Summary
Highlights
Ectopic pregnancy refers to any pregnancy that implants outside the uterine cavity. While the uterus is the typical site, ectopic pregnancies can occur in several other locations, including the fallopian tubes (the most common site, accounting for over 99% of cases), the cervix, ovaries, or even within a C-section scar.
An ectopic pregnancy cannot continue to term and typically results in abortion or rupture. Unlike a normal pregnancy, it won't receive adequate nutrition and space to develop, leading to complications. The primary concern is rupture of the affected organ, often the fallopian tube, which causes severe internal bleeding (hemorrhage) and can quickly lead to hypovolemic shock and be life-threatening for the patient. Early detection and intervention are crucial to prevent these severe outcomes.
The main cause of ectopic pregnancy is any factor that impedes the normal passage of the fertilized egg into the uterus. This often includes adhesions or inflammation around the fallopian tubes, frequently resulting from pelvic inflammatory disease (PID). Other risk factors include a history of previous ectopic pregnancy, certain contraceptive methods like IUDs (though rare, if pregnancy occurs with an IUD, it's more likely to be ectopic), and endometriosis. Some cases may be idiopathic and have no clear cause.
Symptoms often include abdominal pain (which can be localized and mistaken for appendicitis), vaginal bleeding, and amenorrhea (missed period). Diagnosis relies on a combination of pregnancy tests and imaging. A positive pregnancy test (especially quantitative hCG) is crucial. Ultrasound, particularly transvaginal ultrasound, is used to visualize the uterus for an intrauterine pregnancy. If hCG levels are above a certain threshold (e.g., 1500-1800 mIU/mL) and no intrauterine pregnancy is seen, ectopic pregnancy is highly suspected. Monitoring hCG levels over 48 hours is vital; a suboptimally rising or decreasing level further indicates an abnormal pregnancy, possibly ectopic or a miscarriage.
Management depends on the patient's condition and the characteristics of the ectopic pregnancy. Medical management with methotrexate is an option for stable patients with small, unruptured ectopic pregnancies and without contraindications. Methotrexate works by inhibiting cell growth, leading to the termination of the pregnancy. Surgical management, typically via laparoscopy, is indicated for unstable patients, those with ruptured ectopics, larger masses, or when methotrexate fails. Surgical options include salpingostomy (removing the ectopic pregnancy while preserving the fallopian tube) or salpingectomy (removing the entire fallopian tube), depending on the tubal damage and patient's fertility desires.
The treatment approach varies based on the specific ectopic site. Cornual pregnancies, found at the junction of the fallopian tube and uterus, require careful consideration due to high rupture risk and bleeding; wedge resection of the cornua may be necessary. Cervical pregnancies, implanting in the cervix, also pose a high risk of hemorrhage and often require surgical removal or local injections. Ovarian and abdominal pregnancies are rare and typically managed surgically due to the risk of significant blood loss and complications. In some cases, conservative management with close monitoring might be considered for very early, stable cases, but it's generally avoided due to significant risks.