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https://www.readbyqxmd.com/read/28300375/photon-optimizer-po-prevails-over-progressive-resolution-optimizer-pro-for-vmat-planning-with-or-without-knowledge-based-solution
#1
Fan Jiang, Hao Wu, Haizhen Yue, Fei Jia, Yibao Zhang
The enhanced dosimetric performance of knowledge-based volumetric modulated arc therapy (VMAT) planning might be jointly contributed by the patient-specific optimization objectives, as estimated by the RapidPlan model, and by the potentially improved Photon Optimizer (PO) algorithm than the previous Progressive Resolution Optimizer (PRO) engine. As PO is mandatory for RapidPlan estimation but optional for conventional manual planning, appreciating the two optimizers may provide practical guidelines for the algorithm selection because knowledge-based planning may not replace the current method completely in a short run...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297309/production-review-and-impact-of-technical-quality-control-guidelines-in-a-national-context
#2
Michelle K Nielsen, Kyle E Malkoske, Erika Brown, Kevin Diamond, Normand Frenière, John Grant, Natalie Pomerleau-Dalcourt, Jason Schella, L John Schreiner, Laurent Tantôt, J Eduardo Villarreal-Barajas, Jean-Pierre Bissonnette
A close partnership between the Canadian Partnership for Quality Radiotherapy (CPQR) and the Canadian Organization of Medical Physicist's (COMP) Quality Assurance and Radiation Safety Advisory Committee (QARSAC) has resulted in the development of a suite of Technical Quality Control (TQC) guidelines for radiation treatment equipment; they outline specific performance objectives and criteria that equipment should meet in order to assure an acceptable level of radiation treatment quality. The adopted framework for the development and maintenance of the TQCs ensures the guidelines incorporate input from the medical physics community during development, measures the workload required to perform the QC tests outlined in each TQC, and remain relevant (i...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28279931/quantitative-chiral-and-achiral-determination-of-ketamine-and-its-metabolites-by-lc-ms-ms-in-human-serum-urine-and-fecal-samples
#3
Mahmoud Hasan, Robert Hofstetter, Georg M Fassauer, Andreas Link, Werner Siegmund, Stefan Oswald
Ketamine (KET) is a widely used anesthetic drug which is metabolized by CYP450 enzymes to norketamine (n-KET), dehydronorketamine (DHNK), hydroxynorketamine (HNK) and hydroxyketamine (HK). Ketamine is a chiral compound and S-ketamine is known to be the more potent enantiomer. Here, we present the development and validation of three LC-MS/MS assays; the first for the quantification of racemic KET, n-KET and DHNK in human serum, urine and feces; the second for the separation and quantification of the S- and R-enantiomers of KET, n-KET and DHNK, and the third for separation and quantification of 2S,6S-hydroxynorketamine (2S,6S-HNK) and 2R,6R-hydroxynorketamine (2R,6R-HNK) in serum and urine with the ability to separate and detect 10 additional hydroxylated norketamine metabolites of racemic ketamine...
February 27, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28273522/determination-of-catecholamines-and-endogenous-related-compounds-in-rat-brain-tissue-exploring-their-native-fluorescence-and-liquid-chromatography
#4
Beatriz M Fonseca, Márcio Rodrigues, Ana C Cristóvão, Daniela Gonçalves, Ana Fortuna, Liliana Bernardino, Amílcar Falcão, Gilberto Alves
The profiling analysis of catecholamines and their metabolites in brain tissue offers a crucial key to understand their functions in the body and the opportunity to follow up neural diseases. A rapid and simple liquid chromatography-fluorescence detection (LC-FLD) method was developed and validated for simultaneously measuring several catecholamines and endogenous related compounds in the rat brain tissue samples. The target analytes measured in this bioanalytical assay were levodopa (L-DOPA), dopamine (DA), norepinephrine (NE), epinephrine (E), 3-O-methyldopa (3-O-MD), and homovanillic acid (HVA), being the 3,4-dihydroxybenzylamine (DHBA) used as internal standard (IS)...
April 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28247586/low-bone-mineral-density-risk-factors-and-testing-patterns-in-institutionalized-adults-with-intellectual-and-developmental-disabilities
#5
Mailee Hess, Elizabeth J Campagna, Kristin M Jensen
BACKGROUND: Adults with intellectual or developmental disability (ID/DD) have multiple risks for low bone mineral density (BMD) without formal guidelines to guide testing. We sought to identify risk factors and patterns of BMD testing among institutionalized adults with ID/DD. METHODS: We evaluated risk factors for low BMD (Z-/T-score < -1) and patterns of BMD testing among adults with ID/DD receiving care at a state-run residential facility. Kruskal-Wallis, Fisher's exact and Pearson's chi-squared tests were used as appropriate...
