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Costa M, Horrillo R, Ortiz AM, Pérez A, Mestre A, Núñez L, Páez A, Ruiz AR, Boada M, Grancha S. P3‐240: ALBUMIN OXIDATION IN CSF FROM ALZHEIMER'S DISEASE PATIENTS IS ASSOCIATED WITH ABETA‐42 AND TAU BIOMARKERS AND APOE GENOTYPE. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.1599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Boada M, Rodriguez-Gomez O, Gil S, Sanabria A, Alegret M, Moreno-Grau S, Perez A, Lomeña F, Pavía J, Gismondi R, Bullich S, Vivas A, Chiari MG, Páez A, Núñez L, Hernández-Olasagarre B, Orellana A, Valero S, Ruiz AR, Tarraga L, Monté-Rubio G. P1‐428: APOE STATUS MODULATES BRAIN PATTERNS OF AMYLOID DISTRIBUTION IN INDIVIDUALS WITH SUBJECTIVE COGNITIVE DECLINE (SCD) FROM THE FACEHBI STUDY. Alzheimers Dement 2018. [DOI: 10.1016/j.jalz.2018.06.437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Boada M, Anaya F, Ortiz P, Olazarán J, Shua-Haim JR, Obisesan TO, Hernández I, Muñoz J, Buendia M, Alegret M, Lafuente A, Tárraga L, Núñez L, Torres M, Grifols JR, Ferrer I, Lopez OL, Páez A. Efficacy and Safety of Plasma Exchange with 5% Albumin to Modify Cerebrospinal Fluid and Plasma Amyloid-β Concentrations and Cognition Outcomes in Alzheimer's Disease Patients: A Multicenter, Randomized, Controlled Clinical Trial. J Alzheimers Dis 2018; 56:129-143. [PMID: 27911295 PMCID: PMC5240541 DOI: 10.3233/jad-160565] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background: Studies conducted in animal models and humans suggest the presence of a dynamic equilibrium of amyloid-β (Aβ) peptide between cerebrospinal fluid (CSF) and plasma compartments. Objective: To determine whether plasma exchange (PE) with albumin replacement was able to modify Aβ concentrations in CSF and plasma as well as to improve cognition in patients with mild-moderate Alzheimer’s disease (AD). Methods: In a multicenter, randomized, patient- and rater-blind, controlled, parallel-group, phase II study, 42 AD patients were assigned (1 : 1) to PE treatment or control (sham) groups. Treated patients received a maximum of 18 PE with 5% albumin (Albutein®, Grifols) with three different schedules: two PE/weekly (three weeks), one PE/weekly (six weeks), and one PE/bi- weekly (12 weeks), plus a six-month follow-up period. Plasma and CSF Aβ1–40 and Aβ1–42 levels, as well as cognitive, functional, and behavioral measures were determined. Results: CSF Aβ1–42 levels after the last PE compared to baseline were marginally higher in PE-treated group versus controls (adjusted means of variation: 75.3 versus –45.5 pg/mL; 95% CI: –19.8, 170.5 versus 135.1, 44.2; p = 0.072). Plasma Aβ1–42 levels were lower in the PE-treated group after each treatment period (p < 0.05). Plasma Aβ1–40 levels showed a saw-tooth pattern variation associated with PE. PE-treated patients scored better in the Boston Naming Test and Semantic Verbal Fluency (p < 0.05) throughout the study. Neuropsychiatric Inventory scores were higher in controls during the PE phase (p < 0.05). Conclusion: PE with human albumin modified CSF and plasma Aβ1–42 levels. Patients treated with PE showed improvement in memory and language functions, which persisted after PE was discontinued.
