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https://www.readbyqxmd.com/read/28317143/role-of-pharmaceutical-care-for-self-administered-pulmonary-tuberculosis-treatment-in-thailand
#1
P Tanvejsilp, E Pullenayegum, M Loeb, J Dushoff, F Xie
WHAT IS KNOWN AND OBJECTIVE: With resource constraints in Thailand, directly observed therapy (DOT) for treating tuberculosis (TB) may not be feasible to implement. To improve patients' adherence, hospitals either modify DOT or adopt different approaches: pharmaceutical care or home visit. Our objective was to assess pulmonary TB treatment success rate of pharmaceutical care compared to home visit and modified DOT in Thailand. METHODS: We conducted a retrospective cohort study using data collected in adult pulmonary TB patients starting treatment between October 2010 and September 2013 in three hospitals in Thailand...
March 19, 2017: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/28300378/comparison-of-linear-and-nonlinear-programming-approaches-for-worst-case-dose-and-minmax-robust-optimization-of-intensity-modulated-proton-therapy-dose-distributions
#2
Maryam Zaghian, Wenhua Cao, Wei Liu, Laleh Kardar, Sharmalee Randeniya, Radhe Mohan, Gino Lim
Robust optimization of intensity-modulated proton therapy (IMPT) takes uncertainties into account during spot weight optimization and leads to dose distributions that are resilient to uncertainties. Previous studies demonstrated benefits of linear programming (LP) for IMPT in terms of delivery efficiency by considerably reducing the number of spots required for the same quality of plans. However, a reduction in the number of spots may lead to loss of robustness. The purpose of this study was to evaluate and compare the performance in terms of plan quality and robustness of two robust optimization approaches using LP and nonlinear programming (NLP) models...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28300375/photon-optimizer-po-prevails-over-progressive-resolution-optimizer-pro-for-vmat-planning-with-or-without-knowledge-based-solution
#3
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/28292435/obstacles-posed-by-the-tumor-microenvironment-to-t%C3%A2-cell-activity-a-case-for-synergistic-therapies
#4
REVIEW
Kristin G Anderson, Ingunn M Stromnes, Philip D Greenberg
T cell dysfunction in solid tumors results from multiple mechanisms. Altered signaling pathways in tumor cells help produce a suppressive tumor microenvironment enriched for inhibitory cells, posing a major obstacle for cancer immunity. Metabolic constraints to cell function and survival shape tumor progression and immune cell function. In the face of persistent antigen, chronic T cell receptor signaling drives T lymphocytes to a functionally exhausted state. Here we discuss how the tumor and its microenvironment influences T cell trafficking and function with a focus on melanoma, and pancreatic and ovarian cancer, and discuss how scientific advances may help overcome these hurdles...
March 13, 2017: Cancer Cell
https://www.readbyqxmd.com/read/28291927/single-fraction-radiosurgery-stereotactic-body-radiation-therapy-sbrt-for-spine-metastasis-a-dosimetric-comparison-of-multiple-delivery-platforms
#5
Adrian Nalichowski, Isaac Kaufman, John Gallo, Todd Bossenberger, Tim Solberg, Ezequiel Ramirez, Yulong Yan, Julie Fredrick, Tewfik Bichay, Alan Mayville, Jay Burmeister
There are numerous commercial radiotherapy systems capable of delivering single fraction spine radiosurgery/SBRT. We aim to compare the capabilities of several of these systems to deliver this treatment when following standardized criteria from a national protocol. Four distinct target lesions representing various case presentations of spine metastases were contoured in both the thoracic and lumbar spine of an anthropomorphic SBRT phantom. Single fraction radiosurgery/SBRT plans were designed for each target with each of our treatment platforms...
January 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28287517/microrna-based-regulation-of-picornavirus-tropism
#6
Autumn J Ruiz, Stephen J Russell
Cell-specific restriction of viral replication without concomitant attenuation can benefit vaccine development, gene therapy, oncolytic virotherapy, and understanding the biological properties of viruses. There are several mechanisms for regulating viral tropism, however they tend to be virus class specific and many result in virus attenuation. Additionally, many viruses, including picornaviruses, exhibit size constraints that do not allow for incorporation of large amounts of foreign genetic material required for some targeting methods...
