Table 2.

Features of PTX in the affected patients.

Case	First PTX onset after NPPV	PTX frequency	Intervention for PTX
Current case—Rajdev et al.	2 months	Three times	Chest tube
Langner et al. [6]	Years	Once	Chest tube
Herrejón Silvestre et al. [8]	Within hours	Once	Chest tube
Mao et al. [20]	NA	Twice	Chest tube
Chicote Álvarez et al. [21]	NA	Once	Chest tube

NA: not available; NPPV: noninvasive positive pressure ventilation; PTX: pneumothorax.