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Boada M, Ramos-Fernández E, Guivernau B, Muñoz F, Costa M, Ortiz A, Jorquera J, Núñez L, Torres M, Páez A. Treatment of Alzheimer disease using combination therapy with plasma exchange and haemapheresis with albumin and intravenous immunoglobulin: Rationale and treatment approach of the AMBAR (Alzheimer Management By Albumin Replacement) study. NEUROLOGÍA (ENGLISH EDITION) 2016. [DOI: 10.1016/j.nrleng.2014.02.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Boada M, Lopez OL, Rodriguez-Gomez O, Núñez L, Torres M, Afonso N, Páez A. P1‐048: Changes in Cognitive Status of Alzheimer’s Disease Patients Treated with Plasma Exchange and Replacement with Human Albumin Plus Immunoglobulin: Interim Global Results of the Ambar Trial. Alzheimers Dement 2016. [DOI: 10.1016/j.jalz.2016.06.795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Arenas-Luna V, Loredo-Mendoza L, Navarro-Betancourt J, Bazán-A C, García-V P, Lara-M L, Gutiérrez-V I, Rodríguez-Rivera E, López-Martínez M, Páez A, Masso F, Hernández S. 453. Tumorigenic Potential in Clones Derived from Rat Bone Marrow Cells. Mol Ther 2016. [DOI: 10.1016/s1525-0016(16)33262-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Pérez-Romero P, Bulnes-Ramos A, Torre-Cisneros J, Gavaldá J, Aydillo T, Moreno A, Montejo M, Fariñas M, Carratalá J, Muñoz P, Blanes M, Fortún J, Suárez-Benjumea A, López-Medrano F, Barranco J, Peghin M, Roca C, Lara R, Cordero E, Alamo J, Gasch A, Gentil-Govantes M, Molina-Ortega F, Lage E, Martínez-Atienza J, Sánchez M, Rosso C, Arizón J, Aguera M, Cantisán S, Montero J, Páez A, Rodríguez A, Santos S, Vidal E, Berasategui C, Campins M, López-Meseguer M, Saez B, Marcos M, Sanclemente G, Diez N, Goikoetxea J, Casafont F, Cobo-Beláustegy M, Durán R, Fábrega-García E, Fernández-Rozas S, González-Rico C, Zurbano-Goñi F, Bodro M, Niubó J, Oriol S, Sabé N, Anaya F, Bouza E, Catalán P, Diez P, Eworo A, Kestler M, Lopez-Roa P, Rincón D, Rodríguez M, Salcedo M, Sousa Y, Valerio M, Morales-Barroso I, Aguado J, Origuen J. Influenza vaccination during the first 6 months after solid organ transplantation is efficacious and safe. Clin Microbiol Infect 2015; 21:1040.e11-8. [DOI: 10.1016/j.cmi.2015.07.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 07/01/2015] [Accepted: 07/17/2015] [Indexed: 10/23/2022]
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Moniruzzaman M, Chudyk A, Páez A, Winters M, Sims-Gould J, McKay H. Travel behavior of low income older adults and implementation of an accessibility calculator. JOURNAL OF TRANSPORT & HEALTH 2015; 2:257-2698. [PMID: 27104148 PMCID: PMC4835234 DOI: 10.1016/j.jth.2015.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Given the aging demographic landscape, the concept of walkable neighborhoods has emerged as a topic of interest, especially during the last decade. However, we know very little about whether walkable neighborhoods promote walking among older adults, particularly those with lower incomes. Therefore in this paper we: (i) examine the relation between trip distance and sociodemographic attributes and accessibility features of lower income older adults in Metro Vancouver; and, (ii) implement a web-based application to calculate the accessibility of lower income older adults in Metro Vancouver based on their travel behavior. We use multilevel linear regression to estimate the determinants of trip length. We find that in this population distance traveled is associated with gender, living arrangements, and dog ownership. Furthermore, significant geographical variations (measured using a trend surface) were also found. To better visualize the impact of travel behavior on accessibility by personal profile and location, we also implemented a web-based calculator that generates an Accessibility (A)-score using Google Maps API v3 that can be used to evaluate the accessibility of neighborhoods from the perspective of older adults.
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Heijnsdijk EAM, de Carvalho TM, Auvinen A, Zappa M, Nelen V, Kwiatkowski M, Villers A, Páez A, Moss SM, Tammela TLJ, Recker F, Denis L, Carlsson SV, Wever EM, Bangma CH, Schröder FH, Roobol MJ, Hugosson J, de Koning HJ. Cost-effectiveness of prostate cancer screening: a simulation study based on ERSPC data. J Natl Cancer Inst 2014; 107:366. [PMID: 25505238 DOI: 10.1093/jnci/dju366] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND The results of the European Randomized Study of Screening for Prostate Cancer (ERSPC) trial showed a statistically significant 29% prostate cancer mortality reduction for the men screened in the intervention arm and a 23% negative impact on the life-years gained because of quality of life. However, alternative prostate-specific antigen (PSA) screening strategies for the population may exist, optimizing the effects on mortality reduction, quality of life, overdiagnosis, and costs. METHODS Based on data of the ERSPC trial, we predicted the numbers of prostate cancers diagnosed, prostate cancer deaths averted, life-years and quality-adjusted life-years (QALY) gained, and cost-effectiveness of 68 screening strategies starting at age 55 years, with a PSA threshold of 3, using microsimulation modeling. The screening strategies varied by age to stop screening and screening interval (one to 14 years or once in a lifetime screens), and therefore number of tests. RESULTS Screening at short intervals of three years or less was more cost-effective than using longer intervals. Screening at ages 55 to 59 years with two-year intervals had an incremental cost-effectiveness ratio of $73000 per QALY gained and was considered optimal. With this strategy, lifetime prostate cancer mortality reduction was predicted as 13%, and 33% of the screen-detected cancers were overdiagnosed. When better quality of life for the post-treatment period could be achieved, an older age of 65 to 72 years for ending screening was obtained. CONCLUSION Prostate cancer screening can be cost-effective when it is limited to two or three screens between ages 55 to 59 years. Screening above age 63 years is less cost-effective because of loss of QALYs because of overdiagnosis.