February 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28282417/robust-plan-optimization-using-edge-enhanced-intensity-for-intrafraction-organ-deformation-in-prostate-intensity-modulated-radiation-therapy
#7
Iori Sumida, Hajime Yamaguchi, Indra J Das, Yusuke Anetai, Hisao Kizaki, Keiko Aboshi, Mari Tsujii, Yuji Yamada, Keisuke Tamari, Yuji Seo, Fumiaki Isohashi, Yasuo Yoshioka, Kazuhiko Ogawa
This study evaluated a method for prostate intensity-modulated radiation therapy (IMRT) based on edge-enhanced (EE) intensity in the presence of intrafraction organ deformation using the data of 37 patients treated with step-and-shoot IMRT. On the assumption that the patient setup error was already accounted for by image guidance, only organ deformation over the treatment course was considered. Once the clinical target volume (CTV), rectum, and bladder were delineated and assigned dose constraints for dose optimization, each voxel in the CTV derived from the DICOM RT-dose grid could have a stochastic dose from the different voxel location according to the probability density function as an organ deformation...
2017: PloS One
https://www.readbyqxmd.com/read/28277855/using-lower-cost-statins-improves-outcomes-for-normal-cholesterol-non-diabetic-patients
#8
Ronen Arbel, Dan Greenberg
BACKGROUND The American College of Cardiology recommends considering initiation of cholesterol-lowering therapy in normal cholesterol adults aged 45-70, who are either diabetic or have a 10 year atherosclerotic cardiovascular disease higher than 7.5%. Although this policy was shown to be cost-effective, the multi-billion dollar budget impact may limit the adoption, diffusion and overall clinical impact of this therapy. OBJECTIVES We examined whether using a substantially lower cost statin (Simvastatin) in a much wider population, while accepting almost-as-good per-patient outcomes can provide better outcomes for the entire intended use population (IUP) under a pre-specified budget constraint...
February 21, 2017: Expert Review of Pharmacoeconomics & Outcomes Research
https://www.readbyqxmd.com/read/28273644/practices-perceptions-and-expectations-for-carbohydrate-counting-in-patients-with-type-1-diabetes-results-from-an-online-survey
#9
Andréanne Fortin, Rémi Rabasa-Lhoret, Amélie Roy-Fleming, Katherine Desjardins, Anne-Sophie Brazeau, Martin Ladouceur, Véronique Gingras
AIMS: Characterize adult patients with diabetes on intensive insulin therapy in terms of: (a) practices and perceived difficulties relative to carbohydrate counting (CC) and diabetes treatment, and (b) their perceptions and expectations relative to CC. METHODS: Participants completed a 30-question web-based questionnaire. RESULTS: Participants with type 1 diabetes (T1D) and using CC as part of their treatment plan (n=180) were included in this analysis...
February 22, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28269428/the-impact-of-different-leaf-limited-accelerations-on-leaf-positional-error-of-a-self-developed-mlc-prototype
#10
Xiang Zhang, Peiqing Ye, Hui Zhang
Multi-leaf collimator (MLC) provides an available approach to achieve sophisticated radiotherapy techniques and plays an important role in advanced high quality radiation therapy. Delivery accuracy of radiation therapy mainly depends on the leaf sequence generated by treatment plans and dynamic performance of MLCs. Previous studies have explored the influence of various leaf limited velocities and dose rates on the leaf-positional error. However, there is a lack of research on the influence of different leaf limited accelerations on the delivery accuracy or leaf-positional error...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28261827/fast-shading-correction-for-cone-beam-ct-in-radiation-therapy-via-sparse-sampling-on-planning-ct
#11
Linxi Shi, Tiffany Tsui, Jikun Wei, Lei Zhu
PURPOSE: The image quality of cone beam computed tomography (CBCT) is limited by severe shading artifacts, hindering its quantitative applications in radiation therapy. In this work, we propose an image-domain shading correction method using planning CT (pCT) as prior information which is highly adaptive to clinical environment. METHOD: We propose to perform shading correction via sparse sampling on pCT. The method starts with a coarse mapping between the first-pass CBCT images obtained from the Varian TrueBeam system and the pCT...
