Acute respiratory failure due to exacerbation of chronic pulmonary disease is usually treated with bilevel pressure non invasive ventilation. An high inspiratory pressure is used to improve tidal volume. a lower expiratory pressure is used to neutralize end expiratory positive pressure of patient (PEEPi) caused by flow limitation and airway trapping. When ventilators for bilevel press... https://www.lightemupsequences.com/quick-find-Our-Seasons-The-World-in-Winter-Spring-Summer-and-Autumn-best-save/