Determination of heterocyclic aromatic amines in ashes from biomass burning by UHPLC-MS/MS after ultrasound-assisted dispersive solid-liquid microextraction.
Determination of heterocyclic aromatic amines in ashes from biomass burning by UHPLC-MS/MS after ultrasound-assisted dispersive solid-liquid microextraction. Talanta. 2020 Jan 01;206:120182 Authors: Guiñez M, Canales R, Talio C, Gómez D, Smichowski P Abstract A simple, rapid and efficient methodology was developed for the extraction and determination of heterocyclic aromatic amines (HAAs) in cigarette and forest fire ash samples based on a novel Ultrasound-Assisted Dispersive Solid-liquid Microextraction (UA-DSLME) coupled to polyurethane foam (PUF) mini-column as a clean-up strategy and on-line determination by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The optimal working conditions were found by (i) application of two-level full factorial designs and (ii) implementation of a response surface methodology based on the second-order design as central composite designs. Under optimal experimental conditions, good linearity was obtained for concentrations ranging from 8.3 to 500 ng g-1, with correlation coefficients (r2) varying from 0.995 to 0.999 for all HAAs investigated. The limits of detection and quantification resulted to be between 2.1 and 10.7 ng g-1 and 8.3-16.9 ng g-1, respectively. The recoveries from 92.2 to 100.6% were reached and the relative standard deviations (RSDs) were lower than 9.2%. The developed method was successfully applied to the determination of HAAs in ashes generated by cigarette and f...
RESUMO Objetivo: Avaliar a concord ância entre médicos intensivistas que receberam treinamento semelhante para utilização do ultrassom pulmonar à beira do leito, na identificação das linhas B pulmonares visualizadas em tempo real, a fim de verificar a reprodutibilidade do método. Métodos: Foram analisados 67 pacientes que a presentaram alguma piora ventilatória identificada nas últimas 12 horas da realização do ultrassom pulmonar, no período de novembro de 2016 a março de 2017, estando todos internados em um centro de te...
To describe three different subtypes of dysmorphic uteri identified using 3D ultrasound and hysteroscopy.
The aim of this video is to demonstrate the use of laparoscopic ultrasound guidance during hysteroscopic resection of a congenital uterine and vaginal septum.
This video demonstrates a laparoscopic assisted transverse abdominis plane (TAP) block as an alternative to the traditional anesthesiology-driven ultrasound-guided TAP block to reduce postoperative pain.
To establish the long-term improvement in health-related quality of life and work productivity after use of ultrasound-guided transcervical, intrauterine radiofrequency (RF) ablation in the treatment of symptomatic uterine fibroids.
To compare the long-term outcome of laparoscopic myomectomy with MR-guided focused ultrasound (MRgFUS) for symptomatic uterine fibroids.
1) Evaluate intraoperative and near-term safety outcomes following laparoscopic radiofrequency ablation of fibroids (Lap-RFA) performed by gynecologic surgeons new to the procedure, using the Acessa ™ system (Acessa Health, Austin, TX, USA). 2) Compare observed complication rates with those from the pivotal study.
To externally and temporally validate the Ultrasound Based Endometriosis Staging System (UBESS) to predict the level of complexity of laparoscopic surgery for endometriosis.
Pouch of Douglas (POD) obliteration can be predicted with a high degree of certainty in patients with symptoms of endometriosis using transvaginal ultrasound (TVS). Studies on POD obliteration and the sliding sign, as part of an expert-guided deep endometriosis (DE) TVS, have always focused on populations in tertiary care centres with high disease prevalence. Our aim is to determine the prevalence of a negative sliding sign on basic TVS in a general population.
To compare the results of bimanual pelvic exam (BPE) to Pelvic Ultrasound (PU) in symptomatic women. The American College of Physicians reported that 35% of women may experience pain, discomfort, embarrassment, or anxiety during a pelvic exam. This may serve as a barrier for women to seek medical care, which could potentially delay diagnosis. While prior studies show lack of evidence for routine BPE in asymptomatic women, its use in symptomatic women may also be limited.