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Concept
Uterine rupture
Summary
Uterine rupture is when the muscular wall of the uterus tears during pregnancy or childbirth. Symptoms, while classically including increased pain, vaginal bleeding, or a change in contractions, are not always present. Disability or death of the mother or baby may result.
Risk factors include vaginal birth after cesarean section (VBAC), other uterine scars, obstructed labor, induction of labor, trauma, and cocaine use. While typically rupture occurs during labor it may occasionally happen earlier in pregnancy. Diagnosis may be suspected based on a rapid drop in the baby's heart rate during labor. Uterine dehiscence is a less severe condition in which there is only incomplete separation of the old scar.
Treatment involves rapid surgery to control bleeding and delivery of the baby. A hysterectomy may be required to control the bleeding. Blood transfusions may be given to replace blood loss. Women who have had a prior rupture are generally recommended to have C-sections in subsequent pregnancies.
Rates of uterine rupture during vaginal birth following one previous C-section, done by the typical technique, are estimated at 0.9%. Rates are greater among those who have had multiple prior C-sections or an atypical type of C-section. In those who do have uterine scarring, the risk during a vaginal birth is about 1 per 12,000. Risk of death of the baby is about 6%. Those in the developing world appear to be affected more often and have worse outcomes.
Symptoms of a rupture may be initially quite subtle. An old cesarean scar may undergo dehiscence; with further labor the woman may experience abdominal pain and vaginal bleeding, though these signs are difficult to distinguish from normal labor. Often a deterioration of the fetal heart rate is a leading sign, but the cardinal sign of uterine rupture is loss of fetal station on manual vaginal exam. Intra-abdominal bleeding can lead to hypovolemic shock and death. Although the associated maternal mortality is now less than one percent, the fetal mortality rate is between two and six percent when rupture occurs in the hospital.
Official source
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