Fig. 1. Evolution of the partial pressure of oxygen/inspired fraction of oxygen (Pao2/Fio2) ratio during the first 24 h in nine patients with life-threatening pulmonary contusion. Initial data with high-frequency jet ventilation (HFJV) were obtained within 1 h after the onset of HFJV. CV = conventional mechanical ventilation; 24 hrs: 24 h after admission, during HFJV.