超音波水晶体乳化吸引術中の眼内灌流液と気泡発生の検討

Relation between irrigating solution and bubble formation during phacoemulsification-aspiration

　超音波水晶体乳化吸引術中に前房に生じる気泡と灌流液との関係を検討した。灌流液にはオペガード^(R)ネオキットを用い，その温度を10℃から5℃刻みで30℃までに設定し，37眼に手術を行った。気泡は3段階に分類した。温度が10℃のとき気泡が手術の障害になったが，15℃以上では軽度であった。実験的にも，灌流液の温度が低いほど気泡が多く発生した。灌流液が低温であると，使用時の温度上昇により空気の飽和溶解量が低下し，気泡が発生しやすくなると解釈した。本灌流液は15℃以上で保存して使用することが望ましいと結論される。

　We evaluated the irrigating solution as related to bubble formation during phacoemulsification-aspiration. We used Opeguard^(R) Neo-kit,a mock aqueous designed for intraocular surgery. Cataract surgery was performed on 37 eyes by setting the temperature of irrigating solution from 10 to 30 degrees℃ at 5-degree intervals. Bubble formation was classified into 3grades for statistical evaluation. Bubble formation was the greatest and interfered with the surgery when the temperature was set at 10 degrees. It became negligible at 15 degrees or over. In vitro experiment showed bubble formation to increase at lower temperatures. It appeared that irrigating solution kept at a low temperature would release dissolved air when it is oversaturated by becoming warmer during surgery. We advocate to store the irrigating solution at the temperature of 15 degrees or over.