Prevention of Arterial Oxygen Desaturation during Endotracheal Suction / 대한마취과학회지

The purpose of this study was to determine the frequency and severity of arterial oxygen desaturation during and after endotracheal suctioning in a group of ventilator-dependent patients and to evaluate the efficacy of several maneuvers designed to minimize desaturation. All patients were ventilated with volume-typed ventilator and a synchronized intermittent mandatory ventilation(SIMV) mode was utilized. In a given patint, each study consisted of four seperate passes of the suction catheter. The oxygen status of the patient was monitored with a digital pulse oxymeter. The mean baseline SaO2 for the group with each suctioning technique was very similar and did not differ significantly. When patints were suctioned off the ventilator without extra breaths, a significant drop occurred in the mean SaO2 And when the patients were suctioned with prebreaths and postbreaths off the ventilator or were maintained on the ventilator and suctioned through the swivel adaptor, there was a significant desaturation with all three methods. However, the mean desaturation of 0.8 percent with the swivel adaptor was significantly less(p<0.05) than the mean desaturation with any of the other three methods.

A Clinical Study on Arterial Oxygen Saturation in the Early Period of Anesthetic Recovery from General Endotracheal Anesthesia / 대한마취과학회지

To investigate the incidence of hypoxemia which was defined as arterial blood oxygen saturation (SaO2) of 90% or less following general endotracheal anesthesia, 112 adult patients were randomly allocated to one of 8 groups aceording to oxygen administration or not. SaO2 was continually measured during postanesthetic period using a pulse oximeter (Nellcor, N-100 C, USA). The incidence of hypoxemia was lower in oxygen administration groups (5%) than in no administration groups (14%) in the recovery room. The mean discharge time of oxygen administration groups in the recovery room (37.9 min) was significantly shorter than that of no administration groups (45.6 min) (P=0.003). There were two cases of hypoxemia during transfer of patients from the operating room to the recovery room. The incidence of hypoxemia in oxygen administration groups (9%) was lower than no oxygen administration groups (71%) during 5 minutes after endotracheal extubation. It was coneluded that the incidence of hypoxemia can be reduced by administrating oxygen during postanesthetic period. Therefore, it is recommended that oxygen should be administered to all postoperative patients for prevention of hypoxemia following general endotracheal anesthesia.