Search

Your search keyword '"Gleeson, J."' showing total 208 results
Start Over Author "Gleeson, J." Search Limiters Full Text
208 results on '"Gleeson, J."'

1. The interplay between spatial and heliconical orientational order in twist-bend nematic materials

Author

Saha, R, Feng, C, Welch, C, Mehl, GH, Feng, J, Zhu, C, Gleeson, J, Sprunt, S, and Jákli, A

Subjects
Macromolecular and Materials Chemistry, Chemical Sciences, Physical Sciences, Chemical Physics
Abstract

The helical pitch formed by organic molecules, such as the α-helix of proteins, usually requires hydrogen bonding between chiral units and long-range positional order. It was recently found that certain liquid crystal oligomers can have a twist-bend nematic (NTB) phase with nanoscale heliconical structure without hydrogen bonding, molecular chirality or positional order. To understand the nature of this unique structure, here we present hard and resonant tender X-ray scattering studies of two novel sulfur containing dimer materials. We simultaneously measure the temperature dependences of the helical pitch and the correlation length of both the helical and positional order. In addition to an unexpected strong variation of the pitch with the length of the spacer connecting the monomer units, we find that at the transition to the NTB phase the positional correlation length drops. The helical structure was found not only in the NTB phase but observed even in the upper range of a smectic phase that forms just below the NTB state. The coexistence of smectic layering and the heliconical order indicates a layered (SmATB) phase wherein the rigid units of the dimers are tilted with respect to the smectic layer normal in order to accommodate the bent conformation of the dimers and the tilt direction rotates along the heliconical axis.

Published
2021

2. Sparse power-law network model for reliable statistical predictions based on sampled data

Author

Kartun-Giles, A. P., Krioukov, D., Gleeson, J. P., Moreno, Y., and Bianconi, G.

Subjects
Physics - Physics and Society, Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Statistical Mechanics
Abstract

A projective network model is a model that enables predictions to be made based on a subsample of the network data, with the predictions remaining unchanged if a larger sample is taken into consideration. An exchangeable model is a model that does not depend on the order in which nodes are sampled. Despite a large variety of non-equilibrium (growing) and equilibrium (static) sparse complex network models that are widely used in network science, how to reconcile sparseness (constant average degree) with the desired statistical properties of projectivity and exchangeability is currently an outstanding scientific problem. Here we propose a network process with hidden variables which is projective and can generate sparse power-law networks. Despite the model not being exchangeable, it can be closely related to exchangeable uncorrelated networks as indicated by its information theory characterization and its network entropy. The use of the proposed network process as a null model is here tested on real data, indicating that the model offers a promising avenue for statistical network modelling., Comment: (26 pages 2 figures)

Published
2018
Full Text
View/download PDF

3. Light scattering study of the 'pseudo-layer' compression elastic constant in a twist-bend nematic liquid crystal

Author

Parsouzi, Z., Pardaev, Shokir A., Welch, C., Ahmed, Z., Mehl, G. H., Baldwin, A. R., Gleeson, J. T., Lavrentovich, O. D., Allender, D. W., Selinger, J. V., Jakli, A., and Sprunt, S.

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science, Physics - Optics
Abstract

The nematic twist-bend (TB) phase, exhibited by certain achiral thermotropic liquid crystalline (LC) dimers, features a nanometer-scale, heliconical rotation of the average molecular long axis (director) with equally probable left- and right-handed domains. On meso to macroscopic scales, the TB phase may be considered as a stack of equivalent slabs or "pseudo-layers", each one helical pitch in thickness. The long wavelength fluctuation modes should then be analogous to those of a smectic-A phase, and in particular the hydrodynamic mode combining "layer" compression and bending ought to be characterized by an effective layer compression elastic constant $B_{eff}$ and average director splay constant $K_1^{eff}$. The magnitude of $K_1^{eff}$ is expected to be similar to the splay constant of an ordinary nematic LC, but due to the absence of a true mass density wave, $B_{eff}$ could differ substantially from the typical value of $\sim 10^6$ Pa in a conventional smectic-A. Here we report the results of a dynamic light scattering study, which confirms the "pseudo-layer" structure of the TB phase with $B_{eff}$ in the range $\sim 10^3-10^4$ Pa. We show additionally that the temperature dependence of $B_{eff}$ at the TB to nematic transition is accurately described by a coarse-grained free energy density, which is based on a Landau-deGennes expansion in terms of a heli-polar order parameter that characterizes the TB state and is linearly coupled to bend distortion of the director., Comment: 9 pages, 7 figures

Published
2016
Full Text
View/download PDF

4. Second harmonic light scattering induced by defects in the twist-bend nematic phase of liquid crystal dimers

Author

Pardaev, Shokir A., Shamid, S. M., Tamba, M. G., Welch, C., Mehl, G. H., Gleeson, J. T., Allender, D. W., Selinger, J. V., Ellman, B., Jakli, A., and Sprunt, S.

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

The nematic twist-bend ($\mathrm{N_{TB}}$) phase, exhibited by certain thermotropic liquid crystalline (LC) dimers, represents a new orientationally ordered mesophase -- the first distinct nematic variant discovered in many years. The $\mathrm{N_{TB}}$ phase is distinguished by a heliconical winding of the average molecular long axis (director) with a remarkably short (nanoscale) pitch and, in systems of achiral dimers, with an equal probability to form right- and left-handed domains. The $\mathrm{N_{TB}}$ structure thus provides another fascinating example of spontaneous chiral symmetry breaking in nature. The order parameter driving the formation of the heliconical state has been theoretically conjectured to be a polarization field, deriving from the bent conformation of the dimers, that rotates helically with the same nanoscale pitch as the director field. It therefore presents a significant challenge for experimental detection. Here we report a second harmonic light scattering (SHLS) study on two achiral, $\mathrm{N_{TB}}$-forming LCs, which is sensitive to the polarization field due to micron-scale distortion of the helical structure associated with naturally-occurring textural defects. These defects are parabolic focal conics of smectic-like "pseudo-layers", defined by planes of equivalent phase in a coarse-grained description of the $\mathrm{N_{TB}}$ state. Our SHLS data are explained by a coarse-grained free energy density that combines a Landau-deGennes expansion of the polarization field, the elastic energy of a nematic, and a linear coupling between the two.

Published
2016
Full Text
View/download PDF

5. Anomalous increase in nematic-isotropic transition temperature in dimer molecules induced by magnetic field

Author

Salili, S. M., Tamba, M. G., Sprunt, S. N., Welch, C., Mehl, G. H., Jákli, A., and Gleeson, J. T.

