Abstract

Pneumomediastinum (PM) is defined as the presence of abnormal gas in the mediastinum.It is a known complication of invasive mechanical ventilation and has been reported withnon-invasive ventilation. Recent studies have reported that the incidence of barotrauma islowest in post-operative patients and is highest in mechanically ventilated patients with acuterespiratory distress syndrome. The incidence has dropped with the low tidal volume ventilationtechnique. Chest x-rays can miss up to 25% of small PMs detected by computed tomographyscans of the chest. Pneumomediastinum is managed with low tidal volume ventilation withplateau pressures <30 cm H2O and treatment of the underlying lung disease. Novel ways ofventilation, such as high frequency oscillatory ventilation and asynchronous independent lungventilation, may improve ventilation in some patients.

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