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Cancer patients have an increased risk of reactivation of latent tuberculosis infection. It is unknown which strategy on screening should be used in this population in developing countries. We aimed to determine the concordance between the tuberculin skin test (TST) and QuantiFERON®-TB (QFT) assay in order to diagnose latent tuberculosis infection in cancer patients. We conducted a cross-sectional study of the agreement of diagnostic tests. Prevalence and agreement between tests were calculated. A logistic regression to assess predictors of discordance was performed. The accuracy of the TST to predict QFT results by a receiver operating characteristic (ROC) curve was evaluated. We included 149 adults with cancer without active tuberculosis. Prevalence of latent tuberculosis infection was 21.5% (n=32), defined as positive results on either test. Test agreement was moderate for the diagnosis of latent tuberculosis infection (κ=0.43, 90% CI 0.26-0.6). No predictor was associated with the chance of discordant results. Agreement improved slightly using a cut-off point ≥8 mm (κ=0.5, 90% CI 0.35-0.66). In a moderate-incidence setting, a moderate agreement was found between tests in cancer patients. Modification of the cut-off points of test results achieved marginally better agreement between the TST and QFT.

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Abstract Introduction: Even though exacerbations are the main cause of emergency consultation in patients suffering from lung diseases, erythrocyte parameters are not assessed in their prognosis. Thus, determining the implications of erythrocyte parameters might contribute to define the usefulness of phlebotomy or red blood cells transfusion in these patients. Objective: To establish a possible relationship between the different hematocrit levels with a 30-day prognosis in patients admitted with exacerbated chronic lung disease and hypoxemia. Materials and methods: A study based on a 30- day follow-up was conducted. Variables were described using an additional categorization by hematocrit levels and an adjustment in a multivariate model through logistic regression. Results: Follow-up was completed for 110 Patients. The frequency of anemia was 7.3% and of erythrocytosis, 14.5%. A significant association to the outcome using Anthonisen score (OR=10.45, 95%CI: 1.11-98.48, p=0.04), hypertension (OR=11.02, 95%CI: 1.32-91.75, p=0.026) and heart failure (OR=0.09, 95%CI: 0.01-0.82, p=0.032) was found. Conclusion: This research could not determine any relationship between erythrocyte parameters and prognosis of patients suffering from pulmonary diseases; nevertheless, extreme values of hematocrits tended to have adverse outcomes.

Resumen Introducción. Aunque las exacerbaciones de las neumopatías crónicas son las principales causas de consulta a urgencias de los pacientes que las padecen, los parámetros eritrocitarios no son evaluados en su pronóstico. Por tanto, determinar las implicaciones de los parámetros eritrocitarios podría ayudar a definir la utilidad de la flebotomía o la transfusión de eritrocitos en estos pacientes. Objetivo. Establecer si hay relación entre los distintos niveles de hematocrito con pronóstico a 30 días en pacientes con neumopatía crónica exacerbada e hipoxemia. Materiales y métodos. Estudio de seguimiento a 30 días. Se realizó la descripción de las variables con una categorización adicional por niveles de hematocrito y un ajuste en un modelo multivariado por regresión logística. Resultados. Se completó el seguimiento en 110 pacientes. La frecuencia de anemia fue de 7.3% y de eritrocitosis de 14.5%. Se encontró asociación significativa al desenlace con la clasificación Anthonisen (OR=10.45, IC95%: 1.11-98.48; p=0.04), hipertensión arterial (OR=11.02, IC95%: 1.32-91.75; p=0.026) y falla cardiaca (OR=0.09, IC95%: 0.01-0.82; p=0.032). Conclusión. Este estudio no pudo determinar relación alguna entre los parámetros eritrocitarios y el pronóstico de pacientes con enfermedades pulmonares crónicas; sin embargo, hubo una tendencia a que los valores extremos del hematocrito presentaran desenlaces adversos.