
March 10, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28293706/coronary-atherosclerotic-burden-vs-coronary-vascular-function-in-diabetic-and-nondiabetic-patients-with-normal-myocardial-perfusion-a-propensity-score-analysis
#12
Roberta Assante, Wanda Acampa, Emilia Zampella, Parthiban Arumugam, Carmela Nappi, Valeria Gaudieri, Mariarosaria Panico, Mario Magliulo, Christine M Tonge, Mario Petretta, Alberto Cuocolo
PURPOSE: To assess the relationship between coronary atherosclerotic burden and vascular function in diabetic and nondiabetic patients after balancing for coronary risk factors. METHODS: We studied 672 patients without overt coronary artery disease and normal myocardial perfusion on stress (82)Rb PET/CT imaging. To account for differences in baseline characteristics between diabetic patients and nondiabetic patients, we created a propensity score-matched cohort considering clinical variables and coronary risk factors...
March 14, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28293274/optimally-repeatable-kinetic-model-variant-for-myocardial-blood-flow-measurements-with-82-rb-pet
#13
Adrian F Ocneanu, Robert A deKemp, Jennifer M Renaud, Andy Adler, Rob S B Beanlands, Ran Klein
Purpose. Myocardial blood flow (MBF) quantification with (82)Rb positron emission tomography (PET) is gaining clinical adoption, but improvements in precision are desired. This study aims to identify analysis variants producing the most repeatable MBF measures. Methods. 12 volunteers underwent same-day test-retest rest and dipyridamole stress imaging with dynamic (82)Rb PET, from which MBF was quantified using 1-tissue-compartment kinetic model variants: (1) blood-pool versus uptake region sampled input function (Blood/Uptake-ROI), (2) dual spillover correction (SOC-On/Off), (3) right blood correction (RBC-On/Off), (4) arterial blood transit delay (Delay-On/Off), and (5) distribution volume (DV) constraint (Global/Regional-DV)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28290869/-the-importance-of-perfusion-assessment-for-determination-of-functional-sufficiency-of-myocardium
#14
V E Milyukov, T S Zharikova
Myocardial vascular bed is represented by a network of arterial and venous vessels as well as microcirculatory vessels including arterioles, precapillaries, capillaries, postcapillaries, venules, and arteriolo-venular anastomoses. Myocardial capillaries are an exchange link providing perfusion of the myocardium with nutrients therefore sufficiency of the capillary circulation ensures the adequacy of metabolic processes in the cells of the heart muscle. There is no consensus among physicians of various specialties on the methodology of assessing coronary blood flow and blood supply to the myocardial tissue...
September 2016: Kardiologiia
https://www.readbyqxmd.com/read/28284926/moderate-short-term-local-hyperglycemia-attenuates-forearm-endothelium-dependent-vasodilation-after-transient-ischemia-reperfusion-in-human-volunteers
#15
Thomas J Ebert, Jutta Novalija, Jill A Barney, Toni D Uhrich, Shahbaz R Arain, Julie K Freed, Paul S Pagel
OBJECTIVE: Acute hyperglycemia causes endothelial dysfunction in diabetic patients, abolishes ischemic pre- and postconditioning, and is an independent predictor of adverse outcome after myocardial infarction in nondiabetic patients. Its effects on endothelial-dependent vasodilation are controversial in healthy subjects. The authors studied the effect of moderate short-term local hyperglycemia on forearm endothelium-dependent vasodilation in healthy volunteers. DESIGN: Randomized, crossover, blinded, 2-visit, pilot design...
