Browsing by Author "Riviotta, Amy"

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    Exogenous Volatile Organic Compound (EVOC®) Breath Testing Maximizes Classification Performance for Subjects with Cirrhosis and Reveals Signs of Portal Hypertension
    (2023) Ferrandino, Giuseppe; Ricciardi, Federico; Murgia, Antonio; Banda, Iris; Manhota, Menisha; Ahmed, Yusuf; Sweeney, Kelly; Nicholson, Louise; McConville, Lucinda; Gandelman, Olga; Allsworth, Max; Boyle, Billy; Smolinska, Agnieszka; Ginesta, Carmen; Contreras, Jorge; Asenjo, Claudia; Barrientos, Viviana; Clavo, Nataly; Novoa, Angela; Riviotta, Amy; Jerez, Melissa; Méndez, Luis
    Background: Cirrhosis detection in primary care relies on low-performing biomarkers. Consequently, up to 75% of subjects with cirrhosis receive their first diagnosis with decompensation when causal treatments are less effective at preserving liver function. We investigated an unprecedented approach to cirrhosis detection based on dynamic breath testing. Methods: We enrolled 29 subjects with cirrhosis (Child-Pugh A and B), and 29 controls. All subjects fasted overnight. Breath samples were taken using Breath Biopsy® before and at different time points after the administration of 100 mg limonene. Absolute limonene breath levels were measured using gas chromatography-mass spectrometry. Results: All subjects showed a >100-fold limonene spike in breath after administration compared to baseline. Limonene breath kinetics showed first-order decay in >90% of the participants, with higher bioavailability in the cirrhosis group. At the Youden index, baseline limonene levels showed classification performance with an area under the roc curve (AUROC) of 0.83 ± 0.012, sensitivity of 0.66 ± 0.09, and specificity of 0.83 ± 0.07. The best performing timepoint post-administration was 60 min, with an AUROC of 0.91, sensitivity of 0.83 ± 0.07, and specificity of 0.9 ± 0.06. In the cirrhosis group, limonene bioavailability showed a correlation with MELD and fibrosis indicators, and was associated with signs of portal hypertension. Conclusions: Dynamic limonene breath testing enhances diagnostic performance for cirrhosis compared to static testing. The correlation with disease severity suggests potential for monitoring therapeutic interventions. Given the non-invasive nature of breath collection, a dynamic limonene breath test could be implemented in primary care.
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    Stroke in Latin America: Systematic review of incidence, prevalence, and case-fatality in 1997–2021
    (2022) Delfino, Carlos; Nuñez, Marilaura; Asenjo, Claudia; González, Francisca; Riviotta, Amy; Urrutia, Francisca; Lavados, Pablo; Anderson, Craig; Muñoz Venturelli, Paula
    Background: Stroke is a major global cause of death and disability. Most strokes occur in populations of low-middle-income country (LMIC); therefore, the subsequent disease burden is greater than in populations of high-income countries. Few epidemiological data exist for stroke in Latin America, composed primarily of LMIC. Aims: To determine epidemiological measures of incidence, prevalence, and 1-month case-fatality for stroke in Latin America/Caribbean (LAC) during 1997-2021. Summary of review: A structured search was conducted to identify relevant references from MEDLINE, WOS, and LILACS databases for prospective observational and cross-sectional studies in LAC populations from January 1997 to December 2021. A total of 9242 records were screened and 12 selected for analysis, seven incidence studies and five prevalence studies. Case-fatality was reported in six articles. Sub-group analysis by age, sex, and income countries was performed. A narrative synthesis of the findings was performed. Meta-analysis was performed using random-effect model to obtain pooled estimates with 95% confidence intervals (CIs). Studies quality was assessed according to the risk of bias criteria described in the Joanna Briggs Institute's guide. The overall crude annual incidence rate of first-ever stroke in LAC was 119.0 (95% CI = 95.9-142.1)/100,000 people (with high heterogeneity between studies (I2 = 98.1%)). The overall crude prevalence was 3060 (95% CI: 95.9-142.1)/100,000 people (with high heterogeneity between studies (I2 = 98.8%)). The overall case-fatality at 1 month after the first stroke was 21.1% (95% CI = 18.6-23.7) (I2 = 49.40%). Conclusion: This review contributes to our understanding regarding the burden caused by stroke in LAC. More studies with comparable designs are needed to generate reliable data and should include both standardized criteria, such as the World Health Organization clinical criteria and updated standard methods of case assurance, data collection, and reporting.

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