Publications by authors named "Omar Yaxmehen Bello-Chavolla"

Objective: Older adults have heterogeneous aging rates. Here, we explored the impact of biological age (BA) and accelerated aging on frailty in community-dwelling older adults.

Methods: We assessed 735 community-dwelling older adults from the Coyocan Cohort.

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Objective: Evidence from low- and middle-income countries regarding the effect of smoking in people with diabetes is lacking. Here, we report the association of smoking with mortality in a large cohort of Mexican adults with diabetes.

Methods: Participants with diabetes mellitus (self-reported diagnosis, use of antidiabetic medications or HbA1c ≥ 6.

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Objective: To validate AnthropoAge, a new metric of biological age (BA), for prediction of all-cause mortality and age-related outcomes and characterize population-specific aging patterns using multinational longitudinal cohorts.

Methods: We analyzed harmonized multinational data from the Gateway to Global Aging, including studies from the US, England, Mexico, Costa Rica, and China. We used body mass index and waist-to-height ratio to estimate AnthropoAge and AnthropoAgeAccel in participants aged 50-90 years old as proxies of BA and age acceleration, respectively.

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Background: US-based Latinos have lower education and income combined with higher health risks than non-Latino whites, but often 'paradoxically' evidence better health-related outcomes. Less work has investigated this paradox for cognitive-related outcomes despite nativity diversity.

Objective: We evaluated cognitive aging within older Latinos of diverse nativity currently living in the US and participating in Rush Alzheimer's Disease Center studies.

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Background: Prediabetes has been associated with increased all-cause and cardiovascular mortality. However, no large-scale studies have been conducted in Mexico or Latin America examining these associations.

Methods: We analyzed data from 115,919 adults without diabetes (diagnosed or undiagnosed) aged 35-84 years who participated in the Mexico City Prospective Study between 1998 and 2004.

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Article Synopsis
  • The study estimates the prevalence of four diabetes subgroups in Mexico using data from national health surveys conducted between 2016 and 2022, focusing on over 23,000 adults.
  • The overall diabetes prevalence was found to be 16.04%, with specific subgroup prevalence rates highlighting that severe insulin-deficient diabetes (SIDD) and obesity-related diabetes (MOD) are more common in Southern Mexico, while age-related (MARD) and severe insulin-resistant diabetes (SIRD) are prevalent in Northern Mexico and Mexico City.
  • Factors such as social disadvantage and speaking an indigenous language were associated with increased odds for SIDD, indicating regional and sociodemographic disparities that could impact diabetes management in Mexico.
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Background And Aims: Remnant cholesterol (RC) and insulin resistance (IR) have been independently associated with cardiovascular risk. Here, we evaluated the role of IR and RC on cardiovascular disease (CVD) mortality.

Methods: We conducted an analysis of 16,113 individuals ≥20 years without diabetes from the National Health and Nutrition Examination Survey (NHANES-III/IV).

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More than 8 million older people in Latin America depend on long-term care (LTC), accounting for 12% of people aged ≥ 60 years and almost 27% of those aged ≥ 80. It is crucial to develop sustainable strategies for providing LTC in the area, including institutional care. This special report aims to characterize institutional LTC in four countries (Brazil, Chile, Costa Rica and Mexico), using available information systems, and to identify the strategies adopted to support institutional care in these countries.

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Article Synopsis
  • Post-acute sequelae after SARS-CoV-2 infection (PASC) affects 12.44% of adults in Mexico, with fatigue and pain being the most reported symptoms.
  • Analysis of 24,434 participants from the 2022 Mexican National Health and Nutrition Survey revealed higher PASC prevalence linked to reinfections, depressive symptoms, and lower social status.
  • Vaccination and infections during the Omicron variant surge correlated with a reduction in severe PASC cases, emphasizing the need for preventive measures and booster vaccinations.
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Objectives: To examine the association of current and childhood socioeconomic status (SES) with patient-reported functional status, quality of life and disability in patients with knee or hip osteoarthritis (OA).

Methods: Cross-sectional study amongst individuals seeking care for any medical reason in a primary care family-practice clinic in Mexico City. We included individuals with self-reported doctor-diagnosed arthritis, recruited through waiting-room posters and invitations by treating family physicians.

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Article Synopsis
  • A study analyzed prediabetes prevalence trends in Mexico from 2016 to 2022 using different definitions (ADA, WHO, IEC) after excluding known diabetes cases.
  • The overall prevalence of prediabetes in 2022 was 20.9%, showing a downward trend for certain definitions, while HbA1c-based definitions indicated an increase, especially among adults over 40 and those with other risk factors.
  • The findings suggest that, despite some decreases in certain prediabetes criteria, there is still a rising concern related to cardiometabolic conditions linked to prediabetes in Mexico.
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Background: Social inequalities in adult mortality have been reported across diverse populations, but there is no large-scale prospective evidence from Mexico. We aimed to quantify social, including educational, inequalities in mortality among adults in Mexico City.

