Ectopic pregnancy

Ectopic pregnancy is not just a medical anomaly, but a serious condition that threatens a woman's life. It occurs when a fertilized egg implants outside the uterine cavity, most often in one of the fallopian tubes. Such localization is impossible for normal fetal development: the tissue of the tube does not stretch like the uterus, and over time it ruptures under the pressure of the growing embryo. This leads to internal bleeding, shock, and, without timely assistance, death. It is important to understand: ectopic pregnancy is not an "incorrect" pregnancy, but a pathological process that requires immediate intervention. It does not end in childbirth, cannot be preserved, and is not an option for "alternative pregnancy." It is always a pathology that needs to be recognized at an early stage — even before the appearance of acute symptoms.

Classification of the disease according to ICD-10

In the International Classification of Diseases, 10th Revision (ICD-10), ectopic pregnancy is classified under the section "Complications of pregnancy, childbirth, and the puerperium" (code O00–O08). Specifically, ectopic pregnancy is coded as **O00**. Under this code, the subtypes are distinguished:

• O00.0 — tubal pregnancy (in the fallopian tube);
• O00.1 — ovarian pregnancy (in the ovary);
• O00.2 — abdominal pregnancy (in the abdominal cavity);
• O00.3 — cervical pregnancy (in the cervix);
• O00.4 — isthmic pregnancy (in the isthmus of the uterus — the transitional zone between the cervix and the body of the uterus);
• O00.8 — other specified forms;
• O00.9 — unspecified ectopic pregnancy.

This classification is important not only for statistics but also for clinical practice: for example, cervical and isthmic forms are particularly dangerous due to the high risk of massive bleeding even in early stages, while tubal is the most common (up to 95% cases), but sometimes allows for the detection of pathology before the rupture of the tube. Each subtype requires its own tactics for diagnosis and treatment — for example, in abdominal pregnancy, more extensive surgical preparation may be needed than in typical tubal form.

The history of the disease and interesting historical facts

Ectopic pregnancy has been known to humanity since ancient times. Already in Egyptian medical papyri (for example, in the Ebers Papyrus, ca. 1550 BC), there are descriptions of conditions that today can be interpreted as consequences of tube rupture: “the woman loses a lot of blood from the vagina, her abdomen swells, she loses consciousness.” However, the first reliable description and diagnosis were made only in the 18th century.
In 1708, French obstetrician François Morand first described a case of tubal pregnancy during an autopsy. But a real breakthrough occurred in 1883 when English surgeon Samuel Hadden performed the first successful operation to remove a tubal pregnancy — the patient survived. Until that moment, the mortality rate in this condition exceeded 90%. Interestingly, in the 19th century, doctors often confused ectopic pregnancy with abortions or ovarian tumors — due to the lack of imaging methods and biochemical tests.
One of the most remarkable historical cases is an abdominal pregnancy described in 1916 in the "British Medical Journal." A woman gave birth to a live child after 37 weeks, despite the embryo developing on the surface of the omentum. The child survived, but the mother did not: she died from bleeding a few hours after childbirth. Today, such cases are exceptions, but they demonstrate how complex and unpredictable the course of this condition can be.

Epidemiology (statistics of disease occurrence)

Ectopic pregnancy occurs in about **1–2% of all clinically established pregnancies** in developed countries. In Russia, according to Rosstat and the Ministry of Health over the past five years, this figure has fluctuated between **1.3–1.8%**, with a slow increase observed — by 0.2–0.3% per year. The reason is considered to be the increasing number of women with risk factors (inflammatory diseases, IVF, age over 35).
The mortality rate from ectopic pregnancy in the Russian Federation in 2024 was **0.8 cases per 100,000 live births**, which is significantly lower than the figures of the 1990s (up to 5–6 per 100,000), but still higher than in Europe (0.2–0.4). The main reason is late seeking of help: about 30% of patients are admitted to the hospital already with signs of tube rupture and hemoperitoneum.
It is important to note: among women who have undergone in vitro fertilization (IVF), the rate of ectopic pregnancy is higher — up to **2–5%**, especially if methods of embryo transfer to the uterus were used under ultrasound control without sufficient accuracy. The proportion of cases also increases with repeated ectopic pregnancies: after the first case, the risk of recurrence is 10–15%, after the second — up to 30%.