March 1, 2017: Journal of Applied Research in Intellectual Disabilities: JARID
https://www.readbyqxmd.com/read/28242574/an-improved-size-exclusion-hplc-method-for-molecular-size-distribution-analysis-of-immunoglobulin-g-using-sodium-perchlorate-in-the-eluent
#6
Hsiaoling Wang, Mark S Levi, Alfred V Del Grosso, William M McCormick, Lokesh Bhattacharyya
Size exclusion (SE) high performance liquid chromatography (HPLC) is widely used for the molecular size distribution (MSD) analyses of various therapeutic proteins. We report development and validation of a SE-HPLC method for MSD analyses of immunoglobulin G (IgG) in products using a TSKgel SuperSW3000 column and eluting it with 0.4M NaClO4, a chaotropic salt, in 40mM phosphate buffer, pH 6.8. The chromatograms show distinct peaks of aggregates, tetramer, and two dimers, as well as the monomer and fragment peaks...
February 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28237685/evaluation-of-a-new-handheld-point-of-care-blood-gas-analyser-using-100-equine-blood-samples
#7
David Bardell, Eleanor West, J Mark Senior
OBJECTIVES: To determine whether the Enterprise point-of-care blood analysis system (EPOC) produces results in agreement with two other blood gas analysers in regular clinical use (i-STAT and Radiometer ABL77) and to investigate the precision of the new machine when used with equine whole blood. STUDY DESIGN: Prospective, randomized, non-blinded, comparative laboratory analyser study. ANIMALS: Horses admitted to a university teaching hospital requiring arterial or venous blood gas analysis as part of their routine clinical management...
February 22, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/28236327/analytical-evaluation-of-the-adams-%C3%A2-a1c-ha8180t-analyzer-for-the-measurement-of-hba1c
#8
Eloísa Urrechaga
BACKGROUND: The ADAMS(™) A1c HA-8180T (ARKRAY, Inc., Kyoto, Japan) is a high pressure liquid chromatography system designed for separation and quantitation of HbA1c, while detecting hemoglobin (Hb) variants and HbA2 , with an analysis time of just 3.5 min. The aim was to evaluate the analytical performance of this analyzer for routine HbA1c quantitation. METHODS: Trueness, imprecision, carry over, linearity, the effect of anemia and correlation with ADAMS(™) A1c HA-8180V (in Variant mode) were assessed according to guidelines of the Clinical and Laboratory Standards Institute (CLSI) and manufacturer...
February 25, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28193352/a-straightforward-validated-liquid-chromatography-coupled-to-tandem-mass-spectrometry-method-for-the-simultaneous-detection-of-nine-drugs-of-abuse-and-their-metabolites-in-hair-and-nails
#9
Delphine Cappelle, Mireille De Doncker, Celine Gys, Kamelia Krysiak, Steven De Keukeleire, Walid Maho, Cleo L Crunelle, Geert Dom, Adrian Covaci, Alexander L N van Nuijs, Hugo Neels
Hair and nails allow for a stable accumulation of compounds over time and retrospective investigation of past exposure and/or consumption. Owing to their long window of detection (weeks to months), analysis of these matrices can provide information complementary to blood and urine analysis or can be used in standalone when e.g. elimination from the body has already occurred. Drugs of abuse are often used together and, therefore, multi-analyte methods capable of detecting several substances and their metabolites in a single run are of importance...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28192758/ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-for-simple-and-simultaneous-quantification-of-cannabinoids
#10
Rohitash Jamwal, Ariel R Topletz, Bharat Ramratnam, Fatemeh Akhlaghi
Cannabis is used widely in the United States, both recreationally and for medical purposes. Current methods for analysis of cannabinoids in human biological specimens rely on complex extraction process and lengthy analysis time. We established a rapid and simple assay for quantification of Δ(9)-tetrahydrocannabinol (THC), cannabidiol (CBD), 11-hydroxy Δ(9)-tetrahydrocannabinol (11-OH THC) and 11-nor-9-carboxy-Δ(9)-tetrahydrocannbinol (THCCOOH) in human plasma by U-HPLC-MS/MS usingΔ9-tetrahydrocannabinol-D3 (THC-D3) as the internal standard...
