Browsing by Author "Paredes, Fabio"

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    Association of abo blood groups with gestational diabetes mellitus
    (SOC MEDICA SANTIAGO, 2017) Huidobro M, Andrea; Torres C, Demetrio; Paredes, Fabio
    Background: ABO and Rhesus blood systems are associated with type 2 Diabetes Mellitus (DM2). Gestational Diabetes (GDM) is a model to study DM. Aim: To study the association between GDM and ABO and Rhesus groups. Material and Methods: A retrospective cohort study was performed in 1,078 women who gave birth to a singleton in Talca Regional Hospital, Chile, during 2008. We analyzed personal, obstetric, medical data and ABO and Rh blood groups. Results: GDM was diagnosed in 6.6% of women. Age and body mass index were significantly associated with GDM. There were no differences in Rh blood groups (p = 0.604), while ABO groups were different between GDM and controls. B antigen was present in 3% of GDM women and in 10.8% of controls (p = 0.037), with an odds ratio of 0.25 after adjusting for other associated risk factors (p = 0.06). Conclusions: ABO group is suggested as a possible protector marker for GDM.
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    Differential neutralizing antibody responses elicited by CoronaVac and BNT162b2 against SARS-CoV-2 Lambda in Chile
    (2022) Acevedo, Monica L.; Gaete-Argel, Aracelly; Alonso-Palomares, Luis; de Oca, Marco Montes; Bustamante, Andres; Gaggero, Aldo; Paredes, Fabio; Cortes, Claudia P.; Pantano, Sergio; Martinez-Valdebenito, Constanza; Angulo, Jenniffer; Le Corre, Nicole; Ferres, Marcela; Navarrete, Marcelo A.; Valiente-Echeverria, Fernando; Soto-Rifo, Ricardo
    The SARS-CoV-2 Lambda variant has been prevalent in Latin America. An analysis of the neutralization capacity of antibodies elicited by CoronaVac and BNT162b2 against SARS-CoV-2 Lambda in plasma from healthcare workers and patients in Chile reveals that BNT162b2 elicits higher neutralizing antibody titres than CoronaVac.
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    Effectiveness of an inactivated SARS-CoV-2 vaccine in children and adolescents: a large-scale observational study
    (ELSEVIER, 2023) Jara, Alejandro; Undurraga, Eduardo A.; Flores, Juan Carlos; Zubizarreta, Jose R.; Gonzalez, Cecilia; Pizarro, Alejandra; Ortuno-Borroto, Duniel; Acevedo, Johanna; Leo, Katherinne; Paredes, Fabio; Bralic, Tomas; Vergara, Veronica; Leon, Francisco; Parot, Ignacio; Leighton, Paulina; Suarez, Pamela; Rios, Juan Carlos; Garcia-Escorza, Heriberto; Araos, Rafael
    Background Policymakers urgently need evidence to adequately balance the costs and benefits of mass vaccination against COVID-19 across all age groups, including children and adolescents. In this study, we aim to assess the effectiveness of CoronaVac's primary series among children and adolescents in Chile. Methods We used a large prospective national cohort of about two million children and adolescents 6-16 years to estimate the effectiveness of an inactivated SARS-CoV-2 vaccine (CoronaVac) in preventing laboratory-confirmed symptomatic SARS-CoV-2 infection (COVID-19), hospitalisation, and admission to an intensive care unit (ICU) associated with COVID-19. We compared the risk of individuals treated with a complete primary immunization schedule (two doses, 28 days apart) with the risk of unvaccinated individuals during the follow-up period. The study was conducted in Chile from June 27, 2021, to January 12, 2022, when the SARS-CoV-2 Delta variant was predominant but other variants of concern were co-circulating, including Omicron. We used inverse probability-weighted survival regression models to estimate hazard ratios of complete immunization over the unvaccinated status, accounting for time-varying vaccination exposure and adjusting for relevant