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Dilated Aorta

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https://www.readbyqxmd.com/read/28214688/h2s-causes-contraction-and-relaxation-of-major-arteries-of-the-rabbit
#1
Martin Caprnda, Tawar Qaradakhi, Joanne L Hart, Nazarii Kobyliak, Radka Opatrilova, Peter Kruzliak, Anthony Zulli
OBJECTIVE: Cardiovascular disease (CVD) caused by atherosclerosis remains a worldwide burden. Hydrogen sulfide is a promising new therapeutic avenue for the treatment of CVD, however reports show exogenous H2S has both vasodilator and vasoconstrictor effects depending on organ examined, and in vitro studies in animal models which are not resistant to developing atherosclerosis are limited. We sought to determine if rabbit arteries constricted or dilated to hydrogen sulfide. MATERIAL AND METHODS: The aorta, carotid, renal and iliac arteries were harvested from New Zealand White rabbits (n=4) and subjected to a concentration response curve to the fast H2S releaser NaHS...
February 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28213405/inhibition-of-the-mtor-pathway-in-abdominal-aortic-aneurysm-implication-of-smooth-muscle-cell-contractile-phenotype-inflammation-and-aneurysm-expansion
#2
Guangxin Li, Lingfeng Qin, Lei Wang, Xuan Li, Alexander W Caulk, Jian Zhang, Pei-Yu Chen, Shijie Xin
The development of effective pharmacological treatment of abdominal aortic aneurysm (AAA) potentially offers great benefit to patients with pre-aneurysmal aortic dilation by slowing the expansion of aneurysms and reducing the need for surgery. To date, therapeutic targets for slowing aortic dilation have had low efficacy. Thus, in this study, we aim to elucidate possible mechanisms driving aneurysm progression in order to identify potential targets for pharmacological intervention. We demonstrate that mTOR signaling is over activated in aortic smooth muscle cells (SMCs) which contributes to murine AAA...
February 17, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28212480/-reintervention-with-percutaneous-balloon-angioplasty-in-patients-with-congenital-heart-disease-with-left-sided-obstructions
#3
Horacio Márquez-González, Diana López-Gallegos, Nataly Alejandra Pérez-Velázquez, Lucelli Yáñez-Gutiérrez
BACKGROUND: Left-sided cardiac obstructions represent 15% of congenital heart disease (CHD). The treatment in adults is surgical; however, balloon dilation by interventional catheterization can alleviate the symptoms in pediatric patients to allow them to reach the target height. The aim was to determine the survival and the factors associated with reintervention in patients with CHD with left-sided obstruction treated with balloon angioplasty. METHODS: A cohort study was conducted in patients aged 4 to 17 years with left-sided heart obstruction (valvular stenosis [VS], supravalvular aortic stenosis [SAS], coarctation of the aorta [CA]) successfully treated with balloon angioplasty...
2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/28203207/morphotype-dependent-flow-characteristics-in-bicuspid-aortic-valve-ascending-aortas-a-benchtop-particle-image-velocimetry-study
#4
Andrew McNally, Ashish Madan, Philippe Sucosky
The bicuspid aortic valve (BAV) is a major risk factor for secondary aortopathy such as aortic dilation. The heterogeneous BAV morphotypes [left-right-coronary cusp fusion (LR), right-non-coronary cusp fusion (RN), and left-non-coronary cusp fusion (LN)] are associated with different dilation patterns, suggesting a role for hemodynamics in BAV aortopathogenesis. However, assessment of this theory is still hampered by the limited knowledge of the hemodynamic abnormalities generated by the distinct BAV morphotypes...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28194732/late-post-avr-progression-of-bicuspid-aortopathy-link-to-hemodynamics
#5
Shiho Naito, Tatiana Gross, Kushtrim Disha, Yskert von Kodolitsch, Hermann Reichenspurner, Evaldas Girdauskas
BACKGROUND AND AIM OF THE STUDY: The ascending aortic dilatation may progress after aortic valve replacement (AVR) in bicuspid aortic valve (BAV) patients. Our aim was to evaluate rheological flow patterns and histological characteristics of the aneurysmal aorta in BAV patients at the time of reoperative aortic surgery. MATERIALS AND METHODS: 13 patients (mean age: 42 ± 9 years, 10 (77%) male) with significant progression of proximal aortopathy after isolated AVR surgery for BAV disease (i...
