Results. At first the pressure of oxygen in arterial blood increased; however, this increase in the open technique was greater than that of the closed system . The pressure of oxygen decreased five and fifteen minutes after both suctioning techniques . The trends of carbon dioxide variations after the open and closed techniques were upward and downward, respectively. Moreover, the decrease in the level of oxygen saturation five and fifteen minutes after the open suctioning was greater than that of the closed suctioning technique .