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Boada M, Ramos-Fernández E, Guivernau B, Muñoz FJ, Costa M, Ortiz AM, Jorquera JI, Núñez L, Torres M, Páez A. Treatment of Alzheimer disease using combination therapy with plasma exchange and haemapheresis with albumin and intravenous immunoglobulin: Rationale and treatment approach of the AMBAR (Alzheimer Management By Albumin Replacement) study. Neurologia 2014; 31:473-81. [PMID: 25023458 DOI: 10.1016/j.nrl.2014.02.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Accepted: 02/02/2014] [Indexed: 10/25/2022] Open
Abstract
INTRODUCTION There is a growing interest in new therapeutic strategies for the treatment of Alzheimer disease (AD) which focus on reducing the beta-amyloid peptide (Aβ) burden in the brain by sequestering plasma Aβ, a large proportion of which is bound to albumin and other proteins. This review discusses the concepts of interaction between Aβ and albumin that have given rise to AMBAR (Alzheimer's Disease Management by Albumin Replacement) project, a new multicentre, randomised, controlled clinical trial for the treatment of AD. DEVELOPMENT Results from preliminary research suggest that Albutein(®) (therapeutic albumin, Grifols) contains no quantifiable levels of Aβ. Studies also show that Albutein(®) has Aβ binding capacity. On the other hand, AD entails a high level of nitro-oxidative stress associated with fibrillar aggregates of Aβ that can induce albumin modification, thus affecting its biological functions. Results from the phase ii study confirm that using therapeutic apheresis to replace endogenous albumin with Albutein(®) 5% is feasible and safe in patients with AD. This process resulted in mobilisation of Aβ and cognitive improvement in treated patients. The AMBAR study will test combination therapy with therapeutic apheresis and haemopheresis with the possible leverage effect of Albutein(®) with intravenous immunoglobulin replacement (Flebogamma(®) DIF). Cognitive, functional, and behavioural changes in patients with mild to moderate AD will be assessed. CONCLUSIONS the AMBAR study represents a new therapeutic perspective for AD.
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Moniruzzaman M, Páez A, Morency C. Compliance potential mapping: a tool to assess potential contributions of walking towards physical activity guidelines. BMC Public Health 2014; 14:511. [PMID: 24885360 PMCID: PMC4076765 DOI: 10.1186/1471-2458-14-511] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Accepted: 05/14/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Walking for transport is increasingly considered an important component for meeting physical activity guidelines. This is true for individuals of all ages, and particularly important for seniors, for whom other physical activities may not be recommended. In order to evaluate the potential contributions of walking to physical activity, in this paper the concept of Compliance Potential Mapping is introduced. The concept is illustrated using seniors as a case study. METHODS Based on estimates of walking trip distance and frequency, estimates of expected total daily walking distance are obtained. These estimates are converted to weekly walking minutes, which are in turn compared to recommended physical activity guidelines for seniors. Once estimates of travel behavior are available, the approach is straightforward and based on relatively simple map algebra operations. RESULTS Compliance Potential Mapping as a tool to assess the potential contributions of walking towards physical activity is demonstrated using data from Montreal's 2008 travel survey. The results indicate that the central parts of Montreal Island display higher potential for compliance with physical activity guidelines, but with variations according to age, income, occupation, possession of driver's license and vehicle, and neighborhood and accessibility parameters. CONCLUSIONS Compliance Potential Maps offer valuable information for public health and transportation planning and policy analysis.
