Coherent J/psi photoproduction in ultra-peripheral PbPb collisions at root s(NN)=2.76 TeV with the CMS experiment

Peer reviewe

Upsilon (nS) polarizations versus particle multiplicity in pp collisions at root s=7 TeV

Peer reviewe

Search for new long-lived particles at root s=13 TeV

A search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb(-1) collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper decay lengths between 70-100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550-1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm. (C) 2018 The Author(s). Published by Elsevier B.V.Peer reviewe

Constraints on anomalous Higgs boson couplings using production and decay information in the four-lepton final state

© 2017 The Author A search is performed for anomalous interactions of the recently discovered Higgs boson using matrix element techniques with the information from its decay to four leptons and from associated Higgs boson production with two quark jets in either vector boson fusion or associated production with a vector boson. The data were recorded by the CMS experiment at the LHC at a center-of-mass energy of 13TeV and correspond to an integrated luminosity of 38.6fb −1 . They are combined with the data collected at center-of-mass energies of 7 and 8TeV, corresponding to integrated luminosities of 5.1 and 19.7fb −1 , respectively. All observations are consistent with the expectations for the standard model Higgs boson

HIV testing rates among pregnant women in Managua, Nicaragua, 2010-2011

To determine and report the rate and pattern of HIV testing among pregnant women receiving ambulatory prenatal care, and the total number of positive cases in pregnant women in Managua, Nicaragua. A retrospective epidemiological review was conducted to assess HIV testing rates among pregnant women in Managua attending district-level health centers in 2010 and 2011, with a focus on a single district (District 6.1). A total of 39.4% of pregnant women receiving prenatal care at Managua health centers in 2010 received an HIV test, and this number increased to 49.8% in 2011 (P < 0.001; phi statistic, 0.10). In 2010, 27 pregnant women in Managua were found to be HIV positive, corresponding to 0.17% of those who were tested. In 2011, 31 tested positive (0.12% of those who were tested). Comparisons between 2010 and 2011 at the District 6.1 level reflect an increase in women who received HIV tests from 24.2% in 2010 to 49.3% in 2011 (P < 0.001; phi statistic, 0.26). In District 6.1, two pregnant women were identified as HIV positive in 2010 and three in 2011, corresponding to 0.32% and 0.13% of pregnant women tested, respectively. Despite significant improvements in HIV testing rates from 2010 to 2011, the numbers tested remain below the goal recommended by the Pan American Health Organization (PAHO) in order to achieve virtual elimination of mother-to-child transmission by 2015 (> 95%). Patterns of testing demonstrated increased rates coinciding with a health fair in District 6.1, but effects were short-lived. Therefore, new approaches are necessary to bolster prenatal HIV screening efforts within Managua and District 6.1 in Nicaragua

HIV testing rates among pregnant women in Managua, Nicaragua, 2010-2011 Tasas de realización de pruebas de detección del VIH en mujeres embarazadas en Managua, Nicaragua, 2010-2011