March 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28258888/using-proton-beam-therapy-in-the-elderly-population-a-snapshot-of-current-perception-and-practice
#12
Juliette Thariat, Terence Sio, Pierre Blanchard, Samir Patel, Yusuke Demizu, Federico Ampil, Sebastien Guihard, Robert C Miller, Ulf Karlsson, Marco Krengli, Huan Giap, Nam Nguyen
PURPOSE: With limited proton therapy (PT) resources, several centers have designed their own decision-making systems for PT slot prioritization. The pediatric population is well recognized for deriving benefits from PT; however, elderly patients are not a focus for PT. When should PT be considered for use in the elderly population? METHODS AND MATERIALS: We performed a pilot survey of 25 international academic radiation oncologists (ROs) who also spend significant amounts of clinical time caring for elderly patients...
January 6, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28254302/effect-of-fibre-posts-bone-losses-and-fibre-content-on-the-biomechanical-behaviour-of-endodontically-treated-teeth-3d-finite-element-analysis
#13
Manila Chieruzzi, Stefano Pagano, Stefano Cianetti, Guido Lombardo, José M Kenny, Luigi Torre
The aim of this work was to evaluate the stress distribution inside endodontically treated teeth restored with different posts (glass fibre, carbon fibre and steel posts) under different loading conditions by using a 3D-finite element analysis. The effect of masticatory and impact forces on teeth with different degrees of bone loss was analysed. The model consists of: dentine, post, cement, gutta-percha, core and crown. Four simulations were conducted with two static forces (170N horizontal and 100N oblique) and two sections constrained: 1mm (alveolar bone position in a normal periodontium) and 6mm (middle of root) below the crown...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28253929/reducing-radiation-dose-to-normal-brain-through-a-risk-adapted-dose-reduction-protocol-for-patients-with-favourable-subtype-anaplastic-glioma
#14
M Back, M LeMottee, C Crasta, D Bailey, H Wheeler, L Guo, T Eade
AIM: In patients with isocitrate dehydrogenase (IDH) mutated anaplastic glioma determine the dosimetric benefits of delivering radiation therapy using a PET guided integrated boost IMRT technique (ib-IMRT) compared with standard IMRT (s-IMRT) in reducing dose to normal brain. METHODS: Ten patients with anaplastic glioma, identified as a favourable molecular subgroup through presence of IDH mutation, and managed with radiation therapy using an ib-IMRT were enrolled into a dosimetric study comparing two RT techniques: s-IMRT to 59...
March 2, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28250992/constraint-induced-movement-therapy-combined-with-transcranial-direct-current-stimulation-over-premotor-cortex-improves-motor-function-in-severe-stroke-a-pilot-randomized-controlled-trial
#15
Suellen M Andrade, Larissa M Batista, Lídia L R F Nogueira, Eliane A de Oliveira, Antonio G C de Carvalho, Soriano S Lima, Jordânia R M Santana, Emerson C C de Lima, Bernardino Fernández-Calvo
Objective. We compared the effects of transcranial direct current stimulation at different cortical sites (premotor and motor primary cortex) combined with constraint-induced movement therapy for treatment of stroke patients. Design. Sixty patients were randomly distributed into 3 groups: Group A, anodal stimulation on premotor cortex and constraint-induced movement therapy; Group B, anodal stimulation on primary motor cortex and constraint-induced movement therapy; Group C, sham stimulation and constraint-induced movement therapy...
