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Diagnostic errors

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https://www.readbyqxmd.com/read/28316873/nonholonomic-closed-loop-velocity-control-of-a-soft-tethered-magnetic-capsule-endoscope
#1
Addisu Z Taddese, Piotr R Slawinski, Keith L Obstein, Pietro Valdastri
In this paper, we demonstrate velocity-level closed-loop control of a tethered magnetic capsule endoscope that is actuated via serial manipulator with a permanent magnet at its end-effector. Closed-loop control (2 degrees-of-freedom in position, and 2 in orientation) is made possible with the use of a real-time magnetic localization algorithm that utilizes the actuating magnetic field and thus does not require additional hardware. Velocity control is implemented to create smooth motion that is clinically necessary for colorectal cancer diagnostics...
October 2016: Proceedings of the ... IEEE/RSJ International Conference on Intelligent Robots and Systems
https://www.readbyqxmd.com/read/28306349/utility-of-critical-items-within-the-recognition-memory-test-and-word-choice-test
#2
Laszlo A Erdodi, Bradley T Tyson, Christopher A Abeare, Brandon G Zuccato, Jaspreet K Rai, Kristian R Seke, Sanya Sagar, Robert M Roth
This study was designed to examine the clinical utility of critical items within the Recognition Memory Test (RMT) and the Word Choice Test (WCT). Archival data were collected from a mixed clinical sample of 202 patients clinically referred for neuropsychological testing (54.5% male; mean age = 45.3 years; mean level of education = 13.9 years). The credibility of a given response set was psychometrically defined using three separate composite measures, each of which was based on multiple independent performance validity indicators...
March 17, 2017: Applied Neuropsychology. Adult
https://www.readbyqxmd.com/read/28304074/relative-frequency-and-estimated-minimal-frequency-of-lysosomal-storage-diseases-in-brazil-report-from-a-reference-laboratory
#3
Roberto Giugliani, Andressa Federhen, Kristiane Michelin-Tirelli, Mariluce Riegel, Maira Burin
Lysosomal storage diseases (LSDs) comprise a heterogeneous group of more than 50 genetic conditions of inborn errors of metabolism (IEM) caused by a defect in lysosomal function. Although there are screening tests for some of these conditions, diagnosis usually depends on specific enzyme assays, which are only available in a few laboratories around the world. A pioneer facility for the diagnosis of IEM and LSDs was established in the South of Brazil in 1982 and has served as a reference service since then. Over the past 34 years, samples from 72,797 patients were referred for investigation of IEM, and 3,211 were confirmed as having an LSD (4...
March 16, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28303211/real-time-three-dimensional-echocardiography-characterization-of-cardiac-anatomy-and-function-current-clinical-applications-and-literature-review-update
#4
REVIEW
Omar Velasco, Morgan Q Beckett, Aaron W James, Megan N Loehr, Taylor G Lewis, Tahmin Hassan, Rajesh Janardhanan
Our review of real-time three-dimensional echocardiography (RT3DE) discusses the diagnostic utility of RT3DE and provides a comparison with two-dimensional echocardiography (2DE) in clinical cardiology. A Pubmed literature search on RT3DE was performed using the following key words: transthoracic, two-dimensional, three-dimensional, real-time, and left ventricular (LV) function. Articles included perspective clinical studies and meta-analyses in the English language, and focused on the role of RT3DE in human subjects...
2017: BioResearch Open Access
https://www.readbyqxmd.com/read/28301193/an-illustration-of-the-effects-of-fluctuations-in-test-information-on-measurement-error-the-attenuation-of-effect-sizes-and-diagnostic-reliability
#5
Brian P O'Connor
Measurement precision often fluctuates across latent trait continuums. Plots of test information are typically provided in item response theory (IRT) investigations, but the numerical values for test information are not readily interpretable. This article draws attention to the important, nonlinear relationships between test information, location-specific standard errors of measurement, and location-specific reliability. It provides a method for examining the attenuation in effect sizes (correlations) that is caused by fluctuating levels of measurement error...
