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https://www.readbyqxmd.com/read/28315943/hyperoxia-reduces-oxygen-consumption-in-children-with-pulmonary-hypertension
#1
Long Guo, Prashant Bobhate, Shine Kumar, Karunakar Vadlamudi, Tarek Kaddoura, Mohamed Elgendi, Paula Holinski, James Y Coe, Jennifer Rutledge, Ian Adatia
High inspired oxygen concentration (FiO2 > 0.85) is administered to test pulmonary vascular reactivity in children with pulmonary hypertension (PH). It is difficult to measure oxygen consumption (VO2) if the subject is breathing a hyperoxic gas mixture so the assumption is made that baseline VO2 does not change. We hypothesized that hyperoxia changes VO2. We sought to compare the VO2 measured by a thermodilution catheter in room air and hyperoxia. A retrospective review of the hemodynamic data obtained in children with PH who underwent cardiac catheterization was conducted between 2009 and 2014...
March 18, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28315488/sorafenib-as-a-potential-strategy-for-refractory-pulmonary-arterial-hypertension
#2
Gou Kimura, Masaharu Kataoka, Takumi Inami, Keiichi Fukuda, Hideaki Yoshino, Toru Satoh
Sorafenib is an inhibitor of multi-kinases including tyrosine and serine/threonine kinases. We investigated the efficacy and safety of sorafenib for the treatment of patients with refractory pulmonary arterial hypertension (PAH). Sorafenib was started in 9 patients (7 with idiopathic PAH, 2 with pulmonary veno-occlusive disease) who had severe PAH and right heart failure, in spite of treatment with vasodilators specific for PAH. Sorafenib was started as an add-on therapy at a dose of 50 or 100 mg/day, and increased to 100-400 mg/day...
March 14, 2017: Pulmonary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28306357/asthma-causes-inflammation-of-human-pulmonary-arteries-and-decreases-vasodilatation-induced-by-prostaglandin-i2-analogs
#3
Nabil Foudi, Aouatef Badi, Mounira Amrane, Wassim Hodroj
OBJECTIVE: Asthma is a chronic inflammatory disease associated with increased cardiovascular events. This study assesses the presence of inflammation and the vascular reactivity of pulmonary arteries in patients with acute asthma. METHODS: Rings of human pulmonary arteries obtained from non-asthmatic and asthmatic patients were set up in organ bath for vascular tone monitoring. Reactivity was induced by vasoconstrictor and vasodilator agents. Protein expression of inflammatory markers was detected by western blot...
February 21, 2017: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/28303667/exercise-induced-saphenous-vein-graft-spasm-prevented-by-stenting
#4
William G Boliek, Dean J Kereiakes, Atul Chugh
Recurrence of anginal symptoms following coronary artery bypass surgery is usually secondary to graft closure or progression of native vessel disease. The present case demonstrates severe exercise-induced saphenous vein graft (SVG) spasm associated with transmural ischemia refractory to maximal vasodilator therapy. Symptoms resolved and exercise electrocardiography normalized following stenting of SVG regions demonstrating spasm. © 2017 Wiley Periodicals, Inc.
March 17, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28303482/extracellular-superoxide-dismutase-is-necessary-to-maintain-renal-blood-flow-during-sepsis-development
#5
Larissa Constantino, Letícia Selinger Galant, Francieli Vuolo, Karla Lorena Guarido, Luiza Wilges Kist, Giovanna Medeiros Tavares de Oliveira, Matheus Augusto de Bittencourt Pasquali, Cláudio Teodoro de Souza, José Eduardo da Silva-Santos, Maurício Reis Bogo, José Cláudio Fonseca Moreira, Cristiane Ritter, Felipe Dal-Pizzol
BACKGROUND: Extracellular superoxide dismutase (ECSOD) protects nitric oxide (NO) bioavailability by decreasing superoxide levels and preventing peroxynitrite generation, which is important in maintaining renal blood flow and in preventing acute kidney injury. However, the profile of ECSOD expression after sepsis is not fully understood. Therefore, we intended to evaluate the content and gene expression of superoxide dismutase (SOD) isoforms in the renal artery and their relation to renal blood flow...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28298790/effect-of-periradial-administration-of-papaverine-on-radial-artery-diameter
#6
P S Nagaraja, Naveen G Singh, N Manjunatha, Rushikesh Chintamanrao Desai
BACKGROUND: Radial artery cannulation is a skillful procedure. An experienced anesthesiologist might also face difficulty in cannulating a feeble radial pulse. AIM: The purpose of the study was to determine whether periradial subcutaneous administration of papaverine results in effective vasodilation and improvement in the palpability score of radial artery. SETTINGS AND DESIGN: Prospective, double-blinded trial. METHODOLOGY: Thirty patients undergoing elective cardiac surgery were enrolled in the study...
