We present a case of neck trauma in whom initial ventilatory support by bag-valve-mask led to air leakage from an incompletely transected trachea, leading to tension subcutaneous emphysema.

• 这个病例显示一个困难的临床状况：用袋瓣罩来给病人做支持性呼吸，结果造成了因外伤而引起的气管部份破裂发生气体外泄，而引起张力性皮下气肿。