Search Results
Results 1 - 50 of 2893
1 2 3 4 5 6 7 8 9 10 >
Sing N B NB IJN-UTM Cardiovascular Engineering Center & Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, - - 2014
This article reports a degradation study that was done on stent prototypes made of biodegradable Fe35Mn alloy in a simulated human coronary arterial condition. The stent degradation was observed for a short-term period from 0.5 to 168 h, which simulates the early period of stenting procedure. Potentiodynamic polarization and electrochemical ...
Matsumoto Takashi T Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California, - - 2014
A 47-year-old-man with prior pulmonary vein (PV) isolation for atrial fibrillation developed progressive shortness of breath and was found to have total occlusion of the left lower and significant stenosis in left upper PV. A ventilation/perfusion scan showed decreased left lung perfusion. Percutaneous pulmonary vein stenosis angioplasty was complicated by ...
Pentz A - - 2014
Colonisation of the airway by Pseudomonas spp. in cystic fibrosis has been reported to be an important determinant of decline in pulmonary function. To assess pulmonary function decline and the presence of bacterial colonisation in patients with cystic fibrosis (CF) attending a CF clinic in a developing country. A retrospective ...
Polovina Marija M Cardiology Clinic, Clinical Center of Serbia, Belgrade, Serbia. - - 2014
Previously, endocarditis caused by Pseudomonas aeruginosa mostly involved right-sided valvular infection and generally carried a good prognosis. Recently, changes have been observed in the occurrence and clinical presentation of pseudomonal endocarditis, with increasing incidence of nosocomial infections and involvement of the aortic and mitral valves. Still, pseudomonal left-sided endocarditis is ...
Slipczuk Leandro L Department of Medicine, Einstein Medical Center, Philadelphia, PA, - - 2013
The mitral annulus plays an essential role in mitral valve (MV) competency. When surgical intervention is needed, the placement of an annular ring is considered a major component of MV repair. However, the use of a foreign material increases the risk of infectious and thromboembolic complications and is problematic in ...
Schwameis R - - 2013
Time-kill curves were performed with linezolid, doripenem, tigecycline, moxifloxacin and daptomycin against Staphylococcus aureus and with colistin, moxifloxacin and doripenem against Pseudomonas aeruginosa to evaluate the effect of porcine pulmonary surfactant on antimicrobial activity. Pulmonary surfactant significantly impaired the activities of moxifloxacin and colistin. When developing antibiotics for respiratory tract ...
Yamada Takumi - - 2013
 A 70-year-old man with atrial flutter (AFL) following pulmonary vein (PV) isolation (PVI) underwent electrophysiologic testing. The AFL exhibited positive P waves in the inferior leads and lead V1. Left atrial activation mapping revealed 2 remote sites with early activation that were located at the antrum of the left superior ...
Shon Alyssa S - - 2013
Mycotic aneurysms of the intrapetrous carotid artery are a rare complication of adjacent middle ear infections that occur by direct invasion of arterial adventitia. We report the first case of a Pseudomonas aeruginosa mycotic intrapetrous carotid aneurysm arising from mastoiditis, confirmed with middle ear cultures, presenting with high-grade bacteraemia and ...
Duytschaever Mattias - - 2012
AIMS: Prior reports using pacing manoeuvres, demonstrated an up to 42% prevalence of residual pulmonary vein to left atrium (PV-LA) exit conduction after apparent LA-PV entry block. We aimed to determine in a two-centre study the prevalence of residual PV-LA exit conduction in the presence of unambiguously proven entry block ...
Kumar Saurabh - - 2012
BACKGROUND: -Catheter-tissue contact is critical for effective lesion creation. We characterized the contact force (CF) at different anatomical sites during antral pulmonary vein isolation (PVI) for atrial fibrillation (AF). METHODS AND RESULTS: -Two experienced operators performed PVI in 22 patients facilitated by a novel CF-sensing ablation catheter in a blinded ...
Traullé Sarah - - 2012
Although pulmonary vein (PV) stenosis is a serious complication of radiofrequency PV isolation, the anatomical impact of a combination of two energy sources on PV diameter has not been evaluated. The aim of this study was to evaluate the impact of supplementary point-by-point radiofrequency applications (following PV cryoablation) on the ...
Khoo Jeffrey P - - 2012
BACKGROUND: In patients being considered for aortic valve replacement, there remains controversy over which design or tissue offers the best performance. We aimed to evaluate in a single study the haemodynamic performances of five different widely used aortic valve prostheses: stentless porcine xenograft (Elan), stentless bovine pericardium (Pericarbon Freedom), stented ...
