نتایج جستجو برای: single atrium

تعداد نتایج: 884257  

Journal: :Medical ultrasonography 2014
Silvia Lupu Adriana Mitre Dan Dobreanu

Left atrium enlargement is a pathophysiological response to volume and pressure overload associated with a wide range of cardiovascular disorders leading to left ventricle systolic and diastolic dysfunction. Physiological factors contribute to significant differences in left atrium size in normal individuals. Moreover, left atrium enlargement was shown to have a significant prognostic value for...

Journal: :British heart journal 1980
P D Bourdillon R A Foale A F Rickards

Cross-sectional echocardiography, combined with injections of contrast into peripheral arm veins, has been used to study 15 patients with atrial septal defects and 10 patients with an intact interatrial septum. Of 11 patients with ostium secundum or sinus venosus atrial septal defects and left-to-right shunts a defect could be visualised in all, and in eight some degree of transfer of contrast ...

Journal: :Circulation 1998
Z Wang L Yue M White G Pelletier S Nattel

BACKGROUND The inward rectifier K+ current (IK1) plays an important role in governing cardiac electrical activity and is well known to have different properties in the atrium compared with the ventricle. Several inward rectifier K+ channel (IRK) subunits (hIRK, HH-IRK1, HIR, and TWIK-1) with different properties have been cloned from human tissues, but their relative expression in cardiac tissu...

2007
Rashed Karim Raad Mohiaddin Daniel Rueckert

Segmentation of the left atrium is vital for pre-operative assessment of its anatomy in radio-frequency catheter ablation surgery, which is commonly used for treating atrial fibrillation. In this paper we present an automatic approach for segmenting the left atrium and its pulmonary veins from MR angiography (MRA) data sets. Based on the notion that in MRA the atrium becomes connected to surrou...

Journal: :Deutsche medizinische Wochenschrift 1992
Marta Matamala-Adell Jose M Vallejo-Gil Carlos Ballester-Cuenca

Implantation of a single-chamber pacemaker was planned in an 83-year-old woman with sick-sinus syndrome causing dizziness, bradycardia and tachycardia. After puncture of the right subclavian vein it proved impossible to advance a guide-wire into the superior vena cava, under fluoroscopy the wire always being seen to coil in the left subclavian vein and hence passing into a caudally directed vei...

2013
Andrew B. Godbehere Ken Goldberg

For a responsive audio art installation in a skylit atrium, we developed a single-camera statistical segmentation and tracking algorithm. The algorithm combines statistical background image estimation, per-pixel Bayesian segmentation, and an approximate solution to the multi-target tracking problem using a bank of Kalman filters and GaleShapley matching. A heuristic confidence model enables sel...

Journal: :Journal of clinical images and medical case reports 2022

Anomalous Pulmonary venous connection is drainage of one or more pulmonary veins outside left atrium. Venous Connection most common on Left side upper vein drains directly into innominate to ultimately drain right Right Partial can be Superior Vena Cava, Atrium, Innominate rarely Inferior Cava.

According to the energy crisis in the world, optimization of energy consumption is indispensable. Technological advances in constructions and application of renewable energy resources demand saving energy. Atrium, as one of the construction elements, catches sufficient daylight and acts as a passive solar element and results in a decline of energy consumption. This research seeks to evalu...

Journal: :The Tohoku journal of experimental medicine 1974
S Chiba

CHIBA, S. Potentiation of the Negative Chronotropic and Isotropic Effects of Adenosine by Dipyridamole. Tohoku J. exp. Med ., 1974, 114 (1), 45-48 The isolated right atrium of the dog was perfused with blood led from a support dog. The selective injection of dipyridamole into the sinus node artery at a dose of 1-10 ƒÊg induced a slight negative chronotropic and positive inotropic effect. The ad...

Journal: :JACC. Cardiovascular interventions 2015
Konstantinos Aznaouridis Neil Hobson Christopher Rigg Thanjavur Bragadeesh

A 60-year-old man with arrhythmogenic right ventricular dysplasia, dilated right heart chambers, moderate tricuspid regurgitation, and mild pulmonary hypertension (systolic pulmonary pressure of 45 mm Hg) underwent pulmonary vein isolation (PVI) under general anesthesia due to symptomatic atrial fibrillation. Using a single transseptal puncture–double transseptal approach, a 12-F FlexCath Advan...

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