Pneumothorax develops in a patient with ARDS, and a chest tube is placed to reexpand the lung….

Pneumothorax develops in a patient with ARDS, and a chest
tube is placed to reexpand the lung. Before the pneumothorax developed, the
patient was ventilated easily at a rate of 16 breaths/min, which delivered a
tidal volume (VT) of 500 ml, and was exhaling 450 ml (a small difference caused
by endotracheal cuff leak and tubing compliance). Since the pneumothorax
developed, the patient needs a rate of 30 breaths at the same VT to keep the
PaCO2 level the same. Exhaled VT is 300 ml. What is the approximate
size of this patient’s air leak? What ventilation options are appropriate?

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