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

We have determined the nematic-isotropic transition temperature as a function of applied magnetic field in three different thermotropic liquid crystalline dimers. These molecules are comprised of two rigid calamitic moieties joined end to end by flexible spacers with odd numbers of methylene groups. They show an unprecedented magnetic field enhancement of nematic order in that the transition temperature is increased by up to 15K when subjected to 22T magnetic field. The increase is conjectured to be caused by a magnetic field-induced decrease of the average bend angle in the aliphatic spacers connecting the rigid mesogenic units of the dimers.

Published
2016
Full Text
View/download PDF

6. Fluctuation modes of a twist-bend nematic liquid crystal

Author

Sh, Z. Parsouzi. A., Shamid, S. M., Borshch, V., Challa, P. K., Tamba, M. G., Welch, C., Mehl, G. H., Gleeson, J. T., Jakli, A., Lavrentovich, O. D., Allender, D. W., Selinger, J. V., and Sprunt, S.

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

We report a dynamic light scattering study of the fluctuation modes in a thermotropic liquid crystalline mixture of monomer and dimer compounds that exhibits the twist-bend nematic ($\mathrm{N_{TB}}$) phase. The results reveal a spectrum of overdamped fluctuations that includes two nonhydrodynamic and one hydrodynamic mode in the $\mathrm{N_{TB}}$ phase, and a single nonhydrodynamic plus two hydrodynamic modes (the usual nematic optic axis or director fluctuations) in the higher temperature, uniaxial nematic phase. The properties of these fluctuations and the conditions for their observation are comprehensively explained by a Landau-deGennes expansion of the free energy density in terms of heliconical director and helical polarization fields that characterize the $\mathrm{N_{TB}}$ structure, with the latter serving as the primary order parameter. A "coarse-graining" approximation simplifies the theoretical analysis, and enables us to demonstrate quantitative agreement between the calculated and experimentally determined temperature dependence of the mode relaxation rates., Comment: 14 pages and 8 figures

Published
2015
Full Text
View/download PDF

7. Bond percolation on multiplex networks

Author

Hackett, A., Cellai, D., Gómez, S., Arenas, A., and Gleeson, J. P.

Subjects
Physics - Physics and Society, Computer Science - Social and Information Networks
Abstract

We present an analytical approach for bond percolation on multiplex networks and use it to determine the expected size of the giant connected component and the value of the critical bond occupation probability in these networks. We advocate the relevance of these tools to the modeling of multilayer robustness and contribute to the debate on whether any benefit is to be yielded from studying a full multiplex structure as opposed to its monoplex projection, especially in the seemingly irrelevant case of a bond occupation probability that does not depend on the layer. Although we find that in many cases the predictions of our theory for multiplex networks coincide with previously derived results for monoplex networks, we also uncover the remarkable result that for a certain class of multiplex networks, well described by our theory, new critical phenomena occur as multiple percolation phase transitions are present. We provide an instance of this phenomenon in a multipex network constructed from London rail and European air transportation datasets., Comment: 8 pages, 4 figures

Published
2015
Full Text
View/download PDF

10. Twist-bend nematic liquid crystals in high magnetic fields

Author

Challa, P. K., Borshch, V., Parri, O., Imrie, C. T., Sprunt, S. N., Gleeson, J. T., Lavrentovich, O. D., and Jakli, A.

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

We present magneto-optic measurements on two materials that form the recently discovered twist-bend nematic (Ntb) phase. This intriguing state of matter represents a new fluid phase that is orientationally anisotropic in three directions and also exhibits translational order with periodicity several times larger than the molecular size. NTB materials may also spontaneously form a visible, macroscopic stripe texture. We show that the optical stripe texture can be persistently inhibited by a magnetic field, and a 25T external magnetic field depresses the N-Ntb phase transition temperature by almost 1 degree C. We propose a quantitative mechanism to account for this shift and suggest a Helfrich-Hurault-type mechanism for the optical stripe formation., Comment: 12 pages, 4 figures

Published
2014
Full Text
View/download PDF

11. Using policy analysis to explore the reciprocal impact of health policy on public health nursing and public health nursing on policy

Author

Gleeson, J. A.

Subjects
610.73, Nursing and Midwifery
Abstract

The overall aim of this study was to explore the reciprocal impact of health policy on public health nursing and public health nursing on policy. This study uses a new approach to considering public health nurses’ engagement in policy: one which puts public health nurses, as actors in the policy process, at the centre of the investigation. The overall philosophical lens through which the research was conducted was critical social theory and the methodology was a grounded theory influenced research design. The study adopted a three stage data collection and analysis process: primary data (questionnaires and interviews), detailed policy analyses of two specific White Papers and secondary data (extant documents). The data were collected and analysed through a grounded theory approach in order to answer four research questions: 1. What do public health nurses know about policy, specifically in relation to two English Department of Health White Papers: Creating A Patient-Led NHS (DOH 2005) and Our Health, Our Care, Our Say (DOH 2006)? 2. How do they engage in the policy process? 3. What affects their implementation of policy? 4. Is there a policy-practice gap? A triangulated approach to data collection and analysis was used. Primary data were collected through questionnaires and follow up telephone interviews with public health nurses (health visitors and school nurses) in four PCTs and one social enterprise in five different geographical areas of England. Further data from detailed policy analyses using frameworks by Popple and Leighninger (2008) and Walt and Gilson (1994) were also considered. Finally, secondary data from extant documents including newspapers, websites and organisational documents were reviewed. At the end of the research process, it was possible to answer the four research questions. In addition to this, new knowledge and theory emerged around three main themes: i) A proposal for a new combined framework for policy analysis which leads to a comprehensive and analytical account of policy content and context combined with a detailed consideration of the role of public health nurses as actors in the policy process. ii) Theories as to why and how public health nurses lack influence in the policy process. iii) Analysis of the effect of lack of resources on inhibiting practice innovation in response to policy agendas. Consideration of these theories led to several recommendations for practice. Throughout the research process, there was continued interaction between the three phases of data collection, analysis and theory development.

Published
2013

12. Electric Nusselt number characterization of electroconvection in nematic liquid crystals

Author

Gleeson, J. T., Gheorghiu, N., and Plaut, E.

