Read by QxMD icon Read

Performance validity tests

Madeleine S Durkee, Landon D Nash, Fatemeh Nooshabadi, Jeffrey D Cirillo, Duncan J Maitland, Kristen C Maitland
The rapid development of new optical imaging techniques is dependent on the availability of low-cost, customizable, and easily reproducible standards. By replicating the imaging environment, costly animal experiments to validate a technique may be circumvented. Predicting and optimizing the performance of in vivo and ex vivo imaging techniques requires testing on samples that are optically similar to tissues of interest. Tissue-mimicking optical phantoms provide a standard for evaluation, characterization, or calibration of an optical system...
February 12, 2018: Journal of Visualized Experiments: JoVE
Zakaria Aboulbanine, Naïma El Khayati
The use of phase space in medical linear accelerator Monte Carlo (MC) simulations significantly improves the execution time and leads to results comparable to those obtained from full calculations. The classical representation of phase space stores directly the information of millions of particles, producing bulky files. This paper presents a virtual source model (VSM) based on a reconstruction algorithm, taking as input a compressed file of roughly 800 kb derived from phase space data freely available in the International Atomic Energy Agency (IAEA) database...
March 19, 2018: Physics in Medicine and Biology
Alhassane Diallo, Heike Jacobi, Arron Cook, Robyn Labrum, Alexandra Durr, Alexis Brice, Perrine Charles, Cecilia Marelli, Caterina Mariotti, Lorenzo Nanetti, Marta Panzeri, Maria Rakowicz, Anna Sobanska, Anna Sulek, Tanja Schmitz-Hübsch, Ludger Schöls, Holger Hengel, Bela Melegh, Alessandro Filla, Antonella Antenora, Jon Infante, José Berciano, Bart P van de Warrenburg, Dagmar Timmann, Sylvia Boesch, Massimo Pandolfo, Jörg B Schulz, Peter Bauer, Paola Giunti, Jun-Suk Kang, Thomas Klockgether, Sophie Tezenas du Montcel
BACKGROUND: Spinocerebellar ataxias are dominantly inherited progressive ataxia disorders that can lead to premature death. We aimed to study the overall survival of patients with the most common spinocerebellar ataxias (SCA1, SCA2, SCA3, and SCA6) and to identify the strongest contributing predictors that affect survival. METHODS: In this longitudinal cohort study (EUROSCA), we enrolled men and women, aged 18 years or older, from 17 ataxia referral centres in ten European countries; participants had positive genetic test results for SCA1, SCA2, SCA3, or SCA6 and progressive, otherwise unexplained, ataxias...
April 2018: Lancet Neurology
Hiroshi Yatsuya, Yuanying Li, Yoshihisa Hirakawa, Atsuhiko Ota, Masaaki Matsunaga, Hilawe Esayas Haregot, Chifa Chiang, Yan Zhang, Koji Tamakoshi, Hideaki Toyoshima, Atsuko Aoyama
BACKGROUND: Relatively little evidence exists for type 2 diabetes mellitus (T2DM) prediction models from long-term follow-up studies in East Asians. This study aims to develop a point-based prediction model for 10-year risk of developing T2DM in middle-aged Japanese men. METHODS: We followed 3,540 male participants of Aichi Workers' Cohort Study, who were aged 35-64 years and were free of diabetes in 2002, until March 31, 2015. Baseline age, body mass index (BMI), smoking status, alcohol consumption, regular exercise, medication for dyslipidemia, diabetes family history, and blood levels of triglycerides (TG), high density lipoprotein cholesterol (HDLC) and fasting blood glucose (FBG) were examined using Cox proportional hazard model...