Genetic predisposition to this disease

There is no direct genetic link, as in hereditary syndromes (for example, Marfan syndrome), in ectopic pregnancy. However, there are genes that affect the structure and function of reproductive organs, which indirectly increases the risk. Recent studies indicate the possible role of the following genes:

• HOXA10 and HOXA11 — regulate the development of the fallopian tubes and endometrium; mutations can lead to structural abnormalities of the tubes;
• ESR1 and ESR2 — estrogen receptor genes; their polymorphisms are associated with impaired peristalsis of the tubes;
• IL-1β, TNF-α, IL-6 — cytokines involved in inflammatory reactions; their increased expression is associated with chronic salpingitis;
• MTHFR C677T — a mutation affecting folic acid metabolism, may contribute to thrombophilia and microcirculation disorders in the wall of the tube.

But it is important to emphasize: none of these markers are used in routine diagnostics. Genetic testing is only prescribed as part of research or in recurrent cases when searching for the cause of repeated ectopic pregnancies. In practice, acquired changes — for example, scars after inflammation or surgeries — play a decisive role, not genes.

Risk factors for the development of this disease

Risk factors are divided into modifiable (those that can be changed) and non-modifiable (congenital or age-related). Here are the main groups:
Non-modifiable:

• Age over 35 years;
• Developmental anomalies of the fallopian tubes (for example, a bicornuate uterus, narrowing of the tube lumen);
• Previous ectopic pregnancy;
• Hereditary predisposition to inflammatory diseases (not genetic, but familial — for example, frequent infections in female relatives).

Modifiable:

• Sexually transmitted infections — chlamydia, gonorrhea, mycoplasmosis. They cause salpingitis, leading to adhesions and deformation of the tubes. According to WHO, up to 50% cases of ectopic pregnancy are associated with chlamydia;
• Surgical interventions on the fallopian tubes — recanalization, plastic surgeries, even laparoscopy for endometriosis;
• Use of intrauterine devices (IUD) — the IUD itself reduces the overall risk of pregnancy, but if it does occur, the likelihood of ectopic pregnancy increases to 50%;
• Smoking — nicotine disrupts the peristalsis of the tubes and reduces the quality of the mucosa, which slows down the movement of the egg;
• IVF and ovulation stimulation — especially when transferring multiple embryos or in the presence of concomitant endometriosis;
• Prolonged use of progestogens (for example, in contraceptives) — may affect the motility of the tubes.

If your task is to minimize risk — start with the prevention of STIs, quitting smoking, and regular gynecological check-ups when planning a pregnancy.

Diagnosis of this disease

The diagnosis is made comprehensively: based on history, clinical picture, laboratory and instrumental data. The main thing is not to miss the "silent" form, when symptoms are minimal, but progression is occurring.
Main symptoms:

• Delay of menstruation (often — vague, scanty "spotting" instead of periods);
• Dull or stabbing pain in the lower abdomen, often unilateral;
• Bloody discharge from the vagina (not necessarily abundant);
• In case of rupture — sharp "stabbing" pain, weakness, dizziness, tachycardia, pallor of the skin (signs of shock).

Laboratory tests:

• The level of β-hCG in the blood — is a key marker. In a normal pregnancy, it doubles every 48 hours. In an ectopic pregnancy — the increase is slowed (doubling in 72+ hours) or plateau. If the hCG level >1500–2000 mIU, and the gestational sac is not visible on ultrasound — this is a "red flag";
• Progesterone — in ectopic pregnancy is usually below 10 ng/ml (in normal pregnancy — above 15–20);
• General blood analysis — decrease in hemoglobin and hematocrit in case of internal bleeding;
• Smear for flora and PCR for STIs — to identify the infectious background.

Radiological examinations:

• Transvaginal ultrasound — method of choice. They look for: gestational sac outside the uterus, fluid in the posterior cul-de-sac, enlargement of the tube, "ring" around the embryo ("sign of the ring");
• Diagnostic laparoscopy — gold standard in unclear cases, especially if there is suspicion of rupture;
• MRI of the pelvis — rarely, in case of suspicion of rare forms (abdominal, cervical).

Differential diagnosis:
Ectopic pregnancy must be distinguished from:

• Miscarriage (threat of miscarriage) — here hCG rises, but slowly, ultrasound shows gestational sac in the uterus;
• Appendicitis - pain often on the right side, fever, leukocytosis;
• Ovulatory pain syndrome - single pain, without menstrual delay;
• Ovarian cysts with rupture - sharp pain, but hCG negative;
• Uterine fibroids with necrosis - ultrasound reveals a node, not a gestational sac.