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Luján M, Páez A, Angulo JC, Granados R, Nevado M, Torres GM, Berenguer A. Prostate cancer incidence and mortality in the Spanish section of the European Randomized Study of Screening for Prostate Cancer (ERSPC). Prostate Cancer Prostatic Dis 2014; 17:187-91. [PMID: 24614694 DOI: 10.1038/pcan.2014.7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Revised: 01/13/2014] [Accepted: 01/26/2014] [Indexed: 11/09/2022]
Abstract
BACKGROUND To present the long-term results of a prostate cancer (PC) screening trial conducted in a Mediterranean setting. METHODS A total of 4276 men aged 45-70 years were randomized to screening arm (PSA test performed) and control arm (no tests). Transrectal ultrasonography-guided sextant prostate biopsy was conducted when PSA > or = 3 ng ml(-1). Date and cause of death were retrieved from death certificates. PC incidence, and disease-specific and overall mortality curves were plotted and comparison between arms was made. Analysis of causes of death was also performed. RESULTS Median age at randomization was 57.0 years. Median follow-up time was 15.2 years. A total of 241 men were diagnosed with PC, 161 (6.7%) in the screening arm and 80 (4.3%) in the control arm (P<0.01). Eventually, 554 men (13%) died. No difference in all-cause mortality was found between arms (P=0.34). Only 10 men (10/4276, 0.23%) died from PC, no differences between arms (P=0.67). Overall, the main causes of death were malignancy (54.2%), cardiovascular (17.9%) and respiratory (9.2%) diseases. Main cancer causes of death were lung and bronchus cancer (37.2%), colorectum (15.0%) and stomach (9.0%) cancer. PC only accounted for 3.0% of all malignant causes of death (ranked 10th). CONCLUSIONS Our study failed to demonstrate benefits of PC screening in terms of all-cause and PC-specific mortality after a median follow-up of 15 years. The limited sample size and the low long-term PC mortality observed in our setting were probably the most important factors to explain these results.
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Ramos Amador A, Alcaraz Mexía M, González Preciado J, Fernández Zapardiel S, Salgado R, Páez A. Natural history of lumbar disc hernias: Does gadolinium enhancement have any prognostic value? RADIOLOGIA 2013. [DOI: 10.1016/j.rxeng.2011.10.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lissitchkov T, Matysiak M, Zavilska K, Laguna P, Gercheva L, Antonov A, Moret A, Caunedo P, Aznar JA, Woodward MK, Páez A. Head-to-head comparison of the pharmacokinetic profiles of a high-purity factor IX concentrate (AlphaNine®) and a recombinant factor IX (BeneFIX®) in patients with severe haemophilia B. Haemophilia 2013; 19:674-8. [DOI: 10.1111/hae.12148] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/17/2013] [Indexed: 11/28/2022]
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Ramos Amador A, Alcaraz Mexía M, González Preciado JL, Fernández Zapardiel S, Salgado R, Páez A. [Natural history of lumbar disc hernias: does gadolinium enhancement have any prognostic value?]. RADIOLOGIA 2012; 55:398-407. [PMID: 22818899 DOI: 10.1016/j.rx.2011.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 09/30/2011] [Accepted: 10/30/2011] [Indexed: 11/16/2022]
Abstract
OBJECTIVES To evaluate the percentage of disc hernias that have disappeared after one year of follow-up and the time to disappearance. To determine whether gadolinium enhancement is useful for predicting whether the hernia will disappear. To analyze whether the pattern of enhancement can help predict whether the fragment will disappear. MATERIAL AND METHODS This prospective study included 118 patients with acute symptoms of lumbosciatica and a herniated disc diagnosed by CT. In 72 patients, we performed gadolinium-enhanced MRI every 6 months for one year or until the herniation disappeared; we related the findings of protrusion, extrusion, and the enhancement pattern with the disappearance or persistence of herniated disc material. We analyzed the results with univariate and multivariate statistics. RESULTS The 59% of the hernias disappeared within 1 year of follow-up and 66% disappeared within the first 8 months of follow-up. The 83% of the extruded hernias disappeared, and this was significant in the multivariate analysis (P<.005). The absence of enhancement was significantly associated with the persistence of the hernia in the univariate analysis. The enhancement pattern was not useful for predicting whether the hernia would disappear. Five hernias disappeared within the first two months. CONCLUSIONS A high percentage of disc hernias disappear. We found a significant association between extrusion and disappearance but no correlation between the pattern of gadolinium uptake and the disappearance of the hernia.
