One lung ventilation with a double lumen endobronchial tube during thoracic anesthesia is necessary for the protection of the healthy lung from contamination by spilage of secretion from the diseased lung and for offering acceptable condition for
the
surgeon.
In this study, 15 ASA Class 1& 2 patients who were scheduled for thoracoscopy by one-lung ventilation were selected. They were intubated with a double lumen endobronchial tube and were ventilated with 100% oxygen.
Arterial blood gases were analysed, and mean arterial pressure and pulse rate were measured at three stages (stage Ⅰ: two-lung ventilation after anesthetic induction and intubation, and 15 min after positioning to lateral decubitus, stage Ⅱ:
one-lung
ventilation, 15 min after lung collapse, and stage Ⅲ: two-lung ventilation, 15 min after reinflation of operative lung).
Arterial blood gas analysis shows that pH and base excess decreased significantly at stage Ⅲ compaired with those of stage Ⅰ (p<0.05). Arterial oxygen tension decreased significantly at stage Ⅱ but was not significant clinically, and arterial
carbon
dioxide tension and oxygen saturation did not change significantly at all stages.
Mean arterial pressure increased significantly at stage Ⅱ compaired with that of stage Ⅰ (p<0.05) without clinical significance, and heart rate also increased significantly at stage Ⅲ compaired with that of stage Ⅰ (p<0.05) without clinical
significance.
We concluded that when thoracoscopy was performed in lateral decubitus position by use of one-lung ventilation with 100% oxygen.
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