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diagnostic test interpretation

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https://www.readbyqxmd.com/read/29688158/prospective-comparison-of-the-diagnostic-accuracy-of-mr-imaging-versus-ct-for-acute-appendicitis
#1
Michael D Repplinger, Perry J Pickhardt, Jessica B Robbins, Douglas R Kitchin, Tim J Ziemlewicz, Scott J Hetzel, Sean K Golden, John B Harringa, Scott B Reeder
Purpose To compare the accuracy of magnetic resonance (MR) imaging with that of computed tomography (CT) for the diagnosis of acute appendicitis in emergency department (ED) patients. Materials and Methods This was an institutional review board-approved, prospective, observational study of ED patients at an academic medical center (February 2012 to August 2014). Eligible patients were nonpregnant and 12- year-old or older patients in whom a CT study had been ordered for evaluation for appendicitis. After informed consent was obtained, CT and MR imaging (with non-contrast material-enhanced, diffusion-weighted, and intravenous contrast-enhanced sequences) were performed in tandem, and the images were subsequently retrospectively interpreted in random order by three abdominal radiologists who were blinded to the patients' clinical outcomes...
April 24, 2018: Radiology
https://www.readbyqxmd.com/read/29686505/a-new-diagnostic-tool-for-rapid-and-accurate-detection-of-mycobacterium-tuberculosis
#2
Ali Nour-Neamatollahi, Seyed Davar Siadat, Shamsi Yari, Alireza Hadizadeh Tasbiti, Nayereh Ebrahimzadeh, Farzam Vaziri, Abolfazl Fateh, Morteza Ghazanfari, Farid Abdolrahimi, Shahin Pourazar, Ahmadreza Bahrmand
Mycobacterium tuberculosis , acid fast bacilli from the family of Mycobacteriaceae , is the causative agent of most cases of tuberculosis. Tuberculosis, as a communicable disease, remains a serious public health threat, killing more than one million people globally every year. Primary diagnosis of tuberculosis bacilli (TB) relies mainly on microscopic detection of acid fast bacilli (AFB), but the method suffers from low sensitivity and the results largely depend on the technician's skill. New diagnostic tools are necessary to be introduced for rapid and accurate detection of the bacilli in sputum samples...
March 2018: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/29682293/methodological-aspects-of-serosurveillance-in-resource-poor-settings
#3
Susanna Sternberg Lewerin, Cecilia Wolff, Charles Masembe, Karl Ståhl, Sofia Boqvist, Mikael Andersson Franko
Animal production is important for the agricultural economy in low-income countries, but is threatened by infectious diseases. Serosurveys are conducted for different reasons such as disease detection, risk factor studies, disease monitoring and establishing disease-free status. Most reports on such serosurveys include some discussion about methodological constraints but still, by necessity, rely on serological results for case definition. This study uses a cross-sectional serosurvey for foot-and-mouth disease (FMD), Rift Valley fever (RVF) and contagious bovine pleuropneumonia (CBPP) in cattle in three districts in Western Uganda to illustrate the limitations of this approach, addressing the questions of what flaws can be expected in sampling and diagnostics and how these influence the results...
2018: Veterinary Record Open
https://www.readbyqxmd.com/read/29681962/myocardial-perfusion-scintigraphy-interpretation-of-gated-imaging-part-2
#4
REVIEW
Monika Z Czaja, Zbigniew Wygoda, Agata Duszańska, Dominik Szczerba, Jan Głowacki, Mariusz Gąsior, Jarosław P Wasilewski
The first part of the review describes the basic aspects of interpreting myocardial perfusion defects in single photon emission computed tomography (SPECT) scintigraphy. It also presents indications for invasive diagnostics based on stress perfusion defects. This article provides basic information concerning the interpretation of gated SPECT imaging, including such parameters as left ventricular wall motion and thickening as well as left ventricular wall systolic and diastolic function. Gated examination combined with the assessment of myocardial perfusion reduces the rate of false positives results of myocardial perfusion scintigraphy in perfusion tests, additionally providing data on left ventricular systolic and diastolic function...