February 13, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28193613/apparent-aortic-stiffness-in-children-with-pulmonary-arterial-hypertension-existence-of-vascular-interdependency
#6
Michal Schäfer, D Dunbar Ivy, Steven H Abman, Alex J Barker, Lorna P Browne, Brian Fonseca, Vitaly Kheyfets, Kendall S Hunter, Uyen Truong
BACKGROUND: Left ventricular dysfunction, mediated by ventricular interdependence, has been associated with negative outcomes in children with pulmonary arterial hypertension (PAH). Considering the dilation of the pulmonary arteries as a paramount sign of PAH, we hypothesized that the ascending aorta will present signs of apparent stiffness in children with PAH and that this effect may be because of mechanical interaction with the dilated main pulmonary artery (MPA). METHODS AND RESULTS: Forty-two children with PAH and 26 age- and size-matched controls underwent comprehensive cardiac magnetic resonance evaluation...
February 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28185644/bicuspid-aortic-valve-morphotype-correlates-with-regional-antioxidant-gene%C3%A2-expression-profiles-in-the-proximal%C3%A2-ascending-aorta
#7
Julie A Phillippi, Jennifer C Hill, Marie Billaud, Benjamin R Green, Mary P Kotlarczyk, Thomas G Gleason
BACKGROUND: Bicuspid aortic valve (BAV) is associated with asymmetric dilatation of the proximal ascending aorta. We previously demonstrated increased susceptibility of smooth muscle cells to oxidative stress in the BAV-aneurysmal aorta and hypothesized that antioxidant expression is regionally defined and influenced by the BAV morphotype. METHODS: BAV valve morphology was defined according to number of raphes: type 0 (0 raphes), type 1 (1 raphe), or type 2 (2 raphes) and by the raphe location among the left (L), right (R) or non (N) coronary cusps...
February 6, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28184962/magnetic-resonance-imaging-4-d-flow-based-analysis-of-aortic-hemodynamics-in-turner-syndrome
#8
Raoul Arnold, Marie Neu, Daniel Hirtler, Charlotte Gimpel, Michael Markl, Julia Geiger
BACKGROUND: Cardiovascular surveillance is important in Turner syndrome because of the increased risk of aortic dilation and dissection with consecutively increased mortality. OBJECTIVE: To compare 4-D flow MRI for the characterization of aortic 3-D flow patterns, dimensions and vessel wall parameters in pediatric patients with Turner syndrome and age-matched controls. MATERIALS AND METHODS: We performed 4-D flow MRI measuring in vivo 3-D blood flow with coverage of the thoracic aorta in 25 patients with Turner syndrome and in 16 female healthy controls (age mean ± standard deviation were 16 ± 5 years and 17 ± 4 years, respectively)...
February 9, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28177058/effect-of-tobacco-smoke-on-hydrogen-sulfide-induced-rat-thoracic-aorta-relaxation
#9
H T Zhang, T Zhang, M Chai, J J Sun, X Y Yu, C Z Liu, C C Huang
Levels of hydrogen sulfide (H2S), a gaseous signaling molecule, are reduced in the serum of individuals who smoke. We hypothesized that tobacco smoke influenced smooth muscle relaxation by decreasing H2S levels and this effect could also influence expression of cystathionine γ-lyase (CSE) and sulfonylurea receptor-2 (SUR-2). The aim of this study was to explore the effect of tobacco smoke on H2S-mediated rat thoracic aorta relaxation and its possible mechanism. Thirty-two Sprague-Dawley rats were divided into four groups: control (C) group, short-term smoker (SS) group, mid-term smoker (MS) group, and long-term smoker (LS) group...
