In normal pregnancy, sperm and egg combine to form fertilized egg at the junction of the ampulla of fallopian tube and isthmus. 30 hours after fertilization, the fertilized egg moves toward the uterus with the oviduct peristalsis and tubal epithelial cilia. If the fertilized eggs are not in the uterine cavity before the late blastocyst, ectopic pregnancy may occur. The causes of ectopic pregnancy include salpingitis, tubal dysplasia or dysfunction, failure of intrauterine device contraception, etc. disease factors and bad living habits can increase the risk of ectopic pregnancy.
1. Tubal inflammation. It can be divided into tubal mucositis and salpingitis, both of which are common causes of tubal pregnancy. Serious tubal mucositis can cause complete obstruction of the lumen and cause infertility. The pathological changes of salpingitis are mainly in the serosa layer or seromuscular layer of the fallopian tube, which often causes adhesion around the fallopian tube, distortion of the fallopian tube, narrowing of the lumen, and weakening of the peritubal muscle peristalsis, which affects the operation of the fertilized eggs.
2. History of tubal pregnancy. Women who have suffered from tubal pregnancy are more likely to recur after surgical treatment.
3. Intrauterine device was placed. The use of contraceptive device itself does not increase the incidence of ectopic pregnancy, but if women become pregnant because of contraceptive failure, the chance of ectopic pregnancy is greater.
4. Tubal dysplasia or dysfunction. Hypoplasia of fallopian tube is often characterized by long fallopian tube, poor muscular layer development and lack of mucociliary. The function of oviduct is regulated by estrogen and progesterone. If the regulation fails, the normal operation of fertilized eggs will be affected.
5. The fertilized eggs swim. The egg is fertilized in one fallopian tube, and the fertilized egg enters into the contralateral fallopian tube through uterine cavity or abdominal cavity. If the migration time is too long, the fertilized eggs will grow, and then they can be implanted into the contralateral fallopian tube to form tubal pregnancy.
6. The cause of the disease. The compression of tumors around the fallopian tube, such as uterine fibroids or ovarian tumors, sometimes affects the patency of the fallopian tube and hinders the movement of the fertilized eggs. Endometriosis can increase the possibility of fertilized eggs implanted in the fallopian tube.
7. Multiple induced abortion. Repeated, frequent abortion, will lead to endometrial trauma, embryos are not easy to implantation in the uterine cavity, will be transferred to other places implantation, ectopic pregnancy.
8. Bad living habits. Smoking, drinking and taking ovulation promoting drugs can increase the incidence of ectopic pregnancy.