Abstract
The technical problmes of colonoscopy has been improved significantly. However, there still remains a serious problem how to relieve the distress of the patient during colonoscopic examination. In our institution, 30% N2O analgesia was performed in 166 cases of colonoscopic examination. It was sufficiently of f ecive in 133 cases (78.9%) of total examines with a prominent sedative and a mild analgetic effect. Our questionnaire about the premeditation in colonoscopy and usefulness of 30% N2O analgesia to several institutions in our country showed that few institutions used sedatives or analgesics as the premeditation and N2O analgetic method was not considered at all for fear of making the patients unconsciousness or insensibility. But actually its rapid effective-ness, good recovery from analgetic condition, no side effect and easy managenent are greatly helpful in reliaving the distress of the patient during colonoscopic examination.