March 2018: Kardiochirurgia i Torakochirurgia Polska, Polish Journal of Cardio-Thoracic Surgery
https://www.readbyqxmd.com/read/29678229/the-use-of-serological-tests-in-combination-with-the-intradermal-tuberculin-test-maximizes-the-detection-of-tuberculosis-infected-goats
#5
Javier Bezos, Álvaro Roy, José Antonio Infantes-Lorenzo, Isabel González, Ángel Venteo, Beatriz Romero, Anna Grau, Olga Mínguez, Lucas Domínguez, Lucía de Juan
The diagnosis of tuberculosis (TB) in goats is based mainly on the single and comparative intradermal tuberculin (SIT and CIT) tests and, exceptionally, on the interferon-gamma (IFN-γ) assay, however they are not perfect in terms of sensitivity and specificity. Nevertheless, various serological assays that provide a potential cost-effective approach for the control of TB are also available or under development, and a variety of results have been reported regarding the ability of these tests to detect infected animals, particularly in the early stages of infection...
May 2018: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/29677066/agreement-analysis-what-he-said-she-said-versus-you-said
#6
Thomas R Vetter, Patrick Schober
Correlation and agreement are 2 concepts that are widely applied in the medical literature and clinical practice to assess for the presence and strength of an association. However, because correlation and agreement are conceptually distinct, they require the use of different statistics. Agreement is a concept that is closely related to but fundamentally different from and often confused with correlation. The idea of agreement refers to the notion of reproducibility of clinical evaluations or biomedical measurements...
April 17, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29672524/point-of-care-tests-for-syphilis-and-yaws-in-a-low-income-setting-a-qualitative-study-of-healthcare-worker-and-patient-experiences
#7
Michael Marks, Tommy Esau, Rowena Asugeni, Relmah Harrington, Jason Diau, Hilary Toloka, James Asugeni, Eimhin Ansbro, Anthony W Solomon, David Maclaren, Michelle Redman-Maclaren, David C W Mabey
INTRODUCTION: The human treponematoses comprise venereal syphilis and the three non-venereal or endemic treponematoses yaws, bejel, and pinta. Serological assays remain the most common diagnostic method for all treponemal infections. Point-of-care tests (POCTs) for syphilis and yaws allow testing without further development of infrastructure in populations where routine laboratory facilities are not available. Alongside the test's performance characteristics assessed through diagnostic evaluation, it is important to consider broader issues when rolling out a POCT...
April 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29672309/a-web-based-education-program-for-colorectal-lesion-diagnosis-with-narrow-band-imaging-classification
#8
Hiroyuki Aihara, Nitin Kumar, Christopher C Thompson
BACKGROUND: An education system for narrow band imaging (NBI) interpretation requires sufficient exposure to key features. However, access to didactic lectures by experienced teachers is limited in the United States. AIM: To develop and assess the effectiveness of a colorectal lesion identification tutorial. METHODS: In the image analysis pretest, subjects including 9 experts and 8 trainees interpreted 50 white light (WL) and 50 NBI images of colorectal lesions...
April 19, 2018: Digestion
https://www.readbyqxmd.com/read/29671903/a-review-of-mycoplasma-diagnostics-in-cattle
#9
REVIEW
Alysia M Parker, Paul A Sheehy, Mark S Hazelton, Katrina L Bosward, John K House
Mycoplasma species have a global distribution causing serious diseases in cattle worldwide including mastitis, arthritis, pneumonia, otitis media and reproductive disorders. Mycoplasma species are typically highly contagious, are capable of causing severe disease, and are difficult infections to resolve requiring rapid and accurate diagnosis to prevent and control disease outbreaks. This review discusses the development and use of different diagnostic methods to identify Mycoplasma species relevant to cattle, with a particular focus on Mycoplasma bovis...
April 19, 2018: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/29670403/variation-of-diagnostic-performance-of-fecal-immunochemical-testing-for-hemoglobin-by-sex-and-age-results-from-a-large-screening-cohort
#10
Hermann Brenner, Jing Qian, Simone Werner
Objective: Fecal immunochemical tests (FITs) for hemoglobin in stool are increasingly used for colorectal cancer screening. Reported sensitivities and specificities have strongly varied between studies, but it is unclear to what extent such variation reflects differences between tests or between study population characteristics. We aimed to evaluate the key parameters of FIT performance for detecting advanced neoplasia (AN) according to sex and age. Methods: Sex- and age-specific sensitivity, specificity, positive predictive values (PPVs) and negative predictive values (NPVs) for detecting AN of a quantitative FIT (FOB Gold®) were evaluated among 3211 men and women aged 50-79 years who underwent screening colonoscopy in Germany...
