Table 3.

Evaluation of risks related to pneumothorax in the 5 patients.

	Patient 1	Patient 2	Patient 3	Patient 4	Patient 5
Increased alveolar pressure	Possible	Probable	Irrelevant	Possible	Possible
Increased negative pressure of pleural cavity*	Probable	Possible	Probable	Probable	Probable
Alveolar shear stress	Probable	Probable	Probable	Probable	Probable
Changes of lung structure and function	Probable	Probable	Probable	Probable	Probable

^⁎severe cough, forced inhaled or paradoxical thoracoabdominal motion