March 17, 2018: Journal of Epidemiology
Xiao-Li Chen, Hong Pu, Long-Lin Yin, Jun-Ru Li, Zhen-Lin Li, Guang-Wen Chen, Neng-Yi Hou, Hang Li
Purpose: To determine whether gross tumor volume of resectable gastric adenocarcinoma on multidetector computed tomography could predict presence of lymphovascular invasion and T-stages. Results: Gross tumor volume increased with the lymphovascular invasion ( r = 0.426, P < 0.0001) and T stage ( r = 0.656, P < 0.0001). Univariate analysis showed gross tumor volume could predict lymphovascular invasion ( P < 0.0001). Multivariate analyses indicated gross tumor volume as an independent risk factor of lymphovascular invasion ( P = 0...
February 23, 2018: Oncotarget
Ye Chen, SuNing Chen, Jian Zhang, YangMin Wang, Zhengping Jia, Xin Zhang, Xiao Han, Xiuquan Guo, XiaoDi Sun, Chen Shao, Ji Wang, Tian Lan
The current study aimed to identify a comprehensive expression-profile of microRNAs (miRNAs) in expressed prostatic secretion (EPS) collected from healthy men and patients with CP/CPPS (Chronic prostatitis/Chronic pelvic pain syndrome). After clinical screening of 382 participants, 60 healthy men and 59 IIIA CP/CPPS patients with significant pelvic-pain were included into this study from March 2012 to December 2014. High-throughput sequencing was employed to identify characteristic expression-profile of EPS-miRNAs...
February 23, 2018: Oncotarget
Paolo Fattorini, Giorgio Marrubini, Serena Bonin, Barbara Bertoglio, Pierangela Grignani, Elisa Recchia, Paola Pitacco, Francesca Procopio, Carolina Cantoni, Irena Zupanič Pajnič, Solange Sorçaburu-Cigliero, Carlo Previderè
Heat-mediated hydrolysis of DNA is a simple and inexpensive method for producing damaged samples in vitro. Despite heat-mediated DNA hydrolysis is being widely used in forensic and clinical validation procedures, the lack of standardized procedures makes it impossible to compare the intra and inter-laboratory outcomes of the damaging treatments. In this work, a systematic approach to heat induced DNA hydrolysis was performed at 70 °C for 0-18 h to test the role both of the hydrolysis buffer and of the experimental conditions...
March 15, 2018: Analytical Biochemistry
Javad Parvizi, Timothy L Tan, Karan Goswami, Carlos Higuera, Craig Della Valle, Antonia F Chen, Noam Shohat
BACKGROUND: The introduction of the Musculoskeletal Infection Society (MSIS) criteria for periprosthetic joint infection (PJI) in 2011 resulted in improvements in diagnostic confidence and research collaboration. The emergence of new diagnostic tests and the lessons we have learned from the past 7 years using the MSIS definition, prompted us to develop an evidence-based and validated updated version of the criteria. METHODS: This multi-institutional study of patients undergoing revision total joint arthroplasty was conducted at 3 academic centers...
February 26, 2018: Journal of Arthroplasty
Daniel Gutiérrez Sánchez, Antonio I Cuesta-Vargas
PURPOSE: Many measurements have been developed to assess the quality of death (QoD). Among these, the Quality of Dying and Death Questionnaire (QODD) is the most widely studied and best validated. Informal carers and health professionals who care for the patient during their last days of life can complete this assessment tool. The aim of the study is to carry out a cross-cultural adaptation and a psychometric analysis of the QODD for the Spanish population. METHODS: The translation was performed using a double forward and backward method...
April 2018: European Journal of Oncology Nursing: the Official Journal of European Oncology Nursing Society
Wandayi Emmanuel Amlabu, Ishaya Haruna Nock, Naveen Kumar Kaushik, Dinesh Mohanakrishnan, Jyoti Tiwary, Patrick Ahmadu Audu, Musbahu S Abubakar, Dinkar Sahal
The plant kingdom continues to hold great promise for the eradication of Malaria infection following the challenges of insecticide resistance by the vector mosquito, drug resistance by the parasite, and the development of a vaccine still being a mirage. Acalypha wilkesiana Muller Argoviensis, 1866 (family: Euphorbiaceae) leaves have the ethnopharmacological reputation for use as a remedy against dermal microbial infections in Nigeria. Here, we have studied the antiplasmodial potential of the extract of the leaves of this ornamental plant...