March 16, 2017: Psychological Assessment
https://www.readbyqxmd.com/read/28297357/correction-of-nonuniformity-error-of-gafchromic-ebt2-and-ebt3
#6
Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Kouichi Yabunaka
This study investigates an X-ray dose measurement method for computed tomography using Gafchromic films. Nonuniformity of the active layer is a major problem in Gafchromic films. In radiotherapy, nonuniformity error is reduced by applying the double-exposure technique, but this is impractical in diagnostic radiology because of the heel effect. Therefore, we propose replacing the X-rays in the double-exposure technique with ultraviolet (UV)-A irradiation of Gafchromic EBT2 and EBT3. To improve the reproducibility of the scan position, Gafchromic EBT2 and EBT3 films were attached to a 3-mm-thick acrylic plate...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297339/deformable-image-registration-and-interobserver-variation-in-contour-propagation-for-radiation-therapy-planning
#7
Adam C Riegel, Jeffrey G Antone, Honglai Zhang, Prachi Jain, Jagdeep Raince, Anthony Rea, Angelo M Bergamo, Ajay Kapur, Louis Potters
Deformable image registration (DIR) and interobserver variation inevitably introduce uncertainty into the treatment planning process. The purpose of the current work was to measure deformable image registration (DIR) errors and interobserver variability for regions of interest (ROIs) in the head and neck and pelvic regions. Measured uncertainties were combined to examine planning margin adequacy for contours propagated for adaptive therapy and to assess the trade-off of DIR and interobserver uncertainty in atlas-based automatic segmentation...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296202/dna-methylation-imprinting-errors-in-spermatogenic-cells-from-maturation-arrest-azoospermic-patients
#8
P I Marques, S Fernandes, F Carvalho, A Barros, M Sousa, C J Marques
Imprinting errors have been described in spermatozoa from infertile patients with oligozoospermia and azoospermia. However, little is known about methylation of imprinted genes in other spermatogenic cells from azoospermic patients. Therefore, we aimed to evaluate the methylation status of single CpGs located in the differentially methylated regions (DMRs) of two imprinted genes, one paternally (H19) and one maternally (MEST) methylated, in primary spermatocytes of azoospermic patients presenting complete (MAc, n = 7) and incomplete (MAi, n = 8) maturation arrest, as well as in other spermatogenic cells from MAi patients that presented focus of complete spermatogenesis in some seminiferous tubules...
March 10, 2017: Andrology
https://www.readbyqxmd.com/read/28291281/bristande-initial-handl%C3%A3-ggning-vanligast-vid-missad-h%C3%A3-ftfraktur-fel-vid-anamnes-status-eller-r%C3%A3-ntgen-orsakar-de-flesta-fall-enligt-retrospektiv-kohortstudie
#9
Thomas Fridén, Niklas Tour, Åke Andrén-Sandberg
Failing primary clinical investigation is common in missed hip fractures Diagnostic errors in 43 patients with hip fracture handled by the Swedish Health and Social Care Inspectorate were analyzed. Diagnostic errors were most likely a consequence of insufficient initial history, examination and/or radiologic examination. The most common isolated cause was delayed examination by a physician outside of a hospital setting. A substantial number of diagnostic errors were related to the radiological examination itself...
March 14, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28291280/bilddiagnostik-inget-facit-vid-diagnos-av-appendicit-st%C3%A3-rre-acceptans-i-sjukv%C3%A3-rd-%C3%A3-n-hos-lekm%C3%A3-n-f%C3%A3-r-att-diagnosen-kan-vara-sv%C3%A3-r
#10
Thomas Fridén, Hannes Hegmar, Åke Andrén-Sandberg
Diagnostic errors in 49 patients with appendicitis handled by the Swedish Health and Social Care Inspectorate were analyzed. Diagnostic errors were more common in young or old patients, and among patients with atypical symptoms. Adjunct diagnostic tools, such as computerized tomography and/or ultrasound examination, also have limitations as regards diagnostic precision, and should therefore not be seen as golden standard. Increased individual knowledge, and not systems factors or safety culture, appears to be a suitable remedy against diagnostic errors...