Methods: The Mexico City Prospective Study recruited 150 000 adults aged 35 years and older from two districts of Mexico City between 1998 and 2004.

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Finasteride and dutasteride are 5-alpha reductase selective inhibitors (5ARIs). They were introduced as therapeutic agents for the treatment of benign prostatic hyperplasia in 1992 and 2002, respectively; finasteride has also been approved for the treatment of androgenetic alopecia since early 2000. These agents inhibit the conversion of testosterone (T) to 5α-dihydrotestosterone (5α-DHT), limiting steroidogenesis and playing a crucial role in the physiological function of the neuroendocrine system.

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Background: With the widespread transmission of the Omicron SARS-CoV-2 variant, reinfections have become increasingly common. Here, we explored the role of immunity, primary infection severity, and variant predominance in the risk of reinfection and severe COVID-19 during Omicron predominance in Mexico.

Methods: We analyzed reinfections in Mexico in individuals with a primary infection separated by at least 90 days from reinfection using a national surveillance registry of SARS-CoV-2 cases from March 3rd, 2020, to August 13th, 2022.

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Objectives: Vaccination has been effective in ameliorating the impact of COVID-19. Here, we report vaccine effectiveness (VE) of the nationally available COVID-19 vaccines in Mexico.

Methods: Retrospective analysis of a COVID-19 surveillance system to assess the VE of the BNT162b2, messenger RNA (mRNA)-12732, Gam-COVID-Vac, Ad5-nCoV, Ad26.

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Aging is believed to occur across multiple domains, one of which is body composition; however, attempts to integrate it into biological age (BA) have been limited. Here, we consider the sex-dependent role of anthropometry for the prediction of 10-year all-cause mortality using data from 18,794 NHANES participants to generate and validate a new BA metric. Our data-driven approach pointed to sex-specific contributors for BA estimation: WHtR, arm and thigh circumferences for men; weight, WHtR, thigh circumference, subscapular and triceps skinfolds for women.

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Objective: To provide the largest single-center analysis of islet (ITx) and pancreas (PTx) transplantation.

Summary Background Data: Studies describing long-term outcomes with ITx and PTx are scarce.

Methods: We included adults undergoing ITx (n=266) and PTx (n=146) at the University of Alberta from January 1999 to October 2019.

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Article Synopsis
  • The study aimed to assess diabetes-related mortality in Mexico during 2020 compared to the years 2017-2019, looking specifically at the impact of the COVID-19 pandemic.
  • Researchers analyzed national death registries, focusing on Mexican adults aged 20 and older, and found a significant increase in diabetes-related deaths in 2020, totaling 148,437 compared to an average of 101,496 in the previous three years.
  • The findings highlighted a 41.6% rise in diabetes-related mortality in 2020, with most deaths occurring outside hospitals, heavily impacting individuals with type 2 diabetes and related complications, particularly in southern Mexico where social factors and COVID-19 rates were higher.
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Background: In 2020, Mexico experienced one of the highest rates of excess mortality globally. However, the extent of non-COVID deaths on excess mortality, its regional distribution and the association between socio-demographic inequalities have not been characterized.

Methods: We conducted a retrospective municipal and individual-level study using 1 069 174 death certificates to analyse COVID-19 and non-COVID-19 deaths classified by ICD-10 codes.

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Article Synopsis
  • * The study found 97 cases of GBS with an overall incidence of 1.19 per million doses, noting higher risks associated with specific vaccines like Ad26.COV2-S and BNT162b2.
  • * Despite the low incidence, GBS onset typically occurred about 10 days post-vaccination, with a notable proportion of patients requiring significant medical intervention and experiencing severe disability outcomes.
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Objective: To externally validate various prognostic models and scoring rules for predicting short term mortality in patients admitted to hospital for covid-19.

Design: Two stage individual participant data meta-analysis.

Setting: Secondary and tertiary care.

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Inflammatory processes associated with human parturition are still not completely understood, not only because the gap between inflammation and the onset of labor has been difficult to study but also because of the limited knowledge about the role of cervicovaginal fluid (CVF) cytokines during the sequence of labor. We aimed to determine whether CVF cytokines could predict the onset of normal and preterm labor. Chemokines and proinflammatory and anti-inflammatory cytokines in CVF were measured in a pseudo-longitudinal manner in healthy women between 12 and 41 weeks gestation with intact fetal membranes before and during the first stage of labor.

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Objective: To describe differences in Case Fatality Rate (CFR) for Covid-19 among healthcare subsystems in Mexico City between March and December 2020.

Materials And Methods: This is a retrospective secondary data analysis from the National Epidemiological Surveillance System data of Covid-19 cases. Information about health provider institutions was retrieved from the Catalogue of Health Establishments (CLUES).

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