March 17, 2018: Parasitology Research
Andreas Martinschek, G Welzel, M Ritter, E Heinrich, C Bolenz, L Trojan
To prospectively evaluate the possible loss of attention among console surgeons performing robotic-assisted procedures using a validated psychological test. The concentration of one console surgeon was assessed before and after 25 robotic-assisted procedures (radical prostatectomies) using the validated d2 attention test (computer-assisted, Hogrefe test systems, Germany). Error frequency, work rate, and accuracy of task performance were evaluated as parameters of the fluctuation in concentration. Data were correlated with clinical parameters, including console times, positive surgical margin rates and the use of a nerve-sparing procedure...
March 17, 2018: Journal of Robotic Surgery
C B Terwee, C A C Prinsen, A Chiarotto, M J Westerman, D L Patrick, J Alonso, L M Bouter, H C W de Vet, L B Mokkink
BACKGROUND: Content validity is the most important measurement property of a patient-reported outcome measure (PROM) and the most challenging to assess. Our aims were to: (1) develop standards for evaluating the quality of PROM development; (2) update the original COSMIN standards for assessing the quality of content validity studies of PROMs; (3) develop criteria for what constitutes good content validity of PROMs, and (4) develop a rating system for summarizing the evidence on a PROM's content validity and grading the quality of the evidence in systematic reviews of PROMs...
March 17, 2018: Quality of Life Research
J Hurtado-Gallego, K Martín-Betancor, I Rodea-Palomares, F Leganés, R Rosal, F Fernández-Piñas
This work describes the construction of two novel self-luminescent bioreporter strains of the cyanobacterium Nostoc sp. PCC 7120 by fusing the promoter region of the sodA and sodB genes (encoding the superoxide dismutases MnSod and FeSod, respectively) to luxCDABE from Photorhabdus luminescens aimed at detecting pollutants that generate reactive oxygen species (ROS), particularly O2 - . Bioreporters were tested against methyl viologen (MV) as the inducer of superoxide anion (O2 - ). Both bioreporters were specific for O2 - and Limits of detection (LODs) and Maximum Permissive Concentrations (MPCs) were calculated: Nostoc sp...
March 3, 2018: Chemosphere
Joris Koetsveld, Nadezhda M Kolyasnikova, Alex Wagemakers, Olga A Stukolova, Dieuwertje Hoornstra, Denis S Sarksyan, Marina G Toporkova, Anna J Henningsson, Dag Hvidsten, Wim Ang, Ram Dessau, Alexander E Platonov, Joppe W Hovius
OBJECTIVES: Borrelia miyamotoi disease (BMD) is an emerging tick-borne disease in the Northern hemisphere. Serodiagnosis by measuring antibodies against glycerophosphodiester-phosphodiesterase (GlpQ) is performed experimentally, but has not been extensively clinically validated. Since we have previously shown the differential expression of antigenic variable major proteins (Vmps) in B. miyamotoi, our aim was to study antibody responses against GlpQ and Vmps in PCR-proven BMD patients and controls...
March 14, 2018: Clinical Microbiology and Infection
Anwar E Ahmed, Hamdan Al-Jahdali, Abeer N Alshukairi, Mody Alaqeel, Salma S Siddiq, Hanan A Alsaab, Ezzeldin A Sakr, Hamed A Alyahya, Munzir M Alandonisi, Alaa T Subedar, Nouf M Aloudah, Salim Baharoon, Majid A Alsalamah, Sameera Al Johani, Mohammed G Alghamdi
BACKGROUND: Rapidly and accurately identifying individuals who are at high risk for Middle East respiratory syndrome coronavirus (MERS-CoV) remains a major challenge for the medical and scientific communities. The aim of this study was to develop and validate a risk prediction model for the screening of suspected cases of MERS-CoV infection in patients who had developed pneumonia. METHODS: A two-center retrospective case-control study was done, including 360 patients with confirmed pneumonia who were evaluated for MERS-CoV infection by Real-time reverse-transcription polymerase chain reaction (rRT-PCR) from September 1, 2012 to June 1, 2016 at King Abdulaziz Medical City in Riyadh (KAMC-R) and King Fahd General Hospital in Jeddah (KFGH-JED)...