Subjects
Nonlinear Sciences - Pattern Formation and Solitons
Abstract

We develop a characterization method of electroconvection structures in a planar nematic liquid crystal layer by a study of the electric current transport. Because the applied potential difference has a sinusoidal time dependence, we define two electric Nusselt numbers corresponding to the in-phase and out-of-phase components of the current. These Nusselt numbers are predicted theoretically using a weakly nonlinear analysis of the standard model. Our measurements of the electric current confirm that both numbers vary linearly with the distance from onset until the occurence of secondary instabilities; these instabilities also have a distinct Nusselt number signature. A systematic comparison between our theoretical and experimental results, using no adjusted parameters, demonstrates reasonable agreement. This represents a quantitative test of the standard model completely independent from traditional, optical techniques of studying electroconvection., Comment: 13 pages, 3 figures; submitted to Europhysics Letters, July, 1999

Published
1999

14. Doublecortin maintains bipolar shape and nuclear translocation during migration in the adult forebrain

Author

Koizumi, H, Higginbotham, H, Poon, T, Tanaka, T, Brinkman, B C, and Gleeson, J G

Abstract

The ability of the mature mammalian nervous system to continually produce neuronal precursors is of considerable importance, as manipulation of this process might one day permit the replacement of cells lost as a result of injury or disease. In mammals, the anterior subventricular zone (SVZa) region is one of the primary sites of adult neurogenesis. Here we show that doublecortin (DCX), a widely used marker for newly generated neurons, when deleted in mice results in a severe morphological defect in the rostral migratory stream and delayed neuronal migration that is independent of direction or responsiveness to Slit chemorepulsion. DCX is required for nuclear translocation and maintenance of bipolar morphology during migration of these cells. Our data identifies a critical function for DCX in the movement of newly generated neurons in the adult brain.

Published
2006

15. AHI1 gene mutations cause specific forms of Joubert syndrome-related disorders

Author

Valente, E M, Brancat, F, Silhavy, J L, Castori, M, March, S E, Barrano, G, Bertini, E, Boltshauser, E, Zaki, M S, Abdel-Aleem, A, Abdel-Salam, GMH, Bellacchlo, E, Battini, R, Cruse, R P, Dobyns, W B, Krishnamoorthy, K S, Lagier-Tourenne, C, Magee, A, Pascual-Castroviejo, I, Salpietro, C D, Sarco, D, Dallapiccola, B, and Gleeson, J G

Abstract

Joubert syndrome (JS) is a recessively inherited developmental brain disorder with several identified causative chromosomal loci. It is characterized by hypoplasia of the cerebellar vermis and a particular midbrain-hindbrain "molar tooth" sign, a finding shared by a group of Joubert syndrome-related disorders (JSRDs), with wide phenotypic variability. The frequency of mutations in the first positionally cloned gene, AHI1, is unknown. Methods: We searched for mutations in the AHI1 gene among a cohort of 137 families with JSRD and radiographically proven molar tooth sign. Results: We identified 15 deleterious mutations in 10 families with pure JS or JS plus retinal and/or additional central nervous system abnormalities. Mutations among families with JSRD including kidney or liver involvement were not detected. Transheterozygous mutations were identified in the majority of those without history of consanguinity. Most mutations were truncating or splicing errors, with only one missense mutation in the highly conserved WD40 repeat domain that led to disease of similar severity. Interpretation AHI1 mutations are a frequent cause of disease in patients with specific forms of JSRD.

Published
2006

16. Distinguishing the four genetic causes of Jouberts syndrome-related disorders

Author

Valente, E M, Marsh, S E, Castori, M, Dixon-Salazar, T, Bertini, E, Al-Gazali, L, Messer, J, Barbot, C, Woods, C G, Boltshauser, E, Al-Tawari, A A, Salpietro, C D, Kayserili, H, Sztriha, L, Gribaa, M, Koenig, M, Dallapiccola, B, and Gleeson, J G

Abstract

Jouberts syndrome-related disorders are a group of recessively inherited conditions showing cerebellar vermis hypoplasia and the molar tooth sign of the midbrain-hindbrain junction. Recent analyses have suggested at least three loci, JBTS1 (9q34-3), -2 (11p11.2-q12.3), and -3 (6q23), but the phenotypic spectrum associated with each locus has not been delineated. In addition, deletions of the NPHP1 gene, usually responsible for isolated juvenile nephronophthisis, are occasionally encountered among Jouberts syndrome-related disorder patients. Here, we describe four novel families showing evidence of linkage to two of these loci, provide a 3.6Mb refinement of the JBTS2 locus, and perform a detailed comparison of all linked families identified so far, to define the clinical and radiographical hallmarks for each genetic condition. We find that JBTS1 and -3 primarily show features restricted to the central nervous system, with JBTS1 showing largely pure cerebellar and midbrain-hindbrain junction involvement, and JBTS3 displaying cerebellar, midbrain-hindbrain junction, and cerebral cortical features, most notably polymicrogyria. Conversely, JBTS2 is associated with multiorgan involvement of kidney, retina, and liver, in addition to the central nervous system features, and results in extreme phenotypic variability. This provides a useful framework for genetic testing strategies and prediction of which patients are most likely to experience development of systemic complications.

Published
2005

17. Lis1 and doublecortin function with dynein to mediate coupling of the nucleus to the centrosome in neuronal migration

Author

Tanaka, T, Serneo, F F, Higgins, C, Gambello, M J, Wynshaw-Boris, A, and Gleeson, J G

Subjects
migration, Lis 1, doublecortin, centrosome, nucleus
Abstract

Humans with mutations in either DCX or LIS1 display nearly identical neuronal migration defects, known as lissencephaly. To define subcellular mechanisms, we have combined in vitro neuronal migration assays with retroviral transduction. Overexpression of wild-type Dcx or Lis1, but not patient-related mutant versions, increased migration rates. Dcx overexpression rescued the migration defect in Lis1(+/-) neurons. Lis1 localized predominantly to the centrosome, and after disruption of microtubules, redistributed to the perinuclear region. Dcx outlined microtubules extending from the perinuclear "cage" to the centrosome. Lis1(+/-) neurons displayed increased and more variable separation between the nucleus and the preceding centrosome during migration. Dynein inhibition resulted in similar defects in both nucleus-centrosome (N-C) coupling and neuronal migration. These N-C coupling defects were rescued by Dcx overexpression, and Dcx was found to complex with dynein. These data indicate Lis1 and Dcx function with dynein to mediate N-C coupling during migration, and suggest defects in this coupling may contribute to migration defects in lissencephaly.

