Search results for "ULTRASOUND"

Vantaggi degli ultrasuoni nel posizionamento di un agocannula nella vena giugulare interna (nuove note di tecnica)

2004

The authors analized the result of 175 central venous ca he- terization CVC. of internal jugular vein performed with the ultrasound guide (US) from January 1998 to October 2002. The average performing time was 45 minutes. 98.2% of success and 4% of complications (one pagal hypotension, one artery puncture, four catheter dislocation, one haeiuatoinai). The US guide CVC is a safe procedure with short performing time, low rate of failures and complications and high rate of success: it is helpful in all patients with vascular anatomical variations, with not visualized or Land marks and with coagulation disorders.

One shoot seldinger central venous catheterization in dialyzed patients

2015

Introduction: Central Venous Catheterization is necessary in uremic patient (before dialysis) and many other conditions. In this study we demonstrated the advantages of ultrasonography to perform the procedure. Materials and methods: 48 uremic patient were submitted to ultrasound-guided central venous catheterization. The procedure was performed following the Seldinger “one shot” technique. Results: The mean operative time was 4 minutes, with a high rate of success (100%) and a low percentage of complications (2%). Conclusion: The ultrasound-guided central venous catheterization is a safe procedure, rapid and easy to perform. The procedure has a low rate of failures and complications and a …

Aluminium nitrate ceramics: a potential UV dosemeter material.

2002

The ceramic material AlN-Y 2 O 3 is proposed as a potential ultraviolet radiation (UVR) dosemeter using optically stimulated luminescence (OSL) and thermally stimulated luminescence (TL). Experimental studies have shown that AlN ceramics exhibit attractive characteristics suitable for practical UV dosimetry applications. The features are: (1) the spectral sensitivity covers the 200-350 nm range, in the UV-B region it is similar to that of human skin; (2) the angular dependence of the incident radiation follows the cosine law; (3) high yields of both UVR-induced OSL and TL signals compared to those of Al 2 O 3 :C; and (4) a large dynamic range TL signal (5 orders of magnitude). Although ther…

FMRI of the Cerebellum: Rostral Paravermal Activation in Tongue and Lip

1998

We investigated with fMRI the cerebellar representation of articulatory vertical movements of the tongue and orofacial muscles in healthy volunteers and its correspondence to the area known to be affected in cerebellar dysarthria. fMRI stimulation is mainly unilateral in agreement with the frequent occurrence of dysarthria in unilateral infarction.

Towards a unified analysis of brain maturation and aging across the entire lifespan: A MRI analysis

2017

Previous literature about the structural characterization of the human cerebellum is related to the context of a specific pathology or focused in a restricted age range. In fact, studies about the cerebellum maturation across the lifespan are scarce and most of them considered the cerebellum as a whole without investigating each lobule. This lack of study can be explained by the lack of both accurate segmentation methods and data availability. Fortunately, during the last years, several cerebellum segmentation methods have been developed and many databases comprising subjects of different ages have been made publically available. This fact opens an opportunity window to obtain a more extens…

Three-dimensional color power angiography of an aneurysm of the vein of Galen

2000

Darstellung des Blutflusses in den Gebärmutterarterien und im normalen sowie malignen Gebärmuttergewebe mittels einer 2D-Multiphasen-Tagging-Technik

1998

PURPOSE The aim of this pilot study was to evaluate a 2D-STAR technique as a non contrast-enhanced approach to demonstrate the uterine artery and its branches and to assess the cervical uterine blood flow in healthy volunteers and in patients with advanced uterine cervical carcinoma. MATERIALS AND METHODS Seven healthy volunteers (mean age, 29 years) and twenty-two patients (mean age, 52 years) with advanced cancer of the uterine cervix (FIGO IIB-IVA) were prospectively examined by 2D-STAR imaging at different inversion delay times (300 ms-1900 ms) which showed the passage of a blood bolus through normal and malignant tissue of the uterine cervix. RESULTS The uterine artery was well visuali…

EP273 A new integrated pre-surgical diagnostic algorithm to define the local extent of disease in women with cervical cancer

2019

Introduction/Background Survival of patients with cervical cancer is strongly associated with the local extent of the primary disease. For this reason, the new FIGO staging system has given greater importance to instrumental investigations in the pre-surgical evaluation. The objective of this study is to develop an integrated diagnostic algorithm, including ultrasound (US), magnetic resonance imaging (MRI) and clinical examination under anaesthesia (CEUA), to better define the local extent of disease in patients with newly diagnosed cervical cancer, using histology as the referring gold standard. Methodology Patients with biopsy proven cervical cancer submitted to primary surgery from Janua…

Channel Tracking Guidewire and Technique for Retrograde Approach

2020

Evaluation of the collateral circulation is critical for determining the feasibility of the retrograde approach. When assessing collateral channels it is of paramount importance to take time and review the previous angiogram carefully, for multiple potential collateral pathways, as the predominant collateral may change over time prior to the procedure. Careful review of collaterals prior to the procedure can reduce contrast and radiation dose as well as the duration of the procedure.Retrograde access to the distal vessel can be achieved via septal collaterals, epicardial collaterals (atrial channel), or (patent or occluded) coronary bypass grafts. Generally septals are used more often 65–70…

A joint action of deep eutectic solvents and ultrasound to promote Diels−Alder reaction in a sustainable way

2020

The need to reduce environmental impact of chemical processes has induced a surge of attention in the choice of solvent and methodologies to carry them out. In this context, we studied the Diels−Alder reaction using N-ethylmaleimide as dienophile and changing the nature of the diene in deep eutectic solvents (DES) under both conventional heating and ultrasonic activation. DES obtained by the combination of different hydrogen bond acceptors and donors allowed assessing the role played by solvent nature. DES proved suitable solvent media for the target reaction, allowing higher yields and faster reactions compared to conventional organic solvents. The trend of yields, both in silent and under…