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RUP (Ruptured Uterine Pregnancy)

What is RUP (Ruptured Uterine Pregnancy)?

RUP, or Ruptured Uterine Pregnancy, is a life‑threatening obstetric emergency in which the wall of the uterus tears, allowing the fetus, placenta, and amniotic fluid to escape into the abdominal cavity. The rupture most often occurs in the third trimester, but it can happen earlier if the uterine wall is weakened. When rupture occurs, maternal blood loss can be massive, fetal oxygenation is abruptly lost, and both mother and baby are at immediate risk of death if not treated promptly.

RUP is distinct from an ectopic pregnancy (where implantation occurs outside the uterine cavity) and from a uterine dehiscence (a partial, often asymptomatic, scar separation after a previous cesarean). In RUP the full thickness of the uterine wall is breached, creating a communication between the intra‑uterine space and the peritoneal cavity.

According to the World Health Organization (WHO), uterine rupture accounts for < 1 % of all deliveries in high‑income countries, but the incidence rises dramatically (up to 5 %–10 %) in low‑resource settings where access to surgical care is limited.<sup>WHO</sup>

Common Causes

The uterine wall can become vulnerable for a number of reasons. The most frequent precipitants include:

• Previous cesarean or myomectomy scar – scar tissue is less elastic and can give way under the stress of labor.
• Uterine over‑distension – multiple gestation, polyhydramnios, or large fetal size (macrosomia).
• Inadequate or prolonged labor induction – especially with high‑dose oxytocin or prostaglandins.
• Uterine malformations – such as a bicornuate or septate uterus.
• Trauma – blunt abdominal injury from falls, motor‑vehicle collisions, or direct blows.
• Uterine anomalies from prior surgery – laparoscopic or hysteroscopic procedures that weaken the myometrium.
• Use of uterine “toco” monitors or excessive fundal pressure during delivery.
• Infection or inflammation – e.g., chorioamnionitis that erodes the uterine wall.
• Congenital connective‑tissue disorders – such as Ehlers‑Danlos syndrome, which impair tissue integrity.
• Medications that cause uterine hyperstimulation – misuse of agents like misoprostol.

Associated Symptoms

RUP often presents abruptly and dramatically. Classic features include:

• Sudden, severe abdominal or pelvic pain that does not subside with position changes.
• Fetal distress signs: abnormal heart rate patterns, loss of fetal heart tones.
• Vaginal bleeding – may be heavy or faint, sometimes mixed with clots.
• Palpable fetal parts outside the uterine contour.
• Rapidly falling maternal blood pressure (hypotension) and increased heart rate (tachycardia).
• Signs of shock: cold, clammy skin; dizziness; fainting.
• Abdominal tenderness with guarding or rigidity (peritoneal irritation).
• Decreased urine output (oliguria) due to hypovolemia.
• Maternal anxiety or a sense that “something is terribly wrong.”

When to See a Doctor

Because a uterine rupture can become fatal within minutes, any of the following warrants **immediate medical attention** (call emergency services or go to the nearest hospital with obstetric capability):

• Sudden, intense abdominal or pelvic pain at any gestational age.
• Any vaginal bleeding after the 20th week of pregnancy.
• Fever, chills, or a feeling of “shakiness” accompanied by pain.
• Changes in fetal movement – especially a sudden decrease or stop.
• Rapid heartbeat (> 100 bpm) or a drop in blood pressure (< 90 mm Hg systolic).
• Visible bulging of fetal parts through the abdomen.
• Persistent nausea or vomiting with abdominal pain.

Diagnosis

Prompt diagnosis relies on a combination of clinical evaluation and rapid imaging. Typical steps include:

1. Clinical Assessment

• Vital signs: blood pressure, heart rate, respiratory rate, temperature.
• Focused abdominal exam for tenderness, rigidity, and fetal parts.
• Cardiac monitoring of the fetus (continuous fetal heart rate). Loss of fetal heart tones is an ominous sign.
• Assessment of uterine scar history (number of prior cesareans, type of incision).

2. Laboratory Tests

• Complete blood count (CBC) – to gauge hemoglobin/hematocrit and detect anemia.
• Type and screen for blood transfusion preparation.
• Basic metabolic panel – assesses kidney function and electrolyte status.
• Coagulation profile (PT/INR, aPTT) if massive hemorrhage is suspected.

3. Imaging

• Trans‑abdominal ultrasound – first‑line; may show free fluid in the abdomen, abnormal fetal position, or discontinuity of the uterine wall.
• Trans‑vaginal ultrasound – provides higher resolution of the lower uterine segment and scar.
• Focused Assessment with Sonography for Trauma (FAST) exam – quickly identifies intra‑abdominal bleeding.
• In rare, stable cases, MRI may delineate the exact rupture site, but this is seldom used emergently.

