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https://www.readbyqxmd.com/read/28729387/leg-blood-flow-is-impaired-during-small-muscle-mass-exercise-in-copd-patients
#1
Ulrik Winning Iepsen, Gregers Druedal Wibe Munch, Mette Rugbjerg, Camilla Koch Ryrsø, Niels Secher, Ylva Hellsten, Peter Lange, Bente Klarlund Pedersen, Pia Thaning, Stefan P Mortensen
Skeletal muscle blood flow is regulated to match the oxygen demand and dysregulation could contribute to exercise intolerance in patients with COPD. We measured leg hemodynamics and metabolites from vasoactive compounds in muscle interstitial fluid and plasma at rest, during one-legged knee-extensor exercise, and during arterial infusions of sodium nitroprusside (SNP) and acetylcholine (ACh), respectively. Ten patients with moderate to severe COPD and eight age- and sex matched healthy controls were studied...
July 20, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28729141/effects-of-transjugular-intrahepatic-portosystemic-shunt-tips-on-blood-volume-distribution-in-patients-with-cirrhosis
#2
Troels M Busk, Flemming Bendtsen, Jens H Henriksen, Stefan Fuglsang, Jens O Clemmesen, Fin S Larsen, Søren Møller
BACKGROUND: Cirrhosis is accompanied by portal hypertension with splanchnic and systemic arterial vasodilation, and central hypovolaemia. A transjugular intrahepatic portosystemic shunt (TIPS) alleviates portal hypertension, but also causes major haemodynamic changes. AIMS: To investigate effects of TIPS on regional blood volume distribution, and systemic haemodynamics. METHODS: Thirteen cirrhotic patients had their regional blood volume distribution determined with gamma-camera technique before and after TIPS...
June 27, 2017: Digestive and Liver Disease
https://www.readbyqxmd.com/read/28726518/differential-responses-of-mesenteric-arterial-bed-to-vasoactive-substances-in-l-name-induced-preeclampsia-role-of-oxidative-stress-and-endothelial-dysfunction
#3
Taline A S Amaral, Dayane T Ognibene, Lenize C R M Carvalho, Ana Paula M Rocha, Cristiane A Costa, Roberto S Moura, Angela C Resende
To investigate the systemic and placental oxidant status as well as vascular function in experimental preeclampsia (PE) induced by nitro-L-arginine methyl ester (L-NAME). Fetal parameters and maternal blood pressure, proteinuria, mesenteric arterial bed (MAB) reactivity, and systemic and placental oxidative stress were compared between four groups: pregnant rats receiving L-NAME (60 mg/kg/day, orally) (P + L-NAME) or vehicle (P) from days 13 to 20 of pregnancy and nonpregnant rats receiving L-NAME (NP + L-NAME) or vehicle (NP) during 7 days...
July 20, 2017: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/28721160/genetic-disruption-of-multidrug-resistance-associated-protein-1-improves-endothelial-function-and-attenuates-atherosclerosis-in-mrp1-ldlr-double-knockout-mice
#4
Julian Jehle, Cornelius F H Müller, Adem Aksoy, Sebastian Zimmer, Georg Nickenig, Vedat Tiyerili
INTRODUCTION: Multidrug resistance-associated protein 1 (MRP1) is an anion transporter which is implicated in the efflux of the intracellular antioxidant anion glutathione as well as leukotrienes. Pharmacological inhibition of MRP1 exhibits antioxidative and anti-atherosclerotic effects both in vitro and in vivo. However, pharmacological inhibitors of MRP1 lack selectivity, which prompted us to study the in vivo impact of a genetic disruption of MRP1 on endothelial dysfunction, reactive oxygen species formation and atherogenesis in an atherosclerotic mouse model...
June 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28717881/a-retrospective-comparison-of-inhaled-milrinone-and-iloprost-in-post-bypass-pulmonary-hypertension
#5
Kassiani Theodoraki, Apostolos Thanopoulos, Panagiota Rellia, Evangelos Leontiadis, Dimitrios Zarkalis, Konstantinos Perreas, Theophani Antoniou
During cardiac operations, weaning from cardiopulmonary bypass (CPB) may prove challenging as a result of superimposed acute right ventricular dysfunction in the setting of elevated pulmonary vascular resistance (PVR). The aim of this study was to retrospectively evaluate the effect of inhaled milrinone versus inhaled iloprost in patients with persistent pulmonary hypertension following discontinuation of CPB. Eighteen patients with elevated PVR post-bypass were administered inhaled milrinone at a cumulative dose of 50 μg kg(-1)...