Published
2004

19. Inhibition of G-protein signalling in cardiac dysfunction of intellectual developmental disorder with cardiac arrhythmia (IDDCA) syndrome

Author

De Nittis P., Efthymiou S., Sarre A., Guex N., Chrast J., Putoux A., Sultan T., Raza Alvi J., Ur Rahman Z., Zafar F., Rana N., Rahman F., Anwar N., Maqbool S., Zaki M. S., Gleeson J. G., Murphy D., Galehdari H., Shariati G., Mazaheri N., Sedaghat A., Lesca G., Chatron N., Salpietro V., Christoforou M., Houlden H., Simonds W. F., Pedrazzini T., Maroofian R., Reymond A., SYNAPS STUDY GROUP: SYNAPS Study Group: Stanislav Groppa, Blagovesta Marinova Karashova, Wolfgang Nachbauer, Sylvia Boesch, Larissa Arning, Dagmar Timmann, Bru Cormand, Belen Pérez-Dueñas, Jatinder S Goraya, Tipu Sultan, Jun Mine, Daniela Avdjieva, Hadil Kathom, Radka Tincheva, Selina Banu, Mercedes Pineda-Marfa, Pierangelo Veggiotti, Michel D. Ferrari, Arn M. J. M. van den Maagdenberg, Alberto Verrotti, Giangluigi Marseglia, Salvatore Savasta, Mayte García-Silva, Alfons Macaya Ruiz, Barbara Garavaglia, Eugenia Borgione, Simona Portaro, Benigno Monteagudo Sanchez, Richard Boles, Savvas Papacostas, Michail Vikelis, Eleni Zamba Papanicolaou, Efthymios Dardiotis, Shazia Maqbool, Shahnaz Ibrahim, Salman Kirmani, Nuzhat Noureen Rana, Osama Atawneh, George Koutsis, Salvatore Mangano, Carmela Scuderi, Giovanna Morello, Tanya Stojkovic, Massimo Zollo, Gali Heimer, Yves A. Dauvilliers, Pasquale Striano, Issam Al-Khawaja, Fuad Al-Mutairi, Hamed Sherifa., University of Lausanne (UNIL), University College of London [London] (UCL), Hôpital Femme Mère Enfant [CHU - HCL] (HFME), Hospices Civils de Lyon (HCL), Children's Hospital [Lahore], Institute of Child Health [Lahore], Children's Hospital [Multan], Institute of Child Health [Multan], National Research Centre - NRC (EGYPT), Howard Hughes Medical Institute (HHMI), Shahid Chamran University of Ahvaz (SCU), Ahvaz Jundishapur University of Medical Sciences (AJUMS), National Institutes of Health [Bethesda] (NIH), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Neuropsychiatrie : recherche épidémiologique et clinique (PSNREC), Université Montpellier 1 (UM1)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Université Montpellier 1 (UM1)-Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Lausanne = University of Lausanne (UNIL), Herrada, Anthony, P., De Nitti, S., Efthymiou, A., Sarre, N., Guex, J., Chrast, A., Putoux, T., Sultan, J., Raza Alvi, Z., Ur Rahman, F., Zafar, N., Rana, F., Rahman, N., Anwar, S., Maqbool, M. S., Zaki, J. G., Gleeson, D., Murphy, H., Galehdari, G., Shariati, N., Mazaheri, A., Sedaghat, G., Lesca, N., Chatron, V., Salpietro, M., Christoforou, H., Houlden, W. F., Simond, T., Pedrazzini, R., Maroofian, A., Reymond, STUDY GROUP: SYNAPS Study Group: Stanislav Groppa, Synap, Marinova Karashova, Blagovesta, Nachbauer, Wolfgang, Boesch, Sylvia, Arning, Larissa, Timmann, Dagmar, Cormand, Bru, Pérez-Dueñas, Belen, S Goraya, Jatinder, Sultan, Tipu, Mine, Jun, Avdjieva, Daniela, Kathom, Hadil, Tincheva, Radka, Banu, Selina, Pineda-Marfa, Mercede, Veggiotti, Pierangelo, Ferrari, Michel D., van den Maagdenberg, Arn M. J. M., Verrotti, Alberto, Marseglia, Giangluigi, Savasta, Salvatore, García-Silva, Mayte, Macaya Ruiz, Alfon, Garavaglia, Barbara, Borgione, Eugenia, Portaro, Simona, Monteagudo Sanchez, Benigno, Boles, Richard, Papacostas, Savva, Vikelis, Michail, Zamba Papanicolaou, Eleni, Dardiotis, Efthymio, Maqbool, Shazia, Ibrahim, Shahnaz, Kirmani, Salman, Noureen Rana, Nuzhat, Atawneh, Osama, Koutsis, George, Mangano, Salvatore, Scuderi, Carmela, Morello, Giovanna, Stojkovic, Tanya, Zollo, Massimo, Heimer, Gali, Dauvilliers, Yves A., Striano, Pasquale, Al-Khawaja, Issam, Al-Mutairi, Fuad, and Sherifa., Hamed

Subjects
Male, 0301 basic medicine, Developmental Disabilities, Batecs cardíacs, 0302 clinical medicine, Neurodevelopmental disorder, Heart Rate, Medicine, Child, Genetics (clinical), Mice, Knockout, Gnb5-null mouse models, GTP-Binding Protein beta Subunits, Cardiac muscle, Heart, Syndrome, IDDCA, Functional Genomics, Pedigree, [SDV.MHEP.CSC] Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system, cardiac conduction anomalies, Gnb5 -null mouse models, GNB5 variants, medicine.anatomical_structure, Child, Preschool, [SDV.BBM.GTP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], Female, medicine.symptom, Signal Transduction, Bradycardia, Cardiac function curve, Gnb5 -null mouse model, medicine.medical_specialty, Adolescent, [SDV.GEN.GH] Life Sciences [q-bio]/Genetics/Human genetics, Contractility, Young Adult, Brain damage, 03 medical and health sciences, [SDV.MHEP.CSC]Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system, GNB5variants, [SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], Internal medicine, Exome Sequencing, Heart rate, Genetics, Animals, Humans, business.industry, Gene Expression Profiling, Heart beat, Proteins, Cardiac arrhythmia, Arrhythmias, Cardiac, GNB5 variant, medicine.disease, Mice, Inbred C57BL, Autonomic nervous system, 030104 developmental biology, Endocrinology, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, Mutation, Lesions cerebrals, cardiac conduction anomalie, business, Proteïnes, 030217 neurology & neurosurgery
Abstract