March 14, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28291278/missad-hj%C3%A3-rtinfarkt-var-ofta-relaterad-till-atypisk-anamnes-systematisk-genomg%C3%A3-ng-av-bakomliggande-orsaker-till-anm%C3%A3-lda-fall-av-felaktig-diagnostik-vid-akut-hj%C3%A3-rtinfarkt
#11
Thomas Fridén, Kevin Jangali, Jesper Persson, Åke Andrén-Sandberg
Systematic analysis of diagnostic errors in patients with myocardial infarction handled by the Swedish Health and Social Care Inspectorate​ Diagnostic errors in 51 patients with myocardial infarction handled by the Swedish Health and Social Care Inspectorate​ were analyzed. In more than half of the cases, the diagnostic errors occurred in health-care outside of hospitals. Diagnostic errors were more common when patients presented atypical symptoms, but atypical symptoms were equally common in male and female patients...
March 14, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28291277/diagnostiska-fel-och-misstag-%C3%A3-r-vanliga-och-sv%C3%A3-ra-att-m%C3%A3-ta
#12
Anders von Heijne
Diagnostic errors are prevalent and hard to measure Diagnostic errors are prevalent in all aspects of healthcare and a common cause of adverse events. They are often the result of multifactorial events, where there is a complex interplay between cognitive factors, system factors and lack of adequate knowledge. The generic, iterative diagnostic process, with abductive, deductive and inductive components supported by tests and the physical exam, leads to a correct diagnosis for the great majority of patients, but can be derailed by suboptimal thinking, lack of adequate information and external factors such as stress and work overload...
March 13, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28291275/dominerar-lex-maria-fallen-inom-prim%C3%A3-rv%C3%A3-rd-och-akutsjukv%C3%A3-rd-bra-teamarbete-tre-regeln-kontrollfr%C3%A3-gor-och-b%C3%A3-ttre-tr%C3%A3-ning-i-diagnostik-%C3%A3-r-n%C3%A3-gra-%C3%A3-tg%C3%A3-rder-f%C3%A3-r-att-minska-risken-f%C3%A3-r-fel
#13
Rita Fernholm, Per Björgell
Diagnostic errors in primary care and in the emergency departments Between 40 and 50 percent (2015) of issues dealt with by the supervisory authorities (lex Maria-issues) from primary care and from acute/emergency departments deal with diagnostic errors. Here, we present underlying issues such as systemic issues, patient related issues and doctor related issues that are more specific in primary care and acute/emergency departments. Finally, we briefly present possible actions to reduce the risk of diagnostic errors...
March 14, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28291195/-optic-nerve-pathology-in-the-structure-of-diagnostic-errors-inpatients-referred-for-cataract-surgery
#14
V V Egorov, N V Savchenko, E L Sorokin, O V Danilov
AIM: to study the frequency of misdiagnosis of cataract in patients with optic nerve pathology or amblyopia and to identify its main causes. MATERIAL AND METHODS: The study enrolled 381 patients (381 eyes) wrongly diagnosed with cataract. A standard set of eye tests was performed. In-depth examination of the macular area was done through biomicroscopy with contactless aspheric lenses of 60 and 90 D. Part of the patients underwent optical coherence tomography and static perimetry as well as examination of electrical sensitivity threshold and electrical lability of the optic nerve...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28290581/deconvolution-of-heterogeneous-wound-tissue-samples-into-relative-macrophage-phenotype-composition-via-models-based-on-gene-expression
#15
Nicole M Ferraro, Will Dampier, Michael S Weingarten, Kara L Spiller
Macrophages, the primary cell of the innate immune system, act on a spectrum of phenotypes that correspond to diverse functions. Dysregulation of macrophage phenotype is associated with many diseases. In particular, defective transition from pro-inflammatory (M1) to anti-inflammatory (M2) behavior has been implicated as a potential source of sustained inflammation that prevents healing of chronic wounds such as diabetic ulcers. In order to design effective treatments, an understanding of the relative presence of macrophage phenotypes during tissue repair is necessary...