July 17, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28716990/proof-of-principle-for-a-novel-class-of-antihypertensives-that-target-the-oxidative-activation-of-protein-kinase-g-i%C3%AE
#6
Joseph R Burgoyne, Oleksandra Prysyazhna, Daniel A Richards, Philip Eaton
Arterial hypertension continues to be a major health burden. Development of new antihypertensive drugs that engage vasodilatory mechanisms not harnessed by available therapies offer therapeutic potential. Oxidants induce an interprotein disulfide in protein kinase G Iα (PKG Iα) at C42, which is associated with its targeting and activation, resulting in vasodilation and blood pressure lowering. Consequently, we developed an assay and screened for electrophilic drugs that activate PKG Iα by selectively targeting C42, as such compounds have potential as novel antihypertensives with a mechanism of action that differs from current therapies...
July 17, 2017: Hypertension
https://www.readbyqxmd.com/read/28713578/retrospective-evaluation-of-pimobendan-and-sildenafil-therapy-for-severe-pulmonary-hypertension-due-to-lung-disease-and-hypoxia-in-28-dogs-2007-2013
#7
Lisa A Murphy, Nicholas Russell, Domenico Bianco, Reid K Nakamura
Pulmonary hypertension (PH) is the persistent abnormal increase in pulmonary artery (PA) pressure and in dogs is usually secondary to congenital disease causing pulmonary over circulation, chronic respiratory disease and elevated left atrial pressure. Sildenafil (SF) is a phosphodiesterase (PDE) V inhibitor that causes pulmonary artery (PA) vasodilation by increasing pulmonary vascular concentrations of cyclic guanosine monophosphate which subsequently increases the activity of endogenous nitric oxide. Pimobendan (PB) is a PDE III inhibitor with calcium sensitizing effects thereby exerting positive inotropy and vasodilation...
May 2017: Veterinary Medicine and Science
https://www.readbyqxmd.com/read/28713290/advanced-maternal-age-worsens-postpartum-vascular-function
#8
Jude S Morton, Alison S Care, Raven Kirschenman, Christy-Lynn Cooke, Sandra T Davidge
The age at which women experience their first pregnancy has increased throughout the decades. Pregnancy has an important influence on maternal short- and long-term cardiovascular outcomes. Pregnancy at an advanced maternal age increases maternal risk of gestational diabetes, preeclampsia, placenta previa and caesarian delivery; complications which predict worsened cardiovascular health in later years. Aging also independently increases the risk of cardiovascular disease; therefore, combined risk in women of advanced maternal age may lead to detrimental cardiovascular outcomes later in life...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28712765/losartan-reverses-cox-2-dependent-vascular-dysfunction-in-offspring-of-hyperglycaemic-rats
#9
Diego Barbosa de Queiroz, Fernanda Elizabethe Ramos-Alves, Juliana Santos-Rocha, Gloria Pinto Duarte, Fabiano Elias Xavier
AIMS: This study examined whether chronic treatment with losartan, an angiotensin II type 1 receptor (AT1R) antagonist, might reverse COX-2-mediated vascular dysfunction in mesenteric resistance arteries (MRA) from offspring of hyperglycaemic rats. MATERIALS AND METHODS: Male 12-month-old offspring of hyperglycaemic (O-DR) and normoglycaemic (O-CR) rats were treated with losartan (15mg·kg·day(-1)) during 2months. Third order MRA of untreated and losartan-treated O-DR and O-CR were mounted in wire myograph for isometric tension measurements...
July 13, 2017: Life Sciences
https://www.readbyqxmd.com/read/28710081/use-of-a-next-generation-multi-durometer-long-guide-sheath-for-triaxial-access-in-flow-diversion-experience-in-95-consecutive-cases
#10
Li-Mei Lin, Matthew T Bender, Geoffrey P Colby, Narlin B Beaty, Bowen Jiang, Jessica K Campos, Judy Huang, Rafael J Tamargo, Alexander L Coon
BACKGROUND: Intracranial access techniques in modern neurointerventions have shifted towards more robust access platforms. The long guide sheath is one of the building blocks of triaxial systems used in intracranial embolizations. Here we present our experience with the AXS Infinity LS long sheath in the triaxial platform for the implantation of the Pipeline embolization device (PED). METHODS: We retrospectively identified patients who underwent PED Flex treatment with the AXS Infinity LS at a single institution...