BackgroundPathogenic variants of GNB5 encoding the β5 subunit of the guanine nucleotide-binding protein cause IDDCA syndrome, an autosomal recessive neurodevelopmental disorder associated with cognitive disability and cardiac arrhythmia, particularly severe bradycardia.MethodsWe used echocardiography and telemetric ECG recordings to investigate consequences of Gnb5 loss in mouse.ResultsWe delineated a key role of Gnb5 in heart sinus conduction and showed that Gnb5-inhibitory signalling is essential for parasympathetic control of heart rate (HR) and maintenance of the sympathovagal balance. Gnb5−/− mice were smaller and had a smaller heart than Gnb5+/+ and Gnb5+/−, but exhibited better cardiac function. Lower autonomic nervous system modulation through diminished parasympathetic control and greater sympathetic regulation resulted in a higher baseline HR in Gnb5−/− mice. In contrast, Gnb5−/− mice exhibited profound bradycardia on treatment with carbachol, while sympathetic modulation of the cardiac stimulation was not altered. Concordantly, transcriptome study pinpointed altered expression of genes involved in cardiac muscle contractility in atria and ventricles of knocked-out mice. Homozygous Gnb5 loss resulted in significantly higher frequencies of sinus arrhythmias. Moreover, we described 13 affected individuals, increasing the IDDCA cohort to 44 patients.ConclusionsOur data demonstrate that loss of negative regulation of the inhibitory G-protein signalling causes HR perturbations in Gnb5−/− mice, an effect mainly driven by impaired parasympathetic activity. We anticipate that unravelling the mechanism of Gnb5 signalling in the autonomic control of the heart will pave the way for future drug screening.

Published
2020

21. Erratum: Biallelic Mutations in ADPRHL2, Encoding ADP-Ribosylhydrolase 3, Lead to a Degenerative Pediatric Stress-Induced Epileptic Ataxia Syndrome (The American Journal of Human Genetics (2018) 103(3) (431–439), (S0002929718302374), (10.1016/j.ajhg.2018.07.010))

Author

Ghosh, S. G., Becker, K., Huang, H., Salazar, T. D., Chai, G., Salpietro, V., Al-Gazali, L., Waisfisz, Q., Wang, H., Vaux, K. K., Stanley, V., Manole, A., Akpulat, U., Weiss, M. M., Efthymiou, S., Hanna, M. G., Minetti, C., Striano, P., Pisciotta, L., De Grandis, E., Altmuller, J., Weixler, L., Nurnberg, P., Thiele, H., Yis, U., Okur, T. D., Polat, A. I., Amiri, N., Doosti, M., Karimani, E. G., Toosi, M. B., Haddad, G., Karakaya, M., Wirth, B., van Hagen, J. M., Wolf, N. I., Maroofian, R., Houlden, H., Cirak, S., Gleeson, J. G., Human genetics, Pediatric surgery, Amsterdam Neuroscience - Cellular & Molecular Mechanisms, and Amsterdam Reproduction & Development (AR&D)

Abstract

(The American Journal of Human Genetics 103, 431–439; September 6, 2018) Lisa Weixler has been added to the author list for her experimental and scientific contributions to the biophysical analysis of wild-type and mutant proteins. Her contributions were already mentioned in the acknowledgments. The authors apologize for initially only listing her in the acknowledgments and for the inconvenience. The author list has been corrected online and appears correctly here, and Lisa Weixler's affiliation is indicated as footnote 3: Center for Molecular Medicine Cologne, Cologne, Germany.

Published
2021

24. Alternative genomic diagnoses for individuals with a clinical diagnosis of Dubowitz syndrome

Author

Dyment, D. A. (David A.), O'Donnell-Luria, A. (Anne), Agrawal, P. B. (Pankaj B.), Coban Akdemir, Z. (Zeynep), Aleck, K. A. (Kyrieckos A.), Antaki, D. (Danny), Al Sharhan, H. (Hind), Au, P. B. (Ping-Yee B.), Aydin, H. (Hatip), Beggs, A. H. (Alan H.), Bilguvar, K. (Kaya), Boerwinkle, E. (Eric), Brand, H. (Harrison), Brownstein, C. A. (Catherine A.), Buyske, S. (Steve), Chodirker, B. (Bernard), Choi, J. (Jungmin), Chudley, A. E. (Albert E.), Clericuzio, C. L. (Carol L.), Cox, G. F. (Gerald F.), Curry, C. (Cynthia), De Boer, E. (Elke), De Vries, B. B. (Bert B. A.), Dunn, K. (Kathryn), Dutmer, C. M. (Cullen M.), England, E. M. (Eleina M.), Fahrner, J. A. (Jill A.), Geckinli, B. B. (Bilgen B.), Genetti, C. A. (Casie A.), Gezdirici, A. (Alper), Gibson, W. T. (William T.), Gleeson, J. G. (Joseph G.), Greenberg, C. R. (Cheryl R.), Hall, A. (April), Hamosh, A. (Ada), Hartley, T. (Taila), Jhangiani, S. N. (Shalini N.), Karaca, E. (Ender), Kernohan, K. (Kristin), Lauzon, J. L. (Julie L.), Lewis, M. E. (M. E. Suzanne), Lowry, R. B. (R. Brian), López-Giráldez, F. (Francesc), Matise, T. C. (Tara C.), McEvoy-Venneri, J. (Jennifer), McInnes, B. (Brenda), Mhanni, A. (Aziz), Garcia Minaur, S. (Sixto), Moilanen, J. (Jukka), Nguyen, A. (An), Nowaczyk, M. J. (Malgorzata J. M.), Posey, J. E. (Jennifer E.), Õunap, K. (Katrin), Pehlivan, D. (Davut), Pajusalu, S. (Sander), Penney, L. S. (Lynette S.), Poterba, T. (Timothy), Prontera, P. (Paolo), Rodovalho Doriqui, M. J. (Maria Juliana), Sawyer, S. L. (Sarah L.), Sobreira, N. (Nara), Stanley, V. (Valentina), Torun, D. (Deniz), Wargowski, D. (David), Witmer, P. D. (P. Dane), Wong, I. (Isaac), Xing, J. (Jinchuan), Zaki, M. S. (Maha S.), Zhang, Y. (Yeting), C. C. (Care4Rare Consortium), C. F. (Centers For Mendelian Genomics), Boycott, K. M. (Kym M.), Bamshad, M. J. (Michael J.), Nickerson, D. A. (Deborah A.), Blue, E. E. (Elizabeth E.), and Innes, A. M. (A. Micheil)

