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KMID : 0356019950100020089
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Koean Jounral of Critical Care Medicine
1995 Volume.10 No. 2 p.89 ~ p.95
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Comparative Effects on Endotracheal Suction between N2O-O2 and Only O2 Inhalation during General Anesthesia with Enflurane
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Abstract
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Suction of the airway is often required for removal of secretions in anesthetized patient with artificial airways, since the normal coughing mechanism is disrupted. But endotrache al suction induces arterial oxygen desaturation, mucosal damage, vaso-vagal reactions, cardiac arrhythmias, infection, cardiovascular collapse and even sudden death. The purpose of this study is to evaluate the suction time until SaO2; Decreases to 95%, duration until SaO2 recovers to initial SaO2, hemodynamic changes and arterial blood gas analysis before suction, after-suction and at recovery period in N2O group and O2, group.
The results are as follows;
1) In N2O group the suction time and recovery time are 85.8, l79.l seconds and in O group the suction time and recovery time are 337.6, 41.3 seconds, They are significantly different between both groups.
2) The values of PaCO2 before suction, after suction and at recovery period are 41.3, 48.3 and 43.9 mmHg in N2O group and 43.0, 58.0 and 54.5 mmHg in O2 group. In both groups the values of PaCO2, after-suction and at recovery period significantly increse than that before-suction. The decrease of PaCO2,, values in NO group compared with O group are statistically significant in after suction and recovery period .
3) The changes of arterial blood gas except PaCO2. and the hemodynamic changes are statistically significant in both groups but are in normal ranges and clinically not significant.
In conclusion we think that the safe duration of endotracheal suction are at least 40 seconds in N2O group and l48 seconds in O2 group without clinically significant changes of hemodynamics and arterial blood gas analysis.
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