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Roca I, Boada‐Rovira M, Cuberas G, Tarraga L, Muñoz J, Grifols JR, Ortiz P, Hernandez I, Buendia M, Anaya F, Olazarán J, Rubio L, Torres G, Bittini A, Guzman J, Torres M, Domenech LN, Ferrer I, Páez A. P3‐403: Longitudinal neuroimaging analysis in Alzheimer's disease after plasma exchange with 5% Grifols albumin (Albutein®). Alzheimers Dement 2012. [DOI: 10.1016/j.jalz.2012.05.2077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sáenz J, Páez A, Alarcón R, Casas J, Sánchez A, Pereira E, Cáncer E, Álvarez M, Rendón D, Durán M. [Obesity as risk factor for lithiasic recurrence]. Actas Urol Esp 2012; 36:228-33. [PMID: 21955561 DOI: 10.1016/j.acuro.2011.07.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Accepted: 07/25/2011] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Obese patients may have special characteristics in the urinary stones formed, as the body mass index (BMI) may also be a predictive factor in lithiasic recurrence. We aim to evaluate and compare the lithiasic characteristics according to the different BMI categories, also considering the likelihood of lithiasic recurrence in presence of age and gender covariables. MATERIAL AND METHODS Retrospective, cross-sectional analysis on 346 lithiasic patients, 96 (27.7%) had low-normal weight, 151 (43.6%) overweight, and 99 (28.6%) obesity. The Chi-square and ANOVA tests were used. Survival analysis for the calculation of likelihood of lithiasic recurrence (yes/no) was made based on time on 158 patients in whom complete resolution of the initial stone was achieved by the Kaplan Meier method. Comparisons between the different categories of BMI were made using the log-Rank, Breslow and Tarone-Ware tests. Multivariate analysis was also made with the Cox regression model, introducing the covariables of age and gender. RESULTS A significant growing linear tendency has been demonstrated between multiplicity and BMI (p=0.03). The variables size and composition did not show significant differences between the groups. Median follow-up of 158 patients included in the survival analysis was 1866 days (95% CI 1602.5-2129.5). Eighteen (11.4%) of them recurred, without finding significant differences between groups: 4 low-normal weight (9.8%), 10 overweight (14.1%) and 4 obese (8.7%). The multivariate analysis also did not show a significant influence of the BMI on lithiasic recurrence (p=0.86; HR =1.06; 95% CI: 0.56-2.03). CONCLUSION A significant influence of BMI was shown on lithiasic multiplicity on diagnosis, although not on lithiasic recurrence based on time. It seems to be necessary to carry out studies in larger samples to calculate the true influence of BMI on lithiasic recurrence.
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Sáenz J, Páez A, Alarcón R, Casas J, Sánchez A, Pereira E, Cáncer E, Álvarez M, Rendón D, Durán M. Obesity as risk factor for lithiasic recurrence. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.acuroe.2012.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Cimaroli K, Páez A, Bruce Newbold K, Heddle NM. Individual and contextual determinants of blood donation frequency with a focus on clinic accessibility: A case study of Toronto, Canada. Health Place 2012; 18:424-33. [DOI: 10.1016/j.healthplace.2011.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Revised: 11/27/2011] [Accepted: 12/19/2011] [Indexed: 11/24/2022]
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Páez A, Ruiz M, López F, Logan J. Measuring Ethnic Clustering and Exposure with the Q statistic: An Exploratory Analysis of Irish, Germans, and Yankees in 1880 Newark. ANNALS OF THE ASSOCIATION OF AMERICAN GEOGRAPHERS. ASSOCIATION OF AMERICAN GEOGRAPHERS 2012; 102:84-102. [PMID: 24855322 DOI: 10.1080/00045608.2011.620502] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
The study of population patterns has animated a large body of urban social research over the years. An important part of this literature is concerned with the identification and measurement of segregation patterns. Recently, emphatic calls have been made to develop measures that are better able to capture the geography of population patterns. The objective of this paper is to demonstrate the application of the Q statistic, developed for the analysis of spatial association of qualitative variables, to the detection of ethnic clustering and exposure patterns. The application is to historical data from 1880 Newark in the United States, with individuals classified by ethnicity and geo-coded by place of residence. Three ethnic groups, termed Irish, Germans, and Yankees are considered. Exploratory analysis with the Q statistic identifies significant differences in the tendency of individuals and building occupancy to cluster by ethnicity. In particular, there is evidence of a strong affinity within ethnic clusters, and some intermingling between Yankee and Irish residents. In contrast, the exposure of Germans to individuals of other groups is found to be more limited.
