1979 Volume 21 Issue 2 Pages 198-207
It is well known that a laughing gas (nitrous oxide) is most suitable for artificial pneumoperitoneum during peritoneoscopy. However, the utilization of artificial pneumoperitoneum employing laughing gas in Japan is 20% or less, since commercially available apparatus for pneumoperitoneum employing laughing gas is very expensive. Under these circumstances, we have developed an auxiliary equipment used by attaching to Nomura-type pneumoperitoneum device, to thereby accomplish pneumoperitoneum employing laughing gas. The equipment has produced good results as we expected, that is, it could be safely and easily applied to patients and caused scarcely any pain to patients after peritoneoscopy by means of the equipment as well as during the peritoneoscopy. So, to demonstrate an excellency of the equipment, we gave an outline of the equipment and reported the results of the study of 27 cases as to pneumoperitoneum employing laughing gas by means of the present equipment comparing with 21 cases as to that employing air. The following matters were indicated in the report. The both was substantially the same in the amount of gas initially used in the pneumoperitoneum operation, while, the former was somewhat more in the amount of additionally supplied gas than the latter. There was not a significant difference between the both concerning the variations of blood pressure and concerning pH, Pa02 PaCO3 and so forth determined in the blood gas analysis. The pain caused by the former during and after peritoneoscopy was less than that caused by the latter, and the former was higher in the extinguishing rate of pain than the latter. The average concentration of laughing gas in the blood measured as to 7 examples just before the end of the peritoneoscopic examination was 668 ppm, indicating twentieth or thirtieth of the laughing gas concentration detected during anesthesia.
