BMI and waist circumference in adulthood make a greater impact on lung function in adulthood than anthropometric measurements at birth and infancy. Proxy measures of fatness in adulthood reduce lung function, but the pattern between fatness and lung function by sex may be different.

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Assessment of disease control among asthmatic adolescents Background: The clinical assessment of asthma control is fundamental to evaluate the results of treatment. The Asthma Control Test (ACT) is a questionnaire with five scored items, that differentiates between a well controlled or uncontrolled asthma. It has a Spanish version and has been applied in different countries. Aim: To assess asthma control using the ACT and compare it with the clinical assessment of specialists in a group of pediatric patients. Material and methods: The ACT was applied to 220 adolescents aged 12 to 17 years, 54% males, with persistent asthma, attended at a respiratory disease unit of a pediatric hospital. The concordance between ACT results and the assessment of specialists was also evaluated. Results: According to ACT and specialists, asthma was controlled in 54% and 63% of patients, respectively. There was a weak concordance between ACT and specialists assessment (Kappa Index: 0.27; 95% confidence intervals: 0.14-0.4). The degree of asthma control decreased along with increasing severity of the disease (χ 2 = 10.128, p =0.001). Conclusions: Half of the evaluated asthmatic adolescents do not have an adequate control of their disease. Severity of the disease is inversely related to the degree of control (

Introduction: Since 2007, there are international guidelines for implementation and interpretation of spirometry in preschool children. A percentage of these patients cannot obtain maneuvers that meet all eligibility criteria. The objective of this study was to develop a quality scale for interpreting these partially acceptable spirometry. Material and Method: Delphi methodology was used, which allows to reach consensus among experts analyzing a defined problem. We invited to participate pediatric pneumologists dedicated to lung function and who participated actively in scientific specialty societies in Chile. Successive rounds were conducted with questionnaires about criteria used to assess spirometry in preschool children. These criteria define the acceptability of spirometric maneuvers according to international guidelines. Proposed quality grades were "very good'', "good'', "fair'' and "bad''. Results: Thirteen of the 15 invited experts accepted our invitation. In the first round 9 disagreed with the degree of ``regular'' quality. In the second round this was removed and 11 experts answered, 9 of them agreed with the use of this new version. The most contentious criterion was the end of expiration. Conclusion: Most experts agreed with the final scale, using "very good'', "good'' and "bad'' judgments. This would help to improve the performance of spirometry in children between 2 and 5 years.

La espirometría es la prueba de función pulmonar más adecuada para evaluar a preescolares con enfermedades pulmonares crónicas y sibilancias recurrentes. Es útil, accesible y de buen rendimiento. Para una correcta interpretación debe realizarse bajo las condiciones especialmente normadas para este grupo etario. En esta revisión, producto del trabajo realizado durante el año 2018, por la comisión de función pulmonar de la sociedad Chilena de Neumología Pediátrica, se expondrán los aspectos actualizados para la realización e interpretación de la espirometría en preescolares, con énfasis en las diferencias de los criterios clásicamente descritos para niños mayores y adultos.

La prueba de provocación bronquial con ejercicio tiene como objetivo demostrar la presencia de hiperreactividad bronquial inducida por ejercicio, característica del asma bronquial. Su realización está bien estandarizada, requiriendo de condiciones ambientales especiales, preparación y esfuerzo submáximo del paciente. La respuesta se mide mediante espirometría, y se considera una prueba de provocación con ejercicio positivo, a una caída del volumen espirado al primer segundo (VEF1) del 10%. En este artículo se describen los elementos necesarios para facilitar la realización de este examen, acorde a normas y guías nacionales e internacionales.

La espirometría es el examen más comúnmente utilizado para evaluar la función pulmonar en niños y adultos. Para obtener resultados de buena calidad deben cumplirse varios requisitos, desde la capacidad profesional del técnico, calidad de los equipos, colaboración del paciente y utilización de patrones de referencia adecuados. La espirometría tiene como utilidad definir alteraciones ventilatorias obstructivas de vía aérea central y periférica, evaluar respuesta a broncodilatador y orientar al diagnóstico de enfermedades restrictivas.Se describen los nuevos consensos de expertos nacionales e internacionales, los cuales han ido perfeccionando varios aspectos de este examen.