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Gómez M, Ferrando R, Vilar J, Hitateguy R, López B, Moreira E, Kapitán M, De Lima F, Agüero B, Gabriela Villegas M, Urdaneta N, Gutiérrez E, Battegazzore A, Bayardo K, Silveira A, Lago G, Páez A. [99mTc-OCTREOTIDE in patients with neuroendocrine tumors from the GI tract]. ACTA GASTROENTEROLOGICA LATINOAMERICANA 2010; 40:332-338. [PMID: 21381408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
INTRODUCTION It has been demonstrated that scintigraphy with somatostatin analogues is useful for the diagnosis, staging and follow up of patients with neuroendocrine tumors from the gastrointestinal tract (NET-GIT). Some studies suggest that the use of 99mTc-Hydrazinonicotinyl-Tyr3-octreotide (99mTc-HYNIC-TOC) yields similar diagnostic results than the use of 111In-DTPA-octreotide. OBJECTIVE To determine the clinical value of scintigraphy using 99mTc-HYNIC-TOC for the detection of primary and secondary lesions in patients with NET-GIT. METHODS From September 2004 to May 2009, 32 patients (17 women, age range 18 to 82 years old) with histologically proven or clinically suspected NET-GIT underwent scintigraphy using 99mTc-HYNIC-TOC Patients underwent a whole body scan, with additional static images of abdomen and pelvis, followed by SPECT at 4-hrs post injection of 925 MBq of the tracer. Patients underwent clinical, imaging and histopathology follow-up during 3 to 18 months. RESULTS Histopathology demonstrated carcinoid tumor in 20 patients, insulinoma in 2, gastrinoma in 2 and non-specific NET-GIT in 6. Total sensitivity, specificity, positive predictive value, negative predictive value and accuracy were 87%, 100%, 100%, 89% and 94%, respectively. To detect the primary lesion, the values were 94%, 100% 100%, 94% and 97%, respectively and to detect secondary lesions, 79%, 100%, 100%, 86% and 91%, respectively. CONCLUSIONS 99mTc-HYNIC-TOC is a specific somatostatin analog, with high affinity to receptor subtype SST-2, widely available and affordable by Latin American countries. It has a good performance to be used for diagnosis, staging and follow-up of patients with NET-GIT.
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Boevee S, Venderbos L, Tammela T, Nelen V, Ciatto S, Kwiatkowski M, Páez A, Malavaud B, Hugosson J, Roobol M. Change of tumour characteristics and treatment over time in both arms of the European Randomized study of Screening for Prostate Cancer. Eur J Cancer 2010; 46:3082-9. [DOI: 10.1016/j.ejca.2010.09.033] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 09/19/2010] [Accepted: 09/20/2010] [Indexed: 10/18/2022]
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Mas A, Castells L, Abradelo M, Bernardos Á, Páez A, Woodward M, Sousa J. Evaluation of Anti-HBs Serum Levels and Pharmacokinetic Profile After Intravenous Administration of Niuliva, a New Hepatitis B Immunoglobulin, Following Liver Transplantation. Transplant Proc 2009; 41:4253-8. [DOI: 10.1016/j.transproceed.2009.09.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Accepted: 09/29/2009] [Indexed: 01/26/2023]
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Carrera V, Partal P, García-Morales M, Gallegos C, Páez A. Influence of Bitumen Colloidal Nature on the Design of Isocyanate-Based Bituminous Products with Enhanced Rheological Properties. Ind Eng Chem Res 2009. [DOI: 10.1021/ie9004404] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Páez A, Scott DM, Volz E. A Discrete-Choice Approach to Modeling Social Influence on Individual Decision Making. ACTA ACUST UNITED AC 2008. [DOI: 10.1068/b3320t] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Individual decision making is commonly studied using discrete choice models. Models of this type are applied extensively to the study of travel behavior, residential location, and employment decisions, among other topics of interest. A notable characteristic of the underlying economic theory is the assumption that individuals seek to maximize utility on the basis of their personal attributes and the attributes of the alternatives available to them. This approach ignores the interrelated nature of decision making in social situations—in other words, the role that social structures play in shaping behavior. In this paper we describe a multinomial discrete choice approach to analyzing individual behavior in social situations where position in a social network may encourage or discourage different courses of action. By means of a simulation example, we explore some properties of the model, in particular the effect of network topology.
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