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phase response curve

Chuan Zhou, Heang-Ping Chan, Lubomir M Hadjiiski, Aamer Chughtai, Jun Wei, Ella A Kazerooni
PURPOSE: The authors are developing an automated method to identify the best-quality coronary arterial segment from multiple-phase coronary CT angiography (cCTA) acquisitions, which may be used by either interpreting physicians or computer-aided detection systems to optimally and efficiently utilize the diagnostic information available in multiple-phase cCTA for the detection of coronary artery disease. METHODS: After initialization with a manually identified seed point, each coronary artery tree is automatically extracted from multiple cCTA phases using our multiscale coronary artery response enhancement and 3D rolling balloon region growing vessel segmentation and tracking method...
October 2016: Medical Physics
Gregory F Guzauskas, Kathleen F Villa, Geertrui F Vanhove, Vicki L Fisher, David L Veenstra
PURPOSE: To estimate the risk-benefit trade-off of a pediatric-inspired regimen versus hyperfractionated cyclophosphamide, vincristine, doxorubicin, and dexamethasone (hyper-CVAD) for first-line treatment of adolescents/young adult (AYA; ages 16-39 years) patients with Philadelphia-negative acute lymphoblastic leukemia. METHODS: Patient outcomes were simulated using a 6-state Markov model, including complete response (CR), no CR, first relapse, second CR, second relapse, and death...
October 25, 2016: Journal of Adolescent and Young Adult Oncology
Anna Slovick, Abdel Douiri, Rachel Muir, Andrea Guerra, Konstantinos Tsioulos, Evie Hay, Emily P S Lam, Joanna Kelly, Janet L Peacock, Sun Ying, Mohamed H Shamji, David J Cousins, Stephen R Durham, Stephen J Till
BACKGROUND: Repeated low dose grass pollen intradermal allergen injection suppresses allergen-induced cutaneous late phase responses, comparable with conventional subcutaneous and sublingual immunotherapy. OBJECTIVE: To evaluate the efficacy and safety of grass pollen intradermal immunotherapy in the treatment of allergic rhinitis. METHODS: We randomly assigned 93 adults with grass pollen allergic rhinitis to receive 7 pre-seasonal intradermal allergen injections (containing 7 nanograms of Phl p 5 major allergen) or histamine control...
October 20, 2016: Journal of Allergy and Clinical Immunology
Ana M Denis-Bacelar, Sarah J Chittenden, David P Dearnaley, Antigoni Divoli, Joe M O'Sullivan, V Ralph McCready, Bernadette Johnson, Yong Du, Glenn D Flux
PURPOSE: To investigate the role of patient-specific dosimetry as a predictive marker of survival and as a potential tool for individualised molecular radiotherapy treatment planning of bone metastases from castration-resistant prostate cancer, and to assess whether higher administered levels of activity are associated with a survival benefit. METHODS: Clinical data from 57 patients who received 2.5-5.1 GBq of (186)Re-HEDP as part of NIH-funded phase I/II clinical trials were analysed...
October 21, 2016: European Journal of Nuclear Medicine and Molecular Imaging
D Stott, M Bolten, D Paraschiv, I Papastefanou, J B Chambers, N A Kametas
OBJECTIVE: Pregnant hypertensive women who do not respond to labetalol but need vasodilatory therapy for blood pressure (BP) control rapidly progress to severe disease, which may be delayed by early recognition and individualised BP treatment. In this study, we sought to create prediction models at presentation, at 1 and 24 hours after commencement of treatment to identify patients who will not show a sustained response to labetalol and therefore need vasodilatory therapy. METHODS: The study population comprised of 134 women presenting with hypertension at a UK hospital...
