Fig. 1From: A novel finding related to bulla and bleb formation in patients with primary spontaneous pneumothoraxIn patient 1, the left lower lobe is inflated, but the upper lobe is not. A total of 50 s were required to inflate the left upper lobe with an airway pressure of 20 cm H2O. In patient 2, the left upper lobe is collapsed despite adequate inflation of the lower lobe. With an airway pressure of 20 cm H2O, the upper lobe underwent gradual inflation.Back to article page