2017: Rehabilitation Research and Practice
https://www.readbyqxmd.com/read/28247588/atrioventricular-dyssynchrony-from-empiric-device-settings-is-common-in-cardiac-resynchronization-therapy-and-adversely-impacts-left-ventricular-morphology-and-function
#16
Gregory J Sinner, Vedant A Gupta, Arash Seratnahaei, Richard J Charnigo, Yousef H Darrat, Samy C Elayi, Steve W Leung, Vincent L Sorrell
BACKGROUND: Echocardiographic atrioventricular (AV) optimization after cardiac resynchronization therapy (CRT) is uncommon due to time constraints and the use of vendor-specific device algorithms. It remains unclear whether optimization of mitral inflow velocities can still be useful. We aimed to investigate post implantation left ventricular (LV) inflow patterns to determine the incidence of AV dyssynchrony from empirically set devices. METHODS: This was a retrospective study of patients undergoing CRT using empiric device settings...
March 1, 2017: Echocardiography
https://www.readbyqxmd.com/read/28244412/delineation-of-internal-mammary-nodal-target-volumes-in-breast-cancer-radiation-therapy
#17
Krishan R Jethwa, Mohamed M Kahila, Katie N Hunt, Lindsay C Brown, Kimberly S Corbin, Sean S Park, Elizabeth S Yan, Judy C Boughey, Robert W Mutter
PURPOSE: The optimal clinical target volume for internal mammary (IM) node irradiation is uncertain in an era of increasingly conformal volume-based treatment planning for breast cancer. We mapped the location of gross internal mammary lymph node (IMN) metastases to identify areas at highest risk of harboring occult disease. METHODS AND MATERIALS: Patients with axial imaging of IMN disease were identified from a breast cancer registry. The IMN location was transferred onto the corresponding anatomic position on representative axial computed tomography images of a patient in the treatment position and compared with consensus group guidelines of IMN target delineation...
March 15, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28240447/comparison-of-treatment-techniques-for-reduction-in-the-submandibular-gland-dose-a-retrospective-study
#18
Christopher Hoyne, Marcus Dreosti, John Shakeshaft, Siddartha Baxi
INTRODUCTION: Recent studies have suggested reducing the dose submandibular glands receive when patients undergo head and neck radiotherapy can play a crucial role in preventing xerostomia. However, they are traditionally not spared due to concern that target coverage may be compromised. We investigated the possibility of sparing the contralateral submandibular gland (cSM) by utilising modern planning techniques. METHODS: 10 head and neck patients previously treated with conformal therapy at our centre were retrospectively planned using intensity modulated radiation therapy (IMRT), and volumetric modulated arc therapy (VMAT)...
February 27, 2017: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/28237294/automatic-planning-on-hippocampal-avoidance-whole-brain-radiotherapy
#19
Shuo Wang, Dandan Zheng, Chi Zhang, Rongtao Ma, Nathan R Bennion, Yu Lei, Xiaofeng Zhu, Charles A Enke, Sumin Zhou
Mounting evidence suggests that radiation-induced damage to the hippocampus plays a role in neurocognitive decline for patients receiving whole-brain radiotherapy (WBRT). Hippocampal avoidance whole-brain radiotherapy (HA-WBRT) has been proposed to reduce the putative neurocognitive deficits by limiting the dose to the hippocampus. However, urgency of palliation for patients as well as the complexities of the treatment planning may be barriers to protocol enrollment to accumulate further clinical evidence. This warrants expedited quality planning of HA-WBRT...
April 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28237293/method-of-predicting-the-mean-lung-dose-based-on-a-patient-s-anatomy-and-dose-volume-histograms
#20
Anna Zawadzka, Marta Nesteruk, Beata Brzozowska, Paweł F Kukołowicz
The aim of this study was to propose a method to predict the minimum achievable mean lung dose (MLD) and corresponding dosimetric parameters for organs-at-risk (OAR) based on individual patient anatomy. For each patient, the dose for 36 equidistant individual multileaf collimator shaped fields in the treatment planning system (TPS) was calculated. Based on these dose matrices, the MLD for each patient was predicted by the homemade DosePredictor software in which the solution of linear equations was implemented...
April 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
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