October 20, 2016: Ultrasound in Obstetrics & Gynecology
Casey O Diekman, Amitabha Bose
Circadian oscillators found across a variety of species are subject to periodic external light-dark forcing. Entrainment to light-dark cycles enables the circadian system to align biological functions with appropriate times of day or night. Phase response curves (PRCs) have been used for decades to gain valuable insights into entrainment; however, PRCs may not accurately describe entrainment to photoperiods with substantial amounts of both light and dark due to their reliance on a single limit cycle attractor...
October 17, 2016: Journal of Biological Rhythms
Dong-Seok Yim
In the early phase of clinical development of antihypertensive drugs, quantitative modeling to predict their dose-concentration-response relationship is important to plan future clinical development and finding optimal dosage regimen at marketing approval. Two cases of concentration-response models of antihypertensive are presented here.Case 1: Carvedilol is a α1- and nonselective β- adrenergic receptor antagonist currently used for the management of mild-to-moderate essential hypertension and congestive heart failure...
September 2016: Journal of Hypertension
Valentina Franco, Roberto Marchiselli, Cinzia Fattore, Elena Tartara, Giovambattista De Sarro, Emilio Russo, Emilio Perucca
BACKGROUND: Perampanel, a new specific non-competitive AMPA receptor antagonist, has been recently approved in the United States and the European Union for the adjunctive treatment of focal seizures and primary generalized tonic-clonic seizures associated with idiopathic generalized epilepsy. A positive relationship between plasma perampanel concentration and improvement in seizure control has been identified in regulatory trials, suggesting that therapeutic drug monitoring (TDM) could be useful in optimizing clinical response in patients with epilepsy treated with perampanel...
October 6, 2016: Therapeutic Drug Monitoring
Anees A Ansari, Abdul K Parchur, Brijesh Kumar, S B Rai
The design of nanostructured materials with highly stable water-dispersion and luminescence efficiency is an important concern in nanotechnology and nanomedicine. In this paper, we described the synthesis and distinct surface modification on the morphological structure and optical (optical absorption, band gap energy, excitation, emission, decay time, etc.) properties of highly crystalline water-dispersible CaF2:Ce/Tb nanocrystals (core-nanocrystals). The epitaxial growth of inert CaF2 and silica shell, respectively, on their surface forming as CaF2:Ce/Tb@CaF2 (core/shell) and CaF2:Ce/Tb@CaF2@SiO2 (core/shell/SiO2) nanoarchitecture...
December 2016: Journal of Materials Science. Materials in Medicine
Rodrigo Cristofoletti, Jennifer B Dressman
In vitro-in vivo extrapolation techniques combined with physiologically based pharmacokinetic models represent a feasible approach to establishing links between critical quality attributes and the time course of drug concentrations in vivo. By further integrating the results with pharmacodynamic (PD) models, scientists can also explore the time course of drug effect. The aim of this study was to assess whether differences in dissolution rates would affect the onset, magnitude, and duration of the time course of ibuprofen-mediating pain relief...
October 14, 2016: Journal of Pharmaceutical Sciences
Corey J Langer, Shirish M Gadgeel, Hossein Borghaei, Vassiliki A Papadimitrakopoulou, Amita Patnaik, Steven F Powell, Ryan D Gentzler, Renato G Martins, James P Stevenson, Shadia I Jalal, Amit Panwalkar, James Chih-Hsin Yang, Matthew Gubens, Lecia V Sequist, Mark M Awad, Joseph Fiore, Yang Ge, Harry Raftopoulos, Leena Gandhi
BACKGROUND: Limited evidence exists to show that adding a third agent to platinum-doublet chemotherapy improves efficacy in the first-line advanced non-small-cell lung cancer (NSCLC) setting. The anti-PD-1 antibody pembrolizumab has shown efficacy as monotherapy in patients with advanced NSCLC and has a non-overlapping toxicity profile with chemotherapy. We assessed whether the addition of pembrolizumab to platinum-doublet chemotherapy improves efficacy in patients with advanced non-squamous NSCLC...
