[Sterilization by the Irving method. On the work of P. Schrank: On the avoidance of sterilization failures. Geburtshilfe und Frauenheilkunde 28 (1968), 348].
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Advances in female sterilization have been made over the last five years in both its techniques and medico-social acceptance. Prior to 1970, the majority of tubal sterilizations were carried out by partial or complete surgical excision of both tubes by laparotomy in most cases, or by partial salpingectomy by an anterior or posterior colpotomy in selected cases. The traditional operations by the abdominal route comprised the Madlener method, the Pomeroy method, the Irving method and the Aldridge method. These methods will not be discussed further.
Sterilisation by the Irving procedure accompanying caesarean section was the favoured form of sterilisation at Paarl Hospital from 1971 to 1985. No subsequent pregnancies have been reported from the 200 cases and this success is compared with sterilisation failure rates of 1.35% with the Pomeroy method, 1.27% with the total fimbriectomy method, 0.41% with the Vienna or modified Pritchard method, and 0.89% with the Filshie-clip method: Irving sterilisation is accordingly advised as the method of choice at the time of caesarean section.
A comparison of the standard Vienna method of postpartum sterilisation (3,580 patients with 18 failures and a sterilisation failure rate of 5.03/1,000) with 4 other methods at Paarl Hospital is presented: the Pomeroy method (892 patients with 19 failures and a sterilisation failure rate of 21.31/1,000); the total fimbriectomy method (1,578 patients with 23 failures and a sterilisation failure rate of 14.58/1,000); the Filshie clip method (808 patients with 18 failures and a sterilisation failure rate of 22.28/1,000); and the Irving method performed at caesarean section (456 patients and 1 failure). As no totally permanent technique exists to prevent pregnancy, a plea is lodged for legalised abortion after failed sterilisation.
Failure of the Irving method of Bilateral tubal ligation is rare, as evidenced by the absence of a current previous report in the literature. The present case represents an infrequent technical failure of this established method of female sterilization. The literature and possible causes of failure are reviewed and a form of management is considered. Treatment of this patient was influenced by the presence of additional gynecologic abnormalities.
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Seventy-three patients who underwent a microsurgical tubal reversal were reviewed in an effort to determine what factors influenced outcome. A 64% intrauterine pregnancy rate was achieved 6 months to 4 years postoperatively. There was a 4.4% incidence of ectopic pregnancies in this group. On the basis of a preoperative laparoscopy, no reversals were performed unless a total tubal length of 4 cm or more could be obtained. The final tubal length, the time interval from sterilization to reversal, and the site of reanastomosis did not influence the eventual outcome. The reversals were then evaluated by the type of sterilization procedure performed (Pomeroy, coagulation, falope ring, and Irving). The pregnancy rate was not statistically different in each group. Sterilizations performed by coagulation, however, were only reversible 58% of the time compared to 91% for the noncoagulation procedures because of extensive tubal destruction (p less than 0.001). It also took longer for the coagulation patients to conceive, with the average conception occurring in 13.0 months compared to 6.7 months for the noncoagulation group (p less than 0.001). A higher incidence of ectopic pregnancies occurred in the thermal burn patients as well. The longer interval for conception and the higher ectopic pregnancy rate may represent mucosal damage in coagulation patients beyond the anastomotic site.
A prospective study of 102 patients who underwent a reversal of sterilization between January, 1977, and February, 1982 revealed a pregnancy rate of 68% after more than 1 year of follow-up. The term delivery, abortion, and ectopic pregnancy rates were 52%, 11%, and 5%, respectively. The most reversible procedure was placement of the Falope ring (83% term delivery), and the least reversible was fimbriectomy (29%). The use of the microscope in performing tubal operation was associated with term delivery rates (60%) higher than those when no microscope was used (44%); this was particularly significant after tubal cautery (50% versus 25%). A total remaining tube length of 6 cm or more after previous sterilization resulted in a much better (74%) term delivery rate after microsurgical procedures than that in patients with shorter tubes (44%). The most successful site for tubal anastomosis was isthmus-isthmus and cornu-isthmus, with 81% and 67% term delivery rates, respectively.
A prospective study of 113 personal consecutive microsurgical reversals of female sterilization during the 6-year period from 1979 to 1984 was carried out to determine factors affecting the pregnancy rate. The sterilizations were performed by laparoscopic unipolar coagulation in 54% of the patients, by the Pomeroy technique in 28%, by fimbriectomy in 8%, by the Irving operation in 5%, and by clips or rings in 4%. In the group with no minimum follow-up period, 50% had intrauterine pregnancies and 5% had ectopic gestations. Eighty-nine patients had at least 12 months of follow-up after reversal surgery. This group is studied in detail. Factors affecting the pregnancy rate were length of tube, type of sterilization performed, anastomotic site, and availability of both tubes for reconstruction. Age, parity, and interval from sterilization to reversal surgery did not affect the pregnancy rate. Fifty percent of the intrauterine pregnancies were conceived within 6 months of reversal surgery.
One hundred sixty-eight cases of puerperal laparoscopic sterilization are presented. The operative technique, complications, and morbidity are discussed. Intraoperative and postoperative complications occurred in six patients (3.6%). Operative time (21 minutes) and postoperative stay (2.4 days) compared favorably with those of the concurrent series of 148 open postpartum ligations. It was concluded that puerperal laparoscopic sterilization in expert hands is a safe, viable alternative to laparotomy.
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Restoration of tubal patency after surgical sterilization in which the luminal continutiy is interrupted requires either uterine implantation of the patent distal segment or resection and end-to-end anastomosis of patent adjacent segments. Although it is logical to assume that after most tubal ligations the intramural segment remains normal and end-to-end anastomosis is possible, both segments should be evaluated and tested prior to the plastic reconstruction. The results of 178 operations collected from the literature and the author's 23 attempts at surgical reversal of previous tubal operations for surgical sterilization were described. The over-all pregnancy rate after resection and end-to-end anastomosis was 39.0%; after uterotubal implantation, it was 19.4%. The latter procedure was performed in 60% of the patients. The small series of reports makes it difficult to evaluate conception rates or to judge the merits of specific reconstructive operative techniques.
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