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Incomplete Abortion – Causes, Symptoms & Treatment

Incomplete abortion refers to a miscarriage in which parts of the pregnancy tissue remain in the uterus, requiring medical treatment to prevent complications.

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Things worth knowing about "Incomplete Abortion"

Incomplete abortion refers to a miscarriage in which parts of the pregnancy tissue remain in the uterus, requiring medical treatment to prevent complications.

What Is an Incomplete Abortion?

An incomplete abortion (Latin: abortus incompletus) is a type of miscarriage in which the pregnancy has ended but not all of the pregnancy tissue – such as the embryo, placenta, or fetal membranes – has been fully expelled from the uterus. Retained tissue can lead to serious complications including infection, prolonged or heavy bleeding, and, in severe cases, sepsis. Medical treatment is therefore usually required.

Causes

An incomplete abortion most commonly occurs as a result of a spontaneous miscarriage. The underlying causes of the miscarriage itself may include:

Chromosomal abnormalities in the embryo (the most common cause in the first trimester)
Hormonal imbalances, such as luteal phase deficiency
Structural abnormalities of the uterus (e.g., uterine septum)
Maternal infections
Blood clotting disorders or thrombophilia
Significant physical or emotional stress

In many cases, no specific cause can be identified.

Symptoms

Common signs and symptoms of an incomplete abortion include:

Persistent or heavy vaginal bleeding that may continue for several days
Cramping lower abdominal pain
Passage of tissue fragments or blood clots
An open cervical os, detected during pelvic examination
In complicated cases: signs of infection such as fever, chills, and foul-smelling discharge

Diagnosis

Diagnosis is typically confirmed through the following assessments:

Transvaginal ultrasound: Identifies retained pregnancy tissue within the uterine cavity
Pelvic examination: Evaluates the cervix and extent of bleeding
Blood tests: Including serum beta-hCG levels, complete blood count, and inflammatory markers to assess blood loss and detect infection

Treatment

Treatment depends on the clinical condition of the patient, the amount of retained tissue, and whether complications such as infection or severe bleeding are present. The three main treatment approaches are:

Expectant Management

In stable patients without signs of infection, a watch-and-wait approach may be taken to allow the remaining tissue to pass naturally. This requires close medical follow-up and monitoring.

Medical Treatment

The medication misoprostol, a prostaglandin analogue, can be administered to stimulate uterine contractions and help expel retained tissue. This option is particularly appropriate in the absence of active infection.

Surgical Treatment (Uterine Evacuation)

If bleeding is heavy, if signs of infection are present, or if medical management has been unsuccessful, surgical evacuation of the uterus is performed. This may be done via vacuum aspiration (suction curettage) or sharp curettage, typically under short general anesthesia.

Aftercare and Psychological Support

Follow-up examinations after treatment are essential to confirm complete evacuation of the uterus. The emotional impact of pregnancy loss should not be underestimated. Psychological counseling or support groups can provide meaningful help to affected individuals and their partners during the grieving process.

References

World Health Organization (WHO): Safe Abortion – Technical and Policy Guidance for Health Systems, 2nd edition (2012).
American College of Obstetricians and Gynecologists (ACOG): Early Pregnancy Loss – Practice Bulletin No. 200 (2018).
Regan L., Rai R.: Epidemiology and the medical causes of miscarriage. Best Practice & Research: Clinical Obstetrics and Gynaecology, 2000; 14(5): 839–854.

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