demographic, socioeconomic, and clinical confounders.Findings The estimated adjusted vaccine effectiveness for the inactivated SARS-CoV-2 vaccine in children aged 6-16 years was 74.5% (95% CI, 73.8-75.2), 91.0% (95% CI, 87.8-93.4), 93.8% (95% CI, 87.8-93.4) for the prevention of COVID-19, hospitalisation, and ICU admission, respectively. For the subgroup of children 6-11 years, the vaccine effectiveness was 75.8% (95% CI, 74.7-76.8) for the prevention of COVID-19 and 77.9% (95% CI, 61.5-87.3) for the prevention of hospitalisation.Interpretation Our results suggest that a complete primary immunization schedule with the inactivated SARS-CoV-2 vaccine provides effective protection against severe COVID-19 disease for children 6-16 years.Copyright & COPY; 2023 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
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    Effectiveness of an Inactivated SARS-CoV-2 Vaccine in Chile
    (MASSACHUSETTS MEDICAL SOC, 2021) Jara, Alejandro; Undurraga, Eduardo A.; Gonzalez, Cecilia; Paredes, Fabio; Fontecilla, Tomas; Jara, Gonzalo; Pizarro, Alejandra; Acevedo, Johanna; Leo, Katherine; Leon, Francisco; Sans, Carlos; Leighton, Paulina; Suarez, Pamela; Garcia Escorza, Heriberto; Araos, Rafael
    Inactivated SARS-CoV-2 Vaccine in Chile In a national prospective cohort study involving 10.2 million participants in Chile, the effectiveness of an inactivated SARS-CoV-2 vaccine, which had been developed in China and administered in two doses 28 days apart, was estimated. Effectiveness among fully immunized persons was estimated at 65.9% for Covid-19 and at 87.5% for hospitalization, 90.3% for ICU admission, and 86.3% for death.
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    Metal Exposure in Arica, Chile: Examining Toxic Elements
    (2023) Medel-Jara, Patricio; Gejman, Catherine; Chavez, Beatriz; Saavedra, Marta; Paredes, Fabio; Valenzuela, Andres; Rebolledo, Daniel; Rios, Juan Carlos
    Background: Bioaccumulation of toxic metals in the population is associated with adverse health effects. Although some elements are essential for humans, high levels of exposure can be dangerous. Objective: To describe the levels of Inorganic Arsenic (AsIn), Cadmium (Cd), Chromium (Cr), and Mercury (Hg) in urine, and Lead (Pb) in blood in the population of Arica, Chile. Methodology: Descriptive study. Beneficiaries of the Health Surveillance Program of Law 20.590 in sites of higher risk of exposure in the commune of Arica were considered eligible. The results of biological samples to measure their concentrations of AsIn, Cd, Cr, Hg in urine, and Pb in blood between August 2016 and May 2021 are described. Results: 9520 samples from a population with a mean age of 40.5 years were studied. 4.21% of the adult population and 6.57% of the children had AsIn values above 35 mu g/L, while at least 95 % of the total samples had levels below 33 mu g/L. At least 90 % of the samples had Cd levels below 1.1 mu g/L, and 8.44 % had Cd levels above 2 mu g/L, higher in males (11.67%). There were no values above the reference in children. 99.77% and 99.33% had Cr and Pb values below the reference limit, respectively (using the lowest reference range established by Chile Ministry of Health (MINSAL) < 5 mu g/L). Children did not present risk values for Cr, and 0.16% presented Pb concentrations between 5-10 mu g/dL. All samples presented Hg concentrations below risk levels (< 10 mu g/L). Conclusions: The results of this study suggest that a small percentage of the samples analyzed in the beneficiary population of Arica register metal concentration levels above national reference levels established by MINSAL, mainly AsIn, Cd, and Pb. It is essential to continue biomonitoring to reduce and prevent exposure to these metals, which can have harmful effects on human health.