January 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28289180/beneficial-effects-of-apelin-on-vascular-function-in-patients-with-central-obesity
#7
Francesca Schinzari, Augusto Veneziani, Nadia Mores, Angela Barini, Nicola Di Daniele, Carmine Cardillo, Manfredi Tesauro
Patients with central obesity have impaired insulin-stimulated vasodilation and increased ET-1 (endothelin 1) vasoconstriction, which may contribute to insulin resistance and vascular damage. Apelin enhances insulin sensitivity and glucose disposal but also acts as a nitric oxide (NO)-dependent vasodilator and a counter-regulator of AT1 (angiotensin [Ang] II type 1) receptor-induced vasoconstriction. We, therefore, examined the effects of exogenous (Pyr(1))apelin on NO-mediated vasodilation and Ang II- or ET-1-dependent vasoconstrictor tone in obese patients...
March 13, 2017: Hypertension
https://www.readbyqxmd.com/read/28287891/associations-of-resting-heart-rate-with-endothelium-dependent-vasodilation-and-shear-rate
#8
Jitanan Laosiripisan, Kristin L Parkhurst, Hirofumi Tanaka
Heart rate is an independent risk factor for cardiovascular disease and a hemodynamic factor that can modulate blood flow as it affects the frequency of shear stimuli acting on the arterial wall. However, the association between heart rate and endothelium-dependent vasodilation remains highly controversial. We determined the association between heart rate at rest and endothelium-dependent vasodilation in 98 apparently healthy adults (18-63 years). The mild and positive association between heart rate and flow-mediated dilation (FMD) was no longer significant when age and sex or baseline diameter were controlled for...
2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28285332/the-role-of-l-arginine-l-homoarginine-nitric-oxide-pathway-for-aortic-distensibility-and-intima-media-thickness-in-stroke-patients
#9
Arash Haghikia, Georgi Radoslavov Yanchev, Arslan Arinc Kayacelebi, Erik Hanff, Nils Bledau, Christian Widera, Kristina Sonnenschein, Aiden Haghikia, Karin Weissenborn, Johann Bauersachs, Udo Bavendiek, Dimitrios Tsikas
Asymmetric dimethylarginine (ADMA) and L-homoarginine (hArg) are L-arginine (Arg) metabolites derived from different pathways. Protein arginine N-methyltransferase (PRMT) and subsequent proteolysis of proteins containing methylarginine residues release ADMA. Arginine:glycine amidinotransferase (AGAT) converts Arg to hArg and guanidinoacetate (GAA). While high concentrations of ADMA and low concentrations of hArg in the blood have been established as cardiovascular risk markers, the cardiovascular relevance of GAA is still unexplored...
March 11, 2017: Amino Acids
https://www.readbyqxmd.com/read/28285136/homocysteine-ameliorates-the-endothelium-independent-hypoxic-vasoconstriction-via-the-suppression-of-phosphatidylinositol-3-kinase-akt-pathway-in-porcine-coronary-arteries
#10
Yuan-Ming An, Han Feng, Xing-Zhong Zhang, Xin Cong, Qian Zhao, Li-Ling Wu, Dou Dou
OBJECTIVE: Endothelium-independent coronary vasoconstriction induced by continuous hypoxia contributes to the development of ischemic heart diseases. Acute elevation of homocysteine (Hcy) has a potent of vasodilation. The present study aims to investigate the role of Hcy in endothelium-independent hypoxic coronary vasoconstriction and its underlying mechanisms. METHODS AND RESULTS: Vessel tension of isolated porcine coronary arteries was measured by organ chamber study and the protein expression were detected by western blot...