October 10, 2016: Lancet Oncology
Kristen A Marrone, Jarushka Naidoo, Julie R Brahmer
The treatment paradigm for lung cancer has been transformed in recent years by the use of immunotherapy, specifically, immune checkpoint antibodies (mAb), which are agents designed to reinvigorate an immune-mediated anticancer response by releasing the effects of tumor-mediated immunosuppression. Late-phase clinical trials of these agents in patients with advanced lung cancers have translated into improved clinical outcomes compared with standard-of-care chemotherapy for the treatment of metastatic non-small cell lung cancer, and have resulted in FDA approvals for two immune checkpoint mAbs in the second-line setting...
October 2016: Seminars in Respiratory and Critical Care Medicine
Susana Garcia-Gutierrez, José Maria Quintana, Ane Antón-Ladislao, Maria Soledad Gallardo, Esther Pulido, Irene Rilo, Elena Zubillaga, Miren Morillas, José Juan Onaindia, Nekane Murga, Ricardo Palenzuela, José González Ruiz
Our aims were to create and validate a clinical decision rule to assess severity in acute heart failure. We conducted a prospective cohort study of patients with symptoms of acute heart failure who attended the emergency departments (EDs) of three hospitals between April 2011 and April 2013. The following data were collected on arrival to or during the stay in the ED: baseline severity of symptoms; presence of decompensated comorbidities; number of hospital admissions/visits to EDs for acute heart failure during the previous 24 months; triggers of the exacerbation; clinical signs and symptoms; results of ancillary tests requested in the ED; treatments prescribed; and response to the initial treatment in the ED...
October 11, 2016: Internal and Emergency Medicine
John A Todd, Marina Evangelou, Antony J Cutler, Marcin L Pekalski, Neil M Walker, Helen E Stevens, Linsey Porter, Deborah J Smyth, Daniel B Rainbow, Ricardo C Ferreira, Laura Esposito, Kara M D Hunter, Kevin Loudon, Kathryn Irons, Jennie H Yang, Charles J M Bell, Helen Schuilenburg, James Heywood, Ben Challis, Sankalpa Neupane, Pamela Clarke, Gillian Coleman, Sarah Dawson, Donna Goymer, Katerina Anselmiova, Jane Kennet, Judy Brown, Sarah L Caddy, Jia Lu, Jane Greatorex, Ian Goodfellow, Chris Wallace, Tim I Tree, Mark Evans, Adrian P Mander, Simon Bond, Linda S Wicker, Frank Waldron-Lynch
BACKGROUND: Interleukin-2 (IL-2) has an essential role in the expansion and function of CD4+ regulatory T cells (Tregs). Tregs reduce tissue damage by limiting the immune response following infection and regulate autoreactive CD4+ effector T cells (Teffs) to prevent autoimmune diseases, such as type 1 diabetes (T1D). Genetic susceptibility to T1D causes alterations in the IL-2 pathway, a finding that supports Tregs as a cellular therapeutic target. Aldesleukin (Proleukin; recombinant human IL-2), which is administered at high doses to activate the immune system in cancer immunotherapy, is now being repositioned to treat inflammatory and autoimmune disorders at lower doses by targeting Tregs...
October 2016: PLoS Medicine
Bhushan P Kore, Shilpa A Pardhi, N S Dhoble, S J Dhoble, H C Swart
A series of single-phase phosphors based on Na6 Mg(SO4 )4 (Zeff  = 11.70) doped with Dy and Eu was prepared by the wet chemical method. The photoluminescence (PL) and thermoluminescence (TL) properties of Dy(3)(+) - and Eu(3)(+) -activated Na6 Mg(SO4 )4 phosphors were investigated. The characteristic emissions of Dy(3)(+) and Eu(3)(+) were observed in the Na6 Mg(SO4 )4 host. The TL glow curve of the Na6 Mg(SO4 )4 :Dy phosphor consisted of a prominent peak at 234°C and a very small hump at 158°C. The TL sensitivity of the Na6 Mg(SO4 )4 :Dy phosphor was found to be four times less than the commercialized CaSO4 :Dy phosphor...