March 14, 2017: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/28290478/systematic-errors-in-detecting-biased-agonism-analysis-of-current-methods-and-development-of-a-new-model-free-approach
#16
H Ongun Onaran, Caterina Ambrosio, Özlem Uğur, Erzsebet Madaras Koncz, Maria Cristina Grò, Vanessa Vezzi, Sudarshan Rajagopal, Tommaso Costa
Discovering biased agonists requires a method that can reliably distinguish the bias in signalling due to unbalanced activation of diverse transduction proteins from that of differential amplification inherent to the system being studied, which invariably results from the non-linear nature of biological signalling networks and their measurement. We have systematically compared the performance of seven methods of bias diagnostics, all of which are based on the analysis of concentration-response curves of ligands according to classical receptor theory...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28288853/establishing-evidence-based-thresholds-and-laboratory-practices-to-reduce-inappropriate-treatment-of-pseudohyperkalemia
#17
Pratistha Ranjitkar, Dina N Greene, Geoffrey S Baird, Andrew N Hoofnagle, Patrick C Mathias
BACKGROUND: Unrecognized pseudohyperkalemia (PHK), defined as an artificial increase in measured potassium concentration, due to thrombocytosis and leukocytosis can lead to inappropriate patient treatment. Understanding the laboratory and patient characteristics that increase risk of PHK is key to preventing diagnostic errors. METHODS: Serum/plasma potassium results collected at 2 laboratories over 4years were selected based on blood cell counts collected within 24h and whole blood potassium concentrations determined within 2h of the serum/plasma sample...
March 10, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28284511/permanent-prostate-brachytherapy-pubic-arch-evaluation-with-diagnostic-mri
#18
Geoffrey V Martin, Thomas J Pugh, Usama Mahmood, Rajat J Kudchadker, Jihong Wang, Teresa L Bruno, Tharakeswara Bathala, Steven J Frank
PURPOSE: Pubic arch interference (PAI), when it occurs, is often a limiting factor for patients pursuing brachytherapy treatment of prostate cancer. Pre-brachytherapy pubic arch evaluation is often performed by CT or transrectal ultrasound (TRUS), but MRI has increasingly replaced these modalities for prostate cancer evaluation. The purpose of this study was to determine if staging MRI could be used to evaluate PAI and compare it with these other imaging methods. METHODS AND MATERIALS: Forty-one consecutive patients undergoing brachytherapy evaluation had pelvic MRI-, CT-, and TRUS-based brachytherapy simulation...
March 8, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28279782/a-prospective-study-investigating-the-impact-of-multiparametric-mri-in-biopsy-na%C3%A3-ve-patients-with-clinically-suspected-prostate-cancer-the-prokomb-study
#19
Alexander D J Baur, Thomas Henkel, Manfred Johannsen, Thomas Speck, Lothar Weißbach, Bernd Hamm, Frank König
BACKGROUND: Patients with suspected prostate cancer (PCa) undergo systematic transrectal ultrasound (TRUS)-guided biopsy of the prostate in order to verify or rule out PCa. However, TRUS-guided biopsy is error-prone resulting in underdetection of clinically significant cancers as well as diagnosis of clinically insignificant cancers. Multiparametric MRI (mpMRI) might improve this diagnostic pathway and help to avoid unnecessary biopsies. DESIGN AND METHODS: The PROKOMB (Prostata - Kooperatives MRT-Projekt Berlin) study is a prospective two-arm multicentre study designed to evaluate the potential role of mpMRI as a triage test before biopsy...
March 6, 2017: Contemporary Clinical Trials
https://www.readbyqxmd.com/read/28276725/accuracy-diagrams-a-novel-way-to-illustrate-uncertainty-of-estimated-gfr
#20
Jonas Björk, Anders Grubb, Gunnar Sterner, Sten-Erik Bäck, Ulf Nyman
Most studies that validate GFR equations present accuracy results stratified by measured GFR (mGFR; diagnostic correctness) or by estimated GFR (eGFR; diagnostic predictiveness) only, without a clear distinction in interpretation. The accuracy of a GFR equation is normally reported in percent (e.g. P30), but is often misinterpreted when stratified by eGFR. The aim of the study was to develop new accuracy measures and diagrams that allow straightforward interpretations and illustrations of the uncertainty in eGFR in clinical practice...
May 2017: Scandinavian Journal of Clinical and Laboratory Investigation
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