Yap Choon Hwai - - 2012
The bicuspid aortic valve (BAV) is a common congenital malformation of the aortic valve (AV) affecting 1% to 2% of the population. The BAV is predisposed to early degenerative calcification of valve leaflets, and BAV patients constitute 50% of AV stenosis patients. Although evidence shows that genetic defects can play ...
Kirklin James K - - 2012
A novel technique of valve-sparing aortic root replacement was applied to 2 children younger than 3 years of age with Marfan syndrome and large aortic root aneurysms. Using elements of both the remodeling and reimplantation techniques, circumferential rings from a 20-mm to 22-mm polyester graft provide stabilization at the subannular ...
Xu Liyan - - 2012
To explore the association between the hemodynamics and formation, growth, and rupture of aneurysms in anterior communicating arteries (ACoA) with A1 dysplasia or hypoplasia. A series of 3-dimensional numerical simulation models of the anterior communicating artery complex (ACoAC) were designed geometrically. The diameter of A1 was fixed on one side ...
Chen Liang-Wan - - 2012
We describe a modified valve-sparing aortic root replacement technique for acute type A aortic dissection. After the normal root geometry was restored by removing blood and clots in the proximal false lumen and the valve insufficiency was corrected by simple resuspension of the aortic commissures, three teardrop-shaped patches were sutured ...
Wang Qian - - 2012
The objective of this study was to develop a patient-specific computational model to quantify the biomechanical interaction between the transcatheter aortic valve (TAV) stent and the stenotic aortic valve during TAV intervention. Finite element models of a patient-specific stenotic aortic valve were reconstructed from multi-slice computed tomography (MSCT) scans, and ...
Katayama Susumu S Department of Human and Engineered Environmental Studies, School of Frontier Sciences, The University of Tokyo, Tokyo, - - 2013
The objective of this study was to examine the influence of the morphologic characteristics of the bicuspid aortic valve on its disease progression by comparing the motion, stress/strain distribution, and blood flow of normal and stenotic tricuspid valves using simulation models. Bicuspid, stenotic tricuspid with commissural fusion or thickened leaflet, ...
Bosman W M P F - - 2012
The purpose of this in vitro study was to investigate the influence of aneurysm wall stiffness and of the presence of intraluminal thrombus (ILT) on aneurysm wall movement. Three latex aneurysms were used with different wall stiffness. The aneurysms, equipped with 20 tantalum markers, were attached to an in vitro ...
Sokol Vesna - - 2012
In Marfan syndrome, with dilatation of the aortic root secondary to an underlying connective tissue defect, pregnancy can cause hemodynamic stress leading to the development of an aortic aneurysm and even a fatal aortic dissection. In the presence of existing aortic root enlargement and a family history of aortic dissection, ...
Neragi-Miandoab Siyamek - - 2012
Aortic root aneurysm and dissection are potentially life-threatening conditions that involve a structural weakness of the aortic wall. Management of aortic root aneurysm (with or without aortic insufficiency) has recently been the subject of much scholarly discussion which resulted in some modifications. The current trend is a valve-sparing root repair ...
Chandraratna P Anthony N - - 2012
Background: Dobutamine stress echocardiography (DSE) is commonly used for the diagnosis for coronary artery disease (CAD). We previously demonstrated that squatting induces wall motion abnormalities (WMA) in areas subtended by stenotic coronary arteries. Objective: This study was designed to test the hypothesis that dobutamine and squatting stress echocardiography are equally ...
Hirose Tomoaki - - 2012
A 76-year-old man with systemic lupus erythematosus was found to have an aneurysm of the right sinus of Valsalva. Aortic root replacement with a stentless bioprosthesis, using a full root technique, was successfully performed. The pathological findings of the excised aortic valve were not secondary to atherosclerosis, inflammatory or infectious ...
Thim Troels - - 2012
Wall shear stress is thought to play a critical role in the local development of atherosclerotic plaque and to affect plaque vulnerability. However, current models and hypotheses do not fully explain the link between wall shear stress and local plaque development. We aimed to investigate the relation between wall shear ...
García-Herrera C M - - 2012
The mechanical properties of aortic wall, both healthy and pathological, are needed in order to develop and improve diagnostic and interventional criteria, and for the development of mechanical models to assess arterial integrity. This study focuses on the mechanical behaviour and rupture conditions of the human ascending aorta and its ...
