 An open pneumothorax is similar to a pneumothorax, except that there is also a wound in the skin. Now there is a communication between the pleural space to the outside. When the patient inhales, the ear preferentially enters through the hole in the chest and not through the trachea. This can potentially cause a tension pneumothorax. The treatment for open pneumothorax is a three-sided, occlusive dressing. This dressing should be non-porous and only three edges are taped down, leaving one edge open. When the patient inhales, the dressing is pulled closer to the skin, sealing the open wound. When the patient exhales, the ear releases from the wound through the untapped edge. This is temporary. Patient should also receive a chest tube afterwards.