December 2, 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28281270/liposome-enhanced-lateral-flow-assays-for-clinical-analyses
#16
Katie A Edwards, Ricki Korff, Antje J Baeumner
Clinical and environmental analyses frequently necessitate rapid, simple, and inexpensive point-of-care or field tests. These semiquantitative tests may be later followed up by confirmatory laboratory-based assays, but provide an initial scenario assessment important for resource mobilization and threat confinement. Lateral-flow assays (LFAs) and dip-stick assays, which are typically antibody-based and yield a visually detectable signal, provide an assay format suiting these applications extremely well. Signal generation is commonly obtained through the use of colloidal gold or latex beads, which yield a colored band either directly proportional or inversely proportional to the concentration of the analyte of interest...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28281238/practical-considerations-of-fractional-flow-reserve-utilization-to-guide-revascularization
#17
REVIEW
Tara Shah, Joshua D Geleris, Joshua Schulman-Marcus, Dmitriy N Feldman, Rajesh V Swaminathan
Invasive angiography has long been the gold standard for the diagnosis of obstructive coronary artery disease (CAD). However, the relationship between angiographic measures of stenosis and coronary blood flow is complex, and there is frequent discordance between the visual assessment of a stenotic lesion and its effect on myocardial perfusion. Fractional flow reserve is a rapidly emerging invasive means of assessing the physiologic significance of an epicardial stenosis. This review provides a pragmatic understanding of the physiologic principles that guide fractional flow reserve (FFR), sheds light on its nuances, and explores the most landmark investigations...
February 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28275592/model-of-human-fetal-growth-in-hypoplastic-left-heart-syndrome-reduced-ventricular-growth-due-to-decreased-ventricular-filling-and-altered-shape
#18
Sukriti Dewan, Adarsh Krishnamurthy, Devleena Kole, Giulia Conca, Roy Kerckhoffs, Michael D Puchalski, Jeffrey H Omens, Heather Sun, Vishal Nigam, Andrew D McCulloch
INTRODUCTION: Hypoplastic left heart syndrome (HLHS) is a congenital condition with an underdeveloped left ventricle (LV) that provides inadequate systemic blood flow postnatally. The development of HLHS is postulated to be due to altered biomechanical stimuli during gestation. Predicting LV size at birth using mid-gestation fetal echocardiography is a clinical challenge critical to prognostic counseling. HYPOTHESIS: We hypothesized that decreased ventricular filling in utero due to mitral stenosis may reduce LV growth in the fetal heart via mechanical growth signaling...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28270281/application-of-the-low-dose-one-stop-shop-cardiac-ct-protocol-with-third-generation-dual-source-ct
#19
Lu Lin, Yining Wang, Yan Yi, Jian Cao, Lingyan Kong, Hao Qian, Hongzhi Zhang, Wei Wu, Yun Wang, Zhengyu Jin
Objective To evaluate the feasibility of a low-dose one-stop-shop cardiac CT imaging protocol with third-generation dual-source CT (DSCT). Methods Totally 23 coronary artery disease (CAD) patients were prospectively enrolled between March to September in 2016. All patients underwent an ATP stress dynamic myocardial perfusion imaging (MPI) (data acquired prospectively ECG-triggered during end systole by table shuttle mode in 32 seconds) at 70 kV combined with prospectively ECG-triggered high-pitch coronary artery angiography (CCTA) on a third-generation DSCT system...
February 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/28267256/shear-sensitive-nanocapsule-drug-release-for-site-specific-inhibition-of-occlusive-thrombus-formation
#20
Christopher P Molloy, Yu Yao, Helene Kammoun, Thomas Bonnard, Thomas Hoefer, Karen Alt, Francisco Tovar-Lopez, Gary Rosengarten, Paul A Ramsland, Andries D van der Meer, Albert van den Berg, Andrew J Murphy, Christoph E Hagemeyer, Karlheinz Peter, Erik Westein
BACKGROUND: Myocardial infarction and stroke remain the leading causes of mortality and morbidity. The major limitation of current antiplatelet therapy is that their effective concentrations are limited due to bleeding complications. Targeted delivery of antiplatelet drug to sites of thrombosis would overcome these limitations. OBJECTIVES: Here, we have exploited a key biomechanical feature specific to thrombosis; significantly increased blood shear stress due to a reduction in the lumen of the vessel, to achieve site directed delivery of the clinically used antiplatelet agent eptifibatide using shear-sensitive phosphatidylcholine based nanocapsules...
March 7, 2017: Journal of Thrombosis and Haemostasis: JTH
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