A man ws injured in an automobile accident resulting rib fracture.He became unconscious,dyspnea and cynosis.PaO2 20mmHg,PaCO2 68mmHg,PH 7.25.After treatment,T 39,PaCO2 28mmHg,PH 7.56.Blood culture revealed bacteria.
Point out he type,cause and mechanism of pathologic process happened in the patient before and after treatment.