2018: Clinical Epidemiology
https://www.readbyqxmd.com/read/29665853/microsatellite-instability-in-prostate-cancer-by-pcr-or-next-generation-sequencing
#11
Jennifer A Hempelmann, Christina M Lockwood, Eric Q Konnick, Michael T Schweizer, Emmanuel S Antonarakis, Tamara L Lotan, Bruce Montgomery, Peter S Nelson, Nola Klemfuss, Stephen J Salipante, Colin C Pritchard
BACKGROUND: Microsatellite instability (MSI) is now being used as a sole biomarker to guide immunotherapy treatment for men with advanced prostate cancer. Yet current molecular diagnostic tests for MSI have not been evaluated for use in prostate cancer. METHODS: We evaluated two next-generation sequencing (NGS) MSI-detection methods, MSIplus (18 markers) and MSI by Large Panel NGS (> 60 markers), and compared the performance of each NGS method to the most widely used 5-marker MSI-PCR detection system...
April 17, 2018: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/29661795/machine-learning-analysis-of-left-ventricular-function-to-characterize-heart-failure-with-preserved-ejection-fraction
#12
Sergio Sanchez-Martinez, Nicolas Duchateau, Tamas Erdei, Gabor Kunszt, Svend Aakhus, Anna Degiovanni, Paolo Marino, Erberto Carluccio, Gemma Piella, Alan G Fraser, Bart H Bijnens
BACKGROUND: Current diagnosis of heart failure with preserved ejection fraction (HFpEF) is suboptimal. We tested the hypothesis that comprehensive machine learning (ML) of left ventricular function at rest and exercise objectively captures differences between HFpEF and healthy subjects. METHODS AND RESULTS: One hundred fifty-six subjects aged >60 years (72 HFpEF+33 healthy for the initial analyses; 24 hypertensive+27 breathless for independent evaluation) underwent stress echocardiography, in the MEDIA study (Metabolic Road to Diastolic Heart Failure)...
April 2018: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29661713/review-with-novel-markers-facilitates-precise-categorization-of-41-cases-of-diagnostically-challenging-undifferentiated-small-round-cell-tumors-a-clinicopathologic-immunophenotypic-and-molecular-analysis
#13
Isidro Machado, Akihiko Yoshida, María Gema Nieto Morales, Lucas Faria Abrahão-Machado, Samuel Navarro, Julia Cruz, Javier Lavernia, Antonina Parafioriti, Piero Picci, Antonio Llombart-Bosch
BACKGROUND: Despite extensive immunohistochemical (IHC) and molecular studies combined with morphologic findings, a group of round/ovoid cell tumors histologically similar to Ewing sarcomas (ES) but lacking EWSR1-rearrangements may remain unclassifiable. DESIGN: We retrospectively analyzed 41 Ewing-like tumors (formalin-fixed, paraffin-embedded) previously determined as negative or non-informative for EWSR1-rearrangements by FISH and/or RT-PCR. A new histopathology revision and additional IHC and molecular analyses were carried out in order to investigate whether additional IHC and/or molecular testing in combination with the morphological findings may help in reaching a definitive diagnosis...
November 29, 2017: Annals of Diagnostic Pathology
https://www.readbyqxmd.com/read/29660952/objective-motor-assessment-for-personalized-rehabilitation-of-upper-extremity-in-brain-injury-patients
#14
Mailin Adriana Villán-Villán, Rodrigo Pérez-Rodríguez, Cristina Martín, Patricia Sánchez-González, Ignasi Soriano, Eloy Opisso, Dra M Elena Hernando, José María Tormos, Josep Medina, Enrique J Gómez
BACKGROUND: The increasing number of patients with acquired brain injury and the current subjectivity of the conventional upper extremity (UE) assessment tests require new objective assessment techniques. OBJECTIVE: This research proposes a novel objective motor assessment (OMA) methodology based on the Fugl-Meyer assessment (FMA). The goals are to automatically calculate the objective scores (OSs) of FMA-UE movements (as well as a global OS) and to interpret the estimated OSs...
April 7, 2018: NeuroRehabilitation
https://www.readbyqxmd.com/read/29658382/the-impact-of-digital-technologies-on-point-of-care-diagnostics-in-resource-limited-settings
#15
Natasha Gous, Debrah I Boeras, Ben Cheng, Jeff Takle, Brad Cunningham, Rosanna W Peeling
Simple, rapid tests that can be used at the point-of-care (POC) can improve access to diagnostic services and overall patient management in resource-limited settings where laboratory infrastructure is limited. Implementation of POC tests places tremendous strain on already fragile health systems as the demand for training, supply management and quality assurance are amplified. Digital health has a major role to play in ensuring effective delivery and management of POC testing services. Area covered: The ability to digitise laboratory and POC platforms, including lateral flow rapid diagnostic test results, can standardize the interpretation of results and allows data to be linked to proficiency testing to ensure testing quality, reducing interpretation and transcription errors...
