Pneumothorax that develops in intubated patients under volume-controlled ventilation (VCV) is usually associated with increased peak and plateau airway pressures [1-2]. We report the early evolutional changes in the respiratory mechanics of an intubated patient who developed pneumothorax immediately after a bronchoscopic examination while under volume-controlled ventilation. We found that the patient's airway plateau pressure did not increase in the early developing stage of pneumothorax, and that the decay of the plateau pressure was more pronounced. These findings may give us early warning signs of a developing pneumothorax in mechanically-ventilated patients.
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