Endoscopic transvaginal approach to the rabbit uterine cervix: improvement in the technique of selective tubal catheterization

Hysteroscopy and the butyl-cyanoacrylate on experimental sterilization of rabbit uterine tubes

PURPOSE: To assess the sterilization effectiveness on uterine tube of rabbit by the cyanoacrylate adhesive. METHODS: Hysteroscopy tubal catheterization was performed randomly in 12 animals (24 uterine tubes) assigned to the sham group (GS) and 15 animals (30 uterine tubes) to the n-butyl-cyanoacrylate (GB). The female rabbits were observed during 30, 90 and 180 days and mated to fertile males. The no pregnant rabbits were submitted to in vitro burst pressure test for patency by air insufflation (40 mmHg). The microscopic assessment was performed to parameters of damages in epithelium caused by the adhesive, the degree of inflammatory process, morphometry data values of tube diameter (UT) (cm), mucosa thickness (MT) and the myosalpinx thickness (MyT) (mm). The mucosa cells densitometry (total optical density) was expressed by the amount of DNA. The significance of the differences in histological scores and in thickness measurements were made by ANOVA test (P value < 0.05). RESULTS: In all animals of GB: the adhesive was attached to the mucosa; there was no pregnancy; no records of significant degree on inflammatory process; the patency test was negative and densitometry of DNA showed similar values to the both groups independently of observation periods. The layers thickness of GB-UT(1.118±0.117), GB-MT(0.447±0.247) and GB-MyT(0.853±0.097) were larger than the GS-UT(0.666±0.409), GS-MT(0.211±0.070) and GS-MyT(0.442±0.143). CONCLUSION: This approach offers a safe and feasible method of uterine tube obstruction.

Esterilização tubária com adesivo cirúrgico sintético: estudo experimental

OBJETIVO: Estudar a perviedade da tuba uterina de coelhas submetidas a aplicação endotubária pela via transvaginal de n-butil-2-cianoacrilato. MÉTODO: Vinte coelhas (Orictolagus cuniculus) da linhagem Nova Zelândia foram distribuídas em dois grupos, 1 (controle) e 2 (experimento). O grupo controle foi submetido a técnica operatória para esterilização pelo método proposto por Pomeroy e o grupo experimento teve a aplicação de 0,25mL do adesivo cirúrgico n-butil-2-cianoacrilato no lúmen tubário por via transvaginal. Após quatro semanas e quatro acasalamentos e o diagnóstico clínico da presença de gestação, foram submetidos a três testes de perviedade: histerossalpingografia (in vivo), teste de perviedade com corante azul de metileno (in vitro) e teste de pressão de rompimento (in vitro). Foi realizada a morfometria computadorizada digitalizada para medir o diâmetro tubário, a mucosa e o miossalpinge. RESULTADOS: Houve vazamento em somente uma tuba uterina do grupo 2, embora o adesivo estivesse presente no lúmen tubário, o que foi não significante estatisticamente. Apresentou significância estatística a morfometria, que mostrou aumento nas medidas do diâmetro tubário, da mucosa e do miossalpinge, que consideramos ser pela presença do polímero formado pelo adesivo, não havendo danos celulares. CONCLUSÕES: Concluímos que a aplicação transvaginal de n-butil-2-cianoacrilato no lúmen tubário de coelhas é tão eficaz para esterilização quanto o método de Pomeroy.

A review of selective salpingography and fallopian tube catheterization

Use of selective salpingography and fallopian tube recanalization has revolutionized the diagnosis and treatment of infertility. Selective salpingography, a diagnostic procedure in which the fallopian tube is directly opacified through a catheter placed in the tubal ostium, has been used since the late 1980s to differentiate spasm from true obstruction and to clarify discrepant findings from other tests. In fallopian tube recanalization, a catheter and guide wire system is used to clear proximal tubal obstructions. The recanalization procedure is simple for interventional radiologists to perform and is successfully completed in most patients (71%-92%). Pregnancy rates after the procedure have been variable, with an average rate of 30%. The combination of selective salpingography with fallopian tube recanalization has improved the overall management of infertility caused by tubal obstruction. The same catheterization technique used in fallopian tube recanalization is currently being explored for use in tubal sterilization.