March 24, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28174126/accuracy-of-asge-high-risk-criteria-in-evaluation-of-patients-with-suspected-common-bile-duct-stones
#11
Huiqin He, Chenfei Tan, Jiaguo Wu, Ning Dai, Weiling Hu, Yawen Zhang, Loren Laine, James Scheiman, John J Kim
BACKGROUND AND AIMS: Endoscopic retrograde cholangiopancreatography (ERCP) is recommended for patients considered high-risk for choledocholithiasis after biochemical testing and abdominal ultrasound. Our aim was to determine whether American Society for Gastrointestinal Endoscopy (ASGE) guidelines accurately select patients where the risk of ERCP is justified. METHODS: Consecutive patients hospitalized with suspected choledocholithiasis at Sir Run Run Shaw Hospital who received biochemical testing, abdominal ultrasound, and definitive testing for choledocholithiasis (magnetic resonance cholangiopancreatography (MRCP), endoscopic ultrasound (EUS), ERCP, intraoperative cholangiogram (IOC), common bile duct (CBD) exploration) were identified...
February 4, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28153282/utilizing-online-dual-spe-lc-with-hrms-for-the-simultaneous-quantification-of-amphotericin-b-fluconazole-and-fluorocytosine-in-human-plasma-and-cerebrospinal-fluid
#12
Lihua Qu, Jing Qian, Ping Ma, Zheng Yin
Amphotericin B (AMB), fluconazole (FZ), and fluorocytosine (FC) are recommended for HIV-associated cryptococcal meningitis (CM) patients as preferred antibiotics. This study presents a fast and automated online-dual-solid phase extraction (SPE)-LC coupled with high resolution mass spectrometer (HRMS) method to simultaneously measure the concentrations of AMB, FZ, and FC in human plasma and cerebrospinal fluid (CSF). Automated sample clean-up was performed on the human plasma and CSF samples with stop-flow heart-cutting two dimensional (2D) separation using a online-dual-SPE system, allowing retention and accumulation of AMB, FZ, and carbamazepine (CBZ, Internal standard (IS)) by the Oasis(®)HLB cartridge, and retention and accumulation of FC and 5-methylcytosine hydrochloride (MC, IS) by the HyperSep Hypercarb cartridge respectively...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28152859/faster-ways-of-pursuing-quality-control-using-ehr-electronic-health-record
#13
Samip R Master, Glenn Morris Mills, Richard P Mansour
169 Background: In this era of electronic health records (EHR), quality monitoring can be a fast repetitive process. Having access to the relational database of the EHR permits rapid case identification and quality indicator determination. We hereby describe evaluation of hepatitis B testing prior to rituximab administration, a quality measure as per ASCO guidelines. METHODS: We connected SQL Query Manager with EPIC Clarity database. Using the object model for medication orders, location and department, we used SQL language to build a temporary dataset of all patients who have a completed order for a Rituximab infusion at a specific department location within the past 6 months...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28150477/red-ginseng-as-an-ergogenic-aid-a-systematic-review-of-clinical-trials
#14
REVIEW
Nan Hee Lee, Hyun Chul Jung, Sukho Lee
Purpose: This systematic review was performed to summarize clinical trials assessing the effect of Red Ginseng (RG) supplementation on exercise performance and fatigue recovery. Methods: Two English databases (PUBMED, MEDLINE) and two Korean databases (KISS, RISS) were used as systematic searching engines. We included only articles written in the English and Korean languages. Clinical trials, which evaluated exercise performance and recovery variables with RG supplementation, were included in this review...
December 31, 2016: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28137276/towards-standardization-of-next-generation-sequencing-of-ffpe-samples-for-clinical-oncology-intrinsic-obstacles-and-possible-solutions
#15
Maxim Ivanov, Konstantin Laktionov, Valery Breder, Polina Chernenko, Ekaterina Novikova, Ekaterina Telysheva, Sergey Musienko, Ancha Baranova, Vladislav Mileyko
BACKGROUND: Next generation sequencing has a potential to revolutionize the management of cancer patients within the framework of precision oncology. Nevertheless, lack of standardization decelerated entering of the technology into the clinical testing space. Here we dissected a number of common problems of NGS diagnostics in oncology and introduced ways they can be resolved. METHODS: DNA was extracted from 26 formalin fixed paraffin embedded (FFPE) specimens and processed with the TrueSeq Amplicon Cancer Panel (Illumina Inc, San Diego, California) targeting 48 cancer-related genes and sequenced in single run...