OBJECTIVE: To determine and report the rate and pattern of HIV testing among pregnant women receiving ambulatory prenatal care, and the total number of positive cases in pregnant women in Managua, Nicaragua. METHODS: A retrospective epidemiological review was conducted to assess HIV testing rates among pregnant women in Managua attending district-level health centers in 2010 and 2011, with a focus on a single district (District 6.1). RESULTS: A total of 39.4% of pregnant women receiving prenatal care at Managua health centers in 2010 received an HIV test, and this number increased to 49.8% in 2011 (P < 0.001; phi statistic, 0.10). In 2010, 27 pregnant women in Managua were found to be HIV positive, corresponding to 0.17% of those who were tested. In 2011, 31 tested positive (0.12% of those who were tested). Comparisons between 2010 and 2011 at the District 6.1 level reflect an increase in women who received HIV tests from 24.2% in 2010 to 49.3% in 2011 (P < 0.001; phi statistic, 0.26). In District 6.1, two pregnant women were identified as HIV positive in 2010 and three in 2011, corresponding to 0.32% and 0.13% of pregnant women tested, respectively. CONCLUSIONS: Despite significant improvements in HIV testing rates from 2010 to 2011, the numbers tested remain below the goal recommended by the Pan American Health Organization (PAHO) in order to achieve virtual elimination of mother-to-child transmission by 2015 (> 95%). Patterns of testing demonstrated increased rates coinciding with a health fair in District 6.1, but effects were short-lived. Therefore, new approaches are necessary to bolster prenatal HIV screening efforts within Managua and District 6.1 in Nicaragua.<br>OBJETIVO: Determinar y notificar la tasa de realización de pruebas de detección del VIH, los patrones obtenidos y el número de casos positivos en las mujeres embarazadas que recibieron asistencia prenatal ambulatoria, en Managua, Nicaragua. MÉTODOS: Se llevó a cabo un examen epidemiológico retrospectivo para evaluar las tasas de realización de pruebas de detección del VIH en mujeres embarazadas que acudieron a centros de salud de distrito en Managua en el 2010 y el 2011, centrándose en un solo distrito (distrito 6.1). RESULTADOS: El 39,4% de las mujeres embarazadas que recibieron asistencia prenatal en los centros de salud de Managua en el 2010 se sometieron a pruebas de detección del VIH, y esta cifra aumentó a 49,8% en 2011 (P <0,001; &#981; = 0,10). En el 2010, 27 mujeres embarazadas de Managua presentaron resultados positivos en las pruebas de detección del VIH, lo que corresponde a 0,17% de las que se sometieron a estas pruebas; en el 2011, 31 tuvieron resultados positivos, es decir, 0,12% de las embarazadas a las que se realizaron pruebas de detección del VIH. Las comparaciones entre el 2010 y el 2011 en el distrito 6.1 reflejan un aumento de las mujeres que se sometieron a pruebas de detección del VIH de 24,2% en 2010 a 49,3% en 2011 (P < 0,001; &#981; = 0,26). En ese distrito, 2 mujeres embarazadas presentaron resultados positivos en el 2010 y 3 en el 2011, lo que corresponde, respectivamente, a 0,32% y 0,13% de las mujeres embarazadas a las que se les realizaron dichas pruebas. CONCLUSIONES: A pesar de las mejoras considerables en las tasas de realización de pruebas de detección del VIH entre el 2010 y el 2011, las cifras se mantuvieron por debajo de la meta recomendada (> 95%) por la Organización Panamericana de la Salud (OPS) para lograr la eliminación virtual de la transmisión maternoinfantil para el 2015. Los patrones de realización de pruebas evidenciaron que las tasas aumentaron en coincidencia con una feria de salud en el distrito 6.1, aunque los efectos duraron poco. Por consiguiente, es necesario utilizar nuevas estrategias para reforzar las pruebas de detección sistemática del VIH prenatales en Managua y en el distrito 6.1

Identification of the Magna Radicular Artery Entry Foramen and Adamkiewicz System: Patient Selection for Open versus Full-Endoscopic Thoracic Spinal Decompression Surgery

Background: Casually cauterizing the radicular magna during routine thoracic discectomy may have dire consequences. Methods: We performed a retrospective observational cohort study on patients scheduled for decompression of symptomatic thoracic herniated discs and spinal stenosis who underwent a preoperative computed tomography angiography (CTA) to assess the surgical risks by anatomically defining the foraminal entry level of the magna radicularis artery into the thoracic spinal cord and its relationship to the surgical level. Results: Fifteen patients aged 58.53 ± 19.57, ranging from 31 to 89 years, with an average follow-up of 30.13 ± 13.42 months, were enrolled in this observational cohort study. The mean preoperative VAS for axial back pain was VAS of 8.53 ± 2.06 and reduced to a postoperative VAS of 1.60 ± 0.92 (p < 0.0001) at the final follow-up. The Adamkiewicz was most frequently found at T10/11 (15.4%), T11/12 (23.1%), and T9/10 (30.8%). There were eight patients where the painful pathology was found far from the AKA foraminal entry-level (type 1), three patients with near location (type 2), and another four patients needing decompression at the foraminal (type 3) entry-level. In five of the fifteen patients, the magna radicularis entered the spinal canal on the ventral surface of the exiting nerve root through the neuroforamen at the surgical level requiring a change of surgical strategy to prevent injury to this important contributor to the spinal cord’s blood supply. Conclusions: The authors recommend stratifying patients according to the proximity of the magna radicularis artery to the compressive pathology with CTA to assess the surgical risk with targeted thoracic discectomy methods