Goto Shin-Nosuke - - 2012
We describe a 48-year-old man with aorto-pseudoaneurysm-ventricular regurgitation. It was due to disruption of both proximal and distal anastomoses after aortic root replacement for detachment of a prosthetic valve implanted for a sinus of Valsalva aneurysm with aortic valve regurgitation. The chest was opened during cardiopulmonary bypass using a deep ...
Nakagiri Keitaro - - 2012
We describe an isolated extracardiac unruptured acquired aneurysm in the right coronary sinus of Valsalva, which was seen in a 55-year-old woman with Marfan's syndrome. The patient underwent aortic root replacement using a reimplantation technique. Pathologic examination revealed absence of the medial elastic fiber of the aortic wall of the ...
Vahidi Bahman - - 2012
Arterial embolism is responsible for the death of lots of people who suffers from heart diseases. The major risk of embolism in upper limbs is that the ruptured particles are brought into the brain, thus stimulating neurological symptoms or causing the stroke. We presented a computational model using fluid-structure interactions ...
Masoumi Khalil Abad Ehsan - - 2012
In a mechanical component, stress-concentration is one of the factors contributing to reduce fatigue life. This paper presents a design methodology based on shape optimization to improve the fatigue safety factor and increase the radial stiffness of Nitinol self-expandable stent-grafts. A planar lattice free of stress concentrators is proposed for ...
Chandra Santanu - - 2012
The bicuspid aortic valve (BAV) is associated with a high prevalence of calcific aortic valve disease (CAVD). Although abnormal hemodynamics has been proposed as a potential pathogenic contributor, the native BAV hemodynamic stresses remain largely unknown. Fluid-structure interaction models were designed to quantify the regional BAV leaflet wall-shear stress over ...
Pirozzi Nicola - - 2012
Purpose: Loco-regional anesthesia, along with the neurosensitive inhibition causes arterial and venous vasodilatation, that could be of interest for vascular access surgery. We evaluated the long term vasoplegia persistence after brachial plexic block. Methods: Five patients submitted to brachial plexus block for an orthopedic procedure have been observed. Both radial ...
Kim Ji-Hyun - - 2011
Using semiserial sections from 19 human fetuses of 8-30 weeks gestation, we examined the topohistology of the upper abdominal lymphatics and compared it with that of the lower abdominal and pelvic lymphatics. The upper abdominal lymphatics were characterized by an intimate relationship with the peritoneal lining, a common mesentery for ...
Sievers Hans-Hinrich - - 2012
Modern analyses of data for scientific reporting and healthcare management purposes require standardized and consistent definitions, something which also holds true for aortic root surgery, as part of the cardiovascular surgery spectrum. The aim of the present study was to investigate the currently employed nomenclature of the aortic root components. ...
Lawrence-Brown Michael - - 2011
The aim of this study is to investigate the biomechanical stress and strain behaviour within the wall of the artery and its influence on plaque formation and rupture using computational fluid dynamics (CFD). A three-dimensional finite-element model of the carotid bifurcation was generated to analyse the wall stress and strain ...
Wang Bao Jian - - 2011
The fetal gallbladder (GB) is embedded in a deep fossa surrounded by the liver parenchyma. Using 15 specimens with intrahepatic GB (crown-rump length 45-92 mm; approximately 9-13 weeks of gestation), we assessed the fetal topographical anatomy of the hepatocystic triangle and the porta hepatis. The cystic duct displayed a long ...
Mufarrij Afif Jean - - 2011
Phlegmesia cerulea dolens (PCD) is a rare complication of deep vein thrombosis characterized by massive venous thrombosis leading to arterial compromise and tissue ischaemia. PCD carries high morbidity and mortality and is an often times overlooked cause of acute limb ischaemia that must be recognized and treated promptly. Early referral ...
Rocha Ana - - 2011
Frequent dialysis line insertion can result in central venous occlusions rendering such access of difficult catheterization. New strategies to overcome this difficulty have been reported. This problem also occurs together with accidental loss of tunneled dialysis catheters, periodically observed in chronic hemodialysis patients. We developed a new technique to apply ...
Georgianos Panagiotis I - - 2011
Background/Aims: Arterial stiffening characterizes the vasculature of end-stage renal disease (ESRD) patients and is a strong predictor of their cardiovascular morbidity and mortality. Previous studies evaluating the effect of hemodialysis on large artery elasticity gave contradictory results. This study aimed to investigate the impact of hemodialysis on arterial stiffness and ...