April 2018: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/29651777/cost-effectiveness-of-genome-and-exome-sequencing-in-children-diagnosed-with-autism-spectrum-disorder
#16
Tracy Yuen, Melissa T Carter, Peter Szatmari, Wendy J Ungar
BACKGROUND: Genome (GS) and exome sequencing (ES) could potentially identify pathogenic variants with greater sensitivity than chromosomal microarray (CMA) in autism spectrum disorder (ASD) but are costlier and result interpretation can be uncertain. Study objective was to compare the costs and outcomes of four genetic testing strategies in children with ASD. METHODS: A microsimulation model estimated the outcomes and costs (in societal and public payer perspectives in Ontario, Canada) of four genetic testing strategies: CMA for all, CMA for all followed by ES for those with negative CMA and syndromic features (CMA+ES), ES or GS for all...
April 12, 2018: Applied Health Economics and Health Policy
https://www.readbyqxmd.com/read/29649511/interference-of-carbidopa-and-other-catechols-with-reactions-catalyzed-by-peroxidases
#17
Beata Gąsowska-Bajger, Yuki Nishigaya, Krystyna Hirsz-Wiktorzak, Anna Rybczyńska, Toshimasa Yamazaki, Hubert Wojtasek
BACKGROUND: A number of compounds, including ascorbic acid, catecholamines, flavonoids, p-diphenols and hydrazine derivatives have been reported to interfere with peroxidase-based medical diagnostic tests (Trinder reaction) but the mechanisms of these effects have not been fully elucidated. METHODS: Reactions of bovine myeloperoxidase with o-dianisidine, bovine lactoperoxidase with ABTS and horseradish peroxidase with 4-aminoantipyrine/phenol in the presence of carbidopa, an anti-Parkinsonian drug, and other catechols, including l-dopa, were monitored spectrophotometrically and by measuring hydrogen peroxide consumption...
April 9, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29649263/validation-of-czecanca-czech-cancer-panel-for-clinical-application-for-targeted-ngs-based-analysis-of-hereditary-cancer-syndromes
#18
Jana Soukupova, Petra Zemankova, Klara Lhotova, Marketa Janatova, Marianna Borecka, Lenka Stolarova, Filip Lhota, Lenka Foretova, Eva Machackova, Viktor Stranecky, Spiros Tavandzis, Petra Kleiblova, Michal Vocka, Hana Hartmannova, Katerina Hodanova, Stanislav Kmoch, Zdenek Kleibl
BACKGROUND: Carriers of mutations in hereditary cancer predisposition genes represent a small but clinically important subgroup of oncology patients. The identification of causal germline mutations determines follow-up management, treatment options and genetic counselling in patients' families. Targeted next-generation sequencing-based analyses using cancer-specific panels in high-risk individuals have been rapidly adopted by diagnostic laboratories. While the use of diagnosis-specific panels is straightforward in typical cases, individuals with unusual phenotypes from families with overlapping criteria require multiple panel testing...
2018: PloS One
https://www.readbyqxmd.com/read/29649256/gene-target-selection-for-loop-mediated-isothermal-amplification-for-rapid-discrimination-of-treponema-pallidum-subspecies
#19
Sascha Knauf, Simone Lüert, David Šmajs, Michal Strouhal, Idrissa S Chuma, Sieghard Frischmann, Mohammed Bakheit
We show proof of concept for gene targets (polA, tprL, and TP_0619) that can be used in loop-mediated isothermal amplification (LAMP) assays to rapidly differentiate infection with any of the three Treponema pallidum subspecies (pallidum (TPA), pertenue (TPE), and endemicum (TEN)) and which are known to infect humans and nonhuman primates (NHPs). Four TPA, six human, and two NHP TPE strains, as well as two human TEN strains were used to establish and validate the LAMP assays. All three LAMP assays were highly specific for the target DNA...
April 12, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29629697/rapid-diagnostic-tests-in-childhood-infections
#20
Ritabrata Kundu
Presumptive treatment of infections often results in irrational antimicrobial use resulting in detrimental spread of drug resistance and untoward side effects. A rapid diagnostic test (RDT) is a test that delivers a result earlier than conventional testing methods employed in the past to identify the offending microorganism. RDTs help in early definitive therapy, reduction in hospital stay and cost, and in degree of morbidity and mortality associated with the infection. To select a proper RDT, one should consider how specific and sensitive the test is...
March 15, 2018: Indian Pediatrics
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