February 6, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28173744/glutathione-system-participation-in-thoracic-aneurysms-from-patients-with-marfan-syndrome
#10
Alejandra María Zúñiga-Muñoz, Israel Pérez-Torres, Verónica Guarner-Lans, Elías Núñez-Garrido, Rodrigo Velázquez Espejel, Claudia Huesca-Gómez, Ricardo Gamboa-Ávila, María Elena Soto
Aortic dilatation in Marfan syndrome (MFS) is progressive. It is associated with oxidative stress and endothelial dysfunction that contribute to the early acute dissection of the vessel and can result in rupture of the aorta and sudden death. We evaluated the participation of the glutathione (GSH) system, which could be involved in the mechanisms that promote the formation and progression of the aortic aneurysms in MFS patients. Patients and methods: Aortic aneurysm tissue was obtained during chest surgery from eight control subjects and 14 MFS patients...
February 8, 2017: VASA. Zeitschrift Für Gefässkrankheiten
https://www.readbyqxmd.com/read/28165556/complicated-thoraco-abdominal-aortic-dissection-presenting-with-lower-limb-ischemia-in-a-patient-with-bovine-arch-and-arteria-lusoria
#11
G-R Joliat, C Dubuis, S Déglise
We report the case of a 58-year-old man who presented with thoraco-abdominal pain and right lower limb ischemia due to type B aortic dissection. Moreover, the patient was discovered to have several concomitant aortic arch anomalies (bovine arch, arteria lusoria, and left vertebral artery arising from the aortic arch). Taking into account this complex anatomy, emergent femoral exploration with fenestration and thrombectomy was performed. The blood flow to the right lower limb was restored. A few days later the aortic dissection spread proximally, and the aortic arch dilatation enlarged...
January 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28164025/pulmonary-autograft-in-aortic-position-is-everything-known
#12
COMMENT
Francesco Nappi, Antonio Nenna, Cristiano Spadaccio, Massimo Chello
The Ross operation provides several advantages compared to other valve substitutes to manage aortic valve disease, such as growth potential, excellent hemodynamics, freedom from oral anticoagulation and hemolysis, and better durability. However, progressive dilatation of the pulmonary autografts after Ross operation reflects the inadequate remodeling of the native pulmonary root in the systemic circulation, which results in impaired adaptability to systemic pressure and risk of reoperation after the first decade...
January 2017: Translational pediatrics
https://www.readbyqxmd.com/read/28155626/serum-calprotectin-as-a-novel-biomarker-in-abdominal-aortic-aneurysm-pathogenesis-and-progression-preliminary-data-from-experimental-model-in-rats
#13
Demetrios Moris, Stamatios Theocharis, Spyridon Davakis, Nikolaos Patelis, Georgios Agrogiannis, Ioannis S Vlachos, Eleftherios Spartalis, Antonios Athanasiou, Chris Bakoyiannis, Despina N Perrea, Sotirios Georgopoulos
BACKGROUND: Abdominal aortic aneurysm (AAA) formation is associated with by inflammation and matrix degradation. This study tested the hypothesis that calprotectin, a novel biomarker for inflammation, as well as established biomarkers such as C-reactive protein (CRP) and matrix metalloproteinase-9 (MMP-9) could also be indicative inflammatory biomarkers during AAA pathogenesis and progression. We also evaluated the correlation of serum soluble Receptor for Advanced Glycation End Products (sRAGE) with AAA diameter and serum calprotectin levels...
February 2, 2017: Current Vascular Pharmacology
https://www.readbyqxmd.com/read/28149606/who-is-at-risk-of-dissection-or-rupture-in-moderately-dilated-ascending-aorta
#14
EDITORIAL
Pyung Chun Oh, Woong Chol Kang
No abstract text is available yet for this article.
December 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28148318/utility-of-4d-flow-mapping-in-eisenmenger-syndrome-with-pulmonary-atresia
#15
Soha Romeih, Heba Aguib, Magdi Yacoub
Management of patients with Eisenmenger syndrome with pulmonary atresia is challenging because of the complexity of the structure-function relationship of the components of the syndrome. Multi-modality imaging including cardiac magnetic resonance (CMR) 4D Flow offers unprecedented opportunities to unravel, at least in part, some of these components, and thus help in the management of these patients. In this study, we describe the use of these integrated methods with particular reference to CMR 4D Flow in a patient with Eisenmenger syndrome and pulmonary atresia and outline both the utility and the limitations...
