Search results for " atrium"

Correlation between atrial fibrillation driver locations and complex fractionated atrial electrograms in patients with persistent atrial fibrillation.

2018

Introduction The aim of this study was to evaluate a spatial correlation between active atrial fibrillation (AF) drivers measured by electrocardiographic imaging and complex fractionated atrial electrograms (CFAEs) in patients with persistent AF. Methods Sixteen patients with persistent AF were included. A biatrial geometry relative to an array of 252-body-surface-electrodes was obtained from a noncontrast computed tomography scan. The reconstructed unipolar AF electrograms were signal-processed (ECVUE™, CardioInsight Technologies Inc., Cleveland, OH, USA) to identify AF drivers. Before driver ablation, a biatrial mapping using the NavX system (St. Jude Medical, St. Paul, MN, USA) was perfo…

Simplifying atrial fibrillation ablation: how far can we go?

2013

The procedural end point of electrical isolation of the pulmonary veins (PVs) for the treatment of atrial fibrillation (AF) has been debated extensively. After identifying the PVs as the dominant arrhythmogenic site of paroxysmal AF, 2 fundamentally different approaches to the interventional treatment of AF were introduced. Haissaguerre et al developed a technique to electrically isolate the PVs by targeting electrophysiological (EP) breakthroughs from the left atrium to the PVs guided by a circular mapping catheter. In contrast, Pappone et al implemented an anatomical approach that used circumferential ablation lines around the PVs guided by a 3-dimensional mapping system. This latter appr…

Nachweis von Markembolien wÄhrend Oberschenkelmarknagelungen mittels transösophagealer Echokardiographie

1989

Kardiopulmonale Komplikationen nach Marknagelosteosynthesen, insbesondere am Oberschenkel, sind bekannt. WAhrend der Nagelung einer Oberschenkelquerfraktur mit einem, geschlossenen distalen Fragment konnten durch transsophageale Echokardiographie im rechten Herzen durchstromende echogene Partikel nachgewiesen werden. Das intrakardiale Auftreten dieser Partikel stand in engem zeitlichen Zusammenhang mit dem Aufbohren der femoralen Markhohle und kann als Nachweis verschleppter Marksubstanz gedeutet werden. Die intraoperative Echokardiographie bietet sich an, Untersuchungen uber die Pathophysiologie kardiopulmonaler VerAnderungen nach Marknagel osteosynthesen durchzufuhren und die EffektivitAt…

Über das Membranpotential am Vorhof des Meerschweinchenherzens nach Hypothermie / The Membrane Potential of the Cardiac Atrium of Guinea Pigs after H…

1969

Linke Vorhofe von Meerschweinchenherzen wurden prapariert und 30 min in Tyrodelosung mit 5, 4m MK+ /l bei 35° C aquilibriert. Anschliesend wurden die Praparate 90 min bei 4–6° C von einer Tyrodelosung mit 1,35mMK+ /l umspult. Danach wurden die Vorhofe in einer Tyrodelosung mit 21,6 mM K+ /1 bei 35° C rasch wiedererwarmt.

A giant left atrium in a patient with Barlow syndrome, abnormal chordae tendineae, and perforation of the anterior mitral leaflet

2019

Isolation of the left atrial surface from cardiac multi-detector CT images based on marker controlled watershed segmentation

2006

The delineation of left atrium (LA) and pulmonary veins (PVs) anatomy from high resolution images holds importance for atrial fibrillation (AF) investigation and treatment. In this study, a semiautomatic segmentation procedure for LA and PVs inner surface from contrast enhanced CT data was developed. The procedure consists of a three dimensional marker controlled watershed segmentation applied to the external morphological gradient, followed by variable threshold surface extraction from the original intensity image. A preliminary anisotropic non-linear filtering was implemented to improve the S/N ratio of CT images. The performance of segmentation was evaluated on cardiac CT scans of 12 AF …

Die Verteilung von Noradrenalin und Adrenalin im Herzen der Katze, des Kaninchens und der Ratte

1958

The concentration of noradrenaline in different parts of the heart was estimated in cats, rabbits, and rats. In each heart, the concentration of noradrenaline was much higher in the right atrium than in the left atrium and higher in the right ventricle than in the left one.

�ber den Einflu� von Digitoxigenin auf das Aktionspotential des Vorhofs euthyreoter und hyperthyreoter Meerschweinchen bei experimentellen Insuffizie…

1961

An isolierten Herzohren von Meerschweinchen wurden intracellulare Aktionspotentiale unter gleichzeitiger Registrierung der Kontraktionen abgeleitet. Untersucht wurde der Einflus des Digitoxigenins nach Barbituratschadigung und unter Calciummangel bei euthyreoten und hyperthyreoten Tieren.

Influence of intracellular sodium concentration on calcium influx in isolated guinea pig auricles.

1969

Pompei, Casa di Sallustio (Regio VI 2, 4): 2. Statuetta di Eracle con la cerva cerinite; 3. Vasca marmorea; 4. Monopodio con erma barbata; 5. Tavola;…

2019

Si presentano i rinvenimenti più significativi dagli scavi di S.M. la Regina Carolina di Borbone nella domus pompeiana poi divenuta nota come Casa di Sallustio: arredi marmorei e scultorei (sia in marmo che in bronzo) che consentono di ricostruire, in particolare, l'allestimento ricercato dell'atrio nella risistemazione augustea della domus