RESUMEN
INTRODUCTION: Three-dimensional rotational angiography (3DRA) has been used in the guidance of various transcatheter therapies including percutaneous pulmonary valve implantation (PPVI). The most recently available 3D image fusion software (VesselNavigator, Philips) extends this technology to use pre-registered computed tomography or magnetic resonance imaging datasets, promising reductions in contrast and radiation exposure along with shorter procedural times. METHODS: In this retrospective review, patients were assigned to three groups according to the mode of imaging guidance: two-dimensional angiography (2DA), 3DRA and VesselNavigator (VN) assisted valve implantation. Patient characteristics and catheterisation data were reviewed with a focus on contrast and radiation exposure, fluoroscopy, and procedural times. RESULTS: Between July 2012 and June 2016, 21 patients underwent PPVI: 8 with 2D guidance, 6 patients with 3DRA and most recently 7 patients with VN assistance. Patents in the VN group received significantly less absolute and weight indexed contrast when compared with those with 2DA or 3DRA guided PPVI. Patients in the 2DA group received a significantly higher total dose area product radiation dose and air kerma in comparison with patients with 3DRA and VN guided intervention. Application of VN resulted in the shortest fluoroscopy time, although not statistically significant, and a significantly shorter study time when compared with 2DA. CONCLUSIONS: Utilisation of pre-intervention image manipulation with VesselNavigator for 3D guidance of PPVI results in a reduction in contrast and radiation exposure and study time as compared with traditional 2D guidance, and contrast usage as compared with 3DRA.
RESUMEN
Topological parameters (Balaban index and electrotopological index) were used as structural parameters in the structure-retention relationships (SRRs). These relationships were found to be statistically valid and useful in the prediction of retention data of polychlorinated biphenyls (PCBs) despite of the temperature program used in the gas chromatographic experiment.
Asunto(s)
Bifenilos Policlorados/química , Cromatografía de Gases , Relación Estructura-ActividadRESUMEN
The purpose of this work was to state the three-dimensional position of the nerve centres of the hypothalamus of the cow. Studies were made on 12 brains of Frisian cattle cows weighing from 320 to 350 kg. The whole length of examined animals' skulls was on an average 51 cm. The following stereotaxic zero planes were taken: 1. a horizontal plane joining an interaurical line and upper edges of eye-sockets, 2. frontal plane runs across an interaurical line perpendicularly to a horizontal plane 3. a sagittal plane is a plane of brain symmetry. The brains were fixed with neutralized formalin, dehydrated in ethyl alcohol, embedded in paraffin and cut into section 15 micrometer thick in 3 planes. The sections were stained by Klüver's and Barrera's method. Basing on microscopic examination of these histological preparations the three-dimensional position of hypothalamus nerve centres of a cow in relation to taken stereotaxic zero planes was stated.
Asunto(s)
Bovinos/anatomía & histología , Hipotálamo/anatomía & histología , Animales , Cefalometría , Femenino , Técnicas EstereotáxicasRESUMEN
Partusisten slow-drop infusions were applied to twelve women in labour with spontaneous increase of the uterus tonus in rest. The preparation was found to lower the tonus in rest and to increase the amplitude of uterus contractions.