Cruces P, et al. - Researchers undertook this study to differentiate the components of the working pressure of the respiratory system in infants on mechanical ventilation (MV) with severe bronchiolitis admitted to two PICU’s. Findings demonstrated that the elastic component of the working pressure of the respiratory system was the most important. Furthermore, it was noted that restrictive diseases were characterized by the elastic and resistive components in conjunction with the flow profile. In this group of patients, a better understanding of lung mechanics may lead to change the traditional ventilatory approach to severe bronchiolitis.