January 31, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28130542/optimization-and-validation-of-high-resolution-mass-spectrometry-data-analysis-parameters
#16
Jennifer M Colby, Katie L Thoren, Kara L Lynch
High-resolution mass spectrometry (HRMS) has gained recognition as a valuable tool for comprehensive drug screening in a variety of biological matrices. HRMS instruments collect untargeted, accurate mass data, which permit identification of known and unknown compounds in a single analytical run. One of the most challenging aspects of implementing an HRMS drug screen is establishing appropriate data analysis parameters for identifying compounds. Unlike other types of mass spectrometry data, guidelines for HRMS data analysis and acceptability criteria have not been established...
January 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28098395/first-uhplc-ms-ms-method-coupled-with-automated-online-spe-for-quantification-both-of-tacrolimus-and-everolimus-in-peripheral-blood-mononuclear-cells-and-its-application-on-samples-from-co-treated-pediatric-patients
#17
Debora Pensi, Amedeo De Nicolò, Michele Pinon, Clarissa Pisciotta, Pier Luigi Calvo, Antonello Nonnato, Renato Romagnoli, Francesco Tandoi, Giovanni Di Perri, Antonio D'Avolio
Tacrolimus (TAC, FK-506) and everolimus (EVE, RAD001) are immunosuppressors used to treat pediatric patients undergoing liver transplantation. Their hematic TDM by liquid chromatography became standard practice. However, it does not always reflect concentrations at their active site. Our aim was to develop and validate a new method for the simultaneous TAC and EVE quantification into target cells: peripheral blood mononuclear cells (PBMCs). Peripheral blood mononuclear cells were collected using cell preparation tubes; cells number and mean cell volume were evaluated by an automatic cell counter...
March 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28098262/quantification-of-the-sources-and-composition-of-particulate-matter-by-field-deployable-mass-spectrometry-implications-for-air-quality-and-public-health
#18
Patrick L Hayes
Airborne particulate matter less than 2.5 μm in diameter (PM2.5) negatively impacts air quality in cities throughout the world where it has been linked to increased cardiac and respiratory morbidity and mortality. For this reason PM2.5 standards have been established by many countries and the World Health Organization. However, these guidelines are regularly exceeded in North America, Europe and East Asia. While PM2.5 is often reported as a single atmospheric species, it is actually a mixture of organic and inorganic compounds...
January 18, 2017: Analyst
https://www.readbyqxmd.com/read/28090477/the-economic-cost-of-implementing-maternal-and-neonatal-death-review-in-a-district-of-bangladesh
#19
Animesh Biswas, Abdul Halim, Fazlur Rahman, Charli Eriksson, Koustuv Dalal
INTRODUCTION: Maternal and neonatal death review (MNDR) introduced in Bangladesh and initially piloted in a district during 2010. MNDR is able to capture each of the maternal, neonatal deaths and stillbirths from the community and government facilities (hospitals). This study aimed to estimate the cost required to implement MNDR in a district of Bangladesh during 2010-2012. MATERIALS AND METHODS: MNDR was implemented in Thakurgaon district in 2010 and later gradually extended until 2015...
December 9, 2016: Journal of Public Health Research
https://www.readbyqxmd.com/read/28077751/performance-of-health-workers-using-an-electronic-algorithm-for-the-management-of-childhood-illness-in-tanzania-a-pilot-implementation-study
#20
Clotilde Rambaud-Althaus, Amani Shao, Josephine Samaka, Ndeniria Swai, Seneca Perri, Judith Kahama-Maro, Marc Mitchell, Valérie D'Acremont, Blaise Genton
In low-resource settings, where qualified health workers (HWs) are scarce and childhood mortality high, rational antimicrobial prescription for childhood illnesses is a challenge. To assess whether smartphones running guidelines, as compared with paper support, improve consultation process and rational use of medicines for children, a pilot cluster-randomized controlled study was conducted in Tanzania. Nine primary health-care facilities (HFs) were randomized into three arms: 1) paper algorithm, 2) electronic algorithm on a smartphone, and 3) control...
January 11, 2017: American Journal of Tropical Medicine and Hygiene
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