Abdulla Jawdat - - 2011
To determine via meta-analysis the diagnostic accuracy of 64-slice computed tomography coronary angiography (CTA) for assessment of significant obstructive coronary artery stenosis at different coronary artery calcium score (CACS) levels. Data of 12,053 versus 5,890 segments, 906 versus 758 arteries and 1,120 versus 514 patients in low versus high CACS ...
Lehr Eric J - - 2011
Aortic root replacement is a complex operation for severe aortic root pathology such as aneurysms and dissections with concomitant aortic valve disease. Biological and mechanical valve conduits are available. Early and midterm results were analyzed in patients undergoing aortic root replacement. From January 1, 1998, to May 31, 2007, 144 ...
Rubio Alvarez Jose - - 2011
Biological glue is increasingly used in cardiac surgery. We report a case of type A aortic dissection repair that was complicated by subsequent pulmonary embolism due to BioGlue® (Cryolife Inc, Hennesaw, GA, USA). To our knowledge this is the first report of a case with this complication. Keywords: Pulmonary embolism; ...
Mizuno Masashi - - 2011
A 68-year-old man was admitted with acute renal failure caused by cholesterol embolization after undergoing carotid artery stenting. Hemodialysis therapy (HD) was immediately required because of uremia, using nafamostat mesilate as an anticoagulant for HD. However, blue toes and gangrene of the feet worsened. To prevent use of anticoagulants and ...
Durand Marion - - 2011
Recombinant activated factor VII (rFVIIa), which is used off-label as an adjuvant therapy for uncontrolled and life-threatening bleeding, might also attenuate intractable bleeding related to macrovascular arterial lesions. Here we evaluated the efficacy of rFVIIa in sealing a large arterial wound in haemostatically competent rabbits. Sixty male New Zealand rabbits ...
Dregelid Einar B - - 2011
Vein lacerations in awkward locations are difficult to repair and carry high mortality. The hemostatic fleece, TachoSil, is effective in preventing intraoperative bleeding in different settings, but has not been recommended for use in large vein injury. TachoSil with a peritoneal patch interposed to avoid vein thrombosis has been reported ...
Bai Xiao-Yan - - 2010
Graft spasm remains challenging in CABG (coronary artery bypass grafting) surgery. We investigated the inhibitory effect of a dihydropyridine calcium antagonist amlodipine on the vasoconstriction mediated by potassium chloride (KCl), human urotensin-II (hU-II), and U46619 in human internal mammary artery (IMA) from patients undergoing CABG. Isolated IMA rings (n = ...
Corsini Chiara C Laboratory of Biological Structure Mechanics, Structural Engineering Department, Politecnico di Milano, Milan, - - 2011
A less-invasive procedure that combines interventional stent placement in the ductus arteriosus and surgical banding of the branch pulmonary arteries has been recently introduced in the treatment of the hypoplastic left heart syndrome (HLHS). The hemodynamic behaviour of this hybrid approach has not been examined before in a mathematical model. ...
Rummery Nicole M - - 2010
Sympathetic nerve-mediated contractions of mesenteric and tail arteries controlled by preganglionic neurones decentralized by a spinal cord injury (SCI) are potentiated, and likely contribute to autonomic dysreflexia. However, reactivity to the α(1)-adrenoceptor agonist phenylephrine has been reported to be enhanced in vascular beds controlled by preganglionic neurones lying both rostral ...
Asghar M S - - 2010
Calcitonin gene-related peptide (CGRP) plays a fundamental role in the pathophysiology of neurovascular headaches. CGRP infusion causes headache and dilation of cranial vessels. However, it is unknown to what extent CGRP-induced vasodilation contributes to immediate head pain and whether the migraine-specific abortive drug sumatriptan, a 5-hydroxytryptamine 1B/1D agonist, inhibits CGRP-induced ...
Andersen Malene R - - 2011
This study aimed to investigate the endothelium-dependent relaxation of uterine small arteries from pregnant nonsmokers, smokers, and ex-smokers who stopped smoking early in pregnancy. Uterine arteries were dissected from myometrial biopsies obtained during elective cesarean sections of 34 uncomplicated, singleton pregnancies, and the vascular function was assessed in a wire ...
Tunstall Radhika R - - 2011
Previous studies from our laboratory demonstrated that melatonin inhibits nitric oxide (NO)-induced relaxation in porcine coronary arteries. The present study was designed to further characterize the mechanisms underlying this inhibitory effect of melatonin. Western immunoblot studies identified the presence of melatonin type 2 (MT(2)) receptors, but not MT(1) or MT(3) ...
1 2 3 4 5 6 7 8 9 10 >