4. Surgical Exploration

If imaging and clinical signs strongly suggest rupture, the definitive diagnosis is made during laparotomy (or rarely, laparoscopic) when the uterine defect is visualized.

Treatment Options

Uterine rupture is a surgical emergency. Management focuses on rapid maternal stabilization, delivery of the fetus, and repair (or removal) of the uterus.

Immediate Stabilization

• Establish two large‑bore intravenous (IV) lines; begin rapid infusion of crystalloids (e.g., normal saline) and prepare for blood products.
• Administer supplemental oxygen (10–15 L/min) via face mask.
• Continuous cardiac monitoring for both mother and fetus.
• Prepare for massive transfusion protocol if hemorrhage > 1,500 mL is anticipated.

Surgical Management

1. Emergency laparotomy – most common approach. The obstetrician makes a vertical midline incision to access the uterus.
2. Delivery of the fetus – usually by breech extraction or classical (vertical) uterine incision. If the baby is still viable, neonatal resuscitation is initiated immediately.
3. Uterine repair – If the rupture is limited and the uterus is otherwise healthy, the surgeon may close the defect in two layers using absorbable sutures.
4. Hysterectomy – Required when the rupture is extensive, the uterus is severely damaged, or bleeding cannot be controlled.
5. Adjuncts – Uterine artery ligation, Bakri balloon tamponade, or packing may be employed to control bleeding before definitive repair.

Post‑operative Care

• Intensive care unit (ICU) monitoring for at least 24 hours.
• Continued blood product administration as needed.
• Broad‑spectrum antibiotics to prevent infection.
• Thromboprophylaxis (e.g., low‑molecular‑weight heparin) once bleeding is controlled.
• Psychological support and counseling regarding future fertility.

Conservative / “Home” Measures

There are no home‑based treatments for an acute rupture. However, for women with a known high‑risk scar who are currently pregnant, the following preventive measures can reduce the chance of rupture:

• Scheduled repeat cesarean delivery before the onset of labor (usually at 36‑38 weeks).
• Strict adherence to prenatal appointments for monitoring scar thickness by ultrasound.
• Avoidance of labor‑inducing agents unless absolutely necessary.
• Immediate reporting of any new abdominal pain, bleeding, or change in fetal movement.

Prevention Tips

While not all ruptures are preventable, risk can be minimized with careful obstetric care:

• Optimal prenatal care: Early identification of uterine scar thickness (via trans‑vaginal ultrasound) and counseling on delivery mode.
• Planned delivery: Elective repeat cesarean section for women with a classical, vertical, or multiple low‑segment scars.
• Controlled labor induction: Use the lowest effective dose of oxytocin, and monitor uterine activity continuously.
• Limit uterine over‑distension: Management of polyhydramnios (e.g., therapeutic amnioreduction) and close monitoring of twin pregnancies.
• Educate patients on warning signs: Provide written material on when to call emergency services.
• Address modifiable risk factors: Treat infections promptly, avoid illicit drug use, and manage chronic hypertension or diabetes.
• Safe obstetric surgery: When myomectomy or other uterine surgery is required, use techniques that preserve myometrial integrity.
• Trauma prevention: Use seat belts correctly, avoid high‑impact sports in late pregnancy, and seek early care after any abdominal blow.

Emergency Warning Signs

Key Take‑aways

• Ruptured uterine pregnancy is a rare but catastrophic obstetric emergency that demands rapid recognition and surgical intervention.
• Previous uterine surgery (especially cesarean sections) is the strongest risk factor; careful scar assessment and scheduled delivery are crucial.
• Typical presenting symptoms are sudden, intense abdominal pain, vaginal bleeding, and signs of maternal shock.
• Diagnosis relies on clinical suspicion, bedside ultrasound, and, ultimately, surgical exploration.
• Definitive treatment is emergency laparotomy with delivery of the fetus and repair or hysterectomy of the uterus.
• Prevention focuses on vigilant prenatal care, avoidance of unnecessary labor induction, and patient education about warning signs.

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References:

1. Mayo Clinic. “Uterine rupture.” https://www.mayoclinic.org
2. World Health Organization. “Uterine rupture.” WHO Reproductive Health Library, 2022. https://www.who.int
3. Cleveland Clinic. “Uterine Rupture During Pregnancy.” 2023. https://my.clevelandclinic.org
4. American College of Obstetricians and Gynecologists (ACOG). “Practice Bulletin No. 184: Management of Delivery After a Previous Cesarean Birth.” 2020.
5. National Institutes of Health, National Library of Medicine. “Uterine rupture.” MedlinePlus, 2022. https://medlineplus.gov

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