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    Nonpharmacological interventions to promote sleep in the adult critical patients unit: a scoping review
    (Elsevier Ireland Ltd, 2025) Carrera Fabia, María Paz; Alegría Vargas, Leyla; Brockmann Veloso, Pablo Edmundo; Repetto Lisboa, Paula Beatriz; Leonard, Douglas; Cádiz, Rodrigo; Paredes, Fabio; Rojas Gualy, Idalid; Moya Digmann, Ana Verónica; Oviedo Alvarez, Vanessa Andrea; García, Patricio; Henríquez-Beltrán, Mario; Bakker, Jan
    Background: Sleep and circadian rhythms are markedly altered in intensive care unit (ICU) patients. Numerous factors related to the patient and the ICU environment affect the ability to initiate and maintain sleep. Therefore, nonpharmacological interventions could play an essential role in improving sleep and circadian rhythm. Objective: The aim of this study was to examine nonpharmacological interventions evaluated for promoting sleep in adult ICUs. Methods: A scoping review was conducted, including randomised controlled trials, nonrandomised controlled trials, quasi-experimental trials, and other controlled studies investigating the effects of nonpharmacological interventions promoting sleep in adult ICU patients. Results: A total of 57 articles and 14 ongoing trials were included in the review, of which 38 were randomised clinical trials. Nine nonpharmacological interventions to improve sleep in critically ill patients were evaluated: earplugs and/or eye masks, aromatherapy, bundles, music intervention, massage or acupressure, noise masking, bright light, and dynamic light. Most included trials simultaneously assessed the effect of more than one intervention on perceived sleep quality using questionnaires. The association between the interventions and improved sleep varied. In the case of multicomponent interventions, it is difficult to identify which components might have influenced sleep improvement. Conclusions: Numerous studies have evaluated various nonpharmacological interventions to promote sleep in critically ill patients, several of which improved perceived sleep quality. However, the substantial variability of the assessed interventions and their implementation complicates drawing reliable conclusions. Registration: The protocol for this scoping review was registered with the Open Science Framework under the identifier https://doi.org/10.17605/OSF.IO/MPEQ5.
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    Performance of SARS-CoV-2 rapid antigen test compared with real-time RT-PCR in asymptomatic individuals
    (2021) Pena, Monica; Ampuero, Manuel; Garces, Carlos; Gaggero, Aldo; Garcia, Patricia; Soledad Velasquez, Maria; Luza, Ricardo; Alvarez, Pia; Paredes, Fabio; Acevedo, Johanna; Farfan, Mauricio J.; Solari, Sandra; Soto-Rifo, Ricardo; Valiente-Echeverria, Fernando
    Screening, testing and contact tracing plays a pivotal role in control of the COVID-19 pandemic. To enable this it is necessary to increase the testing capacity. This study compared a SARS-CoV-2 rapid antigen test (RAT) and RT-PCR in 842 asymptomatic individuals from Tarapaca, Chile. A sensitivity of 69.86%, specificity of 99.61%, PPV of 94.44% and NPP of 97.22% with Ct values (Ct > 27) that were significantly higher among individuals with false-negative RAT were reported. These results support the fact that RAT might have a significant impact on the identification of asymptomatic carriers in areas that lack suitable laboratories to perform SARS-CoV-2 real-time RT-PCR diagnostics, or the results take more than 24-48 h, as well as zones with high traffic of individuals such as border/customs, airports, interregional bus, train stations or in any mass testing campaign requiring rapid results.
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    The Association between Fasting Glucose and Sugar Sweetened Beverages Intake Is Greater in Latin Americans with a High Polygenic Risk Score for Type 2 Diabetes Mellitus
    (2022) Lopez-Portillo, Maria Lourdes; Huidobro, Andrea; Tobar-Calfucoy, Eduardo; Yanez, Cristian; Retamales-Ortega, Rocio; Garrido-Tapia, Macarena; Acevedo, Johanna; Paredes, Fabio; Cid-Ossandon, Vicente; Ferreccio, Catterina; Verdugo, Ricardo A.
    Chile is one of the largest consumers of sugar-sweetened beverages (SSB) world-wide. However, it is unknown whether the effects from this highly industrialized food will mimic those reported in industrialized countries or whether they will be modified by local lifestyle or population genetics. Our goal is to evaluate the interaction effect between SSB intake and T2D susceptibility on fasting glucose. We calculated a weighted genetic risk score (GRSw) based on 16 T2D risk SNPs in 2828 non-diabetic participants of the MAUCO cohort. SSB intake was categorized in four levels using a food frequency questionnaire. Log-fasting glucose was regressed on SSB and GRSw tertiles while accounting for socio-demography, lifestyle, obesity, and Amerindian ancestry. Fasting glucose increased systematically per unit of GRSw (beta = 0.02 +/- 0.006, p = 0.00002) and by SSB intake (beta[cat4] = 0.04 +/- 0.01, p = 0.0001), showing a significant interaction, where the strongest effect was observed in the highest GRSw-tertile and in the highest SSB consumption category (beta = 0.05 +/- 0.02, p = 0.02). SNP-wise, SSB interacted with additive effects of rs7903146 (TCF7L2) (beta = 0.05 +/- 0.01, p = 0.002) and with the G/G genotype of rs10830963 (MTNRB1B) (beta = 0.19 +/- 0.05, p = 0.001). Conclusions: The association between SSB intake and fasting glucose in the Chilean population without diabetes is modified by T2D genetic susceptibility.
