[Bilateral pneumothorax of an amyotrophic lateral sclerosis patient under mechanical ventilation].

Amyotrophic lateral sclerosis (ALS) is a progressive and fatal disease. To support breathing of some patients with ALS in its severe condition, mechanical ventilation is indispensable. However, mechanical ventilation has been known to induce pneumothorax by the damage of lung cells in response to mechanical stretch. An ALS 50-year-old male on mechanical ventilation was referred to our department for left pneumothorax. After an unsuccessful drainage for a couple of weeks, he underwent a partial resection of the left lung. On 3rd postoperative day (POD) the left lung collapsed again. Moreover, on 6th POD, the right pneumothorax occurred. Regarding the right pneumothorax, drainage was effective with a continuous pressure of -10 cm H2O, and the chest tube was removed soon. An air leak from the left chest tube persisted, and the left lung expansion was not enough with its apex line around the clavicle. On 42nd POD, a drainage pressure was increased up to -15 cm H2O. Then an air leak disappeared, and the lung expansion was obtained. The adjustment of a chest tube drainage pressure seems to be important, especially when a pneumothorax patient on mechanical ventilation is treated.