Subjects
genetic heterogeneity, genome sequencing, Dubowitz syndrome, exome sequencing, microarray
Abstract

Dubowitz syndrome (DubS) is considered a recognizable syndrome characterized by a distinctive facial appearance and deficits in growth and development. There have been over 200 individuals reported with Dubowitz or a “Dubowitz-like” condition, although no single gene has been implicated as responsible for its cause. We have performed exome (ES) or genome sequencing (GS) for 31 individuals clinically diagnosed with DubS. After genome-wide sequencing, rare variant filtering and computational and Mendelian genomic analyses, a presumptive molecular diagnosis was made in 13/27 (48%) families. The molecular diagnoses included biallelic variants in SKIV2L, SLC35C1, BRCA1, NSUN2; de novo variants in ARID1B, ARID1A, CREBBP, POGZ, TAF1, HDAC8, and copy-number variation at1p36.11(ARID1A), 8q22.2(VPS13B), Xp22, and Xq13(HDAC8). Variants of unknown significance in known disease genes, and also in genes of uncertain significance, were observed in 7/27 (26%) additional families. Only one gene, HDAC8, could explain the phenotype in more than one family (N = 2). All but two of the genomic diagnoses were for genes discovered, or for conditions recognized, since the introduction of next-generation sequencing. Overall, the DubS-like clinical phenotype is associated with extensive locus heterogeneity and the molecular diagnoses made are for emerging clinical conditions sharing characteristic features that overlap the DubS phenotype.

Published
2021

34. Abstract P6-08-17: Pregnancy associated breast cancer: Evaluating maternal outcomes. A multicentre study

Author

Prior, L, primary, Teo, M, additional, Greally, M, additional, Ward, C, additional, O'Leary, C, additional, Aslam, R, additional, Darwish, W, additional, Ahmed, N, additional, Watson, G, additional, Kelly, D, additional, Kiely, L, additional, Hassan, A, additional, Gleeson, J, additional, Featherstone, H, additional, Lim, M, additional, Murray, H, additional, Gallagher, D, additional, Westrup, J, additional, Hennessy, B, additional, Leonard, G, additional, Grogan, L, additional, Breathnach, O, additional, Horgan, A, additional, Coate, L, additional, O'Mahony, D, additional, O'Reilly, S, additional, Gupta, R, additional, Keane, M, additional, Duffy, K, additional, O'Connor, M, additional, Kennedy, J, additional, McCaffrey, J, additional, Higgins, M, additional, Kelly, C, additional, Carney, D, additional, Gullo, G, additional, Crown, J, additional, and Walshe, J, additional

Published
2018
Full Text
View/download PDF

40. Publicity And The Pill

Author

Swyer, G. I. M., Drewer, R. W., Cosham, Margaret, Stephens, Sheila, Emerson, M. Shirley, Johnman, Lewis, Mason, H. K., Kay, Peter G., Noble, Margaret B., Kenworthy-Browne, J. M., Gleeson, J. B., Grainger, Leslie, Tomlinson, K. A., Slee, M. A., Ewing, A. Y., Drury, John, Taylor, Geoffrey A., Kay, D. P., Horton, Geoffrey R., Stein, G., Wigdahl, J. D., Neaves, C. H., Bartlett, M., and Brown, C. K.

Published
1969

45. Electricity Exchange: Demand Side Unit performance monitoring

Author

Bokharaie, V., Carroll, P., Devine, M., Fennell, P., Gleeson, J., Hayes, K., Hunter, G., Idiak, J., Lee, W., Lynch, J., Mason, J., Nowotarski, J., O'Connoll, M., O'Sullivan, D., Tomczyk, J., Ward, J., Yan, L., and Finn, P.

Abstract

Demand Side Response management encourages elec- tricity demand reduction during peak hours. One avenue for achieving this is through Demand Side Units (DSUs). These are large electricity consumers who can afford to reduce their demand on the electricity grid when required. Issues with DSUs revolve around verification that the correct demand reduction takes place, with limited monitoring capabilities from the electrical grid operator Eir- Grid. This issue is studied here with the current methods thoroughly analysed and new methods proposed. In this report six different forecasting methods are presented, and their accuracy is compared using two different error metrics. Due to inherent stochasticity in demand it is found that there is no one fore- casting method which is unequivocally best, but the ‘Keep it simple’ weekly and the temperature dependent models are identified as the most promising models to pursue. Initial investigations suggest that a ‘proxy day’ mechanism may be preferable to the current method of verifying that the correct demand reduction takes place.

Published
2013

46. Fluctuation Modes of a Twist-Bend Nematic Liquid Crystal

Author

Parsouzi, Z., primary, Shamid, S. M., additional, Borshch, V., additional, Challa, P. K., additional, Baldwin, A. R., additional, Tamba, M. G., additional, Welch, C., additional, Mehl, G. H., additional, Gleeson, J. T., additional, Jakli, A., additional, Lavrentovich, O. D., additional, Allender, D. W., additional, Selinger, J. V., additional, and Sprunt, S., additional

Published
2016
Full Text
View/download PDF

49. Using policy analysis to explore the reciprocal impact of health policy on public health nursing and public health nursing on policy

Author

Gleeson, J A

Subjects
nw
Abstract

The overall aim of this study was to explore the reciprocal impact of health policy on public health nursing and public health nursing on policy. This study uses a new approach to considering public health nurses’ engagement in policy: one which puts public health nurses, as actors in the policy process, at the centre of the investigation. The overall philosophical lens through which the research was conducted was critical social theory and the methodology was a grounded theory influenced research design. The study adopted a three stage data collection and analysis process: primary data (questionnaires and interviews), detailed policy analyses of two specific White Papers and secondary data (extant documents). The data were collected and analysed through a grounded theory approach in order to answer four research questions: 1. What do public health nurses know about policy, specifically in relation to two English Department of Health White Papers: Creating A Patient-Led NHS (DOH 2005) and Our Health, Our Care, Our Say (DOH 2006)? 2. How do they engage in the policy process? 3. What affects their implementation of policy? 4. Is there a policy-practice gap? A triangulated approach to data collection and analysis was used. Primary data were collected through questionnaires and follow up telephone interviews with public health nurses (health visitors and school nurses) in four PCTs and one social enterprise in five different geographical areas of England. Further data from detailed policy analyses using frameworks by Popple and Leighninger (2008) and Walt and Gilson (1994) were also considered. Finally, secondary data from extant documents including newspapers, websites and organisational documents were reviewed. At the end of the research process, it was possible to answer the four research questions. In addition to this, new knowledge and theory emerged around three main themes: i) A proposal for a new combined framework for policy analysis which leads to a comprehensive and analytical account of policy content and context combined with a detailed consideration of the role of public health nurses as actors in the policy process. ii) Theories as to why and how public health nurses lack influence in the policy process. iii) Analysis of the effect of lack of resources on inhibiting practice innovation in response to policy agendas. Consideration of these theories led to several recommendations for practice. Throughout the research process, there was continued interaction between the three phases of data collection, analysis and theory development.