Influence of immune activation on the risk of allograft rejection in human immunodeficiency virus-infected kidney transplant recipients

BACKGROUND: HIV infection is associated with high rates of acute rejection following kidney transplantation. The underlying mechanisms for such predisposition are incompletely understood. Pathological immune activation is a hallmark of chronic HIV infection that persists despite effective antiretroviral therapy. We hypothesized that the baseline levels of T cell activation in HIV(+) candidates would correlate with their risk of acute rejection following kidney transplantation. METHODS: Single-center retrospective cohort analysis of HIV(+) adult kidney transplants performed between October 2006 and September 2013. The frequency of CD3(+)HLA-DR(+) cells measured by flow cytometry served as a surrogate marker of immune activation. Patients were categorized into tertiles of activation, and the rates of biopsy-proven acute rejection were compared across groups. RESULTS: (1) Compared to matched HIV(−) controls, the baseline number of CD3(+)HLA-DR(+) cells was higher in HIV(+) kidney transplant candidates. (2) Abnormally high levels of activation did not decrease with transplant-associated immunosuppression. (3) Patients categorized within the lower and middle CD3(+)HLA-DR(+) tertiles had higher probability of rejection during the first 3 years post-transplant compared to those in the higher activation tertile (36.9% vs. 0%; log-rank P= .04). CONCLUSIONS: Pathological immune activation in HIV(+) transplant candidates does not explain their increased susceptibility to allograft rejection. Paradoxically, those with the highest levels of immune activation seem to be less prone to rejection

Impact of antiretroviral therapy on clinical outcomes in HIV+ kidney transplant recipients: Review of 58 cases [version 1; referees: 2 approved]

Background: Antiretroviral therapy (ART) poses challenging drug-drug interactions with immunosuppressant agents in transplant recipients.  We aimed to determine the impact of specific antiretroviral regimens in clinical outcomes of HIV+ kidney transplant recipients. Methods: A single-center, retrospective cohort study was conducted at a large academic center. Subjects included 58 HIV- to HIV+ adult, first-time kidney transplant patients. The main intervention was ART regimen used after transplantation.  The main outcomes assessed at one- and three-years were: patient survival, death-censored graft survival, and biopsy-proven acute rejection; we also assessed serious infections within the first six months post-transplant. Results: Patient and graft survival at three years were both 90% for the entire cohort. Patients receiving protease inhibitor (PI)-containing regimens had lower patient survival at one and three years than patients receiving PI-sparing regimens: 85% vs. 100% (p=0.06) and 82% vs. 100% (p=0.03), respectively. Patients who received PI-containing regimens had twelve times higher odds of death at 3 years compared to patients who were not exposed to PIs (odds ratio, 12.05; 95% confidence interval, 1.31-1602; p=0.02).  Three-year death-censored graft survival was lower in patients receiving PI vs. patients on PI-sparing regimens (82 vs 100%, p=0.03). Patients receiving integrase strand transfer inhibitors-containing regimens had higher 3-year graft survival. There were no differences in the incidence of acute rejection by ART regimen. Individuals receiving PIs had a higher incidence of serious infections compared to those on PI-sparing regimens (39 vs. 8%, p=0.01). Conclusions: PI-containing ART regimens are associated with adverse outcomes in HIV+ kidney transplant recipients