Iatrogenic pneumothorax refers to the pneumothorax generated after diagnostic or therapeutic procedure. We report the case of a 40-year-old male who had bilateral simultaneous iatrogenic pneumothorax with pneumomediastinum leading to cardiac arrest situation, due to wrong placement of nebulization kit in spontaneously breathing intubated patient. We report this case for its rarity, due to the critical importance of this cause as a etiology of bilateral simultaneous iatrogenic pneumothorax leading to cardiac arrest situation, and need to understand the importance of continuous training and stress of emergency environment.