December 2016: Cardiology in the Young
https://www.readbyqxmd.com/read/28148315/assessment-of-the-structure-and-function-of-the-aorta-by-echocardiography
#16
REVIEW
Anitha Parthiban, Girish Shirali
Echocardiography is the primary modality for imaging the aorta for the diagnosis and serial evaluation of pathological conditions. In this article, we review the methodology for optimal echocardiographic imaging of the various segments of the aorta and discuss abnormalities of the aorta including stenosis, dilation including aortopathy and sinus of Valsalva aneurysms, and fistulous communications involving the ascending aorta including aortoventricular tunnel and ruptured sinus of Valsalva aneurysm. We review novel echocardiographic measurements of aortic functional properties of the aorta such as elasticity and stiffness, and review the literature on the potential additive value of such measurements for structural assessment alone...
December 2016: Cardiology in the Young
https://www.readbyqxmd.com/read/28116311/genetic-and-epigenetic-regulation-of-aortic-aneurysms
#17
REVIEW
Ha Won Kim, Brian K Stansfield
Aneurysms are characterized by structural deterioration of the vascular wall leading to progressive dilatation and, potentially, rupture of the aorta. While aortic aneurysms often remain clinically silent, the morbidity and mortality associated with aneurysm expansion and rupture are considerable. Over 13,000 deaths annually in the United States are attributable to aortic aneurysm rupture with less than 1 in 3 persons with aortic aneurysm rupture surviving to surgical intervention. Environmental and epidemiologic risk factors including smoking, male gender, hypertension, older age, dyslipidemia, atherosclerosis, and family history are highly associated with abdominal aortic aneurysms, while heritable genetic mutations are commonly associated with aneurysms of the thoracic aorta...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28111407/determinants-of-aortic-size-and-stiffness-and-the-impact-on-exercise-physiology-in-patients-after-the-fontan-operation
#18
Hideo Ohuchi, Yosuke Hayama, Jun Negishi, Kanae Noritake, Aya Miyazaki, Osamu Yamada, Isao Shiraishi
The pathophysiology of congenital heart disease includes aortic dilation and increased stiffness. However, the clinical determinants and significance remain unclear in patients after the Fontan operation.Size and stiffness index (SI) of the ascending and descending aorta (aAO and dAO, respectively) were assessed using angiography in 130 consecutive Fontan patients and 30 age-matched controls. Compared with controls, Fontan patients showed a dilated aAO and smaller dAO (P < 0.0001) with greater SI (3.2 ± 0...
February 7, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28110491/a-two-stage-hybrid-approach-for-complex-aortic-coarctation-combined-with-ascending-descending-aorta-dilatation-and-concomitant-aortic-valve-regurgitation
#19
Shi-Jian Chen, Xiao-Bo Pu, Qi An, Yuan Feng, Mao Chen
We present a case of aortic coarctation combined with ascending-descending aorta dilatation and concomitant aortic valve regurgitation. The technique involved using endovascular stenting, a two-stage balloon dilation procedure post-stent implantation and a Bentall procedure.
January 22, 2017: Journal of Cardiac Surgery
https://www.readbyqxmd.com/read/28104936/myelopathy-in-adult-aortic-coarctation-causes-and-caveats-of-an-atypical-presentation
#20
Chandan Mourya, Ashish Verma, Anand Bansal, Ram C Shukla, Arvind Srivastava
A 57-year-old female presenting with acute-onset paraplegia was referred for magnetic resonance imaging (MRI) of cervico-dorsal spine. On MRI, multiple tortuous dilated vessels were noted in the epidural space with long segment cord compression and imaging features of compressive myelopathy. Associated small acute cervico-dorsal epidural hematoma was also noted in the same region. Computed tomography (CT) angiography was performed subsequently which revealed post-ductal coarctation of aorta with multiple arterial collaterals in the chest wall and spinal canal...
October 2016: Indian Journal of Radiology & Imaging
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