March 8, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28284926/moderate-short-term-local-hyperglycemia-attenuates-forearm-endothelium-dependent-vasodilation-after-transient-ischemia-reperfusion-in-human-volunteers
#11
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/28284324/readdressing-the-entity-of-exercise-pulmonary-arterial-hypertension
#12
REVIEW
Boris I Medarov, Sidharth Jogani, Johnathan Sun, Marc A Judson
Exercise pulmonary hypertension (EPH) indicates an abnormally elevated pulmonary artery pressure (PAP) during exercise. The physiological range of PAP during exercise remains poorly defined and, therefore, a universally accepted definition of EPH remains elusive. Nevertheless, previous data concerning the distribution of PAP in normal populations and more recent retrospective clinical data enhanced our ability to define EPH. EPH can impair exercise capacity and cause dyspnea. The underlying pathophysiology of the arterial form of EPH (EPAH) appears to be similar to that seen in resting pulmonary arterial hypertension (PAH), and EPAH individuals are at risk of developing resting PAH...
March 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28282243/differences-in-right-ventricular-functional-changes-during-treatment-between-systemic-sclerosis-associated-pulmonary-arterial-hypertension-and-idiopathic-pulmonary-arterial-hypertension
#13
Rahul G Argula, Abhijit Karwa, Abigail Lauer, David Gregg, Richard M Silver, Carol Feghali-Bostwick, Lynn M Schnapp, Kim Egbert, Bruce W Usher, Viswanathan Ramakrishnan, Paul M Hassoun, Charlie Strange
RATIONALE: Patients with scleroderma associated pulmonary arterial hypertension (SSc-PAH) continue to have an unacceptably high mortality despite the progress achieved with pulmonary arterial vasodilator therapies. OBJECTIVES: We sought to determine whether SSc-PAH is a clinically distinct pulmonary vascular disease phenotype when compared to IPAH, based on the progression of echocardiographic right ventricular (RV) dysfunction. METHODS: Retrospective analysis of echocardiographic data in 13 SSc-PAH and 11 IPAH patients was used to delineate the progression of RV dysfunction during single or combination pulmonary arterial vasodilator therapy...
March 10, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28278256/activation-of-g-protein-coupled-estrogen-receptor-1-induces-coronary-artery-relaxation-via-epac-rap1-mediated-inhibition-of-rhoa-rho-kinase-pathway-in-parallel-with-pka
#14
Xuan Yu, Qiao Zhang, Yan Zhao, Benjamin J Schwarz, John N Stallone, Cristine L Heaps, Guichun Han
Previously, we reported that cAMP/PKA signaling is involved in GPER-mediated coronary relaxation by activating MLCP via inhibition of RhoA pathway. In the current study, we tested the hypothesis that activation of GPER induces coronary artery relaxation via inhibition of RhoA/Rho kinase pathway by cAMP downstream targets, exchange proteins directly activated by cAMP (Epac) as well as PKA. Our results show that Epac inhibitors, brefeldin A (BFA, 50 μM), or ESI-09 (20 μM), or CE3F4 (100 μM), all partially inhibited porcine coronary artery relaxation response to the selective GPER agonist, G-1 (0...
2017: PloS One
https://www.readbyqxmd.com/read/28275061/impaired-sweating-responses-to-a-passive-whole-body-heat-stress-in-individuals-with-multiple-sclerosis
#15
Dustin R Allen, Mu Huang, Iqra M Parupia, Ariana R Dubelko, Elliot M Frohman, Scott L Davis
Multiple sclerosis (MS) is an autoimmune disease that affects the central nervous system (CNS), disrupting autonomic function. The aim of this study was to test the hypothesis that individuals with MS have blunted control of thermoregulatory reflex increases in sweat rate (SR) and cutaneous vasodilation compared to controls during a passive whole-body heat stress (WBH). Eighteen individuals with relapsing-remitting MS and 18 healthy controls (CON) participated in the study. Core temperature (Tcore), skin temperature, heart rate, arterial blood pressure (10 min intervals), skin blood flow (laser-Doppler flux: LDF), and SR were continuously measured during normothermic baseline (34 °C water perfusing a tube-lined suit) and WBH (increased Tcore 0...