Treatment

Treatment depends on the term, localization, the patient's condition, and the desire to preserve fertility. It can be conservative (medicinal) or surgical.
General treatment:
Before any intervention - stabilization of the condition: intravenous solutions (saline, sodium bicarbonate), oxygen, monitoring of blood pressure and pulse. In case of shock - blood transfusion or its components. Under no circumstances should antispasmodics be prescribed without clarifying the diagnosis - they mask symptoms and delay the time until surgery.
Pharmacological treatment:
Used in the early stage (hCG < 5000 IU/ml, size of the formation < 3.5 cm, absence of heartbeat, no signs of rupture). The drug of choice is **methotrexate** (MTX), an antifolate that blocks the division of trophoblast cells.

Administration method: a single intramuscular injection of 50 mg/m² of body surface area (usually 1–1.5 mg/kg). After 4 days - control of hCG. If it has decreased by less than 15%, a second injection is given. In total - up to 3 doses. Folate (1 mg/day) is prescribed from the 2nd day to protect healthy cells.

Contraindications to MTX:

• Intrauterine pregnancy (even if suspected);
• Liver or kidney failure;
• Leukopenia, thrombocytopenia;
• Active infections;
• Breastfeeding.

Surgical treatment:
Indications: tube rupture, hCG > 5000 IU/ml, size > 3.5 cm, MTX ineffectiveness, desire to preserve fertility (in some cases).
Two main approaches:

• Salpingectomy — removal of the entire tube. Indicated in case of rupture, severe adhesions, lack of desire to have children in the future. Faster, more reliable, lower risk of recurrence;
• Salpingostomy — incision of the tube, removal of the embryo, preservation of the tube. Performed laparoscopically. Requires strict monitoring of hCG after surgery (risk of residual tissue). Probability of preserving fertility — 60–70%, but risk of recurrent ectopic — 15–20%.

In cervical or isthmic pregnancy, endoscopic resection with subsequent cervical tamponade is used. In abdominal cases — laparotomy with removal of the gestational sac and hemostasis.

List of medications used to treat this disease

Here are the main drugs used in the treatment of ectopic pregnancy, with dosages and administration regimens indicated:

Tablets 10 mg, solution 30 mg/ml

Important: all medications are prescribed only by a doctor. Self-treatment with methotrexate is life-threatening.

Disease monitoring

After treatment, strict monitoring is necessary to exclude residual tissue and prevent complications.
Control stages:

• 2–3 days after MTX — β-hCG analysis. The decrease should be ≥15% from baseline;
• 7 days later — repeat hCG. If it has not decreased to 15% — a second injection or transition to surgery;
• 14–21 days later — hCG should be < 5 IU/ml. If not — look for residual tissue (ultrasound, laparoscopy);
• After 1 month — pelvic ultrasound, gynecologist examination;
• In case of surgical treatment — hCG after 2–3 days, then every 3–4 days until normalization.

Forecast:
With timely diagnosis and treatment, the prognosis is favorable: survival rate — 99.9%. However, fertility may be affected:

• After salpingectomy — the chance of conceiving naturally decreases by 30–40%;
• After salpingostomy — 60–70% of women become pregnant within 2 years;
• Recurrent ectopic pregnancy — 10–15% after the first, up to 30% after the second.

Complications:

• Tubal rupture with hemoperitoneum — the most common and dangerous;
• Peritonitis (when blood and tissue enter the abdominal cavity);
• Anemia, shock, DIC syndrome;
• Infertility (especially in cases of bilateral damage or recurrences);
• Psychological consequences — depression, anxiety disorders after pregnancy loss.

Age-related features of the disease

Ectopic pregnancy can occur at any reproductive age, but it progresses differently in different groups.
Adolescents (15–19 years):**
Frequency below average (0.7–0.9%), but risks are higher due to anatomical features: shorter tubes, narrower lumen, weaker peristalsis. Often the first sexual contact occurs without protection — increase in STIs. Diagnosis is made later because girls are embarrassed to seek help, and symptoms are attributed to "bad periods." Treatment is predominantly surgical, as conservative therapy is less effective due to the high proliferative activity of the trophoblast.
Women aged 20–35:**
The peak incidence is between 25–30 years. Here, risk factors dominate: STIs, use of IUDs, IVF. It is often detected at an early stage due to regular check-ups. Salpingostomy with preservation of fertility is possible.
Women over 35:**
The risk of ectopic pregnancy increases to 2.5%. The reason is age-related changes: decreased peristalsis of the tubes, fibrous changes, concomitant endometriosis. Often associated with other pathologies (fibroids, polyps), complicating diagnosis. Treatment is more often salpingectomy, as the desire to have children decreases, and the risk of recurrence increases.
After 40 years:**
Ectopic pregnancy occurs less frequently (0.5–0.7%), but mortality is higher due to concomitant diseases (hypertension, diabetes). Often the diagnosis is made only upon rupture. Important: even with climacteric changes, pregnancy is possible — therefore, a delay in menstruation requires examination.

