Abstract
We performed a mass survey using a thin forward-viewing gastrointestinal f iberscope (Olympus GIF-P2) as a direct examination of 624 persons in 1983, comparing these results obtained by using photofluorography and lateral-viewing gastrocamera (Olympus GIF-PF) simultaneously, as a direct examination of 706 persons in 1982, and endoscopy was employed in 1982 (or 1983) for the second step of the screening in 595 (or 690) of 4, 165 (or 4, 595) persons examined in "A" worklace. Furthermore, comparing these results with those obtained in the mass surveys of 1980 and 1981 (or 1982 and 1983) in which a thin forward-viewing gastrointestinal f iberscope, GIF-P2 (or GIF-P3), was employed for the second step of the screening in 583 (or 528) of 3, 276 (or 3, 663) persons examined in "B" workplace. We arrived at the following conclusions : (1) the thin forward-viewing gastrointestinal f oberscope for mass survey permits acculate diagnosis not only of gastric lesions but also of bulbar lesions. (2) there was no significant difference in the rate of discovery of gastric lesions requiring treatment between the two mass surveys in which using the photofluorography and lateral-viewing gastrocamera simultaneously, and in which using the thin forward-viewing gastrointestinal f iberscope, however, less gastric ulcer scars and more duodenal lesions were detected when using the thin forward-viewing gastrointestinal fiberscope. (3) there was a higher discovery rate of upper gastroiotestinal lesions by using the gastrointestinal endoscopy directly than by using it as a secondary step of the examination. (4) there was no significant difference between the two instruments, GIF-P2 and GIF-P3, in the discovery rate of upper gastrointestinal lesions. (5) there was no significant influence by the methods of premedication such as the injection of anti-cholinergic drug or not, and the posture of the examination such as supine position or lateral position. We reconfirmed that the most important factor for performing a mass survey was the mastering of the instruments by the doctor and paramedical staff.