Published
2013

50. Oral Rivaroxaban for the Treatment of Symptomatic Pulmonary Embolism

Author

Agnelli, G, Berkowitz, S, Bounameaux, H, Büller, Hr, Cohen, A, Gallus, A, Lensing, Aw, Misselwitz, F, Haskell, L, Prins, Mh, Raskob, G, Schellong, S, Bauersachs, R, van Bellen, B, Boda, Z, Borris, L, Brenner, B, Brighton, T, Chlumsky, J, Davidson, B, Decousus, H, Eriksson, H, Jacobson, B, Kakkar, A, Kwong, Yl, Lee, Lh, Meijer, K, van der Meer, J, Minar, E, Monreal, M, Piovella, F, Sandset, Pm, Smith, M, Tomkowski, W, Verhamme, P, Wang, Y, Wells, P, Brandjes, D, Mac Gillavry, M, Otten, Hm, Carlsson, A, Laporte, S, Schulman, S, Gent, M, Turpie, A, Martinelli, I, Segers, A, Muhlhofer, E, Tewes, M, Trajanovic, M, Muller, K, Kim, C, Gebel, M, Benson, A, Pap, Af, Godrie, J, Horvat Broecker, A, Spadari, G, Peters Wulf, C, Roig, J, Baker, R, Bianchi, A, Blombery, P, Campbell, P, Carroll, P, Geraghty, R, Chong, B, Ramanathan, S, Archis, C, Coughlin, P, Salem, H, Crispin, P, Dean, M, Soni, R, Denaro, C, Kubler, P, Coghlan, D, Gan, Te, Tran, H, Coleman, C, Jackson, D, Khalafallah, A, Leahy, M, Leyden, M, Leyden, D, Sturtz, C, Mccann, A, Gibbs, H, Mcrae, S, Richards, B, Ward, C, Curnow, J, Baghestanian, M, Erdogmus, B, Samaha, E, Nikoupayan Mofrad, M, Hirschl, M, Sturm, W, Kirchmair, R, Marschang, P, Drexel, H, Mathies, R, Pilger, E, Brodmann, M, Weltermann, A, Buche, M, Demelenne, J, Gustin, M, Hainaut, P, Pothen, L, de Leersnyder, J, Motte, S, Schroë, H, Sprynger, M, Peerlinck, K, Delcroix, M, Vermassen, F, Verstraeten, P, Smet, V, Vossaert, R, Panico, M, Costa, C, Blondal, J, Kovacs, M, Rodger, M, Carrier, M, Wong, T, Bi, J, Chen, Z, Chen, R, Jing, Zc, He, J, Liu, C, Liu, S, Long, S, Ma, Y, Shao, Y, Wang, C, Yang, Yh, Xie, C, Xu, J, Ying, K, Zhihong, L, Hola, D, Jirat, S, Vitovec, M, Kovářová, K, Gilík, J, Dosál, J, Mandakova, E, Matoška, P, Podpera, I, Podperova, M, Spacek, R, Urbanova, R, Tuxen, C, Sukles, K, Pietila, K, Vesanen, M, Achkar, A, Agraou, B, Aquilanti, S, Rifaï, A, Berremili, T, Brisot, D, Brousse, C, Tarodo, P, Bura, A, Amid Lacombe, C, Malloizel, J, Boulon, C, Alavoine, L, Crestani, B, Mismetti, P, Buchmuller, A, Accassat, S, Elias, A, Elias, M, Emmerich, J, Ferrari, E, Guérin, T, Beaka, P, Lacroix, P, Szwebel, Ta, Benhamou, Y, de Maistre, E, Falvo, N, Mahe, I, Meneveau, N, Schiele, F, Meyer, G, Sanchez, O, Planquette, B, Mottier, D, Le Moigne, E, Couturaud, F, Parent, F, Pernod, G, Imbert, B, Elkouri, D, Dary, M, Queguiner, A, Quere, I, Galanaud, Jp, Roy, Pm, de Boisjolly Bonnefoi JM, Schmidt, J, Breuil, N, Heuser, S, Sevestre, Ma, Simoneau, G, Bergmann, Jf, Stephan, D, Trinh Duc, A, Gaillardou, A, Grange, C, Fassier, T, Wahl, D, Baron Von Bilderling, P, Kuhlencordt, P, Beyer Westendorf, J, Halbritter, K, Werth, S, Diehm, C, Lawall, H, Eifrig, B, Espinola Klein, C, Weisser, G, Giannitsis, E, Haering, Hu, Hasslacher, C, Herrmann, T, Hoffmann, U, Czihal, M, Horacek, T, Ibe, M, Bauer, A, Kieback, A, Landgraf, H, Lindhoff Last, E, Malyar, N, Petermann, W, Potratz, J, Ranft, J, Röcken, M, Pomper, L, Frommhold, R, Schwaiblmair, M, Berghaus, T, Taute, B, Lau, Yk, Tse, E, Olah, Z, Farkas, K, Kolossváry, E, Gurzó, M, Kis, E, Kovács, A, Landi, A, Lupkovics, G, Pecsvarady, Z, Riba, M, Sipos, G, Parakh, R, Sembiring, R, Barton, J, Goldstein, L, Gavish, D, Hoffman, R, Hussein, O, Inbal, A, Lishner, M, Elis, A, Lugassy, G, Varon, D, Zeltser, D, Rogowski, O, Steinvil, A, Zisman, D, Ageno, W, Ambrosio, G, Cattaneo, M, D'Angelo, A, Ghirarduzzi, A, Lotti, M, Pierfranceschi, Mg, Lodigiani, C, Palareti, G, Barone, M, Beltrametti, C, Porreca, E, Prandoni, Paolo, Spiezia, L, Quintavalla, R, Cho, Wh, Ha, Jw, Kim, Hs, Park, K, Sime, I, Miliauskas, S, Petrauskiene, R, Sathar, J, Beeker, A, Ten Cate, H, De Groot, M, Kamphuisen, P, Douma, R, Kooy, Mv, Coenen, J, Mäkelburg, A, Knol, M, Tichelaar, V, Harper, P, Knottenbelt, E, Ockelford, P, Young, L, Royle, G, Simpson, D, Chunilal, S, Ghanima, W, Foyn, S, Tveit, A, Abola, Mt, Adamiec, R, Gorski, P, Kloczko, J, Lewczuk, J, Nowak, M, Musial, J, Wronski, J, Ng, Hj, Adler, D, Becker, Jh, Ellis, G, Isaacs, R, Bloy, B, Allie, R, Eckstein, F, van Rensburg JH, Schmidt, S, Siebert, H, Zyl, L, Carrera, M, Del Campo, F, Diego, I, Garcia Bragado, F, Jiménez, D, Sánchez Álvarez, J, Redondo, M, Roman Sanchez, P, Villalta, J, Villegas Scivetti, M, Jonson, T, Tygesen, H, Lapidus, L, Ottosson, E, Själander, A, Asmis, L, Banyai, M, Heidemann, M, Baumgartner, I, Righini, M, Frank, U, Hayoz, D, Periard, D, Chang, Wt, Chiu, K, Wang, Ky, Weng, Zc, Angchaisuksiri, P, Pothirat, C, Rojnuckarin, P, Solis, J, Hunt, B, Luckit, J, Albrecht, C, Banish, D, Feinbloom, D, Botnick, W, Chen, D, Dexter, J, Ettinger, N, Gleeson, J, Jaffer, A, Joseph, S, Kennedy, M, Krell, K, Lavender, R, Lyons, R, Moll, S, Nadar, V, Darrow, K, Hardman, V, Rathbun, S, Rehm, J, Rodriguez Cintron, W, Stevens, K, Wright, P, Ramaswamy, M., ACS - Amsterdam Cardiovascular Sciences, Vascular Medicine, Other departments, Epidemiologie, MUMC+: KIO Kemta (9), RS: CAPHRI School for Public Health and Primary Care, Department of Vascular Medicine (DVM - AMC), Academic Medical Center - Academisch Medisch Centrum [Amsterdam] (AMC), University of Amsterdam [Amsterdam] (UvA)-University of Amsterdam [Amsterdam] (UvA), Department of Epidemiology (MHP), Maastricht University [Maastricht], Groupe de recherche sur la thrombose (GRT (EA 3065)), Université Jean Monnet [Saint-Étienne] (UJM), Service d'angiologie et d'hémostase (MR), Hôpital Universitaire de Genève, Groupe d'Etude de la Thrombose de Bretagne Occidentale (GETBO), Université de Brest (UBO)-Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO)-Université de Brest (UBO), Centre d'Investigation Clinique (CIC - Brest), and Université de Brest (UBO)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
MESH: Pulmonary Embolism, Male, Vitamin K, Administration, Oral, Pulmonary Embolism/drug therapy/mortality, Kaplan-Meier Estimate, 030204 cardiovascular system & hematology, chemistry.chemical_compound, 0302 clinical medicine, Rivaroxaban, Edoxaban, Recurrence, Hemorrhage/chemically induced, 030212 general & internal medicine, Vitamin K/antagonists & inhibitors, Enoxaparin/adverse effects/therapeutic use, MESH: Treatment Outcome, MESH: Aged, ddc:616, MESH: Middle Aged, Hazard ratio, General Medicine, MESH: Follow-Up Studies, Vitamin K antagonist, MESH: Thiophenes, Middle Aged, Thrombosis, Morpholines/adverse effects/therapeutic use, 3. Good health, Pulmonary embolism, MESH: International Normalized Ratio, Treatment Outcome, Anesthesia, MESH: Administration, Oral, Administration, Combination, Apixaban, Drug Therapy, Combination, Female, MESH: Hemorrhage, medicine.drug, Oral, MESH: Enoxaparin, medicine.drug_class, Morpholines, Anticoagulants/adverse effects/therapeutic use, MESH: Morpholines, Hemorrhage, Thiophenes, MESH: Anticoagulants, 03 medical and health sciences, Drug Therapy, medicine, Humans, International Normalized Ratio, Enoxaparin, MESH: Kaplan-Meier Estimate, Aged, MESH: Humans, business.industry, MESH: Vitamin K, Anticoagulants, medicine.disease, MESH: Male, MESH: Recurrence, Regimen, MESH: Drug Therapy, Combination, chemistry, Thiophenes/adverse effects/therapeutic use, business, Pulmonary Embolism, MESH: Female, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, Follow-Up Studies
Abstract

