What is Ectopic Pregnancy?
Clinically, ectopic pregnancy is defined as a pregnancy where the fertilized egg implants and develops outside the uterine cavity, also known as extrauterine pregnancy. It is a common acute gynecological emergency that poses a serious threat to women’s reproductive health and even life if not diagnosed and treated in a timely manner. Understanding the causes, clinical manifestations and related knowledge of ectopic pregnancy is crucial for early detection and standardized treatment.
We know that under normal circumstances, sperm and egg meet in the fallopian tube to form a fertilized egg. After 7 days of movement, the fertilized egg enters the endometrium, a process called "implantation", and then develops into a fetus in the uterine cavity. However, when the fallopian tube lumen becomes narrow due to inflammatory swelling or other reasons, the fertilized egg often gets stuck in the fallopian tube, resulting in ectopic pregnancy. As the fertilized egg grows and develops here day by day, it will inevitably "rupture" the fallopian tube, which lacks stretching capacity, leading to severe bleeding. Some women have excessively long or tortuous fallopian tubes, which delay the fertilized egg’s arrival in the uterine cavity, causing it to implant in the fallopian tube—this is also a cause of tubal pregnancy. Occasionally, some women undergo tubal reanastomosis after sterilization in order to have children again. Due to the narrowness of the reanastomosed site, the transport of the fertilized egg is easily blocked, leading to tubal pregnancy, though this situation is relatively rare.
According to clinical statistics, tubal pregnancy accounts for about 90% of all ectopic pregnancies. Other types include cervical pregnancy, cornual pregnancy, intramural pregnancy, broad ligament pregnancy, abdominal pregnancy, ovarian pregnancy, and retroperitoneal pregnancy. The term "ectopic pregnancy" is derived from its literal meaning, while "extrauterine pregnancy" is a more accurate description in medical terms.
Clinical Manifestations of Ectopic Pregnancy
Before rupture, ectopic pregnancy often has no obvious symptoms, making it difficult to detect in the early stage. Many patients experience some early pregnancy reactions after amenorrhea, such as loss of appetite, nausea, and pica. Some also have a small amount of vaginal bleeding accompanied by dull or distending pain in the lower abdomen, which is caused by the gradual growth of the embryo in the fallopian tube, leading to excessive distension of the fallopian tube. In some patients, the pain is not obvious; during a gynecological examination, the uterus is slightly enlarged and softened, and a mass or soft, thickened area with slight tenderness can be felt.
After the rupture of ectopic pregnancy, the condition undergoes a qualitative change. The patient suddenly experiences tearing pain in the lower abdomen, which is persistent and gradually intensifies, accompanied by a feeling of nausea. This is mainly caused by blood flowing into the abdominal cavity after the rupture of ectopic pregnancy, stimulating the nerves there. In the early stage, blood accumulates in the lower abdomen, causing localized lower abdominal pain accompanied by a desire to defecate. As the blood volume increases and fills the abdominal cavity, general abdominal pain may occur. If the blood stimulates the diaphragm, the pain can also radiate to the shoulder blade area, causing pain there. If bleeding continues, syncope and shock may occur.
According to clinical statistics, about 1/3 of patients will experience internal bleeding due to ectopic pregnancy rupture and be in a state of shock or pre-shock upon admission. If not treated in a timely manner, it can be life-threatening. It is worth noting that women of childbearing age who have a history of pelvic inflammatory disease, tubal surgery, or irregular menstruation are at a higher risk of ectopic pregnancy. Once they have amenorrhea, irregular vaginal bleeding, or lower abdominal pain, they should seek medical attention immediately for relevant examinations (such as blood HCG testing and pelvic ultrasound) to rule out ectopic pregnancy.