We have analyzed the patients who were admitted to ICU for postoperative care for over 36 hours and/or respiratory problems from July, 1981 to June 1982. 1) The total number of patients was 339, 198(57%) male and 146(43%) female. The mortality rate was 43.7% 2) Overall morality rate of patients in ICU was 49.7% and the 5th decade had the highest mortality rate. 3) The number of the patients who needed respiratory support was 217. 4) The number and type of airways were: orotracheal(174 cases, 96.4%), nasotracheal(9 cases, 4.1%) and trachestomy(34cases, 9.4%). 5) In the course of ventilator support, 72 patients (33.2%) among 217 could be weaned away from the ventilator. 6) The Mortality rate of ventilator supported patients was 59.9%(130). The mortality rate according to the type of the ventilator used was as follows: in Bird 73.2%, in Bourns 71.4% and in Servo 34.2%.