麻酔ガス汚染監視データベースの経時的分析

抄録

Presently almost all of the surgical operating rooms are equipped with the anethestic gas scavenging system, which enables to prevent diffusion of waste anestheic gas at high concentrations in the operating room. However, still occasinally air in the operating room is contaminated with anesthetic gas at high concentrations due to poorly checked anestheia appatatus, misconnection of pipes in the anesthetic gas scavenger, or poor manipulation thechnique of anesthesia, only temporarily through. At the surgical center of Kagoshima University Hospital, the air in the operating room collected from the exhaust outlet in each operating room has been collected through the sampling pipes to be watched intensively. An anesthetic pollution monitoring system (APMS) was developed in 1986 to indicate the state of aneshetic gas concentrations in all the operating rooms by means of the infrared spectrophotometer (Miran 103 Analyzer). There is a hypothesis stating that anesthetic gas pollution of the air in the operating room frequently occurs at the induction stage of anesthesia when the facemask is changed to the endotracheal tube. In this study it was tried to clarify such hypothesis by means of the quantitative analysis of the APMS database. Onset frequency of anesthetic gas pollution at the abnormal level and the alarming level in 9,070 samplings during the subject period (7,050 sampling of adult anesthesia and 2,020 samlings of pedeatric anesthesia), except those less than 25 ppm of nitrous oxide gas concentration, was 825 (9.1%), which was broken to 493 adults (6.99%) and 332 children (16.4%). As the result, it was known that regardless of adults or children, anesthetic gas pollution was apt to onset frequency in the induction stage of anesthesia, being clarified on the basis of 704 cases under inhalation anesthesia.