Effects of Nitrous Oxide Administration on Para-aortic Line Obliteration in Postoperative Chest Film.

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  • 術後胸部単純写真における傍大動脈線消失に及ぼす亜酸化窒素投与の影響

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Abstract

To examine the effects of nitrous oxide administration on atelectasis produced during general anesthesia evaluated by para-aortic line obliteration on postoperative plain chest X-ray films, 175 ASA 1-2 patients undergoing elective major surgery (82 upper abdominal, 54 lower abdominal and 39 head/neck operations) were evaluated. Subjects were allocated to Group G (with nitrous oxide) or Group A (no nitrous oxide) and postoperative chest X-ray film was studied within 1hr of emerging from anesthesia and para-aortic line obliteration ratio (PALO) was measured as division of obliterated by the total para-aortic line length. Upper abdominal surgery patients resulted in a significant increase of PALO than lower or head/neck surgery patients in both Group G and A. PALO of Group G was significantly higher than of Group A in upper abdominal surgery patients. However, there was no difference of PALO between two groups in lower abdominal and head/neck surgery patients. In conclusion, nitrous oxide results in minimal effects on PALO during lower abdominal and head/neck surgery, while it increases PALO during upper abdominal surgery.

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