Search results for "Left"
showing 10 items of 819 documents
Graph cut-based method for segmenting the left ventricle from MRI or echocardiographic images
2017
International audience; In this paper, we present a fast and interactive graph cut method for 3D segmentation of the endocardial wall of the left ventricle (LV) adapted to work on two of the most widely used modalities: magnetic resonance imaging (MRI) and echocardiography. Our method accounts for the fundamentally different nature of both modalities: 3D echocardiographic images have a low contrast, a poor signal-to-noise ratio and frequent signal drop, while MR images are more detailed but also cluttered and contain highly anisotropic voxels. The main characteristic of our method is to work in a 3D Bezier coordinate system instead of the original Euclidean space. This comes with several ad…
Isolated non-compaction of the myocardium as a cause of coronary and cerebral embolic events in the same patient.
2009
A 44-year-old woman with a history of smoking and previous cerebral thrombo-embolism presented to the emergency department with prolonged chest pain and ECG changes showing an acute anterior myocardial infarction. She was referred to the cath-lab for primary angioplasty. Coronary angiography showed a thrombotic occlusion at the origin of first diagonal …
Diagnóstico etilógico de la disfunción ventricular izquierda con tomografia computerizada: comparación con coronariografía y cardiorresonancia
2012
[EN] Introduction and objectives To evaluate the capability of multidetector computed tomography to diagnose the coronary etiology of left ventricular dysfunction compared with using invasive coronary angiography and magnetic resonance. Methods Forty consecutive patients with left ventricular dysfunction of uncertain etiology underwent invasive coronary angiography and contrast magnetic resonance. All patients were evaluated with multidetector computed tomography including coronary calcium presence and score, noninvasive coronary angiography, and myocardial tissue assessment. Results The sensitivity and specificity of the presence of coronary calcium to identify left ventricular dysfunction…
Assessment of left main coronary artery atherosclerotic burden using 64-slice CT coronary angiography: correlation between dimensions and presence of…
2009
PURPOSE: The aim of this study was to correlate left main (LM) coronary artery dimensions with the presence of atherosclerosis by multidetector-row computed tomography (MDCT) coronary angiography (CA) and to assess coronary atherosclerotic plaques with a semiquantitative method. MATERIALS AND METHODS: Sixty-two consecutive patients (41 men, mean age 60+/-11) with suspected coronary artery disease underwent 64-MDCT coronary angiography. LM dimensions (length, ostial and bifurcation diameters), quantitative [location, Hounsfield unit (HU) attenuation] and qualitative (composition, shape) analysis of plaques within the LM were performed. All patients underwent conventional CA. RESULTS: Thirty …
Erfahrungen mit einer 3D-Navigatorsequenz zur Koronargefäßdarstellung an einem Hochleistungs-MR-System
2002
Purpose: To evaluate MR coronary angiography using a three-dimensional navigator echo sequence on a MR scanner with a high performance gradient system. Material and Methods: Five healthy volunteers were examined with a 1.5 Tesla MR system, using a high performance prototype gradient system (peak amplitude 50 mT/m, rising time 600 μs). For imaging, a navigated gradient-echo pulse sequence with an in-plane resolution between 0.63 × 0.63 and 0.78 × 0.78 mm 2 was used. Per patient two overlapping slabs were acquired. The number of visualised coronary artery segments was estimated (AHA classification). In addition, signal-to-noise measurements were performed in the ascending aorta at the level o…
Quantitative Coronary Angiography and Digital Densitometric Perfusion Measurements?How to Assess the Success of Intracoronary Balloon Dilatation
1988
Densitometric evaluation of digital subtraction angiocardiograms allows the assessment of local myocardial perfusion before and after pharmacological stimulation of coronary flow reserve during the catheterization procedure. This report deals with a case of a severe stenosis of the left coronary artery in which PTCA was regarded successful based on an appropriate increase in luminal diameter while an intima and media dissection at the dilatation site was documented. The perfusion measurements, however, pointed out a clear impairment of poststenotic myocardial perfusion after PTCA.
Heart Failure: Really Idiopathic?
2016
Coronary angiography is necessary in the differential diagnosis of a newly discovered heart failure, which may be caused by multivessel disease and/or stenoses of major vessels. However, angiography is associated with a relatively high percentage of false negative findings in the assessment of left main disease. FFR allows unveiling these false negatives, even though special precautions need to be taken when stenoses are present also in the bifurcation branches.
Different effects of losartan and delapril on plasma PAI-1 levels in patients with mild to moderate hypertension
2003
ACE probably influences the fibrinolytic system at acentral point by converting angiotensin I to angiotensin II,which increases PAI-1 activity. This effect appears to bemediated via the AT1-receptor in humans. The RAAS mayalso contribute to a reduction in t-PA production by degra-dation of bradykinin, since the latter increases the release ofprostacyclin, nitric oxide, and t-PA from endothelial cells.Accordingly, ACE inhibitors not only influence the fibrino-lytic system by a reduction of PAI-1 activity but also byincreasing t-PA activity [1–3]. However, few studies haveanalysed the effects of AT1-R antagonists on t-PA and PAI-1plasma levels and the in vivo effects of AT1-R antagonistson th…
De Caperucita Roja a las slasher movies: reescrituras del cuento tradicional en la ficción cinematográfica norteamericana
2011
Desde los albores de la civilización, los relatos populares se han transmitido de generación en generación, conformando un tapiz tupido e interrelacionado que va desde la prehistoria de los indígenas norteamericanos y el Antiguo Testamento hasta nuestros días. A medida que los cuentos perviven al pasar de abuelos a nietos, estos desempeñan un papel determinante para la formación, la consolidación y la transmisión de los valores e ideales de la sociedad. Sin embargo, los avances tecnológicos y los profundos cambios que se producen en la sociedad estadounidense del siglo xx hacen que estas manifestaciones artísticas y culturales deban adaptarse a nuevos medios de transmisión. En el presente a…
The use made of video in the social media by candidates in the 2019 Valencian Autonomous Government elections
2020
Videos are increasingly being used in social networks for a wide range of purposes, including political campaigning. Here, social media seem to be gaining an edge over the mainstream variety when it comes to making political choices, especially during election campaigns. This paper examines the extent to which social media is used in Valencian Autonomous Government elections and looks at each of the candidate's experiences in this regard in the April 2019 elections. We pay particular attention to the differences between the three networks analysed — Facebook, Twitter and Instagram, and consider what kind of video information is shared. For these purposes, we create nine formal categories, s…