超音波白内障手術時における前房内圧の測定

Anterior chamber pressure during phacoemulsification surgery

（C1-2-5）　超音波白内障手術での条件の設定においては前房の安定度の判断が重要であるので，手術中の前房内圧を測定した。観血血圧測定装置に静脈針を接続し，サイドポートを通して前房内圧を測定した。非吸引時の定常圧，吸引時の定常圧，サージ時のトラフ圧について解析を行った。前房内圧は，灌流圧，吸引圧，流量，使用装置などで変化した。サージ現象が明確に把握でき，最適な諸条件の設定に有用であった。前房内圧の監視は，術中の眼内環境を知る上で有用であり，超音波白内障手術装置にフィードバックすることで，より安全な手術が可能になると期待される。

We quantitated the pressure in the anterior chamber, as the setting of variables during phacoemulsification surgery is dependent on the judgment of stability of the anterior chamber. A hooked needle was connected to a blood-pressure monitoring system and was introduced into the anterior chamber through a limbal port during surgery. Intracameral pressure measurement was performed during no-aspiration, during constant aspiration and during surge phenomenon with trough. The intracameral pressure changed according to irrigation pressures, vacuum pressures, flow rates and the types of phacoemulsifier. Continuous monitoring of intracameral pressure detected the surge phenomenon and contributed to proper setting of surgical variables. The intracameral pressure monitoring was thus useful in stabilizing the intraoperative intraocular environment. A safer surgical procedure will become possible by feedback system of intracameral pressure monitoring system to the phacoemulsification apparatus.