March 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28274927/endothelial-dysfunction-correlates-with-exaggerated-exercise-pressor-response-during-whole-body-maximal-exercise-in-chronic-kidney-disease
#16
Ryan M Downey, Peizhou Liao, Erin C Millson, Arshed A Quyyumi, Salman Sher, Jeanie Park
Chronic kidney disease (CKD) patients have exercise intolerance associated with increased cardiovascular mortality. Previous studies demonstrate that blood pressure (BP) and sympathetic nerve responses to handgrip exercise are exaggerated in CKD. These patients also have decreased nitric oxide (NO) bioavailability and endothelial dysfunction which could potentially lead to an impaired ability to vasodilate during exercise. We hypothesized that CKD patients have exaggerated BP responses during maximal whole body exercise and that endothelial dysfunction correlates with greater exercise pressor responses in these patients...
March 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28273891/effects-of-long-term-magnesium-supplementation-on-endothelial-function-and-cardiometabolic-risk-markers-a-randomized-controlled-trial-in-overweight-obese-adults
#17
Peter J Joris, Jogchum Plat, Stephan J L Bakker, Ronald P Mensink
Long-term magnesium supplementation improves arterial stiffness, a cardiovascular disease risk marker. Effects on endothelial function may be another mechanism whereby increased magnesium intakes affect cardiovascular risk. Therefore, a 24-week, randomized, double-blind, placebo-controlled trial was performed to examine effects of magnesium supplementation on endothelial function and cardiometabolic risk markers. Fifty-two overweight and obese subjects (30 men and 22 women, age 62 ± 6 years) were randomized to receive either three times daily magnesium (total dose: 350 mg) or placebo capsules...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28268404/a-temperature-controlled-glove-with-non-invasive-arterial-pulse-sensing-for-active-neuro-vascular-assessment
#18
Andrew M Carek, Omer T Inan
A non-invasive, active neuro-vascular assessment system was developed using a modified temperature-controlled glove and feedback techniques. The glove incorporates local heating and cooling of the hand using multi-point skin temperature measurements as feedback, and thereby induces local and central mechanisms involved in thermoregulation. Electrocardiogram (ECG), photoplethysmogram (PPG) and non-invasive finger-cuff based blood pressure (BP) measurements were used to monitor electrophysiology and hemodynamic changes in response to temperature modulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28266825/cardiovascular-disease-update-pulmonary-hypertension
#19
Johnathan D McDivitt, Craig Barstow
Pulmonary hypertension (PH) is a spectrum disorder with multiple causes of the elevation of pressure in the lungs. It often is difficult to diagnose because it mimics many commonly reported symptoms (eg, dyspnea, exercise intolerance, chest pain). Diagnosis is made via right heart catheterization; however, transthoracic echocardiography may show evidence of elevated pulmonary pressure as the first clue to the diagnosis. Diagnostic tests to consider include a liver panel, complete blood count, and thyroid function test; electrocardiogram; chest x-ray; pulmonary function testing; and possibly lung imaging via computed tomography scan or ventilation-perfusion scan...
March 2017: FP Essentials
https://www.readbyqxmd.com/read/28262007/muscle-oxygen-saturation-increases-during-head-up-tilt-induced-pre-syncope
#20
A Lund, H Sørensen, T W Jensen, M J Niemann, N D Olesen, H B Nielsen, N V Olsen, N H Secher
AIM: To evaluate whether muscle vasodilatation plays a role for hypotension developed during central hypovolaemia, muscle oxygenation (Sm O2 ) was examined during (pre)syncope induced by head-up tilt (HUT). Skin blood flow (SkBF) and oxygenation (Sskin O2 ) were determined because evaluation of Sm O2 may be affected by superficial tissue oxygenation. Furthermore, we evaluated cerebral oxygenation (Sc O2 ) and middle cerebral artery mean blood flow velocity (MCAvmean ). METHODS: Twenty healthy male volunteers (median age 24 years; range 19-38) were subjected to passive 50° HUT for 1 hour or until (pre)syncope...
March 6, 2017: Acta Physiologica
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