International audience; BACKGROUND: A fixed-dose regimen of rivaroxaban, an oral factor Xa inhibitor, has been shown to be as effective as standard anticoagulant therapy for the treatment of deep-vein thrombosis, without the need for laboratory monitoring. This approach may also simplify the treatment of pulmonary embolism. METHODS: In a randomized, open-label, event-driven, noninferiority trial involving 4832 patients who had acute symptomatic pulmonary embolism with or without deep-vein thrombosis, we compared rivaroxaban (15 mg twice daily for 3 weeks, followed by 20 mg once daily) with standard therapy with enoxaparin followed by an adjusted-dose vitamin K antagonist for 3, 6, or 12 months. The primary efficacy outcome was symptomatic recurrent venous thromboembolism. The principal safety outcome was major or clinically relevant nonmajor bleeding. RESULTS: Rivaroxaban was noninferior to standard therapy (noninferiority margin, 2.0; P=0.003) for the primary efficacy outcome, with 50 events in the rivaroxaban group (2.1%) versus 44 events in the standard-therapy group (1.8%) (hazard ratio, 1.12; 95% confidence interval [CI], 0.75 to 1.68). The principal safety outcome occurred in 10.3% of patients in the rivaroxaban group and 11.4% of those in the standard-therapy group (hazard ratio, 0.90; 95% CI, 0.76 to 1.07; P=0.23). Major bleeding was observed in 26 patients (1.1%) in the rivaroxaban group and 52 patients (2.2%) in the standard-therapy group (hazard ratio, 0.49; 95% CI, 0.31 to 0.79; P=0.003). Rates of other adverse events were similar in the two groups. CONCLUSIONS: A fixed-dose regimen of rivaroxaban alone was noninferior to standard therapy for the initial and long-term treatment of pulmonary embolism and had a potentially improved benefit-risk profile. (Funded by Bayer HealthCare and Janssen Pharmaceuticals; EINSTEIN-PE ClinicalTrials.gov number, NCT00439777.).

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results