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Eccyesis or tubal pregnancy as ectopic pregnancy
In an ectopic pregnancy, the implantation of a blastocyst outside the uterine cavity takes place.
Cases of ectopic pregnancies have increased worldwide and have nearly doubled in the last 10 years. This increase is attributed, among other things, to improved diagnosis. Secondly, intrauterine devices (IUDs), ascending genital infections, and infertility treatments are also associated with a high risk for ectopic pregnancy.
Causes of ectopic pregnancy
The most common location for ectopic pregnancy is the fallopian tube (tubal pregnancy). The uterine tube is divided into the ampulla, isthmus, and intramural portion. Comparably, the ampulla is affected more often. The isthmic and intramural portions are affected less often.
Approx. 1% of ectopic pregnancies can affect the uterus, ovary, peritoneum (abdominal pregnancy), or the cervix.
Origin and development of ectopic pregnancy
The tubal mucosa is similar to the endometrium of the uterus in its ability to undergo decidualization, although not to a comparable extent. When a fertilized egg is not yet in the uterine cavity by the 5th or 6th day, it is implanted at its then-current location, which is usually the tube.
The reasons for ectopic pregnancy may include disorders connected with the ovulation mechanism and tubal passage. The tube may be blocked due to congenital or acquired anomalies. In addition, functional impairment is possible in terms of the disruption of ciliary activity or tube motility.
Frequently, adhesions cause the blockage of transport from the fimbriae to the uterine cavity. This can happen due to inflammation as in the case of adnexitis. Adhesions can also be caused by endometriosis implants, surgical interventions (for example scarring), or previous ectopic pregnancies.
Women with an IUD are more often affected by ectopic pregnancy than women without IUDs. Decreased peristalsis might be the reason.
Symptoms of ectopic pregnancy
Ectopic pregnancy is an important differential diagnosis in cases of acute abdomen. Here, the symptoms vary greatly. It depends on the localization of the ectopic pregnancy, the condition of the product of conception (the embryo may be intact or already dead), and the age of the pregnancy. Thus, asymptomatic processes or severe presentations, including circulatory shock, are possible. In addition, classical symptoms and signs of pregnancy may be present. These include breast tenderness and morning sickness.
Initially, secondary amenorrhea is usually present. After about 5 weeks, unilateral pain appears in the adnexal region. This may also be accompanied by spotting. This bleeding usually corresponds to a hormonal withdrawal bleeding and is less associated with direct bleeding from the tube.
Pain symptoms in the shoulder area may arise if the tube has been already ruptured (often the result of ectopic pregnancy at the isthmus) and if there is intra-abdominal bleeding. This pain is caused by the irritation of the phrenic nerve.
DiagnosisA clinical examination is indicated in addition to a history of abdominal pain and secondary amenorrhea. On palpation of the lower abdomen, pain with pressure and pain on the movement of the cervix are present. Subsequently, a laboratory analysis must be initiated. An increased serum beta-HCG concentration would still be detectable even with a negative pregnancy test. Thus, beta-HCG plays an important role in the diagnosis. Furthermore, an ultrasound examination is crucial. In this case, an empty uterine cavity without an amniotic sac is detected. Often a pseudo-gestational sac is visible. This is caused by the accumulation of fluid in the endometrium and looks similar to the fetal sac. You may also see an enlargement of the tube with the amniotic sac. Frequently, the tube has already ruptured, and the examiner may observe free fluid (blood) in the pouch of Douglas.
The diagnosis of ectopic pregnancy is a high possibility in the presence of these findings. However, the diagnosis must be confirmed by laparoscopy.
Diseases similar to ectopic pregnancy
Other reasons for an acute abdomen must be ruled out, in addition to gynecological causes. These include sigmoid diverticulitis or appendicitis.
Other gynecological differential diagnoses include endometriosis, acute adnexitis, abortion, ovarian torsion, and urological colic.
It is important to note that none of the above differential diagnoses cause hemorrhagic shock and that any cause of hemorrhagic shock is a surgical emergency.
Treatment of ectopic pregnancy
Therapeutically, diagnostic-therapeutic pelviscopy is used. The radical nature of the treatment will depend on the patient’s desire to have children. For those desiring children, a conservative organ-preserving procedure is applied. However, this increases the risk of recurrence of an ectopic pregnancy.
A salpingostomy can be performed for ectopic pregnancy. Here, a longitudinal incision is made, and the gestational sac is removed from the tube. If future childbirth is undesired, the affected tube is removed (salpingectomy).
In the early stages of ectopic pregnancy, conservative action is also possible and comprises drug therapy. In the case of local treatment, prostaglandins or methotrexate can be injected. Likewise, systemic drug therapy is possible with intramuscular methotrexate administration. This causes the death of the embryo. Conservative treatment may be applied if there is no evidence of bleeding or rupture.
In the course of treatment, beta-HCG should regularly be checked.
Probability of ectopic pregnancy recurrence
The probability of ectopic pregnancy recurrence is very high, with a recurrence rate of 5–20%.