July 14, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28708754/the-effect-of-vasodilatory-medications-on-radial-artery-spasm-in-patients-undergoing-transradial-coronary-artery-procedures-a-systematic-review
#11
Elizabeth Curtis, Ritin Fernandez, Astin Lee
BACKGROUND: The uptake of percutaneous coronary procedures via the radial artery has increased internationally due to the decreased risk of complications and increased patient satisfaction. The increased susceptibility of the radial artery to spasm however presents a potential risk for procedural failure. Although most experts agree on the need for prophylactic medications to reduce radial artery spasm, currently there is inconsistency in literature regarding the most effective vasodilatory medication or combination of medications...
July 2017: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/28707660/-increase-in-the-concentration-of-seh-protein-in-renal-medulla-of-isiah-rats-with-inherited-stress-induced-arterial-hypertension
#12
T O Abramova, M A Ryazanova, E V Antonov, O E Redina, A L Markel
The concentration of soluble epoxide hydrolase (sEH) protein was studied in renal medulla of adult rats from hypertensive ISIAH strain and normotensive WAG strain. The sEH is a key enzyme in metabolism of epoxyeicosatrienoic acids capable of activating endothelial NO-synthase and nitrogen oxide formation, and therefore being vasodilators. An increase in the sEH protein concentration (that we found) allows one to assume that the oxidative stress is increased in the renal medulla of hypertensive rats, and the bloodflow is decreased...
May 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28706000/absence-of-compensatory-vasodilation-with-perfusion-pressure-challenge-in-exercise-evidence-for-and-implications-of-the-non-compensator-phenotype
#13
Robert F Bentley, Jeremy J Walsh, Patrick J Drouin, Aleksandra Velickovic, Sarah J Kitner, Alyssa M Fenuta, Michael E Tschakovsky
Compromising oxygen delivery (O2D) during exercise requires compensatory vasodilatory and/or pressor responses to protect O2D : demand matching. The purpose of the study was to determine whether compensatory vasodilation is absent in some healthy, young individuals in the face of a sudden reduction in exercising forearm perfusion pressure, and whether this affects the exercise pressor response. 21 healthy, young males (21.6±2.0yrs) completed rhythmic forearm exercise at a work rate equivalent to 70% of their own maximal exercise vasodilation...
July 13, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28705908/importance-of-kynurenine-in-pulmonary-hypertension
#14
Bence M Nagy, Chandran Nagaraj, Andreas Meinitzer, Neha Sharma, Rita Papp, Vasile Foris, Bahil Ghanim, Grazyna Kwapiszewska, Gabor Kovacs, Walter Klepetko, Thomas R Pieber, Harald Mangge, Horst Olschewski, Andrea Oslchewski
The tryptophan metabolite kynurenine is significantly increased in pulmonary arterial hyper-tension (PAH) patients, and it is a potent vasodilator of systemic arteries. Our aim was to in-vestigate the role of kynurenine in the pulmonary circulation. Serum tryptophan, kynurenine and kynurenic-acid levels were measured in 20 idiopathic PAH (IPAH) patients, 20 healthy controls and 20 patients with chronic lung disease or meta-bolic syndrome without-PH. Laser-dissected pulmonary arteries from IPAH and control lungs were tested for the expression of IDO, the rate-limiting enzyme for the conversion from tryptophan to kynurenine...
July 13, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28704259/systemic-blood-pressure-at-exercise-in-hypoxia-in-hypertensive-and-normotensive-patients
#15
Laurent Winkler, François J Lhuissier, Jean-Paul Richalet
OBJECTIVES: The current study aimed to determine whether acute hypoxia exposure in laboratory conditions associated with exercise induces an increase in systemic blood pressure (BP) in normotensive and hypertensive patients, and whether hypertensive patients are more prone to develop severe acute mountain sickness (sAMS). Finally, to determine if BP changes at exercise in acute hypoxia in hypertensive patients are predictive factors for sAMS. METHODS: From 2012 to 2015, 852 normotensive and 106 hypertensive patients went through an acute hypoxia exercise test before a sojourn at high altitude...