March 14, 2018: International Journal of Infectious Diseases: IJID
J Tavakoli, J J Costi
While few studies have improved our understanding of composition and organization of elastic fibres in the inter-lamellar matrix (ILM), its clinical relevance is not fully understood. Moreover, no studies have measured the direct tensile and shear failure and viscoelastic properties of the ILM. Therefore, the aim of this study was, for the first time, to measure the viscoelastic and failure properties of the ILM in both the tension and shear directions of loading. Using an ovine model, isolated ILM samples were stretched to 40% of their initial length at three strain rates of 0...
March 14, 2018: Acta Biomaterialia
James W MacKay, Samantha B L Low, Toby O Smith, Andoni P Toms, Andrew M McCaskie, Fiona J Gilbert
OBJECTIVE: To assess reliability and discriminative validity of cartilage compositional magnetic resonance imaging (MRI) in knee osteoarthritis (OA). DESIGN: The study was carried out per PRISMA recommendations. We searched MEDLINE and EMBASE (1974 - present) for eligible studies. We performed qualitative synthesis of reliability data. Where data from at least 2 discrimination studies were available, we estimated pooled standardized mean difference (SMD) between subjects with and without OA...
March 14, 2018: Osteoarthritis and Cartilage
Reinaldo Uribe-San-Martín, Ethel Ciampi, Roberta Di Giacomo, Macarena Vásquez, Claudia Cárcamo, Jaime Godoy, Giorgio Lo Russo, Laura Tassi
OBJECTIVE: Our aim in this retrospective study was to explore whether corpus callosum atrophy could predict the post-surgical seizure control in patients with temporal lobe epilepsy associated with Hippocampal Sclerosis (HS). METHODS: We used the Corpus Callosum Index (CCI) obtained from best mid-sagittal T2/FLAIR or T1-weighted MRI at two time-points, more than one year apart. CCI has been mainly used in Multiple Sclerosis (MS), but not in epilepsy, so we tested the validity of our results performing a proof of concept cohort, incorporating MS patients with and without epilepsy...
March 3, 2018: Epilepsy Research
Marko Barjaktarović, Milica M Janković, Marija Jeremić, Milovan Matović
Radioiodine therapy in the treatment of differentiated thyroid carcinoma (DTC) is used in clinical practice for the ablation of thyroid residues and/or destruction of tumour tissue. Whole-body scintigraphy for visualization of the spatial 131I distribution performed by a gamma camera (GC) is a standard procedure in DTC patients after application of radioiodine therapy. A common problem is the precise topographic localization of regions where radioiodine is accumulated even in SPECT imaging. SPECT/CT can provide precise topographic localization of regions where radioiodine is accumulated, but it is often unavailable, especially in developing countries because of the high price of the equipment...
March 9, 2018: Computers in Biology and Medicine
Bruno Rossion, Caroline Michel
We report normative data from a large (N = 307) sample of young adult participants tested with a computerized version of the long form of the classical Benton Facial Recognition Test (BFRT; Benton & Van Allen, 1968). The BFRT-c requires participants to match a target face photograph to either one or three of six face photographs presented simultaneously. We found that the percent accuracy on the BFRT-c (81%-83%) was below ceiling yet well above chance level, with little interindividual variance in this typical population sample, two important aspects of a sensitive clinical test...
March 16, 2018: Behavior Research Methods
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"