Is it possible to preserve an ectopic pregnancy?
No. It is physically impossible. The tissue of the tube cannot stretch like the uterus. Even in very rare cases of abdominal pregnancy (when the embryo attaches to the omentum or mesentery) — the risk of maternal death exceeds 90%. Modern medicine does not aim to "preserve" an ectopic pregnancy but is focused on saving the woman's life and preserving her reproductive potential for future pregnancies.
How to distinguish an ectopic pregnancy from a normal one in the early stages?
The key sign is the discrepancy between the hCG level and the ultrasound picture. For example: a delay of 5 weeks, hCG 2500 IU/ml, but in the uterus — only the mucosa, without a fetal egg. Also characteristic are: unilateral pain, "spotting" instead of menstruation, absence of hCG growth over 48 hours (less than 66%). If there are at least two of these signs — urgently see a gynecologist.
How long after treatment can one plan the next pregnancy?
After methotrexate — not earlier than 3 months (for the drug to be completely eliminated and the endometrium to recover). After laparoscopy — in 1–2 months, if there are no complications. Before planning, it is mandatory to have: ultrasound, tests for STIs, consultation with a reproductive specialist. If there are adhesions — laparoscopy may be required to assess the patency of the tubes.
Is it possible to have an ectopic pregnancy while using a condom?
Yes, but extremely rarely. A condom protects against STIs and reduces the risk of pregnancy, but does not guarantee 100% protection against fertilization (breakage, improper use). If pregnancy occurs and the tubes were previously damaged (for example, due to chlamydia), the risk of ectopic remains. Therefore, even with protected sex, a delay in menstruation requires examination.
Can an ectopic pregnancy "move" into the uterus?
No. Implantation occurs only once — at the moment the egg attaches. If it has attached outside the uterus, it will not "move" inside. Sometimes during ultrasound, a cyst or hematoma is mistakenly taken for a uterine pregnancy, but this is not a movement, but a diagnostic error.

Typical mistakes and how to avoid them

• Mistake: "I'll wait, maybe it will go away on its own." — an ectopic pregnancy does not resolve on its own. Even with a "quiet" course, it will grow until rupture. What to do: in case of any delay + pain — take hCG and ultrasound within 24 hours.
• Error: taking antispasmodics without a diagnosis — they relieve pain but mask progression. What to do: do not take painkillers before consulting a doctor if there is suspicion of an ectopic pregnancy.
• Error: ignoring "spotting" as a sign of the start of menstruation — scanty discharge during a delay is one of the main symptoms. What to do: make an appointment with a gynecologist immediately, even if "it's not that serious."
• Error: refusing laparoscopy with an unclear picture — ultrasound is not always reliable. What to do: trust the doctor who offers diagnostic laparoscopy — it saves lives.
• Error: not passing control after treatment — residual tissue can cause a repeat rupture within weeks. What to do: strictly adhere to the hCG and ultrasound monitoring schedule, even if you "feel fine."

Conclusion

Ectopic pregnancy is not an "accident," but a predictable complication that can be detected and stopped at an early stage. The key to success is not panic, but timely consultation and clear adherence to the doctor's recommendations. Today we have all the tools: sensitive hCG tests, high-frequency ultrasound, safe surgical methods, and effective medications like methotrexate. But most importantly, awareness: a delay in menstruation + pain = a reason for an emergency visit, not for self-diagnosis on the internet.
If you or your loved one has faced this situation — remember: it is not your fault, not a punishment, and not a verdict. It is a medical task that professionals solve. Preserving life is the top priority. And the possibility of becoming a mother in the future is real, especially if you act quickly and wisely. Do not be afraid to ask questions, demand explanations, and seek control. Your health is in your hands, and in the hands of those who know how to protect it.