July 12, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28703351/a-comparative-study-between-responses-of-isolated-bovine-and-equine-digital-arteries-to-vasoactive-mediators
#16
C Zizzadoro, M Caruso, S Punzi, G Crescenzo, F Zongoli, C Belloli
Hemodynamic perturbations, partly resulting from abnormal vasoconstriction of digital vessels, have been implicated in the pathogenesis of bovine and equine laminitis. This study compared the responsiveness of isolated bovine (BDA) and equine (EDA) digital arteries to pharmacological agents that stimulate receptor systems involved in the regulation of normal vessel tone. The role of the endothelium and the short- and longer-term effects of an experimentally induced endothelial damage were also evaluated. Species-related differences were found in the vessel reactivity to all of the receptor agonists tested...
July 13, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28697925/variable-expressivity-of-a-founder-mutation-in-the-eif2ak4-gene-in-hereditary-pulmonary-veno-occlusive-disease-and-its-impact-on-survival
#17
Paula Navas Tejedor, Julián Palomino Doza, Jair Antonio Tenorio Castaño, Ana Belén Enguita Valls, José Julián Rodríguez Reguero, Amaya Martínez Meñaca, Ignacio Hernández González, Héctor Bueno Zamora, Pablo Daniel Lapunzina Badía, Pilar Escribano Subías
INTRODUCTION AND OBJECTIVES: Hereditary pulmonary veno-occlusive disease (PVOD) has been associated with biallelic mutations in EIF2AK4 with the recent discovery of a founder mutation in Iberian Romani patients with familial PVOD. The aims of this study were phenotypical characterization and survival analysis of Iberian Romani patients with familial PVOD carrying the founder p.Pro1115Leu mutation in EIF2AK4, according to their tolerance to pulmonary vasodilators (PVD). Familial genetic screening was conducted, as well as assessment of sociocultural determinants with a potential influence on disease course...
July 8, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/28696251/endothelin-1-stimulates-vasoconstriction-through-rab11a-serine-177-phosphorylation
#18
Xue Zhai, Marie D Leo, Jonathan H Jaggar
Rationale: Large-conductance calcium (Ca(2+))-activated potassium channels (BK) are composed of pore-forming BKα and auxiliary β1 subunits in arterial smooth muscle cells (myocytes). Vasoconstrictors, including endothelin-1 (ET-1), inhibit myocyte BK channels, leading to contraction, but mechanisms involved are unclear. Recent evidence indicates that BKα is primarily plasma membrane-localized, whereas the cellular location of β1 can be rapidly altered by Rab11A-positive recycling endosomes. Whether vasoconstrictors regulate the multi-subunit composition of surface BK channels to stimulate contraction is unclear...
July 10, 2017: Circulation Research
https://www.readbyqxmd.com/read/28693906/reproducible-computer-assisted-quantification-of-myocardial-perfusion-with-contrast-enhanced-ultrasound
#19
Yuanwei Li, Navtej Chahal, Roxy Senior, Meng-Xing Tang
Myocardial perfusion can be quantified by myocardial contrast echocardiography (MCE) and is used for the diagnosis of coronary artery disease (CAD). However, existing MCE quantification software is highly operator dependent and has poor reproducibility and ease of usage. The aim of this study was to develop robust and easy-to-use software that can perform MCE quantification accurately, reproducibly and rapidly. The developed software has the following features: (i) semi-automatic segmentation of the myocardium; (ii) automatic rejection of MCE data with poor image quality; (iii) automatic computation of perfusion parameters such as myocardial blood flow (MBF)...
July 7, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28691670/non-occlusive-mesenteric-ischemia-nomi-in-parkinson-s-disease-case-report
#20
G Salamone, C Raspanti, L Licari, N Falco, G Rotolo, G Augello, G Melfa, G Gulotta
Non-occlusive mesenteric ischemia (NOMI) is a severe pathological condition characterized by signs and symptoms of bowel obstruction, intestinal necrosis resulting from acute and/or chronic inadequate blood perfusion, in the absence of an organic vascular obstruction detectable by imaging techniques. A 64 years old man case with a history of Parkinson's disease in high-functioning levodopa treatment is presented. Clinical and radiological signs of intestinal obstruction were observed. He underwent surgical operation with total colectomy and terminal ileostomy for generalized secondary peritonitis due to perforation of sigmoid colon...
March 2017: Il Giornale di Chirurgia
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