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Among 900 cases of laparoscopic tubal Sterilizations, 220 procedures of Yoon`s ring application and 680 procedures of coagulation were performed mostly under the local anesthesia for the recent 5 years from May 1974 to July 1978. Differences between Yoon`s ring and coagulation method were made in various aspects. The results obtained were as follows; 1) The mean age of the patients was 34.3 years. The youngest was 21 years and the oldest 46 years. Age group of 31 to 35 years was most common with the incidence of 42.6%. 2) The average number of living children was 3.0, which encountered in 50.8% of the total and that of two in 23.8%. 3) Induced abortion of 13 times was the largest frequency ever found. 99 cases(11.0%) did not have the history of induced abortion, whereas 8 cases(0.9%) had experienced it more than 7 times. 4) No considerable technical difficulty during the tubal sterilization was encountered with those 103 cases(10.4%) who had previous history of laparotomy such as appendectomy in 99 cases(10.0%) adnexectomy in 3 cases(0.3%) and cesarean section in one case(0.1%). 5) Contraceptive method with oral pill prior to laparoscopic tubal sterilization was 35.7% of total cases, with condom 21.2% and with I.U.D 13.6%, respectively. 214 cases(26.8%), however, had not practiced any contraceptive method. 6) The last pregnancy before this laparoscopic sterilization was terminated by induced abortion in 86.6%, whereas term pregnancy in 13.0%. 7) The interval between outcomes of the last pregnancy and sterilization was one to three years, which occupied 43.3% of total cases. 8) Laparoscopic tubal sterilization was performed under the local anesthesia in 97.8% and under the general Anesthesia in 2.2%. 9) Four to five liters of Co2 gas were consumed for pneumoperitoneum in 74.7% of all cases. 10) Hospitalization for less than 3 hours was required in 66.3% of the coagulation group and 78.4% of the rihg group. 12) The incidental induced abortion followed by sterilization was encountered in 40.2%, an
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