October 10, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
Nazzareno Fagoni, Anna Taboni, Giovanni Vinetti, Sara Bottarelli, Christian Moia, Aurélién Bringard, Guido Ferretti
INTRODUCTION: We tested the hypothesis that the alveolar gas composition at the transition between the steady phase II (φ2) and the dynamic phase III (φ3) of the cardiovascular response to apnoea may lay on the physiological breaking point curve (Lin et al., 1974). METHODS: Twelve elite divers performed maximal and φ2-interrupted apnoeas, in air and pure oxygen. We recorded beat-by-beat arterial blood pressure and heart rate; we measured alveolar oxygen and carbon dioxide pressures (PAO2 and PACO2, respectively) before and after apnoeas; we calculated the PACO2 difference between the end and the beginning of apnoeas (ΔPACO2)...
October 6, 2016: Respiratory Physiology & Neurobiology
Anne H Krog, Mehdi Sahba, Erik M Pettersen, Irene Sandven, Per M Thorsby, Jørgen J Jørgensen, Jon O Sundhagen, Syed Ss Kazmi
PURPOSE: Minimally invasive surgical techniques have been shown to reduce the inflammatory response related to a surgical procedure. The main objective of our study was to measure the inflammatory response in patients undergoing a totally laparoscopic versus open aortobifemoral bypass surgery. This is the first randomized trial on subjects in this population. PATIENTS AND METHODS: This is a substudy of a larger randomized controlled multicenter trial (Norwegian Laparoscopic Aortic Surgery Trial)...
2016: Vascular Health and Risk Management
Katherine Vinson, Xiao-Xiang Yu, Nicholas De Leon, Christopher R Weinberger, Gregory B Thompson
HfN specimens deformed via four-point bend tests at room temperature and at 2300 °C (~0.7 Tm) showed increased plasticity response with temperature. Dynamic diffraction via transmission electron microscopy (TEM) revealed ⟨110⟩{111} as the primary slip system in both temperature regimes and ⟨110⟩{110} to be a secondary slip system activated at elevated temperature. Dislocation line lengths changed from a primarily linear to a curved morphology with increasing temperature suggestive of increased dislocation mobility being responsible for the brittle to ductile temperature transition...
October 6, 2016: Scientific Reports
Paul M D Foster
Regulatory studies of developmental and reproductive toxicity (DART) studies have remained largely unchanged for decades, with exposures occurring at various phases of the reproductive cycle and toxicity evaluations at different ages/times depending on the study purpose. The National Toxicology Program has conducted studies examining the power to detect adverse effects where there is a prenatal exposure, but evaluations occur postnatally. In these studies, examination is required of only 1 male and female pup from each litter beyond weaning...
October 5, 2016: Toxicologic Pathology
Sai-Hong Ignatius Ou, Ramaswamy Govindan, Keith D Eaton, Gregory A Otterson, Martin E Gutierrez, Alain C Mita, Athanassios Argiris, Nicoletta M Brega, Tiziana Usari, Weiwei Tan, Steffan N Ho, Francisco Robert
INTRODUCTION: This phase I trial was conducted to determine the safety, maximum tolerated dose (MTD)/recommended phase II dose, and efficacy of crizotinib plus erlotinib in patients with advanced non-squamous non-small cell lung cancer (NSCLC). METHODS: NSCLC patients with an Eastern Cooperative Oncology Group performance status of 0-2 after failure of 1-2 prior chemotherapy regimens were eligible. Erlotinib 100 mg was given continuously once daily (QD) starting between day -14 and -7; crizotinib 200 mg twice daily (BID; dose level 1) or 150 mg BID (dose level -1) was added continuously beginning on treatment cycle 1, day 1...
September 30, 2016: Journal of Thoracic Oncology
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