We compared relations between methods of anesthesia and bood loss in 20 patients with chronic nasosinusitis (40 sinus sides), each of whom underwent operations on one sinus side under hypotensive anesthesia and on the other under conventional normotensive anesthesia. The patients who had the first operation under hypotensive anesthesia and the second one under conventional normotensive anesthesia were assigned to A group. The patients who had the first and the second operations in reversed order were assigend to B group. C group consisting of the patients who underwent the operation under local anesthesia was made the control group. As a result, in the A group the mean total blood loss was 227 ml with the mean minute volume 8.8ml/min under conventional normotensive anesthesia, under hypotensive anesthesia the former was 84.4ml with the latter 3.5ml/min. The B group showed that the mean total blood loss was 223 ml with the mean minute volume 4.9ml/min under conventional normotensive anesthesia and that the former was 140ml with the latter 3.3ml/min under hypotensive anesthesia. In both A and B groups, the mean blood loss diminished under hypotensive anesthesia from under conventinal normotensive one. Comparison between the results of the A and B groups and the C group demonstrated that conventional normotensive anesthesia produced larger blood loss than did local anesthesia but that there were no differences in blood loss between under hypotensive anesthesia and local anesthesia.