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    The Chile Biliary Longitudinal Study: A Gallstone Cohort
    (2021) Koshiol, Jill; Van de Wyngard, Vanessa; McGee, Emma E.; Cook, Paz; Pfeiffer, Ruth M.; Mardones, Noldy; Medina, Karie; Olivo, Vanessa; Pettit, Karen; Jackson, Sarah S.; Paredes, Fabio; Sanchez, Raul; Huidobro, Andrea; Villaseca, Miguel; Bellolio, Enrique; Losada, Hector; Carlos Roa, Juan; Hildesheim, Allan; Carlos Araya, Juan; Ferreccio, Catterina
    Gallbladder cancer (GBC) is a highly fatal cancer that can be cured through cholecystectomy if identified early. The presence of gallstones is the primary risk factor for GBC, but few people with gallstones develop GBC. A key question is what drives the development of GBC among persons with gallstones. We initiated the Chile Biliary Longitudinal Study (Chile BiLS) to address this question. From 2016 to 2019, Chile BiLS enrolled 4,726 women aged 50-74 years with ultrasound-detected gallstones from southern-central Chile, accounting for an estimated 36% of eligible women with gallstones in the study area. The median age was 59 years; 25% of the women were Amerindian (Mapuche), 60% were obese, 25% had diabetes, and 6% had cardiovascular disease. Participants will be followed for gallbladder dysplasia or cancer for 6 years. As of April 30, 2020, over 91% of those eligible completed the year 2 follow-up visit. Data being collected include epidemiologic and sociodemographic information, anthropometric measurements, blood pressure, and tooth counts. Biosamples being taken include baseline plasma, buffy coat, red blood cells, serum, blood clot from serum, and PAXgene whole blood (PreAnalytiX GmbH, Hombrechtikon, Switzerland). Complete gallbladder sampling is conducted for most participants undergoing cholecystectomy. The Chile BiLS cohort study will increase our understanding of GBC etiology and could identify potential risk stratification and early detection strategies in high-risk areas.
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    Tooth loss and depression in Chilean participants of the National Health Survey 2016-2017: Oral and social functions mediation analysis
    (2024) Ortuno, Duniel; Martinez, Constanza; Caneo, Constanza; Paredes, Fabio; Soto, Mario; Gonzalez, Maria Ines; Vargas, Juan Pablo; Koller, Garrit
    Background: Previous studies have indicated the association between poor oral health and depression in adults. This study evaluated oral and social functions contribution to the association between tooth loss and depressive symptoms in Chilean individuals. Methods: We used data from the Chilean National Health Survey. The number of remaining teeth (<= 19 versus >= 20 teeth) and anterior tooth losses were the exposure variables. Outcome was depression, measured through a self-report question and with the Composite International Diagnostic Interview - Short Form (CIDI SF). Mediating variables were determined by five questions, including problems regarding "speaking", "pain and suffering", "eating", "daily activities", and "social relationships". We performed logistic regression models adjusted by multiple confounders variables. Finally, we calculated indirect, direct effect, total effect, and the proportion mediated (PM). Results: We included 5383 participants. The self-reported depression and suspected depression prevalence were 22,1 % and 14,0 % respectively. The total effect of fewer remaining teeth (<= 19) on self-reported depression was 1.21 (95 % CI 1.02-1.44), and 1.09 (95 % CI 0.90-1.33) for suspected depression. All five variables of oral and social functions significantly mediated the association between tooth loss and depression. Feeling uncomfortable when speaking or eating discomfort were the most significant mediators. Limitations: The mediation analysis should be interpreted with caution due to the cross-sectional design. Conclusions: Deterioration of oral and social functions was a significant mediator in the association between tooth loss and depression, in particular feeling uncomfortable